lunes, 23 de septiembre de 2019
I find a new correlation of diameter and magnitude absolute , there are several applicable equations to calculate based on the absolute luminosity of a comet, its diameter or its nuclear radius : Delsemme 1987 r nuc = 10^( 1.59-0.199H ) applied this formula ,my calculations indicated r nuc ( C/2048W2 ) = 0.99 kms For Sosa and Fdez ( 2011 ) log D ( kms ) = 1.2-0.13H for this formula D ( kms ) = 0.79 kms assuming p=0.4 g cm3 it is necessary to compile absolute total magnitudes absolutes for all's comets .
miércoles, 4 de septiembre de 2019
Update of the ccd light curve of comet C / 2018 W2 AFRICAN based on 488 observations of this comet, where I have made the following approximate calculations: 1 Photometric parameters of the comet, calculation of the estimated magnitude estimated at m0 = + 12.5 and the rate of increase in brightness or activity index, n = 4.9, the result indicates an index that shows little or no activity at the core level, behaving as a solid object with almost no gaseous activity. 2 Based on the formula of Sosa and Fdez 2011,: log D (km) = 1.5-0.13H The estimated diameter is 0.9 kms, which is consistent with the data offered for other comets in the same study. 3 Water production rate, based on the estimated absolute magnitude, Q (H2O) ~ 27.6 mol / s, a fairly low figure that matches the tables shown in the same study. 4 Fraction of active area, here we can only establish a scale that turns out to be between 0.5
New update of the visual light curve of comet NEOWISE, based on 798 observations of the comet, from the COBS database, my analysis includes ...
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