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(IAAC) Obj: M25 - Inst: 4.5" Orion f/8 Delux Sky View
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Observation Poster: Rob Wood <r_c_wood@orbitworld.com>
Observer: Rob Wood
Your skills: Beginner (< one year)
Date/time of observation: 11:00 pm cst 07/21/01
Location of site: Lake Jackson Tx (Lat 29N, Elev 16 ft)
Site classification: Suburban
Sky darkness: 5 <Limiting magnitude>
Seeing: 5 <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 4.5" Orion f/8 Delux Sky View
Magnification: 36x, 100x
Filter(s): None
Object(s): M25
Category: Open cluster.
Class: faint globular cluster
Constellation: Sgr
Data: mag size
Position: RA 18:31 DEC 19:15
Description:
This is a very open cluster of about 30-40 individual stars. It fills the
f.o.v. at 36x. There are 2 brighter stars in the center which stand out from
the rest. There is also 4 stars directly North of these pair which form a
rectangle. Lititure says that the North Eastern star in this rectangle,
U Sgr, is a Cepheid variable and a multiple. The mags range from 6.34-7.08
during a period of 6.7 days. (ref. Star Hopping, Your Vista View to the
Universe - Robert Garfinkle)
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