11 Sept 2014

SH2-101 Tulip Nebula with colors

This was taken last season but I didn't process this because I remembered that I had no blue channel taken... There was but only about 20 minutes which was less than quarter of the other channels.

Total exposure is:  13 h
                                Ha = 19 * 1800" = 9h 30min
                                R   = 12 * 450"   = 90 min
                                G   = 11 * 450"   = 82,5 min
                                B   =  5  * 450"   = 22,5 min

Full size on Astrobin.

1 May 2014


Final image for this season.

"NGC 6745 (also known as UGC 11391) is an irregular galaxy about 206 million light-years (63.5 mega-parsecs) away in the constellation Lyra. It is actually a triplet of galaxies in the process of colliding.

The three galaxies have been colliding for hundreds of millions of years. After passing through the larger galaxy (NGC 6745A), the smaller one (NGC 6745B) is now moving away. The larger galaxy was probably a spiral galaxy before the collision, but was damaged and now appears peculiar. It is unlikely that any stars in the two galaxies collided directly because of the vast distances between them. The gas, dust, and ambient magnetic fields of the galaxies, however, do interact directly in a collision. As a result of this interaction, the smaller galaxy has probably lost most of its interstellar medium to the larger one.

The age of NGC 6745 is estimated to be ~10 Myr." (wikipedia)

This tiny galaxy has a size of 1,3 arcsec and a magnitude of 13,9.

Total exposure of this is 7h 30min.
                                 L = 22 * 900"
                                 R = 8 * 300"
                                 G = 9 * 300"
                                 B = 5 * 450"

Full size on Astrobin

15 Apr 2014

Arp188 Tadpole Galaxy with 14"

One of the few images for this Spring...

Another shot of this small galaxy. Seeing wasn't too good so I'm not quite happy with this one. Actually the Luminosity channel was better for my 8" SCT taken few years ago. But there was also 3 times more light than this one...

Total exposure was 7h 7,5min
                        RG    =  10*300" (bin2)
                        B       = 9*450" (bin2)
                        L       = 13*1200" (bin1)

Full size on Astrobin

1 Apr 2014


Finally after a long break (mainly because of awful weather...) I got some imaging done!

I continued with this nice barred irregular galaxy.

I had 1h 20min of Luminosity exposures for a year ago and took now 4hrs more, but here's still only 1h 20 of Luminance... Seeing has been so ridiculous that the FWHM was now 4-5.3. Older images has FWHM of 2.6-3 so there was no use for them.

RGB is about 30 min each so that's not enough either but no can do.

Total exposure is only 3 hrs:
                            L = 4*1200"
                            RGB = 5*300/6*300/6*450"

Full size on Astrobin