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(IAAC) Obj: M 71 - Inst: 13" f/5.6 Newt on Bigfoot German EQ mount
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Observer: Steve Coe
Your skills: Advanced (many years)
Date/time of observation: 22 June 98
Location of site: Strawberry, Arizona USA (Lat +34, Elev 7000 ft)
Site classification: Rural
Sky darkness: 9 <1-10 Scale (10 best)>
Seeing: 8 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 13" f/5.6 Newt on Bigfoot German EQ mount
Magnification: 100X, 220X, 440X
Filter(s): none
Object(s): M 71
Category: Globular cluster.
Class:
Constellation: Sge
Data: mag 8.0 size 7'
Position: RA 19:53 DEC +18:47
Description:
The bright globular is seen in the 11X80 finder: it is easy in a rich Milky
Way field of view. At 100X in the 13" it is bright, large, much compressed,
rich and has 14 stars resolved in a triangular shape. Moving up to 220X
resolves 28 stars across a silvery surface of unresolved stars, the 12th
mag star in the center is a double of equal magnitude. At 440X there are
57 stars seen and the double in the middle is split nicely. At this high
power on a superb night in the Arizona mountains, it seems that this is
all that the 13" will show on this object, a lovely compressed ball of
stars afloat in a rich Milky Way field of view.
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** This observing log automatically submitted via the Web from:
http://www.visualdeepsky.org/enter-log.html