miércoles, 26 de diciembre de 2012
This comet is suffering a'' stop'' brightness, so it follows from the last update of my personal analysis of the light curve of this comet, this stop has occurred after perihelion, and a heliocentric distance of R = 1.2 ua , And T + 20, (20 days after perihelion), the last visual measurement of this comet, which is the 23rd of the situation in MT Hui, m1 = +9.1, the most optimistic estimates placed it at m1 = + 8.0, but given the current visual photometric model of comet, is unlikely to exceed the visual magnitude +9, several hypotheses, this change in behavior, perhaps now, the comet is exposing a less active hemisphere of its nucleus, and this follows in a lower gas-dust activity, there is also the possibility that a change in the prevailing volatile, which quelled the main gas activity would have driven down the rate of increase in brightness, although this is less likely, given its current heliocentric distance, and that this occurs in the heliocentric range 1.4
H20, its current brightness law, is r (-3.8), still below what is normal for r (-4.0), which confirms this drop in activity.
The actual photometric visual model is :
m1 = 9.4 + 5 log ( d ) + 9.4 log ( r )
Photometrics visuals parameters :
based in 31 visuals observations from Comet Obs , observadorescometas and Cometas-LIADA.
jueves, 6 de diciembre de 2012
HCN PRODUCTION RATE IN PANSTARRS COMET C/2011 L4 calculated the HCN's production rate of comet C/2011 L4 PANSTARRS based in 107 reduced's magnitudes from database : ICQ , Comet Obs , observadorescometas and Cometas LIADA , the preliminary results from the heliocentric distance range 2.5 < r < 5.5 show the HCN equation : log Q [ H2O ] = 25.35 + ( -0.0003 ) * R coefficient correlation R = -0.98 The outflow velocity in R = 5.189 is 1.85 km s-1 , based in v(HCN) = 1.59 * r ( -1/2 ) and R = 2.778 is 0.99 km s-1 The HCN production for PANSTARRS comet is based in work '' Observations of HCN in comet Halley ''by F.P.Schloerb et at 1987, published in Astronomy and Astrophysics 187 , in equation log Q [ HCN ] = 27.58 - 0.24 ( m1-5log(d))
sábado, 1 de diciembre de 2012
Preliminary Results ...., WATER PRODUCTION RATE IN PANSTARRS COMET The author of this analysis , calculated the water production rate of comet C/2011 L4 PANSTARRS based in 107 reduced's magnitudes from database : ICQ , Comet Obs , observadorescometas and Cometas LIADA , the preliminary results from the heliocentric distance range 2.5 < r < 5.5 show the water equation : log Q [ H2O ] = 28.39 + ( -0.0003 ) * R coefficient correlation R = -0.98 For comparison for halley's comet in visual aparition in 1986 show in R = 2.5 , log Q [ H2O ] = 28.8 mol s-1 or ~ 2000 kg/seg. , PANSTARRS COMET in 2012 from R = 2.5 , log Q [ H2O ]= 27.6 mol s-1 or ~ 100 kg/seg , the halley's comet have sublimation rate factor's 20 superior for the PANSTARR'S comet , the difference is : d ( log Q [ H2O ]) = -1.2 mol s-1. The water production for PANSTARRS comet is based in work '' The correlation between visual magnitudes and water production rates '' from authors L.Jorda , J.Crovisier and D.W Green , published in revist Asteroids , Comets and Meteors ( 2008 ) . Carbon Diatomic production rate is calculated based in power law's or photometrical parameter ( n ) activity index from next equation : log Q [ C2 ] = -4.6 * log R Morris and Hanner ( 1993 )
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