| Discovery[1] | |
|---|---|
| Discovered by | S. Belyavskyj |
| Discovery site | Simeiz Obs. |
| Discovery date | 5 September 1923 |
| Designations | |
| (1005) Arago | |
Named after | François Arago (French mathematician)[2] |
| 1923 OT | |
| main-belt · (outer)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.51 yr (34,156 days) |
| Aphelion | 3.5381AU |
| Perihelion | 2.7937 AU |
| 3.1659 AU | |
| Eccentricity | 0.1176 |
| 5.63yr (2,058 days) | |
| 206.34° | |
| 0° 10m 30s / day | |
| Inclination | 19.060° |
| 349.17° | |
| 60.660° | |
| Physical characteristics | |
| Dimensions | 48.57±14.27 km[4] 50.28±15.89 km[5] 52.74±0.89 km[6] 56.36±1.36 km[7] 57.69 km(derived)[3] 57.82±4.9 km[8] 61.132±0.345 km[9] 68.404±0.660 km[10] |
| 8.7819±0.0001h[a] 8.784±0.001 h[11] | |
| 0.0498±0.0069[10] 0.0582(derived)[3] 0.0697±0.014[8] 0.070±0.008[6] 0.074±0.004[7] 0.08±0.04[4] 0.08±0.09[5] | |
| P[10] · C[3] | |
| 9.7[7][8][10] · 9.9[1][3][4][6] · 9.98[5] | |
Arago (minor planet designation:1005 Arago), provisional designation1923 OT, is a darkasteroid from the outer regions of theasteroid belt, approximately 55 kilometers in diameter. It was discovered on 5 September 1923, by Russian astronomerSergey Belyavsky at theSimeiz Observatory on the Crimean peninsula.[12] The asteroid was named after French mathematicianFrançois Arago.[2]
Arago orbits the Sun in theouter main-belt at a distance of 2.8–3.5 AU once every 5 years and 8 months (2,058 days). Its orbit has aneccentricity of 0.12 and aninclination of 19° with respect to theecliptic.[1] The asteroid'sobservation arc begins atUccle Observatory in 1935, twelve years after its official discovery observation at Simeiz.[12]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer (WISE) with its subsequentNEOWISE mission,Arago measures between 48.57 and 68.404 kilometers (30.180 and 42.504 mi) in diameter and its surface has analbedo between 0.0498 and 0.08.[4][5][6][7][8][10] TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0582 and a diameter of 57.69 kilometers (35.85 mi) based on anabsolute magnitude of 9.9.[3]
In October 2010, a rotationallightcurve ofArago was obtained from photometric observations that was later submitted to the CALL website. Lightcurve analysis gave arotation period of 8.7819 hours with a brightness amplitude of 0.22magnitude (U=n.a.).[a] In April 2016, another lightcurve was obtained by the group of Spanish amateur astronomers OBAS. It gave a concurring period of 8.784 hours with an amplitude of 0.22 magnitude (U=3).[11]
Arago is characterized by WISE as a dark and reddishP-type asteroid. It is also a carbonaceousC-type asteroid as generically assumed by CALL.[3][10]
Thisminor planet was named after French mathematicianFrançois Arago (1786–1853) director of theParis Observatory.[2] He is also honored by aninner ring of Neptune, the craterArago on the Moon and the craterArago on Mars. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 96).[13]
