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About callump

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    Tewkesbury, UK

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  1. Welcome @Cosmic Monk Too many years ago I visited San Diego and had great night out at Tierra Del Sol with SDAA.
  2. I think the main problem with direct control of motors is that the RPi is running som variant of Linux which is not really very good for real-time control - your motors could get pre-empted by some other process, and then any tracking would be lost... The GPIO indi driver is probably best for switching relays, doing dome contol, or telescope cover opening, or the like... Probably your best approach would be to use OnStep to control the motors. Alternatively you could look at the new Raspberry Pico, which is more like an embedded controller - but you would need to write some software
  3. Thanks - i may give that a try... Interestingly I was able to 'stack' a single file of the set of registered fits files (using Siril), just not the Siril stacked file. Maybe there is something in the FITS header Affinity does not like... /callump
  4. I had tried this (and just tried again), but nothing seems to happen when pressing Stack, and the Apply button does not get activated. I was able to load a set of calibrated and registered lights (no darks, etc), and stack those. /callump
  5. It's a pity it does not open just a single fits file - unless anyone has worked out a way of doing this? /callump
  6. At this week's BAA Wednesday Webinar (7pm) we welcome Dr. Jacqueline Mitton to talk on "The astronomer Vera Rubin". Vera Rubin was one of the most important astronomers of recent times who discovered the 'galaxy rotation problem' which is taken to be evidence for dark matter. The Large Synoptic Survey Telescope (LSST) was formally named the Vera C. Rubin Observatory in recognition of her work. Full details at: https://britastro.org/node/25416 Open to all - available on Zoom and live streamed to YouTube. Callum
  7. I have tried a wireless extender in the home, but it did not extend far into my back garden (a TP-Link). It was also a bit unsatisfactory when connecting to different devices, so in the end I abandoned it for a mesh solution (BT). I have a very long back garden, so I actually set up an external wireless access point (Ubiquiti Picostation) half way down the garden which is hard-wried to my router. It is powered by power over ethernet (PoE), so all self-contained. This access point gives me a range of about 50m but this model is only 2.4GHz band. There are probably newer dual band versions
  8. Hi Martin, Coincidently I have Magakian 82 (GN 04.41.8) on my observing list, but not had a chance to observe it yet. I did some light research, and both the Magakian and Galactic Nebulae catalogues have a lot of interesting things to look at. I noticed it when browsing my Interstellarum atlas, which notes it as Magakian 82. Cheers, Callum
  9. Should you not precess your measured coordinates back to a common epoch (J2000) anyway? Callum
  10. I use Simbad a lot, and it can be quite hard sometimes to find the correct catalogue reference (e.g. Abell PNe use A66 <number> or PN A66 <number>) For the various Shakbazian references, you just need to use ShK <number> Callum
  11. This seems at odds with: Applicants are required to be a member of an affiliated organization, such as an astronomy club that belongs to the Astronomical League; The British Astronomical Association is an affiliated organisation - you can pick it on the sign-up form. /callump
  12. There are some nice animations on this facebook page https://www.facebook.com/HubblesVariableNebula These have been created by Dr. John Lightfoot of ROE who wrote this interesting paper in 1989 http://adsabs.harvard.edu/full/1989MNRAS.239..665L Dr. Lightfoot will be talking about Hubble's VN at the BAA deep sky section webinar on March 6 - will be open to all. Callum
  13. I have a few maintenance chores I need to do like collimation and redo polar alignment. Even a clear view of the north with the Moon up would be good I was wondering if the spike was caused by the dew shield, but did not follow it up at the time. Callum
  14. This globular cluster in Lynx seems to be fairly faint (mag 10), and is one of the most distant (about 269 kly from us). It was called the Intergalactic Wanderer, because at one time it was not thought to be orbiting our galaxy like other globular clusters do. But in fact it is. Again the sky was poor last night (2021 01 06) so will probably revisit this on a better night. Callum
  15. NGC 2261 - Hubble's variable nebula. Last image from my session last night. Sky was quite poor by this stage, so background is very noisy.
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