_D%25C3%25A9sagneauxa.png) Modelled shape ofDésagneauxa | |
| Discovery[1] | |
|---|---|
| Discovered by | L. Boyer |
| Discovery site | Algiers Obs. |
| Discovery date | 4 December 1934 |
| Designations | |
| (1339) Désagneauxa | |
Named after | discoverer's brother-in-law[2] |
| 1934 XB · 1951 AF | |
| main-belt · Eos[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 82.57 yr (30,160 days) |
| Aphelion | 3.1936AU |
| Perihelion | 2.8467 AU |
| 3.0202 AU | |
| Eccentricity | 0.0574 |
| 5.25yr (1,917 days) | |
| 260.48° | |
| 0° 11m 16.08s / day | |
| Inclination | 8.6903° |
| 291.00° | |
| 162.21° | |
| Physical characteristics | |
| Dimensions | 22.96±1.7 km[4] 23.04 km(derived)[3] 24.20±0.65 km[5] 24.450±0.209 km[6] 25.733±0.200 km[7] |
| 9.3209±0.0006 h[8] 9.37510±0.00005 h[9] 9.37514±0.00001 h[10] 9.380±0.003h[11] | |
| 0.1274±0.0165[7] 0.144±0.024[6] 0.151±0.009[5] 0.1589±0.026[4] 0.1747(derived)[3] | |
| Tholen =S[1] · S[3] B–V = 0.790[1] U–B = 0.425[1] | |
| 10.30±0.23[12] · 10.7[1][3] · 10.81[4][5][7] | |
1339 Désagneauxa, provisional designation1934 XB, is a stony Eoanasteroid from the outer region of theasteroid belt, approximately 24 kilometers in diameter. It was discovered on 4 December 1934, by French astronomerLouis Boyer at the North AfricanAlgiers Observatory in Algeria.[13] A few nights later, the asteroid was independently discovered by astronomersGrigory Neujmin andEugène Delporte, at the CrimeanSimeiz and BelgianUccle Observatory, respectively.[2] It was later named after discoverer's brother-in-law.[2]
Désagneauxa is a member of theEos family, which is thought to have formed from a catastrophic collision, disrupting its parent body into thousands of fragments. It is the4th largest asteroid family with nearly 10,000 known members. The asteroid orbits the Sun in theouter main-belt at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,917 days). Its orbit has aneccentricity of 0.06 and aninclination of 9° with respect to theecliptic.[1] As noprecovery were taken, and no prior identifications were made, the body'sobservation arc begins with its official discovery at Algiers in 1934.[13]
Thisminor planet was named by the discoverer in honour of his brother-in-law.[2] The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 122).[2]
In theTholen taxonomy,Désagneauxa is a stonyS-type asteroid.[1]
In August 2008, a rotationallightcurve of this asteroid was obtained by French amateur astronomerRené Roy. Lightcurve analysis gave it arotation period of 9.3209 hours with a change in brightness of 0.48magnitude (U=2+).[8] 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).[11]
In addition modeled lightcurves, 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°) inecliptic coordinates, respectively (U=n.a.).[9][10]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Désagneauxa measures between 22.96 and 25.73 kilometers in diameter, and its surface has analbedo between 0.127 and 0.159.[4][5][6][7] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.1747 and a diameter of 23.04 kilometers with anabsolute magnitude of 10.7.[3]
