Messier 109

Observation Notes:

I didn't pick up a lot of detail in this galaxy. It displayed an elliptical shape with a strongly condensed core that almost looked double in nature, due to an overlapping foreground star. The galaxy was elongated west-southwest to east-northeast, with a core that seemed to push northwest to southeast. I estimated its dimensions at 2.5' x 4'.


M109 is a barred spiral that displays a shape reminiscent of the Greek letter Theta. It is about 55 million light years away and receding at 1,142 km/sec. It is a member of the Ursa Major Cloud. It was discovered by Pierre Méchain in 1781. Charles Messier listed it under number 99 in a preliminary manuscript, but it was not added to the official catalog until 1953 when Owen Gingerich added it.

SubjectM109 (NGC 3992)
ClassificationSpiral Galaxy (Type SBb I)
Position*Ursa Major [RA: 11:57:36 / Dec: +53:23:28]
Size*7.6' x 4.9'
Brightness*9.8 vMag. / 10.6 bMag / 13.4 Surface Brightness
Date/TimeFebruary 25, 2006 - 03:30 AM
(February 25, 2005 - 10:30 UT)
Observing Loc.Anderson Mesa, AZ
InstrumentOrion SVP 6LT Reflector (150 mm dia./1200 mm F/L)
Eyepieces/Mag.10 mm (120X)
ConditionsClear, calm, 18°F
TransparencyMag 6.8 NELM
*SourcesOrion's The Sky Software
NGC/IC Project

*Based on published data.

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This page contains a single entry by Jeremy Perez published on February 25, 2006 3:30 AM.

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