Visibility I / V
The comet C / 2010 U3 (Boattini) was filmed on the second night of the April 2021 campaign. The comet was first discovered by an Italian
astronomer Andrea Boattini from images taken with the Mount Lemmo 1.5 m telescope on 31 October 2010 at 19mag brightness, and
at a heliocentric distance r H = 18.4 au. Source of extensive research The Astronomical journal
https://iopscience.iop.org/article/10.3847/1538-3881/ab0e09 . We have already photographed this comet from 2016-12-9 from a distance of 8.9096au and 2017-04 -14 as the comet approaches its perihelion. The comet visited the solar system 1.96 Million years ago, with a family distance of 8,364 au. Thus, the C / 2010 U3 (Boattini) is quite certainly an old comet from the Oort cloud, the source of the previous study. When shooting, the comet was 8.8632au and was closest to 7929au on January 27, 2019. The particularly good weather when shooting helped select this object and it worked :). Maybe a new record attempt in the fall?
1Picture. First image 1-2 stack of images measured, 2021-04-10T 21: 15: 57UT 2459315.38607JDUT 13h41m55.73s + 37d52'15.6 "T19.176mag Std Dev 41.475 SNR7.654 FWHM10.732", JPL Horizon 21: 15: 57UT 13h41m55.67s + 37d52'12.2 "T18.255mag.
2Picture. Last image 10-11 stack of images measured, 2021-04-10T 21: 46: 51UT 2459315.40753JDUT 13h41m55.12s + 37d52'14.3 "T18.540mag Std Dev 41.983 SNR10.420 FWHM13.30", JPL Horizon 21: 46: 51UT 13h41m55.09s + 37d52'11.5 "T18.255mag.
3Picture. summary image according to the stars, the movement is shown. Asteroid (495737) 2016 EM 19.7mag, motion shown. No other detectable asteroids below
24.0mag. TYC 3026-1199-1 v.11.66 stars used to calibrate the brightness measurement.