Basic object information
Name: M 101
Type of object: Galaxy
Magnitude: 7.9
Surface brightness: 14.0 mag/sq arcmin
Size: 28.5'x28.3'
Object classification: SBc
Description: pB,vL,iR,g,vsmbM,BSN
Notes: P w NGC 5474;SN 1909;spir galax w one heavy arm;B knot E

Catalog position for epoch J2000.0
Right ascension: 14h 03m 12.8s
Declination: +54 21' 02"

Constellation: Ursa Major

Observer: Iiro Sairanen
Obs. place: Base del Teide (2280m above sea level), Tenerife, Spain
Date/Time: 19/20.4.2004 1:45

Telescope: Newton 110/805mm

Magn: 64x


Field: 47'

NE Lim.mag: 7,0

Background sky: 2

Seeing: 2

Height: 28
Visuality: II

Weather: +11˚C, thin highclouds

Low surface brightness but hints of spiral structure were easily in view with averted vision. Knots in W, NE and SE -areas.