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(IAAC) Obj: M4 (NGC 6121) - Inst: 10-inch, f/4.5, Dobsonian
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Observation Poster: Mitchell Diers <deltacassopeiae@hotmail.com>
Observer: Mitchell Diers
Your skills: Intermediate (some years)
Date/time of observation: June 11, 2002 End of Evening Astronomical Twilight and Midnight
Location of site: Turlock, CA (Lat 120deg.50min, Elev 167 ft.)
Site classification: Urban
Sky darkness: 8 <1-10 Scale (10 best)>
Seeing: 8 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 10-inch, f/4.5, Dobsonian
Magnification: 44x, 118x, and 178x
Filter(s): None
Object(s): M4 (NGC 6121)
Category: Globular cluster.
Class:
Constellation: Scorpius
Data: mag 7.4 size 20'
Position: RA 16:21 DEC 26:24
Description:
At 44x M4 looks bright and does not look as dense as some other globular star clusters. I can see many bright individual stars and also many dim ones too. What I found interesting about this star cluster is that this star cluster shows a straight line of stars going down the center. But this is only using peripheral vision. It looks really neat at low power but at 118x I can see it with direct vision and it may look like it is curving at one end of the cluster but just a tad bit. At 178x this cluster shows even more detail but can't see increasing dim stars. It is worth seeing!
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