Iiro's DeepSky Sketches

Name: Messier 6	Other name: NGC 6405
RA: 17h 40.3m	DEC: -32° 15'
Constellation: SCO
Type: Open cluster
Magnitude: 4.2
Size: 20'
Surface brightness: 10
Number of stars: 80
Brightest star: 6.2
Classification: III 2 p
Description: Cl,L,iR,lC,st7,10...
Notes: Butterfly cluster,51 members to 10.5 mag incl var* BM Sco
Observer: Iiro Sairanen
Location: Boca de Tauce (1980m), Tenerife, Spain
Date: 16/17.4.2004 3:20
Instrument: Newton 110/805 mm
Magnification: 47x	Filter: -
Field: 64'	Seeing: 3
Background sky: 2	NE lim mag: 6.9
Visuality: I	Height: 19°
Weather: +2°C, moist
Description: Butterfly -shape was clearly visible. Several stars between 6-7 mag and more fainter ones...
Updated: 15.5.2004 12:41