| Discovery[1] | |
|---|---|
| Discovered by | S. Belyavskyj |
| Discovery site | Simeiz Obs. |
| Discovery date | 12 September 1923 |
| Designations | |
| (1006) Lagrangea | |
| Pronunciation | /ləˈɡrɒndʒiə/[2] |
Named after | Joseph-Louis Lagrange (Italian astronomer)[3] |
| 1923 OU | |
| main-belt · (outer)[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.73 yr (34,235 days) |
| Aphelion | 4.2641AU |
| Perihelion | 2.0210 AU |
| 3.1425 AU | |
| Eccentricity | 0.3569 |
| 5.57yr (2,035 days) | |
| 283.17° | |
| 0° 10m 36.84s / day | |
| Inclination | 10.917° |
| 294.59° | |
| 86.231° | |
| Physical characteristics | |
| Dimensions | 29.53 km(derived)[4] 29.56±2.3 km[5] 30.36±6.84 km[6] 32.24±1.16 km[7] 35.310±0.345 km[8][9] |
| 32.79±0.06h[10] | |
| 0.046±0.006[8] 0.0469±0.0064[9] 0.058±0.005[7] 0.06±0.03[6] 0.0612(derived)[4] 0.0670±0.012[5] | |
| D[11] · C[4] | |
| 11.20[5][7][9] · 11.30[1][4][6] · 11.36±0.19[11] | |
Lagrangea (minor planet designation:1006 Lagrangea), provisional designation1923 OU, is a carbonaceous backgroundasteroid from the outer region of theasteroid belt, approximately 30 kilometers in diameter. It was discovered on 12 September 1923, by Russian astronomerSergey Belyavsky at theSimeiz Observatory on the Crimean peninsula.[12] The asteroid was named after Italian mathematician and astronomerJoseph-Louis Lagrange.[3]
Lagrangea is not a member of any knownasteroid family. It orbits the Sun in theouter main belt at a distance of 2.0–4.3 AU once every 5 years and 7 months (2,035 days). Its orbit has aneccentricity of 0.36 and aninclination of 11° with respect to theecliptic.[1] The body'sobservation arc begins at the discovering observatory, 4 days after its official discovery observation.[12]
Lagrangea has been characterized as a darkD-type asteroid byPan-STARRS photometric survey, while the LCDB assumes a generic, carbonaceousC-type.[4][11]
In September 2001, a rotationallightcurve ofLagrangea was obtained from photometric observations by French amateur astronomerLaurent Bernasconi. Lightcurve analysis gave a longer-than-averagerotation period of 32.79 hours with a brightness amplitude of 0.17magnitude.[10] As the lightcurve has received a low quality rating, the obtained period must be considered tentative (U=1).[4]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Lagrangea measures between 29.56 and 35.31 kilometers in diameter and its surface has analbedo between 0.046 and 0.067.[5][6][7][8][9]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0612 and a diameter of 29.53 kilometers based on anabsolute magnitude of 11.3.[4]
Thisminor planet was named after Italian mathematicianJoseph-Louis Lagrange (1736–1813), who made significantcontributions to astronomy, in particularcelestial mechanics. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 96). TheLagrangian points are named after him. He is also honored by the lunar craterLagrange.[3]
