Damocloid asteroid

Damocloids are minor planets such as 5335 Damocles and 1996 PW that have Halley-family or long-period highly eccentric orbits typical of periodic comets such as Halley's Comet, but without showing a cometary coma or tail. David Jewitt defines a damocloid as an object with a Tisserand's parameter relative to Jupiter of 2 or less (T_J ≤ 2), while Akimasa Nakamura defines this group with the following orbital criterion:

However, this definition that does not focus on Jupiter excludes objects such as (127546) 2002 XU₉₃, 2003 WG₁₆₆, and 2004 DA₆₂.

Using the Tisserand's parameter with respect to Jupiter of 2 or less, there are currently 156 damocloid candidates. Of these objects, 106 have orbital observation arcs greater than 30 days providing reasonably decent orbits. Their average radius is eight kilometers assuming an albedo of 0.04. The albedos of four damocloids have been measured, and they are among the darkest objects known in the Solar System. Damocloids are reddish in color, but not as red as many Kuiper-belt objects or centaurs. Other damocloids include: 2013 BL76, 2012 DR30, 2008 KV42, (65407) 2002 RP120, and 20461 Dioretsa.

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