All eyes will be on asteroid 2004 BL86 Monday night

Big boy asteroid 2004 BL86 will pass close enough to Earth tomorrow night (Jan. 26th) to show up in small telescopes. Credit: NASA

January’s been a busy month for skywatchers. Between bright comets, their outbursts and the recent triple shadow transit at Jupiter it’s finally time to catch our collective breath. Maybe hole up in the house and keep warm.

Banish the thought.

Monday night Jan. 26th an obscure asteroid with the moniker 2004 BL86 will make a relatively close pass of Earth, zipping by at 3.1 times the distance of the moon or some 750,000 miles (1.2 million km).

Not a big deal, right? At least once a month a space rock gets this close or closer. Except that this space rock isn’t your typical “tiny house”. 2004 BL86 is 2,230 feet (680 meters) across – more like a space mountain – and big enough and close enough to be easily visible in a small telescope. Even even a Wal-Mart scope will show it. No exaggeration.

This graphic shows the path of asteroid 2004 BL86 with its position shown for Jan. 19th. Closest approach to Earth occurs around 10 a.m (CST) Jan. 26th. The asteroid will fade after Monday but continue to be visible in modest amateur telescopes through about Jan. 29th. Click to see an animation. Credit: NASA/JPL-Caltech

At magnitude +9 under a dark sky the asteroid would be faintly visible with a pair of 10×50 binoculars, but the half moon will be out, so you’ll need a 3-inch or larger scope binoculars in the 15×70 range to spot it. The good news is that the object remains close to 9th magnitude from 6 p.m. to midnight (CST) with peak brightness around 10 p.m.

Discovered 11 years ago, hence the “2004″ prefix, 2004 BL86 is the largest asteroid to pass closest to Earth until 2027 when 1999 AN10 will beat it by coming within one lunar distance. This will also be the asteroid’s closest approach to our planet for at least the next two hundred years, so if you want to see it before you’re six feet under, now’s the time to put on a coat and toddle out the scope.

Map showing the hourly progress of 2004 BL86 Monday evening January 26th as crosses Cancer the Crab not far from Jupiter. Stars are shown to magnitude +9. Numbers at the tick marks show the time (CST) each hour starting at 6 p.m., then 7 p.m., 8 p.m. and so on. Click for a larger version. Created with Chris Marriott’s SkyMap program

All asteroids with well-determined orbits receive a number designation. The very first asteroid discovered, Ceres in 1801, got the #1 spot. Asteroid 13,683 Monty Python (no kidding) was discovered in August 1967. Our featured space mountain numbers 357,439 making its full designation 357439 (2004 BL86). If you’re looking for a new password, this is it.

Black stars-on-white version of the map above which you might find more useful. Click to see and download a large version.

OK, so let’s talk how to see this speeding “star”. Observers in the Americas, Europe and Africa will have the best seats when the asteroid shines brightest between 7 p.m. and midnight (CST) Monday night from a comfortably high perch in Cancer the Crab not far from the planet Jupiter.

Because 2004 BL86 will be near Earth it will be zipping along at the rate of about 2° or four moon diameters per hour. That means you’ll need to use detailed maps to find and track the asteroid as it moves in real time.

Notice that the 2004 BL86 passes near a couple relatively bright stars and even skirts the edge of the bright Beehive star cluster, also known as M44. These are good places to “lie in wait” for the object to move into the field of view. I usually pick a spot some minutes ahead of where the asteroid will be and familiarize myself with the star field. That way, when it arrives, it really stands out. Remember, you’ll be looking for a star-like object slowly crossing the field of view. In reality, it’s sailing by Earth at around 35,000 mph.

Detailed map showing stars down to magnitude +9.5. Click to see and print out a larger version. Created with Chris Marriott’s SkyMap software

Another thing to remember is that near-Earth asteroids will sometimes be a little bit off a particular track depending on your location. Not much but enough that I recommend you scan not just the single spot where you expect to see it but also nearby in the field of view. Just look for a “star” not plotted on the map and keep an eye on it for movement.

Once you nab your prey, follow it for 10, 15 or 30 minutes. It makes for good sport to watch it brush by stars along its path. The closer it comes to a star the more dramatic its apparent motion appears. You should also watch for changes in its brightness as the asteroid rotates. Depending upon shape and rotation rate (unknown at this point) asteroids can show large enough brightness variations to be seen visually at the telescope.

