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johnh

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Everything posted by johnh

  1. Hello Chris, there is no problem with tube flexure, I use an OAG for imaging making things way easier. Provided the telescope is well balanced you can approach payload limit. When I used a guidescope I was over the payload limit again with no problems. EQ8 is generous with twice the payload limit - a much sturdier mount altogether. Regards, John.
  2. Thanks for the comments. My big white monster on the EQ6 rests very nicely and guides well. Here in Brisbane dew is a problem so I have a big DIY blue dew shield. I must be near the maximum payload. Regards, John.
  3. SPX350 F4.53, ST10XME, Astrodon filters. Some bright interesting galaxies in Sagittarius, Fornax down to Canis Major. NGC1097 has 2 jet emanating from the bottom and bottom right of the galaxy. Barnard's Galaxy 6822 is 1.6 mil lyrs away full of HII regions. NGC2207/IC2163 are 2 interacting galaxies 110 mil lyrs away with 2207 stripping of material from ic2163. There have been 4 supernova since 1975. Regards, John.
  4. SPX350 F4.53, ST10XME, Astrodon filters. I have not imaged for a while but here are some Southern galaxies from Brisbane. N Hemisphere has bigger galaxies but the South has many medium sized galaxies. NGC247 mag9.1, 11 mil lyrs NGC300 is the Souths equivalent of M33 at mag 8.1 6 mil lyrs away with large HII regions. NGC1398 is a flocculent galaxy where its spiral arms merge together. Mag9.7, 80mil lyrs away. NGC1512 is interacting with another galaxy so has a spindly arm stretching out. Mag10.3, 38 mil lyrs away. Regards, John
  5. SPX350 F41.3, PGRFlea3, Baader RGB filters. MARS PROJECTION I managed to get all the way round Mars during May at its closest so I put together a Projection using WJupos, Analysis- Map computation and layered all of them together to get the full 360 degrees in Photoshop. Tools-Ephemerides-options allows a video rotation which I put on Flickr. https://www.flickr.com/photos/40231940@N03/29025308341/in/dateposted-public/ Regards, John.
  6. That's looking amazing, banding really easy to see. Specialist filters seem helpful with Uranus. John.
  7. Those Neptune images look very interesting especially the W25 image. You need such good seeing for Uranus and Neptune but detail is possible these days if you persist. Uranus is getting higher for Northern observers too. When I started astronomy in 1986 Pluto, Uranus and Neptune where all in the same place - Sagittarius area, all but impossible then. John.
  8. SPX350,PGRFlea3, Baader RGB filters. Mars F41.3 Saturn F34.5. Seeing was vgood on 19th with the image just vibrating on screen a lot of the time and this was repeated on 21st which was almost as good. Seeing between 8-9. After finishing with Mars I moved to Saturn and it looked mighty fine. After processing even the blue showed a hint of Encke div. Saturn on 21st showed detail with usual Dark Spot in North and light spots near equatorial region. Pity seeing like this came at the end of planetary season but it is appreciated. Regards, John.
  9. Those are impressive Neil for very low altitude. To get any albedo on Mars with edges and banding on Saturn. Surely now begging for an ADC to accompany? John.
  10. Hello everyone ,apparently this Saturn dark spot has been around since 2014 (N63.6 latitude) - I have not been paying much attention to Saturn for few years. My Mars projection looks way better than 2014 effort with plenty more detail so 2018 will be great for Southern observers. John.
  11. Great images, you can really see it moving. John.
  12. Thanks for the comments, I am told observing using an UHC (Ha OIII broad pass bands) filter makes the pair look like cosmic traffic lights as the red primary and the green/blue secondary contrast better as brightness difference is reduced and seeing is improved slightly. John.
  13. SPX350, PGRFlea3, Baader RGB filters. Mars F41.3 Saturn F34.5. Seeing was predicted to be good but I found it variable and on 3rd waves of terrible seeing took over bending Saturn and making it all but disappear through turbulent defocusing. Seeing managed to settle to near good for half an hour for Saturn where a dark spot was seen near the North pole shown in the GIF. Mars phase is increasing and albedo is not as contrasty, I have had a good trawl this season so I should be able to make a projection of the whole of Mars now. Regards, John.
  14. SPX350 F41.3, PGRFlea3, Baader RGB filters. Imaged from Brisbane, Australia. This double is tricky at 2.72" separation, the 1st and 5th mag stars are not the only difference because colours of red/orange and blue make a pleasing contrast. This is my best image of the two as the colour of the companion is obvious as seeing was good. Orbital period 1200-2600 years and separation 503 AU. Regards, John.
