What’s Lovelier Than The Pleiades In September?

The Pleiades star cluster rises between the trees in the northeastern sky on a recent night. The attractive group comes up around 10 p.m. local time and is high in the east around midnight. Photo: Bob King

What’s lovelier on a September night than watching the Pleiades rise in the east? Whether you’re alone or in a group, when the “seven sisters” appear, everyone stops what they’re doing for a minute to admire this most beautiful star cluster. When I’m at a star party, someone inevitably calls out their first appearance like a courier announcing Caesar’s return to Rome. Yes, they’re that big of a deal.

The Pleiades represent the seven daughters of Atlas and Pleione, which are also members of the dipper-shaped cluster. Asterope and Calaeno usually require binoculars to see. Credit: John Lanoue

The name Pleiades (PLEE-uh-deez)  comes from ancient Greek myth. Also called the Seven Sisters Cluster, the stars represent the seven daughters of the titan Atlas and sea-nymph Pleione. The origin of the name is uncertain but may be related to the word plein ( ‘to sail’), since the stars’ conjunction with the sun in spring and rising at sunset in fall marked the beginning and end of the sailing season in ancient Greece. Other possible origins include peleiades (‘flock of doves’) which is consistent with the story of Zeus turning the sisters into doves as they were pursued by Orion.

An interpretation of the Pleiades from a 10th century Anglo-Saxon manuscript called a codex (Codex Vossianus 79).

Being a compact group of bright stars quite unlike any other in the sky, the Pleiades have figured prominently in the sky lore of many cultures. Most people I know refer to the cluster as a “little dipper” or miniature version of the Big Dipper. My eye sees a shopping cart or baby stroller. Here’s just a small sampling of how others have interpreted their appearance:

* Japan – a strainer or dabs of paint on the sky
*  Celtic mythology – associated with a fall festival of the dead since the cluster rose in the east as the sun disappeared in the west in that season
* Maya Indians – a rattlesnake’s tail
* Mono people (Native Americans) of California – Six wives who loved onions more than their husbands and who now live happily in the sky.
*  Babylonians – Mul Mul or “star of stars”
* Maori of New Zealand – “Matariki” or little eyes
* Czech Republic – “Kuratka” or many small, young chickens

It’s their sheer compactness that delights the eye. They’re gathered so close together they seem enveloped in a fuzzy cocoon that further adds to their appeal. Poet Alfred Lord Tennyson said it best in his poem Locksley Hall:

“Many a night from yonder ivied casement, ere I went to rest,
Did I look on great Orion sloping slowly to the West.

Many a night I saw the Pleiads, rising thro’ the mellow shade,
Glitter like a swarm of fire-flies tangled in a silver braid.”

The Pleiades cluster contains about 1000 stars. Its core – what we see with the naked eye – is about 8 light years across or twice the distance to Alpha Centauri. Most of its stars are young, hot and blue. The cloudiness around the stars is starlight reflecting off a dust cloud through which the cluster is currently passing. Credit: NASA

My old friend Roy would recite those famous lines on winter nights observing together from my old suburban Chicago neighborhood. I have many memories of good times with the Pleiades and many associations, too. They’re always a reminder of the coming winter when they sail high across the southern sky. In mid-September the sisters make  their first appearance in the east around 10 o’clock.; by mid-October they’re up at 8.

The Pleiades are exactly what they appear to be – a real, physically connected cluster of stars. They coalesced from a cloud of dust and gas about 100 million years ago smack in the middle between the appearance of the first flowering plants and disappearance of the dinosaurs. Located about 440 light years from the Earth, the light you see tonight left the cluster in the late 1500s, some 30 years before Galileo first pointed his telescope at them. His sketch shows many more stars that you can see with the naked eye alone.

Sketches of the Pleiades by Galileo. Notice the line of stars stretching to the left of the “dipper”.

