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(IAAC) Obj: M3 (NGC 5272) - Inst: Brennweite 12.5 inch F/4.1 reflector (homemade)
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Observation Poster: Steven H. Yaskell <steven.yaskell@wtnord.net>
Observer: Steven H. Yaskell
Your skills: Advanced (many years)
Date/time of observation: April 7, 2007, 2151 UT
Location of site: Stockholm, Sweden (Lat 59:33, Elev 61m/200ft)
Site classification: Suburban
Sky darkness: <3, 4? <Limiting magnitude>
Seeing: 9 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: Brennweite 12.5 inch F/4.1 reflector (homemade)
Magnification: 25, 40, 80, 100, 103, 158, 200
Filter(s): UHC, Deep Sky
Object(s): M3 (NGC 5272)
Category: Globular cluster.
Class: VI
Constellation: Canes Venatici
Data: mag 6 size >10 '
Position: RA 13h:39 DEC +28:c. 40
Description:
Low power (25, 80) shows an asterism of three stars (mag 7? to 9?)
surrounding this hazy object, noticeably brighter than M 53 (my observation
of April 6, 2007 at c. 2130 UT, with about the same seeing as tonight-which I
left out of the log!). Also noticeably larger. I note a glow around the main
ball of stars (over 45,000 by some counts) about an arc second away and this
is probably the collected light of outliers.
I do not discern outliers at any power. UHC at higher power (103 and above)
gives me some sandy contrast. Averted vision shows this better and at one
point I see a silver flash from one point in the middle of the ball.
Light pollution is always a challenge: hop from Arcturus strraight NE after
identifying with good binoculars. 200 power shows a glowing ball with little
contrast but shows me the halo of light from the outliers (if that is what it
is) a bit more.
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