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By Xilman
At long last I have managed to image Caliban, also known as Uranus XVI. It is a small (circa 72km) outer satellite of Uranus which was discovered in September 1997 using the Hale 5m telescope at Palomar. Incidentally, Sycorax (U-XVII)was discovered in the same observing session. That satellite is around 1.7 magnitude brighter and so much easier to observe.
Although a three hours exposure, unfiltered for maximum sensitivity, was used the signal to noise ratio is barely 3 and serious image processing was needed to produce a relatively clear image. Even so, it is not especially obvious. The reason is that the MPOC ephemeris predicts that the satellite has a magnitude of 22.2 at the time of observation. More information is available at http://www.astropalma.com/Projects/Satellites/caliban.html
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By Willieghillie88
Hi all,
My friend and I were outside last night looking at the sky and looking for satellites. We saw a few of what I assume were satellites (flat unblinking steadily moving lights) One of them which crossed the sky East to West emitted 2 incredibly bright and intense, very large flashes of pure white light, spaced maybe 2 minutes apart from each other. Neither of us have any more than a basic school knowledge of astronomy but are both interested. We wondered if anyone on here could help shed any light on the flashing satellite we saw?
Many thanks for your time.
Iain
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By ShrewView
Hi all.
I was out most of last night under a lovely clear sky and did a spot of basic imaging of a few Messiers. On looking at the images today there were plenty of satellite trails as always, and Stellarium helps me identify them mostly, but I'm having trouble identifying one, so any help or useful sources I can try would be appreciated.
The area I was looking at was around M90 and in taking 20 or so one minute exposures I spotted a couple of trails. The first moving slowly took around 10 minutes to cross the width of the imaged area so appears on ten images and I can't find a match for this. The image below was taken at approx. 2.14am.
The second trail moves fairly swiftly taking about 1.5 minutes to travel the length of the frame, so moving much faster and appears to be Cosmos 2476, taken at 2.23am.
Any ideas welcome.
I've assumed its a satellite and not an asteroid or another one of those Teslas
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By physicus
It's difficult to get a sense of scale in this astronomy game; but we try. So here are 8 pics of the ISS passing between Vega and Epsilon Lyra last night - which is a second's worth of my Canon 7D firing off as fast as it can. The background is a single 30 second tracked exposure for a bit of context. Details: Esprit 100 prime focus/Canon 7D:1/1000s ISO1600 +30s background. The trick if you want to try this is to use planetarium software to find out exactly when the ISS will be near a bright object, then pre-align and focus on or near that object, then wait for the ISS to appear in the finder before letting the shutter go in rapid mode. I also optimised pre-focus on the computer using the focus feature on Nebulosity before switching the camera back to stand alone mode.
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