At a casual glance, you’ll probably see just five or six stars, but if you peer closely, the seventh, Pleione, will materialize. The real fun starts when you avert your vision and look around rather than directly at the cluster. A smattering of faint stars will suddenly pop into view boosting your total to 8, 10, 14??

Give it a try, then beam in on them with binoculars. Whoa! Instead of seven, you’ll see many dozens, including a most attractive stream of stars  shown so well in Galileo’s drawing.

I wish you smooth sailing with the daughters of the night.

17 Responses

  1. Mike

    Good frosty morning to you Bob!

    Please provide the details on your great photo of the 7 sisters, one of my favorite star groups!

    Thanks!

    Hope you are well. Was in DLH on Sat. visiting Hawk Ridge. Things look back to normal from the June flood.

    Take care sir!

    MIke

  2. Mike

    Wow! 6400! Amazing camera to do that with such clarity and no noticeable digital noise.

    Sat the wind was from the wrong direction I was told. Therefore not much was happening at Hawk Ridge. Those that came by were very high and away from the observation area.

    Heavy frost this morning. Low 20’s. Get any in DLH?

    Thank you for sharing Bob!

    Mike

    1. astrobob

      Mike,
      Yes, we got frost here at home. Out in the country last night away from Duluth it got down to 24 degrees. If you could see the original, you’d see some noise. I was pushing it because I wanted as brief an exposure as possible with the telephoto lens, so there’d be almost no trailing. Sorry to hear you got a bad wind. Come back again some time.

  3. Mike

    Is there another location besides Hawk Ridge to observe and do photos? I see photos on their site that talk about other places where birds have been captured and banded.
    Thanks!

    1. astrobob

      Mike,
      There are several other locations within Hawk Ridge along various trails. Birders set up on “balds” there to watch and photograph. Just ask for a trail map. I can tell you a couple other spots once you’ve got a map.

  4. Richard Keen

    In Japanese the Pleiades are known as Subaru – check out the stylized cluster logo on the front grill. It looks likes the Pleiades after several million years of proper motion, with one of the stars going nova.

      1. Richard Keen

        Bob, I have a Subaru, too. I bought mine back in Nov. ’85 just as Halley’s Comet reached naked-eye visibility near – you guessed it – the Pleaides.
        Guess that’s an odd connection.

        1. astrobob

          Richard,
          Do you still have it? That would be amazing if so. And if you do, you must have driven it at least to the moon. And back? I bought a used one mid-2000s.

  5. Richard Keen

    Amazing, I still drive it! Mostly up and down the hill to catch the bus (that low range 4WD is great!), although I used to take lots of western trips in it. Last week it went to Denver for the annual meteorite auction. Only 150k miles, or 0.6 Lunar Distances, as they say in the Near Earth Asteroid business. The car itself is about the size of little 2012 KT42 that winged by us last spring and which you watched setting into the trees.
    Lots of astronomical perspectives on our Subarus.

  6. Richard Keen

    Bob,
    I came in second for some Martian stones, but you know what they say about second place. I did sell a few shatter cones from the Santa Fe impact feature, though.
    The auction is an annual event during the Fall Colorado Mineral & Fossil Show, and is put on by COMETS (COlorado METeorite Societ), a good bunch of fun people. Most of my spare change this week is going towards an eclipse trip, so I mostly went for the fun of having BBQ and beer in the company of a bunch of fellow meteorite freaks. You know a bunch of them, don’t you?

    1. astrobob

      Richard,
      Sounds like you got away before Mars took you for a few pennies. Yes, I do know a few of the COMETS – Anne, Fred, the Jensen brothers and a few others. Did you get to see Robbie (I think that’s his name) from South Africa at the convention center? He had the best Gibeons a few years back – I really should have bought one then before the price climbed.

  7. John

    Nice write up. I don’t get to star gaze as much as I would like. My reason for reading is that I named my 7th daughter Pleiade. Thanks. 🙂

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