Discovered by M. F. Wolf MPC designation 884 Priamus Discovered 22 September 1917 Spectral type D-type asteroid | Discovery date 22 September 1917 Orbital period 12 years Orbits Sun Discoverer Max Wolf | |
Pronunciation ˈpraɪəməs (prye'-ə-məs) Named after Priamus
(Greek mythology) Alternative names 1917 CQ · 1929 XX
1938 KE Discovery site Landessternwarte Heidelberg-Königstuhl Similar 911 Agamemnon, 588 Achilles, 617 Patroclus, 528 Rezia, 540 Rosamunde | ||
884 Priamus (prye'-Ə-məs), provisional designation 1917 CQ, is a rare-type Jupiter trojan from the Trojan camp, approximately 100 kilometers in diameter. It was discovered on 22 September 1917, by German astronomer Max Wolf at Heidelberg Observatory, southern Germany.
In the Tholen taxonomy, the dark and reddish body has a rare D-type. As of 2016, a total of 46 minor planets are known to possess this spectral type. It is orbiting in the trailering Trojan camp, at Jupiter's L5 Lagrangian point, 60° behind the Gas Giant's orbit (also see Trojans in astronomy). The asteroid orbits the Sun at a distance of 4.6–5.8 AU once every 11 years and 10 months (4,309 days). Its orbit has an eccentricity of 0.12 and an inclination of 9° with respect to the ecliptic. The asteroid's observation arc begins 2 months after its official discovery date, as the first recorded observation was made at Heidelberg in November 1917.
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, the asteroid measures 101.1 and 120.0 kilometers in diameter and its surface has an albedo of 0.037 of 0.044, respectively. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 96.3 kilometers, based on an absolute magnitude of 8.81.
Several rotational light-curves have been obtained for this asteroid from photometric observations. They gave a rotation period between 6.85 and 6.90 hours with a brightness variation between 0.23 and 0.40 in magnitude. The first two light-curve were obtained by Stefano Mottola in January 1993 and October 2001, in collaboration with Claes-Ingvar Lagerkvist and Marco Delbo at Kvistaberg and Pino Torinese observatories, respectively (U=3/2+). Two well-defined light-curves were also obtained by Robert D. Stephens and Linda M. French at the Center for Solar System Studies and Illinois Wesleyan University in July 2010 and January 2015 (U=3/3). In addition, observations by Ukrainian astronomers in August 2010, were also used to build a well defined light-curve (U=3).
The minor planet was named for Priamus (or Priam), the king of Troy during the Trojan War. The Jupiter trojans 624 Hektor and 3317 Paris are named after his sons Paris and Hector (H 86).