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Everything posted by Atacamallama

  1. Many thanks for the input, and I can confirm that I shall be using Pixinsight. Looks like I can make things most simple for myself by putting the core in one frame.
  2. Greetings all, I am gearing up for a project: an LRGB (poss +HA) of the Andromeda Galaxy. FWIW my gear is: AltairAstro Altair Wave 102 F7 Triplet Atik460 Mono operating in Spain remotely. My question is, for the core of the galaxy I am presumably going to need a shorter exposure than for the rest of the object. How do I accomodate this when doing a mosaic? Would it be best to get the whole core in one frame and use a lower exposure for that. Or if the core is split over more than one frame, with some frames containing Core + outlying areas - how should that be acommodated? I have attached a putative capture screen (from SGP) if that gives any ideas on what I should do. TIA for any input
  3. Thanks for that, sorry not to reply sooner, didn't seem to get notification of your message. I intend to get back to tweaking it soon. BTW will be in Warsaw for a conference next month!
  4. Rosette nebula in Hubble palette 45 x 900 sec HA 49 x 900 sec OIII 26 x 900 sec SII Processed in Pixinsight
  5. Call me stupid but I have a feeling either my filters are in the wrong place, or for this data set I missnamed the filename suffix for the filters in my picture taking software (in this case Sequence generator pro). With reference to the attached screen shot: The picture on the left is a very fast process of the tulip nebula with (according to my suffixes and FITS headers) HA as green, Sulfur as Blue and Oxygen as Green. (i.e. sulfur and oxygen are swapped). Image 4 is what I thought was a hubble palette, HA as green, Sulfur red and Oxygen blue) but it is "reversed" according to the hubble tulips I have seen (ie what looks blue should be the yellow colour and vice versa). I have added the Oxygen and Sulfur channel pictures (sulfur is "Sd" and Oxygen "Od"). My first thought is that in setting up an SGP sequence I misalloclated the suffixes so that in fact what is labelled Sulfur is actually oxygen and vice versa. Presumably this means that in integrating they have picked up the wrong flats, if I am correct in thinking the sulfur and oxygen are misnamed? Incidentally, this is a remote set up so it is not straightforward to physically check.... TIA for any light shed....
  6. M27 in OIII and HA. Shot with Altair astro 102 F7 Triplet, ATik 460 EX Mono. 34 x 900 secs HA, 58 x 900 s OIII.
  7. Pelican Nebula in SHO, Altair Astro 102 F7 Triplet, Atik 460EX Mono, 32 x 900 secs HA 18 x 900 SII, 20 x OIII. Processed in Pixinsight.
  8. Thanks for the answers, I'm still waiting for the on site people to get back to me (this is a remote set up).
  9. This problem seems to be developing, here are some more subs with this and other artifacts also appearing.... https://www.dropbox.com/sh/h2qzjksydjuh3rn/AACnuNXg3zTpUlDQZ1p7rdSla?dl=0
  10. Thanks for the answers everyone. There is no OAG on this, and it does appear on all the subs, this is not a one off. It just appeared overnight. It seems a bit severe to be a dust bunny... there are other dust bunnies in there but they don't show up under these conditions (this is just an STF stretch in p/i). C
  11. An artifact has started appearing in my subframes. Here is an example of one frame, 900 secs in OIII on the Jellyfish. I have just given it the STF stretch in Pixinsight. I am talking about the dark area at "3 o'clock" on the edge of the frame. It is not like my usuall dust bunnies (of which there are some, but they don't show up under this stretch) My equipment is 102 F7 Triplet, Atik 460 EX Mono and Paramount MX Mount, operated remotely. TIA for any input.
  12. Further to my last, your reply prompted me to investigate the FITS header and it looks as if I didn't have the cooler on when I took the darks...
  13. Thanks for your reply. That particular problem will not apply to me because these are all with a CCD, but I am wondering if there might be problems with the darks. I've put the masters in the dropbox folder as well, now. They *seem* to be ok to me. Many thanks
  14. Have been running BPP to produce calibrated files and the results are really bad. Here is an example for a pre and post calibrated file: https://www.dropbox.com/sh/yxap96jc11y81be/AAA4N8sfiRBy_qemidNlWdPxa?dl=0 The master flats/darks/bias look fine, so is there a setting I'm getting wrong for calibration? I've run some tests by calibrating manually and am still getting the same problem. I have tried calibrating just using Darks/Bias/Flats to see where the issue lies and it seems that calibrating just with Darks gives a good image but issues arise with Bias and even more so with Flats. TIA for any imput.
  15. OK, this is the teaching that has led me astray on this issue.... http://www.lightvortexastronomy.com/2013/02/tutorial-nebulae-pixinsight-workflow.html I'm currently wrestling with some data on the Pacman nebula, here is what I have so far using the HA as luminance method, but have not done any deconvolution : http://www.astrobin.com/full/224989/0/ Many thanks.
  16. Thank you ChrisH, I shall bear in mind what you say about HA luminance, and have a go at deconvolving (deconvoluting?) all 3.
  17. I'm making my first attempts at doing deconvolution on and have a question at this point. I'm doing a SHO project and intend to use the HA as luminance as well as colour channel. My question is: what image to do deconv. on? All three, SHO? Or just the H qua luminance? TIA for any input
  18. Ok, I have now aligned two files closer in time, in fact two consecutive frames, the last of A1 to the first of A2, there is about 20 minutes between their starting times (remembering they are 15 minutes subs). As we can see they still show the effect. Does that have implications for the polar alignment/rotation suggestion?
  19. Double take here... then surely the same would happen between subs on the same target that much time apart...???? i.e. they would have rotated that much?
  20. thanks for that, they are 900 sec subs, about 2.5 hours apart.
  21. I'm collecting data for a two panel mosaic of the Soul Nebula and thought I'd check to see if the subs do align. Unfortunately I can never tell just by eye where mosaic panels go, so I did a trial align on two subs (in HA, FWIW). Using register union/mosaic in Star Alignment in Pixinsight. They do fit and I assume would be useable when cropped, but they are off by a few degrees, and I can't understand why - or if this is a PI issue or a data collection one. I used the SKY mosaic function to collect the subs. I've taken a screen shot of the sky mosaic screen, and one of the two "aligned" subs. Anyone have an idea what could be going on? TIA for any input.
  22. Took this image a couple of months ago with astrotrac, Bork and Canon rebel. Just given it i a quick stretch, cropped to the main business and saved to jpeg to save space. We obviously got something wrong in alignment or there was a screw loose in the mounting, you can see the stars are all elongated. My question is can some processing save this image? My preferred processing software is Pixinsight, though I also have photoshop. TIA for any input.
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