Messier 91 (NGC 4548)

Sketch of Messier 91 (M91 / NGC 4548)

Sketch of Messier 91 (NGC 4548)

Click image to view larger version.

Observation Notes:

M91 appeared circular with a strongly condensed core. A prominent bar crossed the disc at a PA of about 80 degrees. The western half of this bar appeared to be a bit brighter. I couldn't detect any hint of the extended spiral arm structure.

Sketch/DSS Photo Comparison of Messier 91 (M91 / NGC 4548)

Sketch/DSS Photo Comparison of Messier 91 (NGC 4548)

Object Information:

M91 is a barred spiral galaxy in the Virgo cluster that is receding at about 400 km/sec. Since the cluster as a whole is receding at 1,100 km/sec, the galaxy moving through the cluster at 700 km/sec. It was discovered by Charles Messier in 1781, and is also cataloged as NGC 4548, UGC 7753, MCG+03-32-075, H II-120, h 1345, GC 3093, CGCG 099.096, VCC 1615, IRAS 12328+1446, PGC 41934.

SubjectM91 (NGC 4548)
ClassificationBarred Spiral Galaxy (SBb)
Position*Coma Berenices [RA: 12:35:27.2 / Dec: +14:29:48]
Size*5.4' x 4.3' - PA: 150° (Bar = 65 °)
Brightness*10.4 vMag; 11.0 bMag; 13.6 Surface Brightness
Date/TimeAPR 27, 2009 - 12:50 AM (APR 27, 2009 - 07:50 UT)
Observing Loc.Flagstaff, Arizona - Home
InstrumentOrion SkyQuest XT8 Dobsonian (203 mm dia./1200 mm F/L)
Eyepieces/Mag.Pentax XW10 (120X)
ConditionsClear, calm, porch lights
TransparencyMag 5.8 NELM
*SourcesSEDS; NGC/IC Project; DSS; Starry Night Pro Plus 5; Atlas of the Messier Objects - Ronald Stoyan

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This page contains a single entry by Jeremy Perez published on September 21, 2009 2:35 AM.

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