Iiro's DeepSky Sketches

Name: Messier 7Other name: NGC 6475
RA: 17h 53.9m DEC: -34° 48'
Constellation: SCO
Type: Open cluster
Magnitude: 3.3
Size: 80.0'
Surface brightness: 12
Number of stars: 80
Brightest star: 5.6
Classification: II 2 r
Description: Cl,vB,pRi,lC,*7...12
Notes: 80 members to 10th mag,Fine naked eye cluster
Observer: Iiro Sairanen
Location: Boca de Tauce (1980m), Tenerife, Spain
Date: 16/17.4.2004 3:05
Instrument: Newton 110/805 mm
Magnification: 25xFilter: -
Field: 120'Seeing: 3
Background sky: 2NE lim mag: 6.9
Visuality: IHeight: 14°
Weather: +2°C, moist
Description: Very rich and beatiful open cluster in very rich field. Several strars are brighter than 10 mag. Quite uncomfortable to draw because of numerous stars. 25x gives the best view and whole object fits in the field.
Updated: 15.5.2004 12:39