| Discovery[1] | |
|---|---|
| Discovered by | C. Torres S. Cofré |
| Discovery site | Cerro El Roble Stn. |
| Discovery date | 18 July 1968 |
| Designations | |
| (2028) Janequeo | |
Named after | Janequeo (or Yanequén) (Mapuche heroine)[2] |
| 1968 OB1 | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 47.89 yr (17,491 days) |
| Aphelion | 2.5550AU |
| Perihelion | 2.0382 AU |
| 2.2966 AU | |
| Eccentricity | 0.1125 |
| 3.48yr (1,271 days) | |
| 70.128° | |
| 0° 16m 59.52s / day | |
| Inclination | 7.9558° |
| 242.80° | |
| 27.574° | |
| Physical characteristics | |
| Dimensions | 2.45 km(calculated)[3] 3.201±0.290 km[4][5] |
| 2.480±0.0002h[6] | |
| 0.24(assumed)[3] 0.273±0.070[4][5] | |
| S[3] | |
| 14.5[4] · 14.769±0.004(R)[6] · 14.79±0.38[7] · 14.8[1] · 15.22[3] | |
2028 Janequeo, provisional designation1968 OB1, is a stony Florianasteroid from the inner regions of theasteroid belt, approximately 3 kilometers in diameter. It was discovered on July 18, 1968, by Chilean astronomersCarlos Torres andS. Cofre at theCerro El Roble Station of Chile'sNational Astronomical Observatory.[8] The asteroid named after the indigenous heroineJanequeo (Yanequén).[2]
Janequeo is a member of theFlora family, one of the largest collisional populations ofstony asteroids. It orbits the Sun in theinner main-belt at a distance of 2.0–2.6 AU once every 3 years and 6 months (1,271 days). Its orbit has aneccentricity of 0.11 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins at the discovering observatory one night after its official discovery observation on 19 July 1968.[8]
In August 2010, a rotationallightcurve ofJanequeo was obtained from photometric observations by astronomers at thePalomar Transient Factory in California. Lightcurve analysis gave a shortrotation period of 2.480 hours with a brightness amplitude of 0.27magnitude (U=2).[6]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Janequeo measures 3.201 kilometers in diameter and its surface has analbedo of 0.273.[4][5] TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.24 – derived from8 Flora, the largest member and namesake of the Flora family – and calculates a diameter of 2.45 kilometers based on anabsolute magnitude of 15.22.[3]
Thisminor planet was named afterJanequeo (Yanequén), a heroine and leader of the nativeMapuche people of Chile. After her husband Huepotaén died in battle against the colonial Spaniards during theArauco War in the 16th century, she became tribal chief and brought together various rebellious tribes.[2] The approved naming citation was published by theMinor Planet Center on 1 June 1980 (M.P.C. 5359).[9]
