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Observing >> Deep Sky Observing
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Manousos
newbie


Reged: 06/11/08
Posts: 3
Hickson 94c 15,6 mag!!! Is that possible?
      #3297140 - 08/27/09 06:24 AM
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Hi there.
I'm Manousos, a two year amateur astronomer from Greece. This is my first post here in CN and I need your help please.

In the last two years I have made a several number of observing sessions (above 50). In the last one I made a personal record (at least I think so) catching the very dim photons of a galaxy. The galaxy was the 3d member of Hickson 94 galaxy group, the H94c or PGC 70943. This galaxy is about 15,6 magnitude (in my Hickson catalog) .

The object was verified by my friend, an experienced observer too. Our observing site is in Crete island in Skinakas observatory (about 5000 feet height), with very good sky.
Does anyone have observed this galaxy? Is it possible to see a 15,6 magnitude object with 12"?

Thank you in advance.

--------------------
GSO 12" F/5 Dob
Panoptic 24mm, MeadeSWA 18mm, Nagler 11mm,9mm,7mm
Lumicon UHC,OIII,H-beta

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AlanK
professor emeritus


Reged: 01/26/07
Posts: 512
Loc: Auckland, New Zealand
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: Manousos]
      #3297162 - 08/27/09 06:48 AM
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Well done and yes a galaxy of that magnitude is possible with a 12" especially if you have a dark sky (I presume that will be so at 5000 ft!). Being a small, compact and relatively high surface brightness object helps too.

--------------------
Clear skies!

18 inch f4.5 Obsession #1637
12 inch f5.4 reflector

Just another frozen astronomer
Kumeu Observatory
Auckland NZ
7,276 deep sky objects incl 4,670 ngcs

Who dares - observes!

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Jim Curry
sage


Reged: 10/29/07
Posts: 432
Loc: Maine
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: AlanK]
      #3297239 - 08/27/09 08:14 AM
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What a catch. Sounds like a great site.

Jim

--------------------
Vixen 140 refractor

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JakeSaloranta
sage


Reged: 09/18/08
Posts: 234
Loc: Sisu, Sauna, Sibelius...
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: Manousos]
      #3297297 - 08/27/09 08:51 AM
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Quote:

Does anyone have observed this galaxy? Is it possible to see a 15,6 magnitude object with 12"?



Of course it is. My notes with 8" dobson say I saw only two brightest galaxies from Hickson 94 on an excellent night. The C-component and other faint galaxy MAC 2316+1845 might be within the limits of my 8". Worth a shot under good skies.

/Jake

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Manousos
newbie


Reged: 06/11/08
Posts: 3
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: JakeSaloranta]
      #3297387 - 08/27/09 09:33 AM
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Thank you everyone for your comments.
I was never go so deep and I was surprised.
Until now the faintest galaxy I've observed was 15,2 (not certainly sure) and the jump to 0,4 mag up was "scared me".
I was wondering if the magnitude is correct.

Does anyone now about a reliable source with magnitude values in these faint galaxies?

--------------------
GSO 12" F/5 Dob
Panoptic 24mm, MeadeSWA 18mm, Nagler 11mm,9mm,7mm
Lumicon UHC,OIII,H-beta

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Jeff Young
Post Laureate
*****

Reged: 08/04/05
Posts: 4115
Loc: Ireland
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: Manousos]
      #3297405 - 08/27/09 09:42 AM
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Keep in mind that brightness is often quoted in the photographic range. A target might be brighter or dimmer than that visually, depending on whether it has more or less light near the scotopic peak (around 510nm).

Cheers,
-- Jeff.

--------------------
Nikon 18x70s / UA Millennium                                       Colorado:
Solarscope SF70 / TV Pronto / AP400QMD                       Coronado SolarMax40 DS / Bogen 055+3130
APM MC1610 / Tak FC-100 / AP1200GTO                        Tak Mewlon 250 / AP600EGTO

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HellsKitchen
sage


Reged: 09/05/08
Posts: 356
Loc: Melbourne Australia
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: Jeff Young]
      #3299546 - 08/28/09 09:41 AM
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I've seen mag 15.9 stars with my 12" from a suburban site, so a small HSB galaxy of mag 15.6 could very well be possible with a 12" from a dark sky site at 5000ft

--------------------
S 38º 00' E 145º20'

Custom 12" F/4.6 dob
10" GSO dob
Intes M500 Mak
4.5" Meade Newtonian
Set of Vixen LVWs + TV barlows + powermates
Astronomik 0III, UHC, H-beta filters



Edited by HellsKitchen (08/28/09 09:46 AM)

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Manousos
newbie


Reged: 06/11/08
Posts: 3
Re: Hickson 94c 15,6 mag!!! Is that possible? new [Re: HellsKitchen]
      #3301955 - 08/29/09 01:25 PM
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In a small search that I have done, I've discovered that the magnitude values of the hickson galaxies are in b and not v magnitude. Thus, it could be possible to be brighter than 15,6 in v magnitude.

One good night I've reach above 16 magnitude stars, so it could be possible to see much fainter objects than this.

--------------------
GSO 12" F/5 Dob
Panoptic 24mm, MeadeSWA 18mm, Nagler 11mm,9mm,7mm
Lumicon UHC,OIII,H-beta

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