Iiro's DeepSky Sketches

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Name: Messier 18Other name: NGC 6613
RA: 18h 19.9m DEC: -17° 8'
Constellation: SGR
Type: Open cluster
Magnitude: 6.9
Size: 9.0'
Surface brightness: 12
Number of stars: 20
Brightest star: 8.6
Classification: II 3 p n
Description: Cl,P,vlC
Notes: 12 * mag 9-10, 1 deg S of M17
Observer: Iiro Sairanen
Location: Ahola, Joutseno, Finland
Date: 4/5.9.2003 23:39
Instrument: Newton 406/1830 mm
Magnification: 73xFilter: -
Field: 41'Seeing: 2
Background sky: 3NE lim mag: 6.7
Visuality: IIIHeight: 3°
Weather: +5°C
Description: Vaatimaton parinkymmenen tähden muodostama avonainen.
Updated: 8.9.2003 12:05