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Observing >> Deep Sky Observing

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KidOrion
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Reged: 07/07/07

Loc: Carbondale, IL
New Globular Cluster Discovered new
      #6434464 - 03/28/14 01:55 PM

Not to steal your topic from that other place, Jimi--sorry!

There's a "new" member of the Milky Way's retinue of globular clusters:

Discovery announcement paper

This one's in Crater, at RA 11h 36m 16s, Dec -10* 52' 38. I expect that someone here will have observed it by the time the weekend's out.


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kt4hx
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Reged: 01/21/09

Loc: Fredericksburg, Va
Re: New Globular Cluster Discovered new [Re: KidOrion]
      #6434582 - 03/28/14 03:01 PM

Looks to be about 1 degree south of Theta Crateris. Thanks for the link

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Alvin Huey
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Re: New Globular Cluster Discovered new [Re: kt4hx]
      #6436092 - 03/29/14 01:12 PM

I haven't looked for it yet (weather is crud this weekend), but did include it in my Globular Cluster observing guide. (Page 26)

http://www.faintfuzzies.com/DownloadableObservingGuides2.html


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mattyfatz
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Re: New Globular Cluster Discovered new [Re: Alvin Huey]
      #6436382 - 03/29/14 04:03 PM

Quite amazing that there are Globulars yet to be discovered.
What's the Mag of this thing. I keep seeing -4.3.. but that's obviously not what I mean.


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kt4hx
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Re: New Globular Cluster Discovered new [Re: Alvin Huey]
      #6437658 - 03/30/14 12:16 PM

Quote:

I haven't looked for it yet (weather is crud this weekend), but did include it in my Globular Cluster observing guide. (Page 26)

http://www.faintfuzzies.com/DownloadableObservingGuides2.html




Thanks Alvin, already downloaded. I see you also updated the M3 listing as well. Appreciate the charts on the new one.


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hokkaido53
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Re: New Globular Cluster Discovered new [Re: mattyfatz]
      #6437698 - 03/30/14 12:37 PM

Quote:

Quite amazing that there are Globulars yet to be discovered.
What's the Mag of this thing. I keep seeing -4.3.. but that's obviously not what I mean.




Is this a new kind of magnitude scale? I think only Venus gets to be -4.3.

Roy


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Sasa
professor emeritus


Reged: 11/03/10

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Re: New Globular Cluster Discovered [Re: mattyfatz]
      #6437790 - 03/30/14 01:22 PM

Quote:

Quite amazing that there are Globulars yet to be discovered.
What's the Mag of this thing. I keep seeing -4.3.. but that's obviously not what I mean.




You have to look into the discovery paper. The authors state that modulus m-M=20.81m and M(V)=-4.3. This makes visual magnitude to be around 16.5, definitely out of reach of my 11cm refractor...


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Dave MitskyModerator
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Re: New Globular Cluster Discovered new [Re: hokkaido53]
      #6438676 - 03/30/14 11:51 PM

Quote:

Quote:

Quite amazing that there are Globulars yet to be discovered.
What's the Mag of this thing. I keep seeing -4.3.. but that's obviously not what I mean.




Is this a new kind of magnitude scale? I think only Venus gets to be -4.3.

Roy




In the distance modulus formula, M stands for absolute magnitude and m for apparent magnitude.

Dave Mitsky


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hokkaido53
sage


Reged: 05/07/12

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Re: New Globular Cluster Discovered new [Re: Sasa]
      #6439317 - 03/31/14 11:45 AM

Quote:



You have to look into the discovery paper. The authors state that modulus m-M=20.81m and M(V)=-4.3. This makes visual magnitude to be around 16.5, definitely out of reach of my 11cm refractor...




It's just out of reach of my 18" reflector, unless it's an unusually clear desert night.

