| Discovery[1] | |
|---|---|
| Discovered by | N. Chernykh |
| Discovery site | Crimean Astrophysical Obs. |
| Discovery date | 19 July 1977 |
| Designations | |
| (2228) Soyuz–Apollo | |
Named after | Apollo–Soyuz(Test Project)[2] |
| 1977 OH · 1933 SK1 1952 DT1 · 1963 DD 1973 YN3 | |
| main-belt · Themis[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 53.75 yr (19,632 days) |
| Aphelion | 3.7135AU |
| Perihelion | 2.5605 AU |
| 3.1370 AU | |
| Eccentricity | 0.1838 |
| 5.56yr (2,029 days) | |
| 341.70° | |
| 0° 10m 38.64s / day | |
| Inclination | 1.9888° |
| 140.40° | |
| 285.71° | |
| Physical characteristics | |
| Dimensions | 23.55 km(calculated)[3] 26.080±0.295 km[4][5] 28.26±0.49 km[6] |
| 5.3846±0.0007 h[7] 5.3868±0.0013 h[8] 5.4±0.05 h[7] 6.12h[9] | |
| 0.08(assumed)[3] 0.101±0.004[6] 0.113±0.020[5] 0.1134±0.0198[4] | |
| C[3] | |
| 10.9[4][6] · 11.21±0.42[10] · 11.5[1][3] · 11.848±0.002(S)[8] | |
2228 Soyuz–Apollo, provisional designation1977 OH, is a carbonaceousThemistian asteroid from the outer region of theasteroid belt, approximately 26 kilometers in diameter. It was discovered on 19 July 1977, by Soviet–Russian astronomerNikolai Chernykh at theCrimean Astrophysical Observatory in Nauchnyj on the Crimean peninsula.[11] It was named after theApollo–Soyuz Test Project.[2]
The darkC-type asteroid is a member of theThemis family, a dynamical family of outer-belt asteroids with nearly coplanarecliptical orbits. It orbits the Sun in theouter main-belt at a distance of 2.6–3.7 AU once every 5 years and 7 months (2,029 days). Its orbit has aneccentricity of 0.18 and aninclination of 2° with respect to theecliptic.[1]
It has arotation period of 5.4 hours and analbedo of 0.10 and 0.11, as determined by the space-basedAkari andWISE missions, respectively,[6][4] while the Collaborative Asteroid Lightcurve Link (CALL) assumes a lower albedo of 0.08.[3]
Thisminor planet was named after the joint Soviet-American space flight, theApollo–Soyuz Test Project, carried on in 1975. The reversal of the names, "Soyuz–Apollo" rather than "Apollo–Soyuz", was not political, but to prevent confusion with the asteroid1862 Apollo.[2] The official naming citation was published by theMinor Planet Center on 1 March 1981 (M.P.C. 5850).[12]
