Iiro's DeepSky Sketches

Name: Messier 23	Other name: NGC 6494
RA: 17h 57.1m	DEC: -18° 59'
Constellation: SGR
Type: Open cluster
Magnitude: 5.5
Size: 27.0'
Surface brightness: 13
Number of stars: 150
Brightest star: 9.2
Classification: III 1 m
Description: Cl,B,vL,pRi,lC,*10..
Notes: 100 members to 13th mag
Observer: Iiro Sairanen
Location: Base del Teide (2280m), Tenerife, Spain
Date: 18/19.4.2004 5:17
Instrument: Newton 110/805 mm
Magnification: 64x	Filter: -
Field: 47'	Seeing: 3
Background sky: 2	NE lim mag: 7
Visuality: I	Height: 41°
Weather: +9°C, perfecto
Description: Beatiful starchains all over the cluster. About 70 stars visible.
Updated: 15.5.2004 13:37