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Borisov's variable nebule


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About this observation
Mike Harlow
Time of observation
18/07/2020 - 01:00
Borisov's variable nebule (?)
Observing location
Ipswich, UK
12 inch F/3.6 astrograph
Starlight Xpress H16 CCD
Astrodon luminance filter
125 x 30 seconds
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My first look at Borisov's variable nebula since Nick Hewitt's recent announcement on this site.  Positive and negative versions of the same image are shown; each 10 x 10 arc minutes with north up.  The very small and faint nebula is at the centre of each frame.

The ATEL discovery announcement gives the following details:

In course of the search for comets at MARGO observatory [MPC Code L51] located in Nauchnij, Crimea, the new nebula was discovered by GB. Observations were made with the own-made 0.65-m f/1.5 Hamiltonian reflector + 3Kx3K CCD. The object at the following position: R.A. = 21 37 18, Decl. = +66 51 57 (equinox J2000.0) was found that is not present on the digitized Palomar observatory sky survey plates. The integral magnitude measured on the unfiltered image with 180-sec exposure starting on 2020-06-21 at 20:10:55 UT was ~17m (limiting magnitude 20.3). The object had a cometary appearance with a diameter about 20 arc sec plus a jet-like tail about 40 arc sec long in PA=315 deg.

Images of the new nebula can be found at

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