Iiro's DeepSky Sketches

Name: Messier 4Other name: NGC 6121
RA: 16h 23.6m DEC: -26° 32'
Constellation: SCO
Type: Globular cluster
Magnitude: 5.9
Size: 26.3'
Surface brightness: 12
Classification: IX
Description: Cl,8 or 10 B* in line,rrr
Notes: Look for central bar structure
Observer: Iiro Sairanen
Location: Boca de Tauce (1980m), Tenerife, Spain
Date: 16/17.4.2004 2:57
Instrument: Newton 110/805 mm
Magnification: 64xFilter: -
Field: 47'Seeing: 3
Background sky: 2NE lim mag: 6.9
Visuality: IIHeight: 29°
Weather: +2°C, moist
Description: An eye-catching central bar structure and several other brighter areas all around the object. Hundreds of stars resolved easily down to nucleus. One of the most beautiful globular.
Updated: 15.5.2004 12:45