Radar images like these made of asteroid 2007 PA8 will also be made during 2004 BL86′s flyby. Click to enlarge. Credit: NASA/JPL-Caltech

You won’t be the only one watching. Astronomers plan to use NASA’s Deep Space Network antenna at Goldstone, California and the Arecibo Observatory in Puerto Rico to ping the asteroid with microwaves to generate images of it during the time around its closest approach. We hope to share those pictures as soon as they’re available.

As always, Dr. Gianluca Masi, Italian astrophysicist, will stream live coverage of the event beginning at 1:30 p.m. (19:30 UT) Monday.

Triple shadow transit makes for triple the fun

Will Gator shot this excellent series of Jupiter portraits during different phases of the triple shadow transit last night and this morning with an 8-inch telescope. North is up and east to the left. In “D”, the top “dot” on the left side is the moon Callisto. The others are the shadows of (l-r) Europa, Callisto and Io. Credit: Will Gator

I had to dog last night’s triple shadow transit to see it but I’m glad I did. We had clouds nearly the entire time. But even with a crummy sky, Jupiter was bright enough to push through the ceiling at key times during the event.

Through the scope the planet drew a sharp profile with nice cloud belt detail. It was really fun to watch Io’s shadow catch up with and merge with Callisto’s shadow and then separate (panel C above). For a while the two looked like an headless ant or “negative double star”. Even more amazing was seeing the moon Io overlap Callisto’s shadow at 12:20 a.m.

For just a few minutes, Callisto’s black shadow turned a pale orange-gray, obviously lighter in tone than the neighboring shadow of Io. It simply looked wrong! Three minutes later Callisto returned as the biggest and most dominant shadow. Never seen anything like it.

When Europa squeezed onto the Jupiter’s disk at around 12:30 a.m. the show moved into high gear. It took a bit of concentration to see Europa as it casts the smallest shadow of the four Galilean moons. Just to its south, along the southern edge of the South Equatorial Belt, I could easily make out the moon Callisto. I managed about seven minutes of triple shadow viewing before the clouds became impenetrable.

After packing all the equipment away, I happily sat down and shared a glass of wine with my wife. Hope we’re all still around for 2032 when the next trifecta takes place.

Rare comet-moon conjunction tonight

Tonight (Friday, Jan. 23rd) the moon will pass only about 1°  (two moon diameters) south of Comet 15P/Finlay as seen from the Americas. This map shows the view from the upper Midwest at 7 p.m. Two 6th magnitude stars in Pisces are labelled. Created with Chris Marriott’s SkyMap software

I want to alert you to a rather unusual event occurring this evening.

If you read yesterday’s blog, you know about the triple shadow transit of Jupiter’s moons Io, Europa and Callisto. That’s scheduled for late tonight.

Earlier, around nightfall, the crescent moon will lie 1° or less to the south-southwest of comet 15P/Finlay. No doubt lunar glare will hamper the view some, but what a fun opportunity to use the moon to find a comet.

The farther south you live, the closer the moon will approach the comet tonight. This diagram shows the view from Tucson, Ariz. at nightfall when less than 1/2° will separate the two. At about the same time (~7 p.m. local time) the moon will occult or cover up a 6th magnitude star (seen poking out from its left side). Source: SkyMap

Finlay underwent a flare in brightness last week when it became easily visible in binoculars.

Though a crescent moon isn’t what you’d call a glare bomb, I can’t predict for certain whether you’ll still see the comet in binoculars tonight or need a small telescope instead. Most likely a scope. Finlay has faded some since its outburst and now glows around magnitude +8.5.

You can try with a 10×50 or larger glass, and if you don’t succeed, whip out your telescope; a 4.5-inch or larger instrument should handle the job. Just point it at the moon at star-hop a little to the north-northeast using the map until you see a fuzzy spot with a brighter center. That’s your comet. The tail won’t be visible unless you’re using more firepower, something closer to 10-inches.

