| Discovery[1] | |
|---|---|
| Discovered by | E. Delporte |
| Discovery site | Uccle Obs. |
| Discovery date | 18 August 1933 |
| Designations | |
| (1280) Baillauda | |
Named after | Jules Baillaud[2] (French astronomer) |
| 1933 QB · 1931 HE 1946 SF · 1959 UK 1961 AN · A912 GB | |
| main-belt · (outer)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 84.12 yr (30,725 days) |
| Aphelion | 3.5842AU |
| Perihelion | 3.2431 AU |
| 3.4136 AU | |
| Eccentricity | 0.0500 |
| 6.31yr (2,304 days) | |
| 61.729° | |
| 0° 9m 22.68s / day | |
| Inclination | 6.4598° |
| 293.06° | |
| 98.986° | |
| Physical characteristics | |
| Dimensions | 50.83±2.0 km[3][5] 53.97±0.72 km[6] |
| 12.6h[7] | |
| 0.045±0.001[6] 0.0505±0.004[3][5] | |
| Tholen =X[1] P(derived from Tholen)[3] B–V = 0.671[1] U–B = 0.360[1] | |
| 9.99±0.22[8] · 10.33[1][3][5][6] | |
1280 Baillauda, provisional designation1933 QB, is a dark backgroundasteroid from the outermost region of theasteroid belt, approximately 52 kilometers in diameter. Discovered byEugène Delporte atUccle Observatory in 1933, the asteroid was named after French astronomerJules Baillaud.[9]
Baillauda was discovered by Belgian astronomerEugène Delporte at theRoyal Observatory of Belgium in Uccle on 18 August 1933.[9] On the following night, it was independently discovered by Soviet astronomerGrigory Neujmin atSimeiz Observatory on the Crimean peninsula.[2] TheMinor Planet Center only recognizes the first discoverer.[9]
The asteroid was first identified asA912 GB atHeidelberg Observatory in April 1912. The body'sobservation arc begins with its official discovery observation at Uccle in August 1933.[9]
Baillauda is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theouter asteroid belt at a distance of 3.2–3.6 AU once every 6 years and 4 months (2,304 days;semi-major axis of 3.41). Its orbit has aneccentricity of 0.05 and aninclination of 6° with respect to theecliptic.[1]
In theTholen classification,Baillauda is anX-type asteroid.[1] The Lightcurve Data Base amends this Tholenspectral type and derives a primitiveP-type based on the asteroid's low albedo(see below).[3]
In August 1990, a rotationallightcurve ofBaillauda was obtained from photometric observations by Swedish astronomerClaes-Ingvar Lagerkvist in a collaboration with other European astronomers. The observations were taken with the 1.5-meter telescope at the Loiano Observatory in Italy (598). Lightcurve analysis gave arotation period of 12.6 hours with a brightness amplitude of 0.25magnitude (U=2).[7]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS and the JapaneseAkari satellite,Baillauda measures 50.83 and 53.97 kilometers in diameter and its surface has analbedo of 0.0505 and 0.045, respectively.[5][6] TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is an albedo of 0.0505 and a diameter of 50.83 kilometers based on anabsolute magnitude of 10.33.[3]
Thisminor planet was named after French astronomerJules Baillaud (1876–1960), who led thePic du Midi Observatory in the French Pyrenees (1937–1947), after his stay at the observatories at Paris and Lyons (513).[2] Jules was the son of prolific astronomerBenjamin Baillaud (1848–1934), after whom the lunar craterBaillaud was named.
The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 117).[2]
