Iiro's DeepSky Sketches

Name: Messier 109	Other name: NGC 3992
RA: 11h 57.6m	DEC: +53° 22'
Constellation: UMA
Type: Galaxy
Magnitude: 9.8
Size: 7.5' x 4.4'
PA: 68°
Surface brightness: 13.6
Classification: SBbc
Description: cB,vL,pmE,sbM,BN
Notes: H IV 61,theta struc barred sp,Gamma UMa 40' NW
Observer: Iiro Sairanen
Location: Härskiänsaari, Ruokolahti, Finland
Date: 23/24.4.2006 1:50
Instrument: Newton 457/2280 mm
Magnification: 183x	Filter: -
Field: 16'	Seeing: 2
Background sky: 2	NE lim mag: 6.4
Visuality: I	Height: 66°
Weather: -2°C
Description: Very difficult details are in view with averted vision. The central bar goes thru the core which is pretty bright and round. Some spiral structure are faintly visible on the NW and SE.
Updated: 13.5.2006 11:18
Name: Messier 109	Other name: NGC 3992
RA: 11h 57.6m	DEC: +53° 22'
Constellation: UMA
Type: Galaxy
Magnitude: 9.8
Size: 7.5' x 4.4'
PA: 68°
Surface brightness: 13.6
Classification: SBbc
Description: cB,vL,pmE,sbM,BN
Notes: H IV 61,theta struc barred sp,Gamma UMa 40' NW
Observer: Iiro Sairanen
Location: Ahola, Joutseno, Finland
Date: 2/3.4.2003 23:30
Instrument: Newton 406/1830 mm
Magnification: 244x	Filter: -
Field: 13'	Seeing: 2
Background sky: 3	NE lim mag: 6.1
Visuality: II	Height: 79°
Weather: -10°C
Description: Yksi vaikeimmista Messier-kohteista. Aluksi näkyvissä oli ainoastaan tähtimäinen ydin, jota ympäröi keskuspullistuma. Pitemmän tutkiskelun jälkeen alkoi paljastua spiraalirakennetta. Eteläinen spiraalihaara oli loppujen lopuksi melko helppo. Pohjoinen haara epäselvä ja diffuusi.
Updated: 9.4.2003 9:53