(IAAC) Obj: NGC 5490, NGC 5490B, NGC 5490C, IC 982, IC 983 - Inst: 15" f4,5 Obsession

Observation Poster: Armin Hermann <burmeseinn@yahoo.com>
Observer: Armin Hermann
Your skills: Advanced (many years)
Date/time of observation: 11 Apr 2005
Location of site: Sangkhlaburi, Thailand (Lat 15.09 N, Elev 200)
Site classification: Exurban
Sky darkness: 5,8 <Limiting magnitude>
Seeing: 10 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15" f4,5 Obsession
Magnification: 342x
Filter(s): none
Object(s): NGC 5490, NGC 5490B, NGC 5490C, IC 982, IC 983
Category: External galaxy.
Constellation: Boo
Data: mag var  size var
Position: RA :  DEC :
NGC 5490 (12,1mag, 2,3x1,8'): Bright oval extending N-S. At 342x the
stellar core is visible.
NGC 5490B (14,6mag, 0,7x0,4'): At 342x difficult with AV. Faint small
patch of light without any structure.
NGC 5490C (13,9mag, 1,1x0,8'): Tiny dot with averted vision. Difficult
and faint.
IC 982 (13mag, 1,1'): Fairly easy. Stellar nucleus visible at 342x.
IC 983 (11,7mag, 5,5x5'): slightly brighter than IC982. Easy with
stellar core. The faint huge halo is not visible.
At 131x magnification only NGC 5490, IC 982, IC 983 are visible.  The
galaxies of this group are just 12' apart and fit into the FOV of the
5mm Nagler at 342x.
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