IC 2948, Caldwell 100
|Magnitude: +4.5||Diameter: 8.5 light years.|
|Apparent size: 75 x 50 arc min||Distance: 6,500 light years.|
|Constellation: Centaurus||Type: emission nebula|
The Lambda Centauri Nebula, Caldwell 100 has two regions, which together extend outside my telescope field of view. The above image is of the region known as IC 2948. The other region extends beyond the top of this image and is known as IC 2944, which I imaged in March 2021.
As I stated then, the nebula is noted for its Bok Globules – small dark regions, embedded in dense molecular hydrogen nebulae and cosmic dust. It is within such regions, where the surrounding nebula is condensing, that star formation processes begin.
According to Wikipedia, Bok Globules “typically have a mass of about 2 to 50 solar masses contained within a region about a light year or so across. They contain molecular hydrogen (H2), carbon oxides and helium and around 1% (by mass) silicate dust”.
Here again is the cropped image of some of the Boks which I published in March:
The weather prediction is for clear skies tomorrow evening, so it’s looking good for the total lunar eclipse, which will last for eighteen minutes, so hopefully a few images to be obtained for my next post!
Feature Image Details
|Feature image date:||2021-05-22.|
|Exposure:||152 min (41 x 223 sec frames).|
|Field of View:||1.54° x 1.01° (up is 48.8 degrees E of N).|
Where is C100 in the sky?
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 of Macarthur Astronomical Society