Thread: Orion widefield
View Single Post
  #9  
Old 28-01-2009, 07:28 PM
Enchilada
Enhanced Astronomer

Enchilada is offline
 
Join Date: Nov 2008
Location: Sydney, Australia
Posts: 753
Post W Orionis : Sticking out like the proverbial,,,,

I like this shot too.
I also note how clearly visible the ultra-red variable star W Ori appears, which is at the bottom centre of the posted image. This star appears brighter than 6th magnitude it appears to the telescopic eye - agreeing almost with the 6.2 of 27th January 2009.
This is a semi-regular variable, whose range can be between 8.2p and 14.2p, but sometimes this is quoted as 5.9v to 7.7v and shines as a carbon star of spectral class C5,4(N5). The mean magnitude for previous data suggest an approximate long period of 2450 days (6.7 years!) It is presently a wonderful time to look for it.
(A magnitude charts is available from the AAVSO at;
http://www.aavso.org/cgi-bin/shrinkw...RI/WORI-AB.GIF )

I have taken a snapshot of this image to highlight W Ori and an identifying finder chart, both being attached below.

Thanks for sharing the image with us.
Cheers
Attached Thumbnails
Click for full-size image (WOrif1.jpg)
71.4 KB17 views
Click for full-size image (W Ori.jpg)
23.4 KB18 views
Reply With Quote