Comet Finlay in outburst on January 20, 2015 showing a beautiful parabolic-shaped head. Credit: Joseph Brimacombe

By the way, the father south you live, the closer the moon approaches Finlay. From the far southern U.S. they’ll be just 1/2° apart. Keep going south and parts of Central and South America will actually see the earth-lit edge of moon approach and then occult the comet from view!

* UPDATE: Although light clouds marred the view I had difficulty finding the comet this evening in my 10-inch scope. It’s possible it’s further faded or my conditions weren’t optimal or both. No luck BTW in binoculars.

Guide to Friday’s rare triple moon shadow-blast on Jupiter

Shadow transit of Jupiter’s moon Io captured on January 8th this year. Late this Friday night, Io, Europa and Callisto will cast their shadows simultaneously on the planet in a rare triple shadow transit event. Credit: John Chumack

We’re down for a very rare event this weekend that won’t happen again until December 30, 2032 – at least across the Americas. Between 12:28 – 12:52 a.m. (CST) Saturday morning, Jupiter’s moons Io, Europa and Callisto will simultaneously cast shadows on the planet’s cloud tops. Naturally, you’ll need a telescope to see this but only a modest one. You can follow the entire show in a 4 1/2 inch or larger instrument magnifying around 75x.

As Galileo was the first to note, Jupiter’s four brightest moons – Europa, Io, Callisto and Ganymede – revolve about the planet like a solar system in miniature. Each has its own period of revolution ranging from 1.7 days for innermost Io to 16.7 days for more distant Callisto. The moons periodically pass behind the planet (and temporarily get hidden from view), off to one side where they pass through Jupiter’s shadow in eclipse and in front of the planet.

Simulation of Jupiter around 12:40 a.m. (CST) Saturday, January 24th. Two moons and all three shadows will appear projected against the planet’s pale white equatorial zone.
Created with WinJUPOS

When in front of Jupiter, the moons cast their own shadows on its cloud tops. Through a telescope they look like jet black pinpoints for the smaller satellites (Io, Europa) and small dots for Callisto and Ganymede. Amateur astronomers look forward to watching these black dots move across the Jupiter’s cloud belt in part because we’re watching an eclipse happening on another planet. Imagine if you were there within the shadow looking back toward the Sun. From that perspective the moon would cover the Sun in partial or total eclipse. Cool thought.

So here’s the deal. One shadow transit every so often isn’t unusual, two at the same time is more so and a triple happens on average only once or twice every decade. In a word, don’t miss this opportunity.

If you want to catch all three shadows, you’ve got 24 minutes between 12:28 and 12:52 a.m. (CST) Saturday morning January 24th. Before and after that slot, you’ll see the shadows of one or two of the moons but not all three. Below is a list of the CST times, with Universal or UT times in parentheses) when each shadow enters and exits the planet’s face. To convert to your time zone, add an hour for Eastern time, subtract an hour for Mountain and 2 hours for Pacific.

Friday night Jan. 23 – Saturday morning Jan. 24:

* Callisto’s shadow enters disk – 9:11 p.m. (3:11 UT)
* Io’s shadow enters disk – 10:35 p.m. (4:35 UT)
* Europa’s shadow enters the disk – 12:28 a.m. (6:28 UT)
** TRIPLE TRANSIT from 12:28 – 12:52 a.m. (6:28 – 6:52 UT)
* Io’s shadow leaves disk – 12:52 a.m. (6:52 UT)
* Callisto’s shadow leaves disk – 2:00 a.m. (8:00 UT)
* Europa’s shadow leaves disk – 3:22 a.m. (9:22 UT)

Jupiter at 11:52 p.m. (CST) Friday night when Io and Callisto’s shadows will appear to merge. Meanwhile, Io undergoes a partial eclipse in the shadow “beam” cast by Callisto. Source: WinJUPOS

This triple event is unique enough, but there’s even more happening in what I like to call the “pre-game show”. As each moon enters the planet’s face like actors in a play, their shadows will cross over and bump into one another. I’ve included diagrams showing what to expect. For more details on the triple play and special events leading up to it I hope you won’t mind clicking over to this article I wrote for Sky and Telescope online.

The pre-game show wraps up with the moon Io transiting over Callisto’s shadow around 12:20 a.m. CST. The change in the shadow’s appearance should be obvious to the eye. Source: WinJUPOS

Since it was overcast here for the last triple shadow transit in October 11-12, 2013 you can imagine how much I’d like to see clear skies this time around. 2032′s a long, long ways out.

