Iiro's DeepSky Sketches

Name: NGC 4639Other name: UGC 7884
RA: 12h 42.9m DEC: +13° 15'
Constellation: VIR
Type: Galaxy
Magnitude: 11.5
Size: 2.9' x 2'
PA: 123°
Surface brightness: 13.2
Classification: SBbc Ring
Description: pB,S,E,R,*12 sf 1'
Notes: H II 125,comp 2.9',NGC 4654 @ 17.5'
Observer: Iiro Sairanen
Location: Ania, Pirkkala, Finland
Date: 18/19.4.2009 2:40
Instrument: Newton 300/1500 mm
Magnification: 300xFilter: -
Field: 14'Seeing: 3
Background sky: 2NE lim mag: 6.9
Visuality: IIHeight: 36°
Weather: -6°C, gusts of wind
Description: Weak arcs of ring-structure were visible on the NW and SE side of the elliptical core. NW arc is larger and easier.
Updated: 16.8.2009 19:03