Discovered by L. Boyer MPC designation 1339 Desagneauxa Minor planet category main-belt · Eos Orbits Sun Asteroid family Eos family Asteroid group Asteroid belt | Discovery date 4 December 1934 Alternative names 1934 XB · 1951 AF Discovered 4 December 1934 Discoverer Louis Boyer Discovery site Algiers Observatory | |
Named after discoverer's brother-in-law People also search for Sun, 1606 Jekhovsky, 1380 Volodia | ||
1339 Désagneauxa, provisional designation 1934 XB, is a stony Eoan asteroid from the outer region of the asteroid belt, approximately 24 kilometers in diameter. It was discovered on 4 December 1934, by French astronomer Louis Boyer at the North African Algiers Observatory in Algeria. A few nights later, the asteroid was independently discovered by astronomers Grigory Neujmin and Eugène Delporte, at the Crimean Simeiz and Belgian Uccle Observatory, respectively.
In the Tholen taxonomy, Désagneauxa is a stony S-type asteroid. It is a member of the Eos family, which is thought to have formed from a catastrophic collision, disrupting its parent body into more than 4,000 known asteroids. It orbits the Sun at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,916 days). Its orbit has an eccentricity of 0.06 and an inclination of 9° with respect to the ecliptic. As no precovery were taken, and no prior identifications were made, the body's observation arc begins with its official discovery at Algiers in 1934.
In August 2008, a rotational light-curve of this asteroid was obtained by French amateur astronomer René Roy. Light-curve analysis gave it a rotation period of 9.3209 hours with a change in brightness of 0.48 magnitude (U=2+). In November 2007, photometric observations at the U.S. Ricky Observatory (H46), Missouri, gave a refined period of 9.380 hours with an amplitude of 0.45 magnitude (U=3). In addition modeled light-curves, using photometric data from the Lowell photometric database and other sources, gave a period of 9.37510 and 9.37514 hours, as well as a spin axis of (n.a., 65.0°) and (63.0°, 53.0°) in ecliptic coordinates, respectively (U=n.a.).
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Désagneauxa measures between 22.96 and 25.73 kilometers in diameter, and its surface has an albedo between 0.127 and 0.159. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1747 and a diameter of 23.04 kilometers using an absolute magnitude of 10.7.
This minor planet was named by the discoverer in honour of his brother-in-law. Naming citation was first mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 122).