1339 Désagneauxa
| Discovery | |
|---|---|
| Discovered by | L. Boyer |
| Discovery site | Algiers Obs. |
| Discovery date | 4 December 1934 |
| Designations | |
| MPC designation | 1339 Desagneauxa |
|
Named after
|
discoverer's brother-in-law |
| 1934 XB · 1951 AF | |
| main-belt · Eos | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.53 yr (29,780 days) |
| Aphelion | 3.1933 AU |
| Perihelion | 2.8457 AU |
| 3.0195 AU | |
| Eccentricity | 0.0576 |
| 5.25 yr (1,916 days) | |
| 222.76° | |
| 0° 11m 16.08s / day | |
| Inclination | 8.6913° |
| 291.00° | |
| 162.37° | |
| Physical characteristics | |
| Dimensions |
22.96±1.7 km 23.04 km (derived) 24.20±0.65 km 24.450±0.209 km 25.733±0.200 km |
|
9.3209±0.0006 h 9.37510±0.00005 h 9.37514±0.00001 h 9.380±0.003 h |
|
|
0.1274±0.0165 0.144±0.024 0.151±0.009 0.1589±0.026 0.1747 (derived) |
|
|
B–V = 0.790 U–B = 0.425 Tholen = S · S |
|
| 10.30±0.23 · 10.7 · 10.81 | |
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.).
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