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(IAAC) Obj: M7 (Ptolemy's Cluster, Mel 183, Cr 354) - Inst: 120mm KONUS refractor, f/8.33, equatorial
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To: IAAC <logs@visualdeepsky.org>
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Subject: (IAAC) Obj: M7 (Ptolemy's Cluster, Mel 183, Cr 354) - Inst: 120mm KONUS refractor, f/8.33, equatorial
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From: Ante Perkovic <albireo@vip.hr>
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Date: Thu, 29 Jul 2004 18:25:36 +0200
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User-Agent: Mozilla/5.0 (X11; U; SunOS sun4u; en-US; rv:1.0.1) Gecko/20020920 Netscape/7.0
Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July, 17th, 2004. 23:40h
Location of site: Konjevrate, near Sibenik, Croatia (Lat 43.6 N, Elev 450m)
Site classification: Rural
Sky darkness: 6.5 <Limiting magnitude>
Seeing: 9.5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 120mm KONUS refractor, f/8.33, equatorial
Magnification: 28x, 53x
Filter(s): None
Object(s): M7 (Ptolemy's Cluster, Mel 183, Cr 354)
Category: Open cluster
Class:
Constellation: Sco
Data: mag 3.3 size 80'
Position: RA 17h 54m DEC -39o 49'
Description:
28x: Around 20 stars inside 20', very scattered.
53x: Around 25 stars inside 20'. At the E, I see 9' long chain of 6
moderately bright stars (mags 7 to 9), with the brightest one starting
another chain, 10' long, consisting of 5 bright (mags 5 to 7) stars.
M7 and M29 both remind me of a butterfly, unlike M6 which is the
"real" butterfly.