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

Magn: 107x


Field: 28'

NE Lim.mag: 7,0

Background sky: 2

Seeing: 3

Height: 28
Visuality: I

Weather: +9˚C, dry and good

High compressed open cluster in Sagittarius.