Posts Tagged ‘Jovian Trojans’

The first Jovian trojan has been discovered at the ISON-NM observatory

Calvin College

August 23, at our observatory, the first Jovian trojan was discovered, receiving the designation 2011 QJ9. After the appearance of this object on the NEO Confirmation Page, and after refinement of its orbit on Aug 24, it became possible to link these observations to observations obtained on Aug 28 by the American survey Pan-STARRS. After that, the observation arc immediately rose to nearly a month.

Earlier we were able to recover two Greeks and now we have discovered a new rarer object. The total number of Greeks (3176) is twice that of the Trojans (1700). 2011 QJ9 is a rather large object, with a diameter on the order of 5.5 km, although for this family of asteroids, it is a very small object. The largest Trojan is over 100 km in diameter.

Recovery of a Jovian Trojan 2010 OY75

A new interesting object was discovered during the survey of October 15th. From our measurements of the first night, it was proposed that the object might be gravitationally bound to the largest planet in the solar system – Jupiter. The decision was made to continue observing the object iJTA033. Measurements obtained the second night, supported the hypothesis that the new object was located beyond the main asteroid belt. The observations of the 17th of October removed all doubt – the object was gravitationally bound to Jupiter. Since a temporary designation had not yet been obtained, I sent a letter to the director of the MPC, Timothy Spar. Within a few hours our observations were tied to an object discovered by the space telescope WISE on June 26, 2010. After two nights of observations the designation 2010 OY75 was given to an asteroid recovered by the observatory ISON-NM after 2.5 months.

The precision of the orbit of 2010 OY75 was significantly improved – it actually did belong to a rather rare family of asteroids – Jovian Trojans, located at the L4 point. At the moment 4525 asteroids of the family are known, 2792 of them are at the L4 point (“Greeks”), and the remaining 1733 – are at the L5 point (“Trojans”).

May 2017
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