Basic object information
Name: M 18
Type of object: Open cluster
Magnitude: 6.9
Size: 9.0'
Number of stars: 20
Magnitude of brightest star: 8.6
Object classification: II 3 p n
Description: Cl,P,vlC
Notes: 12 * mag 9-10; 1 deg S of M17

Catalog position for epoch J2000.0
Right ascension: 18h 19m 54.0s
Declination: -17 08' 00"

Constellation: Sagittarius

Observer: Iiro Sairanen
Obs. place: Ahola, Joutseno, Finland
Date/Time: 4/5.9.2003 23.39

Telescope: Dobson 406/1830mm

Magn: 73x

Filter:

Field: 41'

NE Lim.mag: 6,7 (Peg)

Background sky: 3

Seeing: 2

Height: 3
Visuality: I
Weather: humid, +5C

Vaatimaton parinkymmenen tähden muodostama avonainen.

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