2005 UN524: The first Uranus trojan discovered?

[h2ouniverse]

<p>Despite its&nbsp;discovery in 2005 quite long ago,&nbsp;2005 UN524 has just been declared to the Minor Planet Center by its discoverer. Its orbit is nearly circular, intersecting the one of Uranus. It lies currently close to the L4 Sun-Uranus lagrangian point. Its absolute magnitude of 9 would give a diameter range of about [40-90km].</p><p>http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2005%20UN524;orb=1;cov=0;log=0#orb</p><p>That makes it a very good candidate to be the first Uranus trojan ever discovered.</p><p>A significant reservation comes though from the semi-major axis of 20.33AU, that corresponds to an instant pseudo-period of 91.7 years, that is 8.7% longer than the one of Uranus. However, the pseudo-periods of the Jupiter trojans are quite dispersed: the most deviant Jupiter trojan is 2006 DS70, that is acknowledged as being a trojan despite a pseudo-period that differs from more than 9.2% from the one of Jupiter.</p><p>Let's see, when they come with a&nbsp;more accurate determination&nbsp;of the orbital parameters and the drift from the osculating Keplerian&nbsp;orbit, whether there is an established 1:1 resonance...</p>