I have observed the comet a few days ago remotely under pristine skies of Namibia
using a 20cm telescope, with CMOS camera and green filter. I measured the total
brightness within a large aperture of 10'
  2021-03-15.15 UT, m1=9.9, coma dia. 10'

Thomas

> Am Wed, 17 Mar 2021 23:11:44 +0000
> schrieb Nick James <ndj@nickdjames.com>:
>
> Peter,
>
> Thanks for the image obtained under difficult circumstances.
>
> Martin Mobberley got 10.7 on March 9.78 and visual estimates on COBS are
> all around 10.0 now with one bright outlier. It probably won't get much
> brighter through March and April. At least it will become easier for us
> to observe from the UK over the next few weeks.
>
> Nick.
>
>
> On 17/03/2021 17:46, Peter Carson wrote:
> > Hi All,
> >
> > I managed to grab a rather blurry image of C/2020R4 ATLAS from my remote
> > observatory at Fregenal de la Sierra, Spain this morning. It was only 14 degrees
> > altitude, just above the observatory walls and minutes before the start of
> > astronomical twilight.
> >
> > Comphot gives it a visual equivalent mag of 10.07 in a 141 arcsec rad aperture.
> > It’s also showing a short vague dust tail. See my image here
> > http://www.astromania.co.uk/2020R4_20210317_0456_PCarson.jpg
> >
> > It’s blossomed since one of my earlier images in October last year when it was
> > only mag 18. See http://www .astromania.co.uk/2020R4_20201014_2137_PCarson.jpg
> > <http://www.astromania.co.uk/2020R4_20201014_2137_PCarson.jpg>
> >
> >   From southern England it’s currently rising about 03.15UT and at an altitude of
> > around 7 degrees by the start of astronomical twilight and improving in altitude
> > rapidly.
> >
> > Peter
> >
> > Peter Carson Z10
> >
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> >
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