Imaging challenge:- BBWo 147 Planetary Nebula?

sjastro · #1 06-09-2011, 02:30 PM

Also known as Bran 147 A/B, I imaged this a while back but was not satisfied with the final image.
This one is far superior as it reveals more than the lobes.

Astronomers are uncertain if it is a planetary nebula.

This is one extremely faint object, the V magnitude surface brightness is fainter than the naturally occurring skyglow at a dark site. The R magnitude surface brightness however is slightly brighter.

8.5 hrs L=R, 1 hr R, 1 hr G, 1 hr B, BRC-250 scope, ST-10XME CCD.

http://users.westconnect.com.au/~sjastro/bran147c.html

Clear skies

Steven

Alchemy (Clive) · #2 06-09-2011, 02:41 PM

Interesting, perhaps one way to tell might be to capture some O111, there is a faint blue star in the middle which potentially could be a candidate.

I have to hand it to you Steven, you certainly do manage to get out and do some different objects, this is right out here at the limit of amatuer type work.

Any links to info on this object from the professional observatories?

Lester · #3 06-09-2011, 02:59 PM

Exceptional catch of such a faint object. Thanks for the view Steven.

desler · #4 06-09-2011, 03:25 PM

Remarkable capture.

Darren

sjastro · #5 06-09-2011, 05:17 PM

Quote:

Originally Posted by Alchemy

Interesting, perhaps one way to tell might be to capture some O111, there is a faint blue star in the middle which potentially could be a candidate.

I have to hand it to you Steven, you certainly do manage to get out and do some different objects, this is right out here at the limit of amatuer type work.

Any links to info on this object from the professional observatories?

It's an obscure one Clive.

There is not much info available.
There is this, where Bran 147 A/B is listed as RCW 24.
http://articles.adsabs.harvard.edu//...01082.000.html

Quote:

Originally Posted by Lester

Exceptional catch of such a faint object. Thanks for the view Steven.

Thanks Clive.

Quote:

Originally Posted by desler

Remarkable capture.

Darren

Thanks Darren.

Clear skies

Steven

mill (Martin) · #6 06-09-2011, 05:38 PM

Very nice catch on such a obscure object

sjastro · #7 06-09-2011, 05:48 PM

Here some info on the object.

Size:- 8 X 6 arcmin.
Magnitude > 14.
Surface brightness Vmag/arcsec^2:- 16.0
Surface brightness Rmag/arcsec^2:- 13.5

Skyglow from a dark site is typically 13.0 Vmag/arcsec^2

RA:- 08 25.8 Dec:- -40 13.

Regards

Steven

sjastro · #8 07-09-2011, 08:31 AM

Quote:

Originally Posted by mill

Very nice catch on such a obscure object

Thanks Martin.

You have an excellent NGC 253 image posted.

Clear skies

Steven

atalas · #9 07-09-2011, 11:18 AM

Great work Steven.....any idea why astronomers aren't sure If It's a PN?

sjastro · #10 07-09-2011, 03:44 PM

Quote:

Originally Posted by atalas

Great work Steven.....any idea why astronomers aren't sure If It's a PN?

Unfortunately Louie my information on astronomers doubting that the object is a planetary is based on 1997 information.

The brighter lobes were mistaken as two separate HII regions.

Today there is no doubt the object is a planetary courtesy of deeper imaging revealing the regions are part of an overall structure.

http://cdsarc.u-strasbg.fr/viz-bin/v...7A&G258.5-01.3 (Thanks to Sakib Rasool for pointing this out.)

Clear skies

Steven