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## Orbit of Asteroid (99942) Apophis from Observations 2004—2013

Transactions of IAA RAS, Issue 31, 49–58 (2014)

Keywords: asteroid Apophis, orbit, weighting observations, optical observations, radar observations

### Abstract

This article describes a method of improving Apophis orbit from combination of radar and optical observations. Weights to radar observations are assigned in an ordinary way. It is considered that the weights of an observatory's optical observations are inversely proportional to the mean residuals of observations based on some reference orbit. Several variants of orbits were considered as alternatives: a reference orbit found from optical observations considered as equally precise; an orbit based on radar observations only; and an orbit found as a result of combining radar observations and optical observations made by five independent observatories. The weights for these measurements were assigned due to the mean residuals of observations taken from the Minor Planet Center data within the ten years period. Several solutions found under various assumptions were compared with those reported on the websites of JPL and NEODyS. Also, solutions with reduced weights of observations made the same night were obtained. These solutions demonstrate good representation both for optical and radar observations and in some respects exceed those published on the sites of JPL and NEODyS.

### Citation

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O. M. Kochetova, Yu. A. Chernetenko, V. A. Shor. Orbit of Asteroid (99942) Apophis from Observations 2004—2013 // Transactions of IAA RAS. — 2014. — Issue 31. — P. 49–58. @article{kochetova2014, abstract = {This article describes a method of improving Apophis orbit from combination of radar and optical observations. Weights to radar observations are assigned in an ordinary way. It is considered that the weights of an observatory's optical observations are inversely proportional to the mean residuals of observations based on some reference orbit. Several variants of orbits were considered as alternatives: a reference orbit found from optical observations considered as equally precise; an orbit based on radar observations only; and an orbit found as a result of combining radar observations and optical observations made by five independent observatories. The weights for these measurements were assigned due to the mean residuals of observations taken from the Minor Planet Center data within the ten years period. Several solutions found under various assumptions were compared with those reported on the websites of JPL and NEODyS. Also, solutions with reduced weights of observations made the same night were obtained. These solutions demonstrate good representation both for optical and radar observations and in some respects exceed those published on the sites of JPL and NEODyS.}, author = {O.~M. Kochetova and Yu.~A. Chernetenko and V.~A. Shor}, issue = {31}, journal = {Transactions of IAA RAS}, keyword = {asteroid Apophis, orbit, weighting observations, optical observations, radar observations}, pages = {49--58}, title = {Orbit of Asteroid (99942) Apophis from Observations 2004—2013}, url = {http://iaaras.ru/en/library/paper/1031/}, year = {2014} } TY - JOUR TI - Orbit of Asteroid (99942) Apophis from Observations 2004—2013 AU - Kochetova, O. M. AU - Chernetenko, Yu. A. AU - Shor, V. A. PY - 2014 T2 - Transactions of IAA RAS IS - 31 SP - 49 AB - This article describes a method of improving Apophis orbit from combination of radar and optical observations. Weights to radar observations are assigned in an ordinary way. It is considered that the weights of an observatory's optical observations are inversely proportional to the mean residuals of observations based on some reference orbit. Several variants of orbits were considered as alternatives: a reference orbit found from optical observations considered as equally precise; an orbit based on radar observations only; and an orbit found as a result of combining radar observations and optical observations made by five independent observatories. The weights for these measurements were assigned due to the mean residuals of observations taken from the Minor Planet Center data within the ten years period. Several solutions found under various assumptions were compared with those reported on the websites of JPL and NEODyS. Also, solutions with reduced weights of observations made the same night were obtained. These solutions demonstrate good representation both for optical and radar observations and in some respects exceed those published on the sites of JPL and NEODyS. UR - http://iaaras.ru/en/library/paper/1031/ ER -