(IAAC) Obj: NGC 3972, NGC 3982, NGC 3990, NGC 3998 - Inst: 15 inch Obsession f4,5

[anonymous at sedna.atmob.org]

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Observation Poster: Armin Hermann <burmeseinn at yahoo.com>

Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 22 May 2004
Location of site: Sangkhlaburi, Thailand (Lat 15°N, Elev 200m)
Site classification: Exurban
Sky darkness: ~5,5mag <Limiting magnitude>
Seeing: 9 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15 inch Obsession f4,5
Magnification: 131 & 244x
Filter(s): 
Object(s): NGC 3972, NGC 3982, NGC 3990, NGC 3998
Category: External galaxy.
Class: 
Constellation: UMa
Data: mag various  size various
Position: RA :  DEC :
Description:
This beautiful group of galaxies is best observed at low to medium power. At 
131x all 4 objects fit into the FOV of my 13mm Nagler.
NGC3998: 10,6magv. Appears round and very bright with a diameter of >2’. There 
is a stellar nucleus embedded in the bright small core.
NGC3990: 12,6magv. Small (~0,5’), round and fairly bright at 131x. A faint 
stellar nucleus is visible at 244x. 3990 is located only 3’ W of NGC 3998.
NGC3982: 11magv. Slightly elongated N-S with a size of 1,5x1’. The halo is 
fairly bright with a non-stellar core in its middle. Medium surface brightness. 
Located 23’ SW of NGC3998/90.
NGC3972: 12,9mag. Even at 131x this edge-on is visible only as a very faint 
4x1’ streak of light with no detail. I could see only a slight central 
brightening but no nucleus. Located 19’ WSW of 3998/90.
Another faint galaxy (NGC 3977, 14mag) 5’ NE of NGC 3972 escaped my view this 
time. Anyway, I will visit this group of galaxies again as it is a very nice 
target in UMa.

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