viernes, 10 de julio de 2020
Light Visual Curve C/2020 F3 NEOWISE
I just updated the visual light curve of Comet C / 2020 F3 NEOWISE, it has been a surprise for all amateur and professional astronomers, the ephemerides indicated a maximum visual magnitude close to +8, but currently it shines with magnitude +1.5, we are talking about An important start of activity at the nuclear level that has increased + 6.5 visual magnitudes, my preliminary calculations indicate an absolute magnitude of m0 = + 7.3, this is compatible according to my analysis with a core diameter of ~ 2.5 kms approximately, and a radius nuclear of Rn ~ 1.2 kms. , the formula that dominates the comet's brightness law is: m1 = + 7.3 log (D) + 11.6 log (r) So the activity index n = 4.6, with a heliocentric-photometric law of R ^ -4.6, compatible with the equations of log Q (C2) = - n * log (r) given by Morris and Hanner 1986, like than with water. The light curve is based on 173 visual observations, from COBS plus the own sources that send me observations, from here to thank W. Souza and S.Yoshida for their personal contributions to my analyzes. The approximate calculation of the production rate of water Q (H2O) for this comet indicates about 10 tons per second, based on the reduced light curve data.
Based in next telegram : ATEL #13945 ATEL #13945 Title: Rotation of Comet C/2020 F...
C/2019 Y4 ATLAS by HUBBLE SPACE TELESCOPE Original observing program: 16111 - Jewitt, David - University of California - Los Angeles Breakup...
Discovery Date December 28, 2019 Magnitude 19.6 mag Discoverer Asteroid Terrestrial-Impact Last Alert System (ATLAS) search program