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good DSO haul around Plough


nytecam

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Rare transparent skies last night after clearing rain.  Plenty to capture around the Plough including M51/81/82/97/101/108, AGC1239 etc.

Starting with Hickson 50 and a couple of distant but relatively bright quasars at mag ~16.5 eg Q1123+594 @7.2BLY & Q1116+603 @ 11BLY.  Also PNe M97 in 60s and inset crop binned 2x2 for extra camera 'speed' in just 5s exp !  Use 30cm f/4 SCT + mono SX Lodestar-Mx2 + SX s/w :grin:

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Thanks guys for the 'likes' :smiley: .

AGC1239 in 4m exp is within the Plough/Dipper 'bowl' has 47gx with the brightest ~m17.5 and 14' diam [=Megastar] - my count >50 so I've ticked some stars too IDed from POSS2 red plate!   Don't know the distance of this gx group but perhaps Martin can advise ?  Suspect it's remote :grin:

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Love M108!

Next time take a pick of the Copeland Septet in Leo. We were looking at this in the big dobs at SGLX.

Mark

Mark - thanks - try this link for Copeland 7 @ http://stargazerslounge.com/topic/218637-hickson-compact-groups-8-moon-nil/?hl=%2Bcopeland#entry2357573  Think I've done it in the past but under what name? - NGC/HGC or pop :evil:

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Great deep work!

Here's a map of the AGC 1239 area. Looking at the galaxies in LEDA (down to mag 22) I'd say its around 2-3 billion LYs but difficult to tell. Stars plotted down to mag 20 but remember that some of these are probably galaxy misidentifications.

attachicon.gifAbell1239.pdf

Martin

Thanks Martin for chart and distance estimate - it sounds about right for the faintness of these gx on POSS2 red and my pic.  Still find it amazing that amateur shots match-up well with Palomar plates - Mx2 like having super-vision - quite a buzz :evil:

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Nice shots!

I am curious, what are you doing to prevent the cores of the brighter galaxies from being blown out? Does the SX sw have some kind of HDR option?

LodestarLive has two nonlinear DR mapping options but I have not mastered them sufficiently.

Thank you,

--Dom

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Now I have seen 3613/9 visually...both were visible with direct vision!

Well done Stuart..  Megastar quotes photographic mags [P] and visual usually a bit brighter...

NGC 3613 = m11.8[P]; RV=2054k/s / c = z0.007 = 98MLY range

NGC 3619 = m12.5[P]; RV=1649k/s / c = z0.005 = 70MLY range ....where c=300000k/s

best Nytecam

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Nice shots!  I am curious, what are you doing to prevent the cores of the brighter galaxies from being blown out? Does the SX sw have some kind of HDR option?

LodestarLive has two nonlinear DR mapping options but I have not mastered them sufficiently.

Thank you, --Dom

Hi Dom - SX s/w before HDR invented !....  there are various stretching options to control core 'blow-out'.  When I've time I'll do a sample of each :evil:

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