Jupiter And Venus Cozy Up For Year’s Best Conjunction

The sky’s two brightest planets, Jupiter and Venus, will approach with 0.3 degrees of each other in morning twilight on Monday August 18th, the closest conjunction of the pair visible over North America since April 1998. This view faces northeast about 40 minutes before sunrise. Stellarium

As Mars approaches Saturn at dusk, Jupiter and Venus are zeroing in on each other at dawn for a spectacular close conjunction Monday morning August 18th. You won’t want to miss this one.

Conjunctions of the two brightest planets occur about once every 13 months but vary in visibility (some happen in daylight) and separation. The closer they get, the more arresting the view.

Tomorrow morning the planets will be a little more than 1º (two full moon diameters apart) – righteously close. But Monday morning they’ll be three times closer, just 0.3º  apart or a tad more than a half moon. That’s cozy enough for both to comfortably fit in the same field of view of a telescope.

Want to watch the approach? This view shows the sky tomorrow morning Sunday August 17th about 45 minutes before sunrise facing northeast. Venus will be about a degree above Jupiter and shine six times brighter.  Stellarium

To watch the event, find a place with a wide-open view to the east as far down to the horizon as possible.

Both planets will about 8º high or just shy of a fist held at arm’s length 40-45 minutes before sunrise.

Bring your camera too! A mobile phone might do OK in twilight, otherwise set your camera’s ISO to 400, place it on a tripod and open the lens to f/4 or 4.5. Then in auto mode, focus your lens at infinity by pointing it at the moon or a cloud. Now click your lens back into manual focus mode and point it at the planets, making a series of exposures from 1 second to 10 seconds. Check the camera back to make sure you’re in the ballpark on both sharpness and exposure.

Jupiter (top) and Venus in a more distant conjunction on June 30, 2012 seen over Lake Superior in Duluth, Minn. Credit: Bob King

Close as Jupiter and Venus will be for North America, skywatchers in central Europe will see them even closer (0.2º) before sunrise. After Monday, Jupiter continues its swift rise in the eastern sky while Venus slowly sinks toward the sun. They won’t pair up again until June 30, 2015 when they’ll be just as close in evening twilight in the constellation Leo.

Venus and Jupiter will pair up right next door to the Beehive Cluster in Cancer Monday August 18th at dawn. This shows an approximate binocular view. Stellarium

One final and happy note. Not only are the planets pairing up, they also happen to be right next to the Beehive star cluster in the constellation Cancer the Crab. I think you’ll need binoculars to see the cluster clearly, so be sure to have a pair along.

It should be a fun morning. The only down side is that it’s a Monday, meaning you’ll need a nap by the afternoon.

5 Responses

  1. First of all, love your blog. Another tip for trying to photograph the event…..On long exposures disable the image stabilization if using a DSLR with a lens equiped with that feature. Otherwise the IS system may induce a motion blur.

    1. astrobob

      Hi Mark,
      Excellent tip! Thanks for sharing it. I often do the same just to be sure there’s no motion blur. I usually don’t both with my wide-angle zoom but will with a telephoto.

  2. Thank you for your information regarding the near appearance of Venus and Jupiter . I happened out early on the morning of August 17, Sunday, driving from San Francisco to Los Angeles.
    Sometime between 6 and 7 am I noted 2 bright planets in the east, just above the horizon, thought 1 Venus and guessed -after much thought-the other Jupiter.
    Am delighted that you confirmed my sighting.
    Such a thrill to watch the heavens-and especially to have caught, by good chance,
    the spectacular pair.

    1. astrobob

      Hi Judy,
      Good guessing – and glad to be of service. We missed that conjunction here because of clouds. A similar one just as close between Venus and Jupiter will happen again in the evening sky next June.

Comments are closed.