Forum Replies Created
-
Posts
-
I saw a weather report yesterday. Unfortunately I failed to save the URL. It would be nice to have a more authoritative source than that given below but …
https://www.express.co.uk/news/science/1427137/space-weather-forecast-solar-storm-aurora-evg
Does this help? Being an Oxford man I went to the Bod, which led me to this:
An interlibrary loan may be possible. Worth asking, anyway.
Hmm, I wonder if it is akin to SN1987A? I doubt that the LMC would be readily visible at that distance.
Detection of Rotational Variability in Floofy Objects at Optical Wavelength https://arxiv.org/abs/2103.16636The first Dobsonian I had showed serious spherical aberration.
Worked just fine as a light bucket, which I what I wanted it for.
Yes!
Please try it if you can; you only have a few more days of it being bright enough.
Really regretting not being in La Palma right now.
Further: note that the proposed rotation period of only 25 seconds implies that exposures of only a few seconds will be needed to get a good light curve. In practice, this suggests only 0.7m-class or larger telescopes will be able to do this successfully, likely implying the use of robotic telescopes.
Getting colour indices, on the other hand, should be somewhat easier as exposures >25s will average out the rotational behaviour. This could be a productive use of personal telescopes fitted with two or more standard photometric filters.
My thanks to Richard Miles and Tomasz Kwiatkowski for the further information.
And vice versa, in my experience. Over-long USB cables can give connection problems which are sometimes solved by using a powered hub.
Try it both ways, in other words.
I have absolutely no idea whether this might be an explanation, but I believe that aurorae produce radio waves which can be picked up by radio receivers.
There have been documented cases of unexpected diodes (akin to the good old cat’s whisker) producing audio outputs from AM radio transmissions. A few cases involved mercury amalgam dental fillings, for example.
I wonder whether this may be relevant.
You could always just suck it and see. It shouldn’t take more than one night to take dozens of exposures of a relatively bright star at a variety of settings. Then process them and see what works best for your equipment.
You make a good point, but up here in the sub-arctic the night time is very often at or below fridge temperature (~5C). When it doesn’t it often never gets dark at night anyway.
At the opposite extreme, a good calima in La Palma can result in the air temperature being higher than 20C all night and even a good two-stage Peltier cooler can’t get a camera much below -15C. Been there, done that.
I have an Odroid running Ubuntu and Kstars/EKOS as a proposed replacement TCS. I have been quite unable to find a driver for the dome controller (a Vellman board) and there are still teething problems with the mount (a FS2 controller). All the SX kit works perfectly; not yet tried the focuser. It will be months before I can return to La Palma and try to resolve these issues. 8-(
A Celestron NEXIMAGE 5 purchased via the BAA forum also fails to work under the local Ubuntu installation but I have found a package which claims to contain a driver for the camera.
Other people with more main-stream equipment have no significant problems with Linux-based controllers.
I whole-heartedly agree!
As already stated, I also generally run in 2×2 binning mode for photometry.
My Lodestar 2 works very nicely. Whether it has an abnormally large (or small, for that matter) I couldn’t say.
I think what we are really saying is that you have to pay attention!
Astrometry could well be different from photometry which could well be different from spectroscopy which could well be different from bare detection which could well be …
To summarize: think about what you wish to achieve and make your decisions in that light.
Robin, thank you very much for posting the link to http://spiff.rit.edu/richmond/signal.shtml which I had not seen before and have now bookmarked.
Typing in the values for my set-up confirmed my prejudice that the read noise is almost entire unimportant for the photometric work I do, where I generally take 30s to 60s subs and co-add.
