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About callump

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    Tewkesbury, UK
  1. i have the desk edition of the Interstellarum Deep Sky Atlas -and it is my 'goto' atlas these days. The page organisation and the way it has been annotated make it a joy to use. I use it mainly for building observing lists, and don't take it out the field. I have a fair few number of atlases, but none other makes it off the shelf these days, except on occasions my Pocket Sky Atlas or 1950's epoch Notron's. Callum
  2. Sorry, yes you are right (though I am sure when I last looked for one there was - but that may be several years ago). I guess more accurate to say client neutral. I expect most INDI users use some sort of appliance on the telescope, and whatever client platform of preference. Alpaca will no doubt provide a practical similar solution some time in the future... Callum
  3. People might find this YouTube video of Bob Denny (one of the Ascom/Alpaca driving forces) useful - especially if you know nothing about Ascom or Alpaca. https://www.youtube.com/watch?v=Qd1ZsJ_Q1XY Its a while since I watched it, but I think the essence is that Alpaca is not really there yet... And whether it ever will be is moot - it may get somewhere, but will never have complete cross platform support. At the moment I think INDI is the only complete cross platform that actually works. INDIGO is good if you want to use Cloudmakers apps, and it also falls back to INDI too but there's not much in the the way of third party clients. Callum
  4. There is a table in the Astrometry.net README that gives the range of the skymarks for each set of index files. If you know the size of your field, you can just use the height in arc-minutes to work out a range of index files you need. E.g. for a 30 arc-minute image you might want to use: index-4205-*.fits 11–16 index-4204-*.fits 8–11 index-4203-*.fits 5.6–8.0 index-4202-*.fits 4.0–5.6 /callump
  5. The renowned American astrophotographer Adam Block will be presenting at this weeks BAA Wednesday Webinar, on the "Interpretation of astronomical images". Adan is an astronomy researcher at the Steward Observatory, Arizona, and was the founder of the stargazing programmes at UA Science Mount Lemmon SkyCenter. He had a regular column in Astronomy magazine, and his images frequently appear in the astronomical press. He has several APODs to his name, the most recent being May 11th 2020- Behind Betelgeuse. You can view many of his splendid images at: https://www.adamblockphotos.com The webinar starts at 7pm. Open to all - Zoom and YouTube links at: https://britastro.org/node/24212 Callum
  6. The problem with Preview seems to be something to do with the MacOS quarantine system. All the files downloaded have an extended attribute marking them as quarantined. You can remove the quarantine attribute - but I found that even if you do that it comes back as soon as you select a link in the PDF. I tried a few things (like making the files read-only, owned by root, even re-writing the files using Ghostscript) but none of these seemed to help. Possibly you have to downgrade much of the MacOS security subsystem to get this to work with Preview - so it seems easier just to use Acrobat. Callum
  7. I'd say reduce the length of the PFTE pads - the more surface area in contact the more stiction. Once smaller, you can also adjust the position of the pads to achieve a nice feel. Looking good - nice to see the old scope 'reborn'! Callum
  8. This weeks BAA webinar is on observing occultations with Tim Haymes, from the BAA Asteroids and Remote Planets Section. Wednesday, 30th September at 7pm. You can join via Zoom or watch on YouTube. Open to all - details at: https://britastro.org/node/24212 Look forward to seeing you there. /callump
  9. Hi Toedeh, I started with an ASI290MM mini camera for EEVA as it was what I had (i'd bought it for guiding). Here is a pic I took with it of M82 - this was my first go at EEVA so did not know what I was doing at all! The tech details are: Celestron C11 with F6.3 reducer Losmandy G11 mount ZWO ASI 290MM Mini camera Indigosky Raspberry Pi Cloudmakers Astroimager and Astrotelescope Processing using Jocular Stack of 10 sub-exposures of 10s The ASI290 has quite small pixels - 2.9 microns - and the chip is quite small, so after much deliberation & dithering and in the end not really being able to decide, i plumped for an ASI174MM mini. Which has bigger 5.8 micron pixels and a bigger chip (so able to get a wider field). Here is a pic of NGC 891 I took recently with the ASI174. M82 is about 9 arc-minutes long, and NGC 891 is about 13 arc-minutes long. I have cropped the NGC 891 image square to be about 14 x 14 arc mins in size, as I am currently getting awful edge effects. I'm not sure it will help your decision process really - it is worth trying out field calculators to see how big a field you will get with whatever scope and camera combinations you like, and what sort of objects you are interested in observing. Also to some extent it will depend on how much you want to pay for the camera. Callum
  10. I like a diffraction spike when it is a real diffraction spike (like here!) Callum
  11. You could try Cloudmakers Astroimager http://www.cloudmakers.eu/astroimager/ which is a native MacOS app. It supports the Altair cameras but probably in the same way as INDI so might not recognise the camera if the problem is with the Altair driver. There is a free 1 month trial. Version 3 is currently the one that downloads, but there is a development version V4 available that does live stacking and sequencing (I have not tried it at the telescope yet, though). Callum
  12. Hi Martin, internet images show the nebula as mostly blue - i guess it is fairly old. Your blue central star looks like a good candidate for the central star! There is a PN Jones-Emberson 1 which is in Lynx - looks like a good target too, when it comes round. Callum
  13. Last night (2020-09-20) was not the clearest of skies, but I managed to capture a few galaxies. NGC 404 - AKA Mirach's Ghost - was actually easier than I had expected... NGC 891 - the Silver Sliver galaxy NGC 507 and NGC 507 Group of Galaxies V V 209 With the astrometry.net annotated view. Finally an oddity, marked on the Interstellarum Deep Sky Atlas - Barbon's Galaxy. Discovered by Roberto Barbon in the late 1960's i think. It was highlighted to him as a faint smudge on a plate - Barbon took a spectrum to reveal it as a galaxy. It is a Blue Compact Galaxy - if the conditions had been better I might have tried an LRGB to see if it had a blue excess. Callum
  14. Another target I have been try to get for a few nights. Mayall II is a globular cluster of M31, sometimes catalogued as M31 G1. It is the only GC of M31 that appears non-stellar. It is thought to be about twice as massive as Omega Centauri. Actually it is quite easy to find - there is a an easily identifiable group of three stars - G1 is the leftmost of those as shown on the following: There is a fuzziness to it that the stars do not possess. There is a nice list galaxy to the left - UGC 330 - I could not find out much information on this, though it does appear in a few papers. Callum
  15. I tried to find Jones 1 in Pegasus a couple of weeks back without success. I persisted with locating it last night, but even with 30s exposures there was just a hint of it 'live' on screen. Registered and stacked it is a bit more obvious in this result. It was toward the end of last nights session and the sky was deteriorating - will try again if/when we get a better night... James 1 was discovered in 1941 by Rebecca Jones at Harvard. Callum
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