Name: Messier 99
    Other names:  
    Description: spiral galaxy
    Ascension: 12 : 18.8
    Declanation: +14 : 25
    Apparent diameter: 5.4x4.8 (arc min)
    Constellation: Coma Berenices
    Magnitude: 9.9
    Distance: 60 million light years!
    Equipment: Meade ETX 90+icx424+focred0.66+extra lens
    Date / Time UTC: 2 april2005 21:30
    Stacked : 37 of 121 (incoming clouds)
    Exposure time: 30 seconds
    Location: Veluwe, The Netherlands
    Other info:

    little color enhanced. Due to few exposures I had to take some more 'bad' ones to get a nice picture, so the stars may look like eggs.

    M99, although situated in constellation Coma Berenices, is one of the bright spiral members of the Virgo Cluster of galaxies. It is of type Sc, rotates clockwise (unlike the nearby spiral M100), and is unusually asymmetric, the nucleus shifted to the upper end of our picture. This asymmetry could be due to semi-recent encounters with other members of the Virgo Cluster, a hypothesis which may get seconded by the fact that its recession velocity is quite high for a Virgo Cluster member: 2324 km/sec according to the Sky Catalog 2000.0, the highest recession velocity measured for a Messier galaxy (and thus a Messier object at all). This means that it is moving through the Virgo Cluster with a high proper (or peculiar) velocity of at least about 1200 km/sec, by chance in a direction pointing away from us

     

    © Job Gehéniau

    http://www.jgeheniau.nl/etx90/astronomy2.html

home