8991 Solidarity
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| Discovery[1] | |
|---|---|
| Discovered by | ESO |
| Discovery site | La Silla Obs. |
| Discovery date | 6 August 1980 |
| Designations | |
| (8991) Solidarity | |
Named after | Solidarity (in memory of 9/11)[2] |
| 1980 PV1 · 1975 QB 1979 HC1 · 1985 SD3 1988 FR3 · 1988 GW2 | |
| main-belt · (middle)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 41.57 yr (15,183 days) |
| Aphelion | 3.2956 AU |
| Perihelion | 2.2799 AU |
| 2.7877 AU | |
| Eccentricity | 0.1822 |
| 4.65 yr (1,700 days) | |
| 70.461° | |
| 0° 12m 42.48s / day | |
| Inclination | 6.7882° |
| 286.51° | |
| 312.52° | |
| Physical characteristics | |
| Dimensions | 8.385±0.342 km[4][5] 12.88 km (calculated)[3] |
| 5.2388±0.0034 h[6] | |
| 0.057 (assumed)[3] 0.174±0.022[4][5] | |
| C[3] | |
| 12.37±1.03[7] · 12.729±0.003 (R)[6] · 12.8[1] · 12.9[4] · 13.18[3] | |
8991 Solidarity, provisional designation 1980 PV1, is a carbonaceous asteroid from the middle region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 6 August 1980, by observers at ESO's La Silla Observatory site in northern Chile.[8] The asteroid was named in response to the September 11 attacks.[2]
Solidarity orbits the Sun in the central main-belt at a distance of 2.3–3.3 AU once every 4 years and 8 months (1,700 days). Its orbit has an eccentricity of 0.18 and an inclination of 7° with respect to the ecliptic.[1] The first used observation was made at Cerro El Roble Observatory in 1979, extending the body's observation arc by 1 year prior to its official discovery observation at La Silla.[8]
Physical characteristics
Rotation period
In January 2011, a rotational lightcurve of Solidarity was obtained from photometric observations at the Palomar Transient Factory in California. It gave a rotation period of 5.2388 hours with a brightness variation of 0.19 magnitude (U=2).[6]
Diameter and albedo
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Solidarity measures 8.4 kilometers in diameter and its surface has an albedo of 0.17,[4][5] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a diameter of 12.9 kilometers with an absolute magnitude of 13.18.[3]
