(IAAC) Obj: NGC 3504, NGC 3512 - Inst: 10.1" f/4.5 Newtonian reflector

anonymous at sedna.atmob.org anonymous at sedna.atmob.org
Thu May 17 22:40:45 EDT 2007


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

Observer: Brent Reary
Your skills: Intermediate (some years)
Date/time of observation: 5/15/07  03:40 UT
Location of site: Rolla, MO  USA (Lat 37 57'N, Elev )
Site classification: Rural
Sky darkness: 6.5 <Limiting magnitude>
Seeing: 7 <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 3504, NGC 3512
Category: External galaxy.
Class: 
Constellation: LMi
Data: mag   size 
Position: RA :  DEC :
Description:
NGC3504; Mag 11.1, Size 1.0' X 1.0', RA 11:03, DEC +27:58
A round halo which, during moments of steady seeing, appears slightly
mottled.  It abruptly brightens to a bright, stellar core.  Visible with
direct vision at 77x, it was best seen at 193x-257x.  The galaxy lies near
the center of a semicircle of four 12th and 13th magnitude field stars which
span ~5'.  NGC3512 lies 12' NE..

NGC3512; Mag 12.3, Size 1.0' X 1.0', RA 11:04, DEC +28:02
A uniform round halo which shows no detectable brightening toward the core.
Visible with averted vision at 77x, it was best seen at 128x and began to
fade into the background at 193x.  NGC3515, plotted ~14' NNE, could not be
seen.

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