(IAAC) Obj: NGC 4517, NGC 4517A, NGC 4493 - Inst: 15" f4,5 Obsession

[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: 11 May 05
Location of site: Sangkhlaburi, Thailand (Lat 15.09 N, Elev 200m)
Site classification: Exurban
Sky darkness: 5,8 mag <Limiting magnitude>
Seeing: 10 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 15" f4,5 Obsession
Magnification: 131x - 342x
Filter(s): 
Object(s): NGC 4517, NGC 4517A, NGC 4493
Category: External galaxy.
Class: 
Constellation: Vir
Data: mag various  size various
Position: RA :  DEC :
Description:
NGC 4517 (10,4magv, 10x1,5'): Appears a a huge and thin 10 x1,5' edge on galaxy 
that neary spans across the entire FOV at 342x magnification. It extends roughly E-W
 with the W part being slightly brighter. A dark lane does run along the entire edge-on 
structure but there is no core or significant central brightening visible. NGC 4517 
does also show some faint motted structure at high magnification. Even though 
NGC 4517 is so huge, its surface brightness is quite high and it does take high 
magnification well - clear skies provided, of course. 
NGC 4517A (12,5magv, 4x2,5'): 16' N of NGC 4517. Very faint 3x2' haze of light 
without any structure. Difficult at 342x.
NGC 4493 (14,1magv, 1x0,8'): 38' NW of NGC 4517. Faint N-S elongated galaxy 
1x0,5' size. Slightly brighter core is visible at 342x.

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