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Basic object information
Name: M 21
Type of object: Open cluster
Magnitude: 5.9
Size: 13.0'
Number of stars: 70
Magnitude of brightest star: 7.3
Object classification: I 3 m
Description: Cl,pRi,lC,st9...12
Notes: In Sgr OB1,36 members to 12th mag
Catalog position for epoch J2000.0
Right ascension: 18h 04m 36.0s
Declination: -22° 30' 00"
Constellation: Sagittarius
Observer: Iiro Sairanen
Obs. place: Base del Teide (2280m above sea level), Tenerife, Spain
Date/Time: 18/19.4.2004 3:50
Telescope: Newton 110/805mm
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Magn: 107x |
Filter: |
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Field: 28' |
NE Lim.mag: 7,0 |
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Background sky: 2 |
Seeing: 3 |
Height: 28°
Visuality: I
Weather: +9˚C, dry and good
High compressed open cluster in Sagittarius.