| Discovery[1] | |
|---|---|
| Discovered by | D. J. Asher |
| Discovery site | Siding Spring Obs. |
| Discovery date | 3 February 1995 |
| Designations | |
| (9084) Achristou | |
Named after | Apostolos Christou (British astronomer)[2] |
| 1995 CS1 · 1980 GV1 | |
| main-belt · Hungaria[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 36.64 yr (13,381 days) |
| Aphelion | 2.0048AU |
| Perihelion | 1.7145 AU |
| 1.8597 AU | |
| Eccentricity | 0.0780 |
| 2.54yr (926 days) | |
| 206.11° | |
| 0° 23m 18.96s / day | |
| Inclination | 23.098° |
| 197.54° | |
| 72.116° | |
| Earth MOID | 0.7794 AU |
| Physical characteristics | |
| Dimensions | 1.76 km(calculated)[3] 1.916±0.367 km[4][5] |
| 8.84±0.02h[6][a] | |
| 0.30(assumed)[3] 0.333±0.078[4][5] | |
| E[3] | |
| 15.7[1][3] · 15.4[4] · 16.08±0.28[7] | |
9084 Achristou (provisional designation1995 CS1) is a stony Hungariaasteroid from the innermost regions of theasteroid belt, about 1.9 kilometers in diameter. It was discovered by British astronomerDavid J. Asher atSiding Spring Observatory in New South Wales, Australia, on 3 February 1995.[8] The asteroid was named after British planetary astronomerApostolos Christou.[2]
Achristou is a member of theHungaria family, which form theinnermost dense concentration of asteroids in the Solar System. It orbits the Sun at a distance of 1.7–2.0 AU once every 2 years and 6 months (926 days). Its orbit has aneccentricity of 0.08 and aninclination of 23° with respect to theecliptic.[1] In April 1980, it was first identified as1980 GV1 atPalomar Observatory, extending the body'sobservation arc by 15 years prior to its official discovery observation at Siding Spring.[8]
Achristou has been characterized as a brightE-type asteroid.[3]
In May 2013, a rotationallightcurve of Achristou was obtained from photometric observations by American astronomerRobert Stephens at the Center for Solar System Studies (U81) in California. Lightcurve analysis gave arotation period of8.84 hours with a low brightness variation of 0.09magnitude (U=2+).[6][a]
Based on the survey carried out by theNEOWISE mission of NASA's space-basedWide-field Infrared Survey Explorer, Achristou measures 1.9 kilometers in diameter and its surface has analbedo of 0.33,[4][5] while theCollaborative Asteroid Lightcurve Link assumes an albedo of 0.30 and calculates a diameter of 1.8 kilometers with anabsolute magnitude of 15.7.[3]
Thisminor planet was named after Apostolos Christou (born 1968), planetary astronomer and programmer at the North IrishArmagh Observatory, after which the minor planet10502 Armaghobs was named. His field or research include minor planets in co-orbit with Venus, designing near-Earth asteroids missions, the dwarf planet1 Ceres, meteor impacts on Venus, as well as the irregular satellite families of the outer planets.[2] The official naming citation was published by theMinor Planet Center on 23 May 2005(M.P.C. 54173).[9]
