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Date: 23 Sep 2007 02:05:58
From: canopus56
Subject: Pleiades M45 asterism name for trail of 6 or 7 stars?
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Is there an asterism or informal name for the six or seven stars that
trail south from Alcyone in the Pleiades (M45). See -
http://antwrp.gsfc.nasa.gov/apod/ap060109.html
Thanks - Canopus56
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Date: 24 Sep 2007 01:53:52
From: das namen ist-
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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note the faint diffraction spectra along each spike - neat!
Reflection neb? Ha Region? SciFi Channel going to play a
real scifi movie in the next five years? Doubtful.
canopus56 wrote:
> Is there an asterism or informal name for the six or seven stars that
> trail south from Alcyone in the Pleiades (M45). See -
>
> http://antwrp.gsfc.nasa.gov/apod/ap060109.html
>
> Thanks - Canopus56
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Date: 23 Sep 2007 19:21:00
From: Esmail
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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canopus56 wrote:
> Is there an asterism or informal name for the six or seven stars that
> trail south from Alcyone in the Pleiades (M45). See -
can't offer an answer, but they are a favorite of mine
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Date: 23 Sep 2007 10:11:15
From:
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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On Sep 23, 3:05 am, canopus56 <canopu...@yahoo.com > wrote:
> Is there an asterism or informal name for the six or seven stars that
> trail south from Alcyone in the Pleiades (M45). See -
>
> http://antwrp.gsfc.nasa.gov/apod/ap060109.html
"Alcyone's Children" sounds like a reasonable name to me; but I don't
recall encountering a name for that asterism in the literature.
Through a telescope "Alcyone's Children" stands out as an asterism
that practically yells out to be recognized as something special. IMO
it's deserving of a name of its own.
Bill Greer
To sketch is to see.
http://cejour.blogspot.com
http://www.rangeweb.net/~sketcher
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Date: 23 Sep 2007 11:39:25
From: Marty
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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Canopus56 was wondering
>Is there an asterism or informal name for
> the six or seven stars that trail south
> from Alcyone in the Pleiades (M45).
Not that I'm aware of, but they ARE pretty conspicuous when you see 'em.
They evidently jumped out at Galileo...
http://lasp.colorado.edu/~bagenal/1010/images/Galileo.pleiades.gif
and Steve Paul was saying
>I don't know about that, but I'd sure like
> to see a wider field shot of that area
> with that depth of detail.
This doesn't have the depth of detail, but NOTHING looks better than the
Pleiades with a wide field view.
http://cc.joensuu.fi/seulaset/palviainen/pleiades.jpg
I can't take credit for either of these pics, I just happened to be
playing with a google image search for the Pleiades before I came in
here. The world would be a little bit dimmer without the Pleiades...
Marty
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Date: 23 Sep 2007 10:18:41
From: Steve Paul
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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"canopus56" <canopus56@yahoo.com > wrote in message
news:1190538358.337813.102320@g4g2000hsf.googlegroups.com...
> Is there an asterism or informal name for the six or seven stars that
> trail south from Alcyone in the Pleiades (M45). See -
>
> http://antwrp.gsfc.nasa.gov/apod/ap060109.html
>
> Thanks - Canopus56
Well I don't know about that, but I'd sure like to see a wider field shot of
that area with that depth of detail. I was unaware that there was also an
emission nebula in the Pleaides, as possibly indicated by the red area to
the right of that very string of stars.
Interesting...
-Steve P.
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Date: 23 Sep 2007 08:54:53
From: Chris L Peterson
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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On Sun, 23 Sep 2007 10:18:41 -0400, "Steve Paul"
<smarshallpaul@gmail.com > wrote:
>Well I don't know about that, but I'd sure like to see a wider field shot of
>that area with that depth of detail. I was unaware that there was also an
>emission nebula in the Pleaides, as possibly indicated by the red area to
>the right of that very string of stars.
Indeed, there is a large Ha emitting region all around the Pleiades,
which often shows up on deep widefield images of the region. Not really
surprising given the amount of energy being pumped out by these young,
hot stars.
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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Date: 24 Sep 2007 00:52:23
From: David Knisely
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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Chris L. Peterson wrote:
> Indeed, there is a large Ha emitting region all around the Pleiades,
> which often shows up on deep widefield images of the region. Not really
> surprising given the amount of energy being pumped out by these young,
> hot stars.
I don't think that there is any significant H-alpha emitting region in
the immediate vicinity of the Pleiades. The nebulosity the cluster is
enveloped in is largely a reflection nebula, as can be seen from deep
red images where the nebular glow is greatly subdued when compared with
blue-light images. Indeed, color images show the bluish-white color
similar to that of the cluster stars, and the spectrum of the nebula
closely matches the spectra of the brighter stars. It has been
suggested that the cluster is merely moving through an area of
interstellar dust rather than being part of it, as the proper motion and
radial velocity of the cluster and the nebula are not very similar.
Clear skies to you.
--
David W. Knisely KA0CZC@navix.net
Prairie Astronomy Club: http://www.prairieastronomyclub.org
Hyde Memorial Observatory: http://www.hydeobservatory.info/
**********************************************
* Attend the 14th Annual NEBRASKA STAR PARTY *
* July 15th-20th, 2007, Merritt Reservoir *
* http://www.NebraskaStarParty.org *
**********************************************
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Date: 24 Sep 2007 00:25:38
From: Chris L Peterson
Subject: Re: Pleiades M45 asterism name for trail of 6 or 7 stars?
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On Mon, 24 Sep 2007 00:52:23 -0500, David Knisely <KA0CZC@navix.net >
wrote:
>I don't think that there is any significant H-alpha emitting region in
>the immediate vicinity of the Pleiades. The nebulosity the cluster is
>enveloped in is largely a reflection nebula...
Of course, the Pleiades is primarily a reflection nebula. But it is
young enough that it should maintain a small amount of ionized hydrogen,
and certainly, a number of images made in the last few years (as imagers
have gone very deep) show arcs of red around the periphery. I actually
recall a beautiful Ha image that I saw maybe a year ago, but don't
recall the imager, that showed only the faint outer nebulosity.
If it isn't Ha emission, do you have another explanation for the red
that shows up in deep images? (I'm not talking about the reddish hues
sometimes seen around the bright stars, which is presumably caused by
scatter.)
_________________________________________________
Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
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