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Observing >> Deep Sky Observing

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VanJan
super member


Reged: 07/09/08
Posts: 111
Pegasus I Galaxy Cluster
      #2580307 - 08/14/08 05:55 AM

Difficult with 8" apeture under mag 4.5 skies. Doable with detailed chart of the area to pinpoint exact location of individual galaxies. Follows are my observations of the three members I managed to see, all at 167X. NGC 7619: Small, faint oval halo slightly extended NE to SW. No core region. Faint stellar nucleus. NGC 7626: Small, very faint round halo. No core region. Extremely faint stellar nucleus. NGC 7623: Very small, extremely faint elliptical halo extended N-S. No core region. No nucleus. Extremely faint star closely np.

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Americal
super member


Reged: 09/14/07
Posts: 120
Loc: Under the L. A. lightdome
Re: Pegasus I Galaxy Cluster new [Re: VanJan]
      #2580862 - 08/14/08 12:19 PM

I agree, in my backyard it is difficult in my C11. Given a dark sky the Pegasus/Pisces region gives up a lot of objects. In NELM 6.5-6.8 skies I've gotten as many as 8 of the members of the cluster with a little work. I find some of the smaller galaxies like NGC 7611 and 7634 easier because of the higher surface brightness. A nice area to spend some time.

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Tom
It's OK Mom, I can fixit
-----------------------
4 1/4" f/5 homebuilt Newt
6" f/8 homebuilt Newt
8" f/5.1 homebuilt Newt
C11 ASGT (no, it's not homebuilt)


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sgottlieb
sage


Reged: 07/22/07
Posts: 237
Loc: SF Bay area
Re: Pegasus I Galaxy Cluster new [Re: VanJan]
      #2581403 - 08/14/08 03:58 PM

Quote:

Difficult with 8" apeture under mag 4.5 skies.... NGC 7623: Very small, extremely faint elliptical halo extended N-S. No core region. No nucleus. Extremely faint star closely np.




Excellent observation of NGC 7623 under those conditions.

I can still remember the first time I took at NGC 7619/7626 with a C-8 back in 1981 and was amazed to pick up a galaxy (NGC 7623) that was not plotted on the Sky Atlas 2000.0 (or perhaps I was using Becvar's Atlas of the Heavens). In any case, it was definitely exciting to "discover" an unplotted galaxy in an 8"!

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Steve Gottlieb
18" f/4.3 Starmaster
Adventures In Deep Space - New article on MASH planetaries
7500+ NGC/IC Visual Descriptions
NGC/IC Project


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nytecam
Post Laureate


Reged: 08/20/05
Posts: 4780
Loc: London UK
Re: Pegasus I Galaxy Cluster new [Re: sgottlieb]
      #2584469 - 08/16/08 03:50 AM Attachment (20 downloads)

Nicely recorded observation Steve This forum's a wonderful challenge for my London backyard's tiny ETX-70 with a little help from my tiny cam of course chart below

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Nytecam 51N 0.1W
Meade 30cm LX200+ETX-70+DS-2090+C8+Ha+CaK PSTs SBIG SGS+homebuilt spectrographs
Starlight SXVF_M9/Lodestar/Canon 300D DSLR/Fuji E550
My observatory build-ETX-70 imaging-spectro page




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nytecam
Post Laureate


Reged: 08/20/05
Posts: 4780
Loc: London UK
Re: Pegasus I Galaxy Cluster new [Re: nytecam]
      #2606493 - 08/27/08 05:24 AM Attachment (26 downloads)

Below is a recent 'finder' chart of the Peg 1 galaxy group area circled 1 degree diameter with brighter galaxies in the mag 11-12 range marked together with a few stars in the same mag range. Brightest field star is mag 6.9 GSC 1162:373. Hope is of use

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Nytecam 51N 0.1W
Meade 30cm LX200+ETX-70+DS-2090+C8+Ha+CaK PSTs SBIG SGS+homebuilt spectrographs
Starlight SXVF_M9/Lodestar/Canon 300D DSLR/Fuji E550
My observatory build-ETX-70 imaging-spectro page




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murzim
newbie


Reged: 08/26/08
Posts: 3
Loc: Belgium
Re: Pegasus I Galaxy Cluster new [Re: nytecam]
      #2608958 - 08/28/08 06:40 AM

Hi,

2 years ago, I observed the Pegasus I galaxy cluster with my 15" Obsession and I saw 13 galaxies in the central region:

NGC 7619: big and bright oval nebula, gradually brighter middle with a starlike core, maybe a little bit brighter than NGC 7626 in the same field of view in 13mm Nagler
NGC 7626: about the same size and magnitude as NGC 7619, but with averted vision somewhat bigger oval nebula with a gradually brighter middle and with a big round central zone
NGC 7608: elongated nebula, clearly seen with averted vision (much easier than nearby UGC 12510)
NGC 7611: directly seen as a quite small nebula, elongated NW-SE with a bright and obvious core. Lies somewhat NW of a bright star.
NGC 7612: oval nebula with a bright, almost starlike core. One of the brightest members of Pegasus I.
NGC 7615: quite weak oval-elongated nebula. No surface details seen.
NGC 7617: small, quite weak elongated oval nebula with a brighter core, SW of NGC 7619. Elongated NE-SW.
NGC 7631: quite large and obviously oval-elongated nebula with a patchy surface?
IC 5309: elongated nebula, less bright than NGC 7611 but still easily seen. Weak star in halo visible.
UGC 12510: very weak elongated nebula, only visible with averted vision. No further details.
UGC 12535: very weak nebula, only seen with averted vision.
CGCG 406-79: not 100% sure, very weak elongated streak with averted vision
CGCG 406-69: very weak, only seen with averted vision as a small patch without orientation or details

I missed NGC 7623 though, I should have seen it with 15" of aperture...

Jan


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Ptarmigan
Carpal Tunnel


Reged: 09/23/04
Posts: 1873
Loc: Arctic
Re: Pegasus I Galaxy Cluster new [Re: VanJan]
      #2613811 - 08/30/08 04:11 PM

Not bad for being in a not so great sky condition. Hmmmmmm, I might give this a try.

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Ptarmigans=Cute and Cuddly


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nytecam
Post Laureate


Reged: 08/20/05
Posts: 4780
Loc: London UK
Re: Pegasus I Galaxy Cluster new [Re: Ptarmigan]
      #2634191 - 09/10/08 04:55 AM

For reference my annotated 1 deg wide shot of Peg I galaxy gp from last night here. Hope it's of interest

--------------------
Nytecam 51N 0.1W
Meade 30cm LX200+ETX-70+DS-2090+C8+Ha+CaK PSTs SBIG SGS+homebuilt spectrographs
Starlight SXVF_M9/Lodestar/Canon 300D DSLR/Fuji E550
My observatory build-ETX-70 imaging-spectro page




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