Snake-tongued Comet Lovejoy slithers north, slowly fades

Right now Comet Lovejoy’s faint, double-rayed gas tail extends many degrees to the east of the bright coma. Observers using 10×50 and similar binoculars have traced it out to 10° or more. This photo was taken on Jan. 18th. Credit: Chris Schur

Forked tongues allow snakes to smell in stereo – each fork senses slightly different chemicals in the snake’s vicinity and feeds a separate signal to its brain. When combined, they create a complete “picture” of the reptile’s odiferous world. In much the same way, the two ears on opposite sides of our heard allow us to hear the world in rich stereo sound.

Comet Lovejoy’s nucleus is jetting gas and dust just like Comet 67P/Churyumov-Gerasimenko in this photo taken by the Rosetta spacecraft on November 22, 2014 from a distance of 18.6 miles (30 km). The nucleus is deliberately overexposed in order to reveal the faint jets of activity. Credits: A/Rosetta/MPS for OSIRIS Team MPS/UPD/LAM/IAA/SSO/INTA/UPM/DASP/IDA

Lovejoy’s forked tail is hardly an operative organ, but it’s sure amazing sight for stereo eyes. Composed principally of carbon monoxide gas, each of the two primary rays is incredibly well-defined. Gases like water vapor, carbon monoxide and carbon dioxide boil off the nucleus as the Sun warms the comet and help create its big blue-green head or coma. As described here before, the solar wind ionizes or electrifies the gases which allows the magnetic fields embedded in the wind to peel back the gases to form a the glowing gas or ion tail.

Comet Lovejoy arcs up into Triangulum the Triangle later this week and continues into Andromeda into Cassiopeia. Northern hemisphere observers are favored, while those in the southern hemisphere will soon see the comet drop below their horizon. This chart shows Lovejoy’s position every 5 days around 7 p.m. (CST). Stars to magnitude +6. Click to enlarge. Created with Chris Marriott’s SkyMap software

I hope you’ve had the chance to see Comet Lovejoy. While the naked eye view isn’t impressive (though always a pleasure to behold any comet without optical aid), binoculars clearly show the faint, smoky tail extending east of the fuzzy head. In a telescope, even a fairly large one like the 15-inch (37-cm) reflector I use, the fainter rays are indistinct, though the forked tongue shows a little more clearly.

With the moon now returning to the evening sky (see below) and the comet starting to fade, it will gradually become more difficult to see with the naked eye. By mid-February, Lovejoy will probably have dimmed to the naked eye limit of around magnitude +6. But if you use binoculars, you’ll be able to follow our feathery friend through full moon and beyond.

The returning thin crescent moon gathers with brilliant Venus and fading Mercury low in the west-southwest sky during twilight this evening January 21st. This map shows the sky about 40-50 minutes after sunset. Stellarium

Northern skywatchers are fortunate that the comet continues to move north and ever higher in the sky. By late February it will be circumpolar from many locations and remain visible all night.

You can use the map to help you find Lovejoy as it climbs into Triangulum the Triangle this weekend and from there to Andromeda and Cassiopeia.

Mystery white spot revealed in Dawn’s new photos of Ceres

The Dawn spacecraft observed Ceres for an hour on Jan. 13, 2015, from a distance of 238,000 miles (383,000 km). A little more than half of its surface was observed at a resolution of 27 pixels. This animation, comprised of still images, shows bright and dark features and hints of craters. Ceres rotates once every 9 hours. Credit: NASA/JPL-Caltech/UCLA/MPS/DLR/IDA/PSI

Only 27 pixels across and yet this new image of Ceres by the Dawn spacecraft is nearly as sharp as those taken by the Hubble Space Telescope. To my eye it shows even more detail, possibly because the animation accentuates the changing shades of light so clearly, revealing the asteroid in three dimensions.

Besides uneven, possibly cratered terrain, what stands out is that bright, white spot. It’s also visible in the photos taken by the Hubble Space Telescope (below). Scientists aren’t sure yet what it is, but it may be water ice lining a crater floor. Interesting, eh?

