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Everything posted by SilverAstro

  1. Oooops, I think 1400 is a bit ambitious ! I think I need a faster computer
  2. I have been experimenting with 2sec exposures, Canon 60D + vintage 135mm lens, on a fixed tripod. Originally to track down some faint asteroids but I got sidetracked into imaging my first galaxies, not intentional ! Nothing pretty here but quite interesting. A stack of 100 when vigorously stretched has revealed the Leo triplet (just!) way down in the noise with stars down to mag12 (13 with good luck and imagination !) Why am I finding this interesting? well if there was to be a supernova in a galaxy of similar surface magnitude I stand a chance of capturing one, since SNs outshine (usually?) their parent. Below is my less than pretty pic, the full frame on the top left with beta Leo far left and the area where the triplet are in the top right corner. This corner is enormously stretched and scaled up a bit indicated by the yellow lines. With a larger annotated version below. The compression to jpg has not helped ! they are still there but are clearer in the original TIFF in Gimp. EDIT : the magnitudes are from CdC / UCAC4 Now for my question :- I have approx 1400 more to process from last night in batches of 100, do they all need to be stacked in DSS at the same time or can I stack them in groups and stack the group TIFF images in DSS again to make the final ? Will the s/n ratio still stack up ?
  3. According to CdC there is a mag12.42 foreground star at that location, UCAC4-729-048667 and in the image it is of similar magnitude to the nearby (just to the left of M 108) UCAC4-729-048661 also 12.42 in CdC. Looking at google images of M 108 it does not appear that prominent. So it did look like an 'interesting' candidate ! (of course it was cloudy here, but thanks for the heads-up anyway ) Here is a little animated gif I just made to show that it does appear to be the foreground star ??
  4. I think because that is when the Virgo and Coma clusters come into convenient view ?
  5. Oh yes, M44 good thinking ! with little M 67 not far away and close to Alpha Cancer. A bit off topic : first I will be going for asteroid (51) Nemausa, mag11-ish (between Regulus Alpha, and 31 Leo ) a second time to confirm from a week or so back. And I have just noticed (45) Eugenia near Denebola Beta Leo. So I'll try for that as well at a similar mag.
  6. I was wondering the same thing for tonight. but those Messier are going to be a bit small with a 200mm lens though?? Assuming a DSLR.
  7. DSS is not handling my Win7 display setting. For DSS to display correctly I need to select "Smaller" (in Control Panel) , if I use "Medium" (preferred for my eyes in other applications, bit of a hassle to have to reset and reboot everytime to run DSS ! ) then the histogram plot overlaps and obscures some of the slider ranges, and (not so important) the Reset button. There is space to move the histo plot to the right (into empty space) but I cannot see how to do that ?
  8. This is the best only good reason I've found so far to join titter/book, I think we should all go spreading this 'true' news
  9. Au contrair ! I like it, glad you posted. It is all about finding out and learning, what's the phrase something like "It's the journey that counts not the destination " ? I like it when I am trying things out and find something I was not expecting, like when I was trying out my dslr with 135mm lens on Regulus and practicing stacking,, when I discovered I had imaged asteroid 51 Nemausa close by I love serendipity !
  10. I think it might suffer some serious diffraction effects. I know 'frac owners are often jealous of the pretty stars that newt owners get, but that is taking things a bit far d'u'think ?
  11. Yes, I meant doubly interesting, obsy and planty Or even threeways interesting - as a foldback cover ? Food (pardon the pun) for thought !
  12. Interesting, thanks, I missed this first time. You could re-post in the Chilli topic as well !
  13. Yes me too ! Looks very interesting but it is a heck of a page ( I cant fit most of it on my monitor ), my head hurts !! Anyone found a summary of, abstract of, or principles of what is going on !
  14. You were on the right track, the online manual for the firmware -one before my firmware says, Setup>Hand control > 5 options for brightness and beep volume, mine only has 4 options - no beep vol. The online manual for firmware +two above mine has only 4 options - no beep and no ref. to a long beep at 2nd star. No manual yet found for my firmware but reasonable to assume it was removed, so that's ok then, I will puzzle no more! Thanks for focusing my brain cell.
  15. Thanks, good thinking, I had not noticed anything in my manual, but just now discovered a more extensive version on line, I'll have another look.
  16. I have acquired an old (non WiFi ) Discovery mount. Doing a Brightest Star Alignment the book says that it should emit a long beep when it slews to near the invited 2nd star. Mine does not beep but otherwise all seems to go to plan. Does yours beep? Perhaps I am missing something? Maybe a manual written for old firmware? Or maybe I have a problem ? ! I've not used it outside yet (no stars!) but practicing indoors to imagined positions seems to go to plan when I compare the reported position with what Stellarium is telling me.
  17. For a long cable run it is worth doing an inventory of loads and considering a 3-core or even 3+ 'earth'. Heavy but non voltage crit. loads like dew heaters, fans etc. can be fed from one side whilst the usually lighter but sensitive load is fed from the other side with its consequently lower voltage drop.
  18. what a build-up! as I'm reading I am thinking ohI ,,, PREMIUM,, medical ,, ahem ow much is this going to ,,,, OH, knock me over with a feather that bottom line isnt going to break the bank is it Looks good.
  19. Not a Heads-up alert as such any longer so I suppose I should do this in the "Variables" section ? Consensus on AAVSO has it about mag10 now. To see it again here would be a fine thing, and 4cast for next week is not good neiver
  20. The portable by Partha imports Canon CR2 (and probably lots more) raws, using (I think) UFRAW, all in the one package, which saves a lot of messing about! (unless one wants to go the DCRAW route for specific needs) The Samj build will see RawTherapee and Darktable but they need to be installed already
  21. Yea ! Gotit !! For once the cloudGods cooperated, had to go portable and dodge a hedge (either it has grown remarkably or Sirius is no longer in its winter aspect !) but it was still a bit down in the murk. Not an expert at estimating fine magnitudes but I think it is a fair bit brighter than my title said (now edited),,, maybe 10.5 >10 ?
  22. Anyone who likes to try portables before installing, two versions are now available : at Partha's Place (64-bit) https://www.partha.com/ and direct link to the file https://www.partha.com/downloads/Gimp-2.10.0-std-64bit-portable.exe .... and on Samj's blog (two versions 32 & 64 in one ziped file) https://samjcreations.blogspot.co.uk/ direct link http://www.aljacom.com/~gimp/GimpEval-2.10-Win.7z
  23. The light curve looks like the first two oscillations of a damped impulse, I wonder if it will continue like that.
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