miércoles, 6 de enero de 2016
My last and personal analysis of the light visual curve ccd+visual , show the data of recent outburts confirmed for multiples observers , the first notice of alert is one message of Stephen McCann UK in the yahoogroups.com comets-ml the 3.87/Jan./2016, the observer alert increment brightness of m1=+8.5 , the last visuals magnitudes from the data indicate range of visual's magnitudes of 9.5 < m1 < 10.5 , the visuals magnitudes : 8.0 , 8.8 , 8.5 and the last recent 7.9 ( Neil Norman , UK ) in the 3 , 4 and 5 January 2016 . The photometric law visual indicate visual magnitude max. of m1~ +5.0 in 20/06/2016 , based in formula m1 = +2.2 + 5 log (d) + 18.2 log (r) , the power law is high n=7.3 , based in R^ (-7.3) .
viernes, 1 de enero de 2016
The motion of dust particles in a cometary environment is a complex process, and a precise description of the trajectories of grains within the coma requires adavnced hydrodynamic models, taking into account the interaction between gas and dust released from the surface. In the tail, dust and gas are decoupled and the only significant forces affecting the grain trajectories are the solar gravity and radiation pressure. Both forces depend on the square of the heliocentric distance but work in opposite directions. Their sum can be seen as a reduced solar gravity, and the equation of motion is simply m*a=(1-beta)*solar_gravity, where beta is the ratio radiation_pressure/solar_gravity, and is inversely proportional to the size of the grains for particles larger than 1 micron. From this relation, Finson & Probstein (1968) proposed a model which describes the full tail geometry with a grid of synchrones and syndynes; lines representing respectively the locations of particles released at a same time, or with the same beta. This model is simple because it considers only particles released in the orbital plane of the comet, and with zero initial velocity, but it provides a very good approximation of the shape of the tail, and has been used successfully to study many comets. One of the many strengths of this model is the possibility to date events in the tail. For instance, one can understand if regions of higher density are related to outbursts of the nucleus, or are a result of fragmentation of large chunks of material within the trail. It can also be used to disentangle between continuous activity, short outbursts, or impacts, when all these events produce a feature which at first look like a normal cometary tail.
viernes, 23 de octubre de 2015
Hi all , based in the analysis of the light visual and ccd curve of comet C/2013 US10 CATALINA and recopilation from database MPC /IAU and list of comet obs and observadorescometas yahoogroups.com of 1.210 observations , i analyzed the graphic and data and obtained than the probability of visual maximum magnitude for this comet is m1(max)~ 6.0 for 2016 , my differential analysis of the light curve based on a sum of observations CCDs and other visual and visual only gives the result for only next formula : m1=5.4+5log(d)+7.8log(r) and the poor activity index n=3.1 this result indicate than brightness of comet is a comet that behaves solid object type asteroid in actually heliocentric distance R=1.00 au , this is very typical of the new comets Oort Cloud (e= 1.000322) when they exceed the heliocentric distance of r = 1.5 au brightness stagnation and stifling dust activity and especially the gas is produced, in my opinion this activity remains off and could be reactivated in February 2016. ** Updated ( 25/10/2015 ) 1 .-The new calculations of J.P.Navarro based in the reference of A.Sosa and J.A. Fdez. from ''Masses of long period comets'' ( 2011 ) , show new physical parameters of comet C/2013 US10 CATALINA : The Log10 ( water production rate ) maximum based in correlation between visual total heliocentric magnitudes for US10 CATALINA show 10^29,5 MOLEC/S ( ~ 3.000 kg / sec )in R = 1.0 au . 2.-The Fraction active surface area calculated by Navarro Pina is FASA=2.4 , for comparison the comet C/2004 Q2 is FASA=2.4 , C/2007 W1 FASA=2.3 , this indicate high rate of fraction surface area for US10 CATALINA , by example the 1P/Halley FASA=0.2 . 3.-The Mass estimated is Log10 M (kg) =13.00 based in absolute magnitude for total visuals observations m0=5.4 , 10^12 kg . 4.-The Diameter calculated is log10(D)=0.6 kms. , based in the formula log10 D (km)=1.5-0.13*m0 ( Sosa & Fdez 2011 )
domingo, 13 de septiembre de 2015
lunes, 22 de junio de 2015
viernes, 29 de mayo de 2015
I just process the image of the surface of the nucleus of Comet 67P / Churyumov-Gerasimenko, ESA has placed at last an open kernel image file, I used to make one of them, very curious, because it shows an image of a plume important ice is highly reflective, the projected shadow can give an idea of how high is, likewise in the area of volatile ice deposits on the surface are, I hope you like it.
domingo, 17 de mayo de 2015
Analysis of the reduced light curve of comet C/2014 Q2 LOVEJOY , Water rate production , Fraction active surface , Masses estimated .
I estimate the masse for a comet C/2014 Q2 LOVEJOY , the diameter of the nucleus , maximun water rate production in the perihelion , and active surface fraction , this calculations is based in 3.200 observations from database MPC/IAU , and personal elaborating light visual and ccd curve of comet along time of near 1 year of work , the down graphic is reduced for geocentric distance in y axis , and x axis the heliocentric distance in au , this work is new analysis for comet C/2014 Q2 LOVEJOY and contain great quantity of observations . The introduction physical's parameters of Mn ( masse) , log Q(H2O) , f , and D , the results , is Max log Q(H2O) = 10e 28.58 mol s-1 ( 1000 kg/sec. ) , log 10 Mn ( kg) = 11.6 , D = 1.0 km , f = 2.3 . Link of download in pdf : https://www.facebook.com/download/371419113055823/~WRD0004%20Copy.pdf