Observation by Grant Privett: Borisov's Nebula

Uploaded by

Grant Privett

Observer

Grant Privett

Observed

2023 May 29 - 00:00

Uploaded

2023 May 29 - 23:11

Objects

Borisov's variable nebula

Equipment

300mm f/4 Newtonian
NEQ6+Rowan belt upgrade
Starlight Xpress Trius 694 mono

Exposure

19x 360s

Location

Near Salisbury

Target name

Borisov's nebula

Title

Borisov's Nebula

About this image

This dim nebula was lower in the sky than I would have liked, plus a first quarter Moon was shining and the big problem was that it doesn't really get dark this time of year.

But I had finally got my OAG going again and so was tempted to try going deep on this. Alas, I had not bargained on what a pain satellites are this time of year. I took 24 images but 5 had satellites on them that went near the nebula - and sigma clipping did not sort them out due to the changing sky brightness.

The result is not as good as Richard's recent effort but I'm still optimising the focus (the filter wheel and CCD are a weighty pairing and I'm sure the focuser doesn't like it).

So, am looking forward to 600 or 900s exposures in the autumn on moonless nights. Yes, the background count can be big and a good flatfield is essential but a trial of 600s images of M101 got me to mag 20.8 so I hope to crack mag 21 without half filling the SSD with 30s exposures.

Files associated with this observation

boris20230529.jpg (956.4 kB)

Like this image

Callum Potter, Mike Foylan, Richard Sargent

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