martes, 21 de agosto de 2018
I analyzed a total of 2725 visual observations of comet 21P / Giacobinni-Zinner, from 1959 to 2018, with a total of 10 steps perihelion, analyzing their photometry the general equation shows the following result, my personal equation is as follows: m1 = +11.5 + 5 log (d) + 11.2 log (R) Photometricals Parameters General of 10 Perihelion Magnitude Absolute m0 = 11.5 Activity Index n = 11.2 (4,5) ICQ Formula m1 = 9.0 + 5 log (d) +15.0 log (R) This is the largest historical series obtained from this comet based on the data offered by MPC / IAU and COBS database International. The residual data obtained by J.P. Navarro Pina, offer greater statistical confidence: +/- 1.70 + 0.000 ---- 2725 Visuals Observations (Navarro Pina 2018) +/- 2.54 +1.82 ------ 2725 ICQ / IAU Navarro Pina has also updated the following physical quantities of the comet 21P / GZ data 2018, Diameter of the core log D (kms) = 0.42 ( 2,0 kms ) , Estimated mass log M (kg) = 11.9, Water rate production max log Q (H2O) ~ 28.5 mol / s-1, in the perihelion . The last updated indicated active are of FA ~ 80 km2 ( based in Ye et al. 2018 ) The photometric-visual parameters obtained for 2018 are m0 = 8.6, n = 8.3, the latter indicates a high rate of volatile chemical components of the nucleus.
jueves, 28 de septiembre de 2017
Analysis of the light curve of comet C / 2017 O1 ASASSN based on 518 visual observations and ccd of Comet Obs yahoogroups.com, observers comets yahoogroups.com, COBS database, LIADA comet database, it is the largest curve of elaborated light of this comet so far, based on this analysis the comet suffered an outburts in R = 1.85 au which carried it at a confirmed rate of 400-500 cms of dust production based on data from CARA database Afp parameter, this outburts, made up 2 magnitudes ccd to the comet with respect to its average magnitude, in the data of visual magnitude I have not found any indication of this outbreak, the ccd data are of value to know the rate of dust production. In T-60 days, the comet suffered an inburts or brake in its rate of increase of brightness that makes it lower 1.5 magnitudes ccd, in the visual data I have not found any indication of this fact either. The brightness brightening curve of the comet is very slight and the comet is most likely not to exceed a maximum visual magnitude of m1 = + 8.5, but there are more bursts of brightness. The calculated physical parameters of this study are based on the formulas given by Sosa & Fdez 2011. Green line : visual Observations , Red line : ccd observations . Periodogran Analysis of 518 observations a search of periodicity of nucleus of comet ( Precession Period )
miércoles, 12 de abril de 2017
The light curve is dominated by 4 different brightness law settings separated by the red lines, at number 4, the outburts of the comet are observed, estimated in 2 magnitudes, I have made an adjustment of polynomials of degree 1, to adapt The light curve to the 4 different settings.
sábado, 8 de abril de 2017
My last analysis of the ccd-visual light curve, reduced magnitude vs log R, shows 2 semicurvatures in the law of brightness of the comet (in R = 5 au and R = 2 au), DJ 550 and DJ 800, something totally new Which he had not seen in a light curve of a comet, with an upper envelope and a lower envelope in the ccd data, coinciding with a modulation in the law of brightness of the comet. My analysis shows a total of 603 ccd and visual observations, the largest light curve of this comet performed, note that the visual observations show greater dispersion and higher brightness, the magnitudes ccd shows greater clustering in the data. Attached link of my last analysis
domingo, 8 de enero de 2017
The amateur astronomer and visual observer of comets, J.P.Navarro Pina, has discovered a burst of brightness or outburts in a comet near Earth, the comet in particular is called 45P / HONDA-MRKOS-PAJDUSAKOVA, it is a periodical comet, Whose orbit around the sun is every 5 years, currently this comet should be in visual magnitude +7, but on the night of January 5, 2017, the astronomer Murcia, J.P.Navarro Pina, measured the visual magnitude of the comet in 6, is To say 1 magnitude visual more brilliant than it was in previous nights, the discovery of the outburts by Navarro Pina, has put in alert to the international astronomical community, since now the comet could be visible to the naked eye since Any dark place and to be as bright as the comet Halley in 1986, various observers of world comets have confirmed the explosion of brilliance of the Spanish astronomer, comets, are fragile stars, that are composed mostly by water, dust, and rock, From time to time, some of them break or suffer gas and dust eruptions, causing sudden increases in brightness, which make them more spectacular in the night sky. J.P.Navarro Pina, a veteran astronomer from Murcia, and an observer of comet visuals, with more than 30 years of astronomical observations behind him, specialized in Comets, he has participated and collaborated with different astronomical centers and world observatories with his Measures of comets.Adjunt light visual curve of COBS database .
domingo, 25 de diciembre de 2016
My analysis of the visual light curve of Comet C / 2016 U1 NEOWISE indicates that the comet based on its abosolute magnitude of m0 = 11.0 would have an estimated core diameter of D = 1.15 kms (Navarro 2016) based on the formula Of Sosa & Fdez, 2011, and a core radius of Rn = 0.575 km, and an estimated mass of M = 0.3x10 ^ 12 kg (Navarro 2016), my initial conclusions show that this is a small fragment of new comet Of the Oort cloud with very volatile "ice volatiles", the images show a very gaseous and little dusty comet, where the sublimation of gas is greater than the dust, probably a fragment of giant comet detached.