(IAAC) Obj: NGC 5740, NGC 5746 - Inst: 10.1" f/4.5 Newtonian reflector

anonymous at sedna.atmob.org anonymous at sedna.atmob.org
Tue Jul 10 12:02:47 EDT 2007


Observation Poster: Brent Reary <gmbreary at rollanet.org>

Observer: Brent Reary
Your skills: Intermediate (some years)
Date/time of observation: 7/7/07  03:40 UT
Location of site: Rolla, MO  USA (Lat 37 57', Elev )
Site classification: Rural
Sky darkness: 6.5 <Limiting magnitude>
Seeing: 6 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 10.1" f/4.5 Newtonian reflector
Magnification: 77x, 128x, 193x, 257x
Filter(s): None
Object(s): NGC 5740, NGC 5746
Category: External galaxy.
Constellation: Vir
Data: mag   size 
Position: RA :  DEC :
NGC5740; Mag 11.9, Size 2.0' X 1.0', RA 14:44.5, DEC +01:41
A faint, uniform oval halo which is aligned nearly N-S..  It shows slight,
gradual, diffuse brightening toward the core.  Steadily visible with averted
vision at 128x, it was best seen at 193x and began to fade into the background
at 257x.  NGC5738, plotted ~10' to the SW, was suspected at 128x but could
not be confirmed.  NGC5746 lies 15' NE.

NGC5746; Mag 10.3, Size 5.0' X 1.0', RA 14:45, DEC +01:57
A splinter shaped halo which is elongated nearly N-S..  It is slightly wider
in the center and tapers toward each end.  The N. end appears to be slightly
brighter than the S. end.  The halo brightens rather abruptly to a bright,
diffuse, oval nucleus which shares the same alignment as the halo.  The
Digital Sky Survey image shows a dark lane running the length of the galaxy
along the E. side.  Because none of the halo could be detected E. of the lane,
the W. edge of the lane defined the visible E. edge of the galaxy.  Visible
with direct vision at 77x, it was best seen at 257x.  The galaxy lies just S.
of a comma shaped asterism of four 8th-11th magnitude stars.

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