(IAAC) Obj: NGC6638 - Inst: 4.5" Homemade Dobson reflector, f/8

[Ante Perkovic]

Observation Poster: Ante Perkovic <albirejo_without_j at vip.hr>

Observer: Ante Perkovic
Your skills: Intermediate (some years)
Date/time of observation: July, 21th 2004., 00:10h
Location of site: Lecevica, near Split, Croatia (Lat 43.6 N, Elev 450m)
Site classification: Rural
Sky darkness: 6.2 <Limiting magnitude>
Seeing: 7 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 4.5" Homemade Dobson reflector, f/8 ("babydob")
Magnification: 25x, 48x, 79x
Filter(s): None
Object(s): NGC6638
Category: Globular cluster
Class:
Constellation: Sgr
Data: mag 9.2  size 5.0'
Position: RA 18h 31m  DEC -25° 30'
Description:
Just 40' W of Kaus Borealis
25x: Seen with direct vision, although Kaus Borealis shines in the
   corner of the FOV. Very small.
48x: Somewhat brighter in the middle, diameter 45".
79x: It grew to 1' in diameter, core visible.