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Mike JW

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  1. Mike JW

    Gassendi Crater

    Just looked at Emma's work - humbled by her skill. Makes me want to try out her technique - no time at the moment. For what it is worth - look at how she does the big dark areas still not lit - she uses cross hatching in two directions - very effective, Also I noticed that for a valley she does pencil strokes parallel to the v shape of the valley and thus fooling us into thinking it is a valley (which it is of course). I think you are well on the way. I wonder if it is all done at the eyepiece? Mike
  2. Hi Martin, I have re posted the Arp 178 shot with two lines indicating the two other galaxies. If I zoom in on my shot, fuzz around the cores can be just detected. Mike
  3. Mike JW

    Gassendi Crater

    Most impressed. You have captured the area well, craters and features are all in proportion. Also enjoyed your earlier post - terminator. Many thanks for the inspiration. Mike
  4. Hi Chris, For what it is worth. As we know law of diminishing returns kicks in. So 18" scope might get to approx mag 17, 24" scope about 17.6, 32" scope about 18.2 and to get to mag 22 need a 200" scope. I always feel that my C9/ultrastar operates at about 3x its aperture, equivalent to a 27" scope, so I could expect to get mag 18 stars. This seems to be the case. My various programs do not give me magnitudes beyond mag 17 and I regularly see stars fainter than this which I suspect are mag 18 (maybe fainter) but then there maybe background galaxies being picked up. The technical guys may have more knowledge. Mike
  5. Lovely. Makes me want to get back to lunar sketching. Life is too short! Mike
  6. April 12th, very clear air but lit by the moon. Two contrasting highlights from last night. Arp 178 in Bootes. This my second attempt at this object. I was keen to pick up the large plume. It is a trio of galaxies. NGC 5614 is the obvious galaxy with the plume. Just below the core is a 'star' which is NGC 5615 and then off to the right is NGC 5613. NGC 5614/5 are about 190 million lyrs away and 5613 is much further out so is unrelated to the pair. 5614 and 5615 may well be merging. NGC 5371 is in Canes Venatici and is a a barred spiral. As the shot developed I enjoyed seeing the regions of star formation appear (knots). To me the bar seems short and not immediately obvious. Apparently 5371 is roughly the same distance as the near by Hickson 68 group. Mike
  7. Hi Tony, Just enjoyed a second read and look through your post. Interested that you have removed the hyperstar. I find the fast, wide angle, tight stars of hyperstar shots fascinating and have been wondering about buying a hyperstar for my C9 but in the end I decided I like the flexibility of using a 0.5 focal reducer. If I wish to get a slightly wider shot I adjust the distance to get f4.4 or even a touch faster. Sometimes I go the other way and use it at f5.5 (current favoured compromise setting). If I am going for the small faint stuff I am not adverse to using the scope at f10. I use to have a f6.3 reducer and sold it, probably should have kept it and then adjust the distance to the chip to operate between f5.5 and f 7. A final advantage of using the 0.5 reducer is that I can be doing visual and then easily switch to a spot of camera work. The f6.3 reducer was great for the same reason. Mike
  8. Autumn 2018 gave me the chance to try the Ultrastar on a driven 24" Dob. The narrow field of view meant it took awhile to locate objects if they were out of the fov. First up is a view through my C9 and then through the 24. Both shots are as seen on the screen. With my new found knowledge it would be interesting to re do them but this time use the mean function and not the sum. Mike
  9. Hi Martin, Thank you for the feedback. Please always free to make suggestions to improve any posting I do or further objects to explore. Arps in CVn - yes I have hunted them all down and many others but as you know from previous postings, since joining the forum I have learnt much, so I shall gradually plod my way back through them to improve them and tease out more detail. As to binning. All the above shots were at 1x1. Often I do use 2x2 binning (probably most of the time) but for the above the conditions were very good and I wanted to maximise resolution. I also tend to use the median 3x3 bypass to get rid of noise and give a slightly softer view that reminds me of my visual days with a large Dob. Mike
  10. Hi, I was out there last night and determined to give Arp 105 another look and use more appropriate settings. Pleased with result. Not as clean or smooth but then I am not using darks etc. The knot is there, the bright end to the tail has a name (see below) as does various other bits. Did not pick up the Quasar, although in the noise there is a bit of grey that might qualify? I quite fancy another crack at this object. Cheers Mike PS I also looked at 3993 and 3501 - may post them later.
  11. I have visited C.Vn a few times of late so here is a collection of results. C9/Ultrastrar Mono M3 - enough said, but I do like to visit a globular - would love to be on a planet in the middle of that lot until I think about the gravitational chaos there must in a globular. 3 x 5sec subs. M94 - AKB's post on April 2nd inspired me to take a look and take a step of faith to see the ring. 6 x 15 sec subs Hickson 68 A (NGC 5353) and B (NGC 5354) , both lenticular galaxies, are the two close together and interacting? C (NGC 5350) is the lovely barred spiral to the right of them. Circled at the top are NGC 5358 (spiral) on the left and NGC 5355 (lenticular). Circled to the right of 5353/5354 is PGC 99754. 11 x 15 sec subs. Arp 23 NGC 4618. This is classed by Arp as a One Armed Spiral. Clearly seen is its central bar. Just sneaking into view is NGC 4625, also a one armed spiral but not noted in the Arp list. ARP 193 IC 883. It is a merger remnant. Arp classified it as a galaxy with narrow filaments. Pleased to have picked up the two filaments. A very peculiar galaxy. 20 x 10 sec subs, Arp 269. NGC 4485 and 4490. Classed by Arp as having connected arms. I have not picked up a connecting arm. NGC 4490 is the big galaxy, known as the Cocoon Galaxy. The near collision has distorted it and fired up much star formation. 4 x 10 sec subs. I have had some fun and pleasure wandering about in C. Vn. There are 14 Arps in total in this constellation. Mike
  12. Virgo is a wonderful hunting ground. Mike
  13. Hi Martin, Cracking observation. Needless to say my shot from earlier this year lacks your detail but I did pick the three cores of W1419. I think I should probably re visit all my Arps and start again - fun stuff and fascinating. Thanks for the inspiration. Mike
  14. Hi, I should have commented on 4503 as well - I am a bit focused on Arps. I have just looked up my big dob records for Virgo. I last looked at in May 2015 and as usual saw a central core and a bit of grey fuzz surrounding it. Now I know what it really looks like. I think it is a wonderful project to visit all the mag 12 and brighter objects. I did the same with the Dob but never completed it due to lack of clear nights and time. Good luck with your tour. Mike
  15. Hi, Nice to see the wider context for Arp 175, which I visited earlier this year. I offer my shot of Arp 175, which if doing again would be better, after all that I have learnt in the last fortnight or so. My shot is upside down compared to yours. Next time I would hope to pick up the narrow counter tail. Mike
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