From: Davide Urbinati <dado_sanna@tin.it>
Date: August 21, 2012 7:00:21 PM MDT
To: "Astro_IIDC@yahoogroups.com" <Astro_IIDC@yahoogroups.com>
Subject: Re: [Astro_IIDC] NGC7640
Fantastic!
Davide urbinati
Inviato da iPad
Il giorno 22/ago/2012, alle ore 02:27, "milton_aupperle" <milton@outcastsoft.com> ha scritto:
Hi Folks;
I went after a deep (Mag 11.8) target - NGC 7640 the "Graphite Galaxy" - last night. Seeing and tracking were very good (Guiding 0.32 arc second RMS and Stars FWHM 2.5 to 3.0 Arc seconds). I was shooting 20 min luma subs too. Each image pixel is 0.83 arc seconds.
http://www.outcastsoft.com/Prototype/NGC7640_20120821_MJA.jpg
The only good images of it I have seen are these:
http://www.wheeland.us/galaxy/n7640_gs.htm
http://obsballona.net/coppermine/displayimage.php?pid=210
http://www.astrofoundry.net/Library/NGC_7640.htm
and
http://www.rdelsol.com/Galaxy/NGC7640.html
all with much larger scopes.
You can just make out the central dust lane that crosses the core and then these bright bluish knots (nebula??) scattered around it. It's an S type barred spiral spiral - but edge on.
If you look carefully, you can see a whole bunch of faint background galaxies (some edge on spirals - others just reddish blobs) too. Most are < 1 arc minute and are in the 15 to 17th magnitude.
It was cloudy today and there is a wave of hazy clouds moving in, so I suspect this will be my last DSO until I get back from vacation.
TTYL ..
Milton Aupperle