Visibility II / V
2019 NC1 (2019 NC1) The Aten / NEO asteroid was discovered in early July 2019, the finder is not clear? There have been observations of the asteroid from several observatories since 2014. The most likely finder is C57 TESS, they have a lot of observations from June 26, 2019 to July 1, 2019, which will be followed by dozens of observations from others within a couple of days (discovery confirmation observations?)? source MPC
https://minorplanetcenter.net/db_search/show_object?object_id=2019 NC1 . TESS Observatory is “The Transiting Exoplanet Survey Satellite
(TESS) "NASA's space telescope for the search for exoplanets. TESS is in a 2: 1 resonance with the Moon's orbit, TESS orbits the Earth twice as the Moon once. Source Wikipedia https://en.wikipedia.org/wiki/Transiting_Exoplanet_Survey_Satellite . Total estimate 250m, and rotation speed 8,96901h / r (measurement uncertainty about 30% :)) When photographing, the asteroid was at a distance of 0.0696au and the nearest 0.0620au at 17 August 2021. At the start, the asteroid was close to close and measurements were only possible from box 4, fast motion helped.
1Picture. first image in the series4 L60s measured, 2021-08-06UT 22: 23: 39UT 2459433.43309JDUT 21h31m18.84s -06d44'32.4 "17.0835mag Std Dev 91.177 SNR16.462 FWHM7.177", JPL Horizon 22: 23: 39UT 21h31m18.97s - 06d44'34.8 "16.47mag.
2Picture. last image in series 11 L60s measured, 2021-08-06UT 22: 37: 15UT 2459433.44253JDUT 21h31m16.87s -06d44'08.1 "16.857mag Std Dev 87.093 SNR14.780 FWHM6.591", JPL Horizon 22: 37: 15UT 21h31m17.00s - 06d44'10.1 "16.47mag.
3Picture sum view of L60s 1-11 stack of images, motion is displayed. Asteroid 13849 Dunn 17,612 mag, motion shown. No other asteroids under 18.8 mag are shown. TYC 5220-508-1 v.12.21mag stars used to calibrate the brightness measurement.