  15. SPX350, PGRFlea3, Baader RGB filters. Mars f41.3 Saturn f34.5 We had nearly 3 weeks of rainy weather here in Brisbane but I got a couple of clear nights with JetStream very strong but seeing was not that bad. Mars is getting a bit smaller with a strong phase developing. I may get the weekend 2/3 July to take possibly my final Mars 2016 images. I managed a GIF sequence of Mars as well as a quick Saturn but nothing special. My scope only just cools down before I start to image using the mirror fan, it takes about 90mins. I now image right after twilight ends. I now have enough im
  16. With FIrecapture Neil there is an algorithm designed by Emil Kraaikamp which shows if higher bit rate is better above 8. Usually only Venus or possibly the Moon is able to use higher bit rates (where the sky has no noise) but planetary/lunar mid tones don't usually benefit only faint Solar prominences against black sky is worth higher bit setting. John.
  17. Yes Neil the ASI174 (1920x1200-5.86micron) is a bigger chip than the 618/Flea3 and the expensive Grasshopper 3 (the best planetary CCD) is 3.2 million pix (IMX252-2048x1536-3.45micron). Bigger chip is great for whole Moon mosaics. With Flea3 I use 16milli sec-62.5 fps for Mars you can go higher with F3 to 120fps, many with new CCD's are doing 75fps+ with little noise at 0.1 "/pixel. John.
  18. Thanks everyone, weather has turned ugly now for a week or so. Neil there are so many new CCD's available some one shot colour too. I just felt I would leave it for a while at these ccd are only about 10% more sensitive or so, the main improvement is low noise, the ASI120 is about the same sensitivity. I like the ASI174 it has similar pixel size, there may be more sensors out in the coming years, so I have been thinking about it but the F3 is so good especially in IR - perhaps it is just laziness. For Mars 2018 (24.3") I may decide to change over? John.
  19. SPX350 F41.3, PGRFlea3, Baader RGB filters. Managed 3 nights with Mars with near to good seeing on the 9th. Managed to get Olympus Mons + volcanoes and Elysium areas. Seeing was variable but did settle. I put together a GIF of Mars on the 9th. I also got a reasonable Saturn with equatorial dark patch moving red channel in the GIF . Regards, John.
  20. SPX350 F41.3, PGRFlea3, Baader RGB filters. Managed Mars at its peak size of 18.62". Seeing looked average with some slightly better seeing so I was amazed at the detail I got as the preview looked not too good. The first time I have got Syrtis Major so far and the massive Hellas crater below SMajor is also visible. GIF of red channel taken every 20mins, you can see Hellas crater clearly. Mars is appearing earlier and earlier and it is getting colder here in Brisbane but weather has not been too bad so far. We are definitely picking up more detail than in 2014. Thanks fo
  21. SPX350 F41.3, PGRFlea3, BaaderRGB filters. Another clear night with decent seeing, trouble was patchy cloud kept disrupting seeing before it flooded in ending things. I got a few steady images and some GIF animations. The first time this season I have seen Sinus Sabaeus, with Syrtis Major just moving off the disc. Thanks, John.
  22. SPX350 F41.3, PGRFlea3, Baader L filter. With good seeing I thought I would try imaging Phobos at 11th mag which has a rotation of 7hrs so it is a fast mover. I had to Binx2 images and max out gain at 13fps every 15mins or so, I could see Phobos in the preview. Unfortunately cloud came in stopping me getting more avi's of the moon changing its direction. Regards, John.
  23. SPX350 F41.3, PGRFlea3, Baader RGB filters. Another good night which started off wobbly before settling down pretty close to yesterday's seeing. Mars shows a white patch at the bottom of the disc which is the Argyre impact crater that possible formed the Elysium volcanoes in the ancient past. The Shiaparelli crater is also visible on the right side. Mars seeing deteriorated so I moved to Saturn and after a while seeing really improved and for one good set. The sharpened IR GIF showed moving patches on the equator. It will be cloudy for next few days here in Brisbane. Regards
  24. SPX350 F41.3, PGRFlea3, Baader RGB filters. My imaging on 11th and 12th was avg and below avg and the bad seeing hung around for a few days with bright stars winking on and off. On the 15th the seeing was now much better significantly above average but a bit wobbly and would not settle but on 16th seeing was good and fine detail could be seen in the preview with occasional soft moments but this is the best seeing I have had so far. Unfortunately a cloud band appeared from nowhere only giving me an hour to get 6 sets which I put together in a GIF - no time for Saturn unfortunate
  25. Very pleased you got good seeing Neil and nice moon detail too. Your scope seems a handful after Orion Optics scopes but it seems to push detail that bit further. Although those Jupiter images you got back in 2012 or whenever will be difficult to beat. John.
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