Ceres, the largest asteroid (and also a dwarf planet) resides in the main asteroid belt between Mars and Jupiter. Here it’s compared to Mars, Mercury, the moon and Vesta, Dawn’s first target. Ceres is 590 miles (950 km) across and contains 30% of the mass of the entire main belt.  Credit: NASA

“Already, the (latest) images hint at the first surface structures such as craters,” said Andreas Nathues, lead investigator for the framing camera team at the Max Planck Institute for Solar System Research in Gottingen, Germany.

Hubble photos of Ceres taken in 2003-04 are slightly sharper – for now – than those from Dawn. Credit: NASA/ESA

These latest photos are just the first in a series that are taken for navigation purposes to refine the location of the asteroid and make sure Dawn spirals in accurately on its target. On March 6th, the probe will be captured by Ceres’ gravity; once in its embrace, Dawn will study this virtually unknown world-let for 16 months.

In this image, taken January 13, 2015, the Dawn spacecraft’s visible and infrared mapping spectrometer (VIR) captures dwarf planet Ceres in both visible and infrared light. The infrared image (right) serves as a temperature map of Ceres, where white is warmer and red is colder. Credit: NASA

We won’t have to wait long for even better photos - Dawn’s images will surpass Hubble’s resolution at the next imaging opportunity, which will be at the end of this month.

Single frame of Ceres taken by Dawn shows what appear to be the outlines of craters. Credit: NASA

Ceres is thought to have a rocky core overlain by an mantle of water ice and may even harbor a subsurface ocean. It’s the largest body between the Sun and Pluto that a spacecraft has not yet visited. Because it contains ice, Ceres is believed to have formed far from the Sun. Radioactive elements in minerals that went into building the asteroid helped to heat and partially melt its interior. Insulated by an icy crust estimated at more than 60 miles (100 km) thick, liquid water may yet lurk beneath its hard rind.

 

Mars has close brush with Neptune tonight

Binocular view (~5 field) of Mars, Neptune and nearby stars this evening. The planets will be very close together – only one-fifth of a full moon diameter apart. Mars is bright, but Neptune will look like a faint star to the planet’s upper right. Stars shown to magnitude +8.5. Source: Stellarium

Mars has been hiding away in Aquarius low in the southwestern sky at dusk minding its own business. But tonight however the Red Planet will pass VERY close to another more distant planet, Neptune.

To find Mars you’ll need an open view to the southwest. This map shows the sky facing southwest at the end of evening twilight. Mars is about 12-15° above the horizon at that time. Diphda is a fairly bright star in the constellation Cetus the Sea Monster. Source: Stellarium

You can see the “double planet” faintly in 10×50 or larger binoculars but a small telescope will make it a snap. The chart shows a binocular view just the way you’d see the scene facing southwest at nightfall with north toward the upper right. The best time to view the conjunction will be at the end of twilight when they’re highest.

Track of Mars in the next few days as it glides by the planet Neptune. This is also a 5° field of view similar to what you’d see in a pair of binoculars. Created with Chris Marriott’s SkyMap software

Also in your binocular view you’ll see the stars Sigma and 58 Aquarii. Neptune will look exactly like a star and surprisingly close to Mars.

NASA to ESA: We found your dog!

NASA’s HiRise camera on the Mars Reconnaissance Orbiter detected the glint (top) of the Beagle 2 in photos taken last year and released this week. The lander appears to have at least partially deployed. Credit: NASA

Ruff-ruff! The long-lost Beagle 2 lander has been found. Wish I could say it’s still wagging its tail, but at least we finally know where it is after 11 years of wondering.

Built by the Brits and sent to the Red Planet aboard the European Space Agency’s Mars Express spacecraft in June 2003, it was set to land on Christmas Day that year. Everything worked flawlessly, with the first radio contact expected shortly after the scheduled landing time, but no signal was received. Then or ever.

The Beagle 2 lander, named after HMS Beagle, the ship that carried Charles Darwin on expeditions around the world, looks something like a pocket watch before deployment. Upon landing, the watch top (right) snapped open and the individual panels unfolded from the bottom of the lander. Credit: ESA

Beagle was the first British and European attempt to soft land on Mars. All attempts to contact the probe failed, leading some to believe that the Beagle 2 had crash landed. Later, it was determined that an error had prevented two of the spacecraft’s four solar panels from deploying, blocking the spacecraft’s ability to communicate.