Roy in Taos


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GlennLeDrew
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Re: New Globular Cluster Discovered new [Re: hokkaido53]
      #6440633 - 03/31/14 11:21 PM

The integrated magnitude tells only part of the tale; the surface brightness is important, too. That it took till now to find suggests to me that this cluster must have pretty low surface brightness, else it would have been reasonably apparent on the POSS plates (whivh penetrate to ~22m on point sources, iirc.)

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Astrojensen
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Re: New Globular Cluster Discovered new [Re: GlennLeDrew]
      #6441324 - 04/01/14 11:48 AM

Surprisingly, it IS visible on the red POSS II plate. Quite well, actually, these things considered, although it doesn't exactly call attention to itself.


Clear skies!
Thomas, Denmark


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GlennLeDrew
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Re: New Globular Cluster Discovered new [Re: Astrojensen]
      #6441646 - 04/01/14 02:13 PM

Thanks for checking, Thomas. Any estimate as to a qualitative or comparative surface brightness?

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Alvin Huey
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Re: New Globular Cluster Discovered new [Re: GlennLeDrew]
      #6442171 - 04/01/14 07:03 PM

According to the DeepSkyForum site where this object was originally reported, Jimi observed it with direct vision with his 48" reflector.

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nytecam
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Reged: 08/20/05

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Re: New Globular Cluster Discovered new [Re: GlennLeDrew]
      #6442227 - 04/01/14 07:36 PM Attachment (23 downloads)

This is a snap of the new GC field from tonight but will have to stack images tomorrow to see if anything is there

I don't like to be beaten but this one has - the stack of images is noisy and no GC evident I'll blame the Saharan dust and low altitude

Edited by nytecam (04/02/14 10:25 AM)


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kt4hx
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Re: New Globular Cluster Discovered new [Re: nytecam]
      #6445675 - 04/03/14 04:06 PM

Keep trying! As has been said, it likely has a very low surface brightness so it might be a real challenge for you.

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Rich (RLTYS)
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Re: New Globular Cluster Discovered new [Re: kt4hx]
      #6447084 - 04/04/14 12:12 PM Attachment (22 downloads)

Took this image of the area of this newly discovered globular cluster and I think I managed to capture a few of its brighter members. I hope to be able to reimage this cluster with the larger Slooh telescope soon.

Rich (RLTYS)


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GlennLeDrew
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Re: New Globular Cluster Discovered new [Re: Rich (RLTYS)]
      #6447117 - 04/04/14 12:26 PM

Mighty low surface brightness, indeed. Rich; your image probably has not captured much more than noise here. The stars are almost certainly (too-bright-for-the-cluster) field stars, I think.

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nytecam
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Reged: 08/20/05

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Re: New Globular Cluster Discovered new [Re: Rich (RLTYS)]
      #6448412 - 04/05/14 03:34 AM

Quote:

Took this image of the area of this newly discovered globular cluster and I think I managed to capture a few of its brighter members. I hope to be able to reimage this cluster with the larger Slooh telescope soon. Rich (RLTYS)


Contrary to Glenn's comments I think you've done exceptionally well - your shot compares favourably with Sloan DSS[Wikisky] - well done - we await your deeper image



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Rich (RLTYS)
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Re: New Globular Cluster Discovered new [Re: nytecam]
      #6448503 - 04/05/14 07:51 AM

Nytecam thanks, I compared my image to the one in the published discovery paper and the brighter stars seem to match. I definitely don't think its noise.

Rich (RLTYS)


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GlennLeDrew
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Re: New Globular Cluster Discovered new [Re: Rich (RLTYS)]
      #6448927 - 04/05/14 12:32 PM

I had first thought the visual aspect to more resemble a sparser, old open cluster due to the great disparity in luminosity between the handful of brightest members and the light from the rest of the unresolved stars, leading me to mistakenly take those resolved stars to be comparatively too bright for membership in a globular system. But I now see that a few of those stars are quite likely red giants, with, I suspect, a blue straggler or two. The rest of the cluster's light is noise dominated, though.

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