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Bill S

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About Bill S

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    Star Forming

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  1. I could not resist having a look at my colour (LRGB) Jocular snapshot of NGC 2392. Tried out the various stretch options. With faint distant galaxies I usually settle on hyper but this object is a lot brighter (only 5 second subs). Anyway, I settled on either gamma or log. Log is the one below. Brings out a bit of detail. Mike JW's in mono with the bigger scope and more pixels shows more though. Always good to see different shots and compare.
  2. Martin - I'll put it on the list for a return visit to look for the fainter objects you mention. Bill
  3. This observation started off being about Hickson 56. Hickson 56 is in Ursa Major and I was looking at objects in this part of the sky because it was away from a nearly full moon high in the sky. The components of the group are identified in this shot. The group minus a is also Arp 322. It’s also VV 150. Here's a wider field shot. I noticed another interesting larger object – NGC 3718. I could see a lot more detail because of its size. This is about 52 Mly away and has a bit of an S shape. It’s a barred spiral galaxy but because of its slightly strange shape it was a
  4. A few days ago had a look at VV 85 in Perseus. A closer in view makes it a little easier to see the components. The main component is NGC 1129. I found the labelled picture below which labels this galaxy and surrounding ones, including NGC 1130. Surprisingly a paper by Vorontsov-Velyaminov et al (or more accurately completed in his memory, I suspect, since it was published 6 years after his death) seems to list VV 85 as consisting of NGC 1129 and 1130 as a pair. See: http://images.astronet.ru/pubd/2008/09/28/0001230678/717-959.pdf Other reference
  5. Just to add to the opportunities for confusion and missing things I notice that the abbreviation ShCG has also been used for Shakhbazian compact galaxy group. for example: https://iopscience.iop.org/article/10.1086/307726/fulltext/39976.text.html Alvin Huey's guide to some of these groups is interesting. It may have been mentioned in this thread already. I could not find it so here's the link: http://faintfuzzies.com/Files/ShkGroups v1.pdf Bill
  6. A bit late to the party again. This is a shot from late October 2020. It's pretty sensitive to the type and amount of stretch as shown in the two images with hyper stretch and asinh stretch. So I suppose we need to be careful when making comparisons.
  7. I thought NGC 925 rang a bell. I looked at this back in September and was pleased to find this other Triangulum galaxy. I see from Wikipedia and one other source that it is called the Amatha Galaxy. I have not found out where this name comes from. Any ideas? I also did a quick plate-solve + annotate to see what faint galaxies are in the field. NGC 925 is a member of the NGC 1023 group of galaxies. The group is part of the Virgo Supercluster, which is then part of the Laniakea Supercluster and so it goes on... Bill
  8. I like the look of that. It could be very useful for highlighting star forming regions etc.
  9. Martin - My work-flow has been to do the Ls first and then R, G and B in that order. So, I get a bit of thrill when the first B goes in and the stack miraculously becomes colour. I sometimes add a few more subs of various types if the stack is too faint to see what I'm looking for. I've ordered a clear (but hopefully parfocal) filter to try instead of the L filter to see if I capture a few more photons as I think you suggested in another post. Have you any suggestions for work-flow and relative numbers of LRGB? There's probably some guidance from astrophotographers but I have not been p
  10. Now a couple of Abell planetaries. First Abell 24. This is very faint because it's fairly big and spread out. I really could not see anything with just the mono (i.e. L) subs and it was only when the R , G and B were added that something definitely showed up. Still pretty faint. Maybe one to come back to sometime. Astrophotographers taking much longer have come up with clearer images but that's not what I'm about. If you want something clearer how about this: https://britastro.org/node/20299 Another faint challenge is Abell 21. This is also known as The
  11. A scope without a spider would help or even turning things so the spider vane wasn't on top. I noticed the green flare but did not check it out enough. The problem was that there was some movement during some of the subs, particularly the red and green ones. It was very windy. I've removed the worst and the result looks better. The green flare has gone and the nebula is easier to see. There's a bit of colouring of the diffractions spikes which can't be right but it's EEVA so I'll call it a result. Bill
  12. Returning to Abell 12 (The Hidden Planetary) with LRGB imaging. Pleased that this seems to be worth doing to see a bit of the colour. Another interesting one which seemed to benefit from the colour treatment was NGC 2022. This is sometimes called The Watch Nebula. There's not enough magnification in my shots to show a lot of detail but it is possible to make out a hint of structure in the centre. The central star is said to be more than 120,000 K. It's 8210 light years away. I'll post three more planetary nebula from the a couple of nights ago later. Best regard
  13. Like you, Mike, I was prompted to look at NGC 969 etc. because it is December 2020's Webb Deep Sky Society's Galaxy of the month. There looked to be a few small faint fuzzies in the area between the NGC 974 and 978 so did a plate-solve and annotate. (No I didn't. astrometry.net and ASTAP did...) Great fun! Regards Bill
  14. Abell 12 (also PK 198-06.1) This is sometimes called The Hidden Planetary because it is almost lost within the glare of mu Orionis. It is the Webb Deep Sky Society's Nebula of the Month for December 2020. See this for more interesting information: https://www.webbdeepsky.com/nebulae-clusters/2020/ It's that sphere of haze at about one o'clock under the diffraction spike. Its visibility does depend on the sky conditions. The glare from the star can be worse with more moisture. Could be worth a look another night and may benefit from use of filters. RGB perhaps or an O
  15. Good capture. I reckon you’ve got the central star too (mag 14.8). Bill
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