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Think I have found the cause of my problem.
Three seeing profiles attached for T CrB with S30.
Stack from February 2025.
Stack from April 2026.
Single sub from April 2026.Looks to me like ZWO have screwed up their stacking algorithm, the April
2026 stack has saturated, 16 bits so maximum ADU is 65,535.Note the peak ADU for the stack from Feb 2025 is similar to a single
sub from April 2026.So the good news is that my data might be recoverable, the bad news is
that I am going to spend a lot of time stacking subs in an external
program.Stop press, in La Palma, ran S30 on T CrB overnight, 2,134 10 sec subs,
again stack is saturated, individual subs look OK.The effect is even more obvious on my S30 data.
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I think that is Venus. Rotated image so north is at top and tried matching objects. Alas Mercury seems to be behind our planet.
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Incredible image by Reid Wiseman of moonlit Earth after TLI burn. South at top (of course). Aurora and Zodiacal light visible. Is that Venus bottom right?
Help required. When I use Horizons to generate RA and Dec for the 23.43 UT TLI burn RA and Dec are 49 degrees below horizon with it rising 10 hours later. I am obviously doing something stupid. I just don’t know what!
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I echo Pauline’s comments about Allan’s amazing talks at the Newbury Astronomical Society’s Christmas Dinners. I often drove him and Rachel back to their home in Oxford afterwards. A second lecture on the A34 was a second highlight for me. RIP Allan.
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Are occasional mobile smart telescope users allowed to participate? 152 nights (41.6%), best month May (24), worst February (4).
Owen, journal is now on the website. Paper copies including the 2026 handbook are on the way. PDF of handbook can now be downloaded from website.
…and there is more….
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Here’s the piece in The Times.
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I think I may have captured fragments A & C with my humble Seestar. Here’s a comparison with Nick’s image taken about 35 hours earlier. Image scale is the same. The orientation of the tail is consistent with its motion. Thoughts or an artifact?
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According to my university notes angular seperation of red & blue images from atmospheric chromatic abberation is:
¬4 x 10^-6 x tan angle from zenith. Angles are in radians.
Based on a 450nm refractive index of 1.0002796 and a 650nm refractive index of 1.0002758.
Think it was Space X’s Transporter-14, Mel Gigg captured a nice video of it. Alas I was in bed. https://www.youtube.com/watch?v=RDe-gmF1dxM
Interesting!
Looks like a 4% chance of a visit to Australia on Dec 22nd 2032. The view of the Earth from the Moon at possible impact time.
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Very interesting to read Paul’s report in the latest Journal. It reminded me of the cover of a Patrick Moore SF book that I took out of the library when I was an excitable 10 year old. The illustration is by David Hardy.
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Up at 2.30am, clear, drove 4 miles to get a low NE horizon, my Seestar’s view at 3.30am. A little frustrating!
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Good news. C/2025 F2 (SWAN) is now in Seestar catalog. No Seestar star hopping for me tomorrow morning.
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