Michael Croon of Trier, Germany, a former member of the European Space Agency’s Mars Express operations team pored over images taken by NASA’s Mars Reconnaissance Orbiter (MRO), which operates a high-resolution camera capable of seeing objects the size of a kitchen table on Mars, and found evidence for the Beagle 2.


This photo shows where features seen in a 2014 observation by NASA’s Mars Reconnaissance Orbiter have been interpreted as hardware from the Dec. 25, 2003, arrival at Mars of the United Kingdom’s Beagle 2 Lander. The scale bar at right shows 0.1 km or a distance of 328 feet. Click to enlarge.

NASA then directed MRO to re-photograph the expected landing location in Isidis Planitia, a large, ancient impact basin near the Martian equator. Analysis of those images revealed a bright object that appeared in multiple pictures taken at different times, ruling out the possibility it was a cosmic ray hit on the camera’s sensor. Cosmic rays, high-speed particles (mostly single protons) careen through space all the time. When they hit a camera sensor they can leave bright streaks or spots.

Two images taken months apart, with the sun at different angles, are merged in this view. A glint comes from a different part of the lander in one than in the other, interpreted as evidence of more than one deployed panel on the lander. Credit: HiRISE/NASA/JPL/Parker/Leicester

Due to the small size of Beagle 2 (less than 7 feet, or 2 meters across for the deployed lander) it’s right at the limit of detection of HiRISE, but enhanced photos clearly show what appear to be the solar panels. That means the lander made it safely to surface after all and even partially deployed.

It’s a shame we weren’t able to establish communications. Beagle 2 was equipped with a pair of stereo cameras, a microscope and a drill to collect rock samples that could be analyzed on site.

Simulation of Beagle 2 on Mars showing the instrument-studded robotic arm and the “mole” (at left). Credit: NASA

It even carried a small “mole” or Planetary Undersurface Tool (PLUTO) that could move across the surface at just under an inch per second. When a suitable spot was found, the mole would have burrowed into the ground to collect a sample. Finished with its task, the mole and its sample would have been reeled back to the lander on its power cable. Gods, what a cool idea!

“I can imagine the sense of closure that the Beagle 2 team must feel,” said Richard Zurek of JPL, project scientist now for Mars Reconnaissance Orbiter (MRO).

Even if our best plans go awry, there’s nothing like closure to help us move on to the next opportunity.

Quick, grab your binoculars, Comet Finlay’s erupted again!

Despite poor conditions, Belgian amateur astronomer Alfons Diepvens got this nice shot of Comet Finlay in outburst on January 17th through his 8-inch (20cm) refractor. Credit: Alfons Diepvens

Quiet Comet Finlay, simmering low in the southwestern sky, has just tossed us a surprise. Two nights ago it experienced a bright eruption and rocketed in brightness. Climbing from a modest magnitude +10 it’s now around 7 and easily visible in 10×50 binoculars.

One of the first people to report the outburst was amateur astronomer Michael Mattiazzo of Australia. He used a telescope in New Mexico via his computer to photograph Finlay on Friday. Lo and behold, a much brighter comet than previous appeared in his time exposures.

Comet Finlay with bright head and a faint, half-degree-long tail photographed on Jan. 16th. Click to see more of Michael’s comet images. Credit: Michael Mattiazzo

Finlay underwent a similar though somewhat fainter outburst last December when it briefly rose above 9th magnitude and became faintly visible in binoculars. This one’s even brighter according to observations trickling in from amateurs around the planet.

Finlay’s a short-period comet that orbits the Sun every 6.5 years. While it hasn’t climbed very high in northern skies this time around, it’s been notable for its flashy behavior. You’ll find the comet about 20-25° high in Aquarius not too far from the planet Mars in the southwestern sky at the end of evening twilight. That’s also the best time to observe it, since the comet only drops lower as the night wears on.

