We report photometric observations with Las Cumbres Observatory 1-m Sutherland-LCOGT C telescope. The observations from 2021 June 22.174 (UTC) indicate that the newly discovered 2014 UN271 has cometary activity at heliocentric distance of 20.18 au. The observations were done with a PanSTARRS w-band filter (equivalent to SDSS g'+r'+i') and were calibrated against Gaia G-band field stars. The photometry measured within a 1.56 arcsec (equivalent to 22,800 km) radius aperture corresponds to an average magnitude G=19.80 mag (with standard deviation of 0.12 mag) from the four frames. The object is brighter than the predicted nucleus magnitude V=21.15 based on an absolute magnitude H = 7.80 and phase function parameter G = 0.15 in V-band. The composite image derived from the four exposures reveals a coma that is slightly asymmetric toward position angle ~40 deg E of N. Based on analysis of the individual frames, the coma has a FWHM of 3.8'' compared to the mean FWHM of 2.1'' for the background stars. The astrometry extracted from these observations has been reported to the MPC.
This work makes use of observations from the Las Cumbres Observatory global telescope network.
