(IAAC) Obj: M54 - Inst: 9x63 binoculars

Observation Poster: Stéphane Meloche <stephanemeloche@videotron.ca>
Observer: Stéphane Meloche
Your skills: Intermediate (some years)
Date/time of observation: 2004/08/20 23h29 EST
Location of site: Ste-Catherine-de-Hatley, Qc, Canada (Lat 45.2083° N, Elev 343 m)
Site classification: Exurban
Sky darkness: 5.9 <Limiting magnitude>
Seeing:  <1-10 Seeing Scale (10 best)>
Moon presence: None - moon not in sky
Instrument: 9x63 binoculars
Object(s): M54
Category: Globular cluster.
Class: III
Constellation: Sgr
Data: mag 7.7  size 9.1'
Position: RA 18:55  DEC -30:29
In Sagittarius, at ~1¾° S-W of Ascella. Very easy to locate, M54 is a globular cluster more luminous than M69 or M70, but there remains pale taking into account it is very low above the horizon. Of low dimension, M54 does not present a peripheral halo with averted vision. By moments, I almost have the impression of a star, although the core is not stellar in apperance. Probably due to the high degree of concentration of M54. Note that this globular cluster is extragalactic, associated to a dwarf galaxy in collision with the Milky Way (Sagittarius Dwarf Galaxy).
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