Use this chart to help you find the comet as it treks from Aquarius to Pisces the remainder of this month. At lower right is the planet Mars and next to it, Neptune, shown for tonight. Stars are plotted to magnitude +8 and the map time is 7 p.m. (CST). Click for a large version. Created with Chris Marriott’s SkyMap software

Don’t expect to see a big, bright ball like Comet Lovejoy but do expect a rare chance to see another comet in nothing more than binoculars. Look for a small, round, fuzzy patch with a brighter center, and grab the opportunity as soon as the next clear sky. Outbursts don’t usually last very long.

Comet Finlay will be working its way east through Aquarius into Pisces in the coming nights. There are no particularly bright stars in the area, but you can start with Mars to point you in the right direction. Fortunately, our fuzzy friend is climbing toward the well-known asterism called the Circlet of Pisces familiar to many an amateur and visible easily from a reasonably dark sky.

The cause of the outburst is unclear but probably related to a surface event like the opening of a fissure or crack in the comet’s icy nucleus exposing pristine ices to the Sun’s heat. Rapid vaporization provides more material to reflect sunlight and enhance brightness.

Good luck and clear skies!

Can you feel the Love(joy) tonight? Winter comet now at its best

Comet Q2 Lovejoy sports a faint, blue tail about 5 long while near the Pleiades star cluster last night. The head or coma of the comet is easily visible with the naked eye; the tail shows up in binoculars as a thick, smoky streak pointing to the northeast. The glowing patches in the cluster are caused by cosmic dust reflecting starlight. Details: 200mm telephoto at f/2.8, ISO 800. Credit: Bob King

Darkness came in heaps and lingered for hours last night. Although Comet Q2 Lovejoy competes well with the glare of the city and isn’t hard to see from my driveway, I craved something closer to a classic 18th century, electricity-free sky. That meant putting another 25 miles between me and Duluth.

This photo map will help you find the comet in the next few nights as it passes the Pleiades star cluster. Dates are shown at right from Jan. 11-19. Look high in the southeast at nightfall to spy the dipper-shaped cluster then look about one fist to its right. The comet looks like a dim, slightly fuzzy star of 4th magnitude. Credit: Bob King

From the countryside it was easy to just find the Pleiades or Seven Sisters star cluster and jump from there to the comet. As you can see from the photo map, Lovejoy will be near the cluster the next few nights. There’s still no moon in the sky, so I encourage to go out now for a look if you haven’t already. Even if you’ve seen it once or two, the comet bears watching every clear night. Fluctuations in the solar wind continuously change the shape, length and appearance of the ion or gas tail that’s so outrageously beautiful right now.

Comet Lovejoy time exposure made through an 8-inch (20-cm) telescope on January 14th. Beautiful! Click to immerse yourself. Credit: Gerald Rhemann

To my eyes, Lovejoy looked a little brighter (magnitude +3.8) last night than a week ago when it was closest to Earth. Even in 50mm binoculars you can see the pale blue color of the head or coma. The spectacular tail rays depicted in deep photos are much harder to make out. I could just detect a couple of them faintly in a 15-inch telescope when I moved the bright coma out of the field of view and allowed my eyes to fully dark-adapt. Tapping the telescope to bounce the comet around helped to make them stand out better.

Insane high resolution view of Comet Lovejoy’s ion or gas tail on January 11th. Heat from the Sun is responsible for cooking comet ice, which vaporizes and releases gases and dust to form a tail. UV light from the Sun then ionizes or electrified the gases and the solar wind wraps around the comet and drags them into multiple tail rays. Credit: Damian Peach

We’ve got about another week of dark, moonless skies ideal for comet watching. Perihelion or closest approach to the Sun occurs on January 30th, so Lovejoy’s brightness may remain constant during this time even as it moves farther from Earth.

Did you catch the Saturn-moon conjunction this morning? It was cloudy in Duluth, Minn. but around 7:15 a.m. a few brief holes opened up, showing the pair. Credit: Bob King

While you’re at it, point your binoculars at the nearby Pleiades for a face-full of stars. They’re my favorite in binocular cluster because the group comes alive with far more stars than are visible with the naked eye.

I hope you were able to see the conjunction of Saturn and crescent moon earlier today. I wasn’t able to see it at the optimal time in a dark sky at the start of dawn, but we still got a glimpse here.

On Sunday I’ll include a brand new map for tracking Comet Lovejoy over the next two weeks as it continues its northward climb.