M105 and Friends
|Top: NGC 3389||Right: NGC 3384||Left: NGC 3379 (M105)|
|Type:||Spiral galaxy||Elliptical galaxy||Elliptical galaxy|
|Distance:||63 million light years||31 million light years||37 million light years|
|Diameter:||49,000 light years||47,000 light years||52,000 light years|
|Apparent size:||2.7 arc min||5.2 arc min||4.9 arc min|
Sometimes when I take this kind of image I find unanticipated distant objects in the backgound and I enjoy tracking down their identification and distance. This shot was no exception, with two very faint (15th magnitude) galaxies marked A and B in the right hand bottom corner below:
Galaxy A is called 2MASX J10485882+1300587 and its distance is around 500 million light years.
Galaxy B is called 2MASX J10483408+1258590 and its distance is around 480 million light years.
|Exposure:||116 min (32 subs @ 217.9 sec)|
|Field of View (feature image):||68.6 x 45.7 arc-min|
|Feature image date:||2021-03-24|
Above: location of Leo in the sky.
Right: location of galaxies in Leo
If the Astrometry images do not appear, it is because the Astrometry website is sometimes off line.
|SkyWatcher Esprit 120 mm apochromatic 3-element refractor; 840 mm f/l @ f/7.|
|Field flattener; ZWO Duo-band Hα (656nm) and [OIII] (500nm) filter.|
|SkyWatcher EQ6-R Pro mount; ZWO ASI120 guide camera.|
|Imaging camera: ZWO ASI 071 MC Pro (CMOS 28.4mm 16 Mpx).|
|Software: Telescope control: Cartes du Ciel, EQMOD, PHD2, Imaging: SharpCap, Gimp.|
|Observatory location: 34° South.|
Images © Roger Powell
I’m a founder member and webmaster of Macarthur Astronomical Society