| Discovery[1] | |
|---|---|
| Discovered by | ESO |
| Discovery site | La Silla Obs. |
| Discovery date | 6 August 1980 |
| Designations | |
| (8991) Solidarity | |
Named after | Solidarity (in memory of9/11)[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 | 3.2956AU |
| Perihelion | 2.2799 AU |
| 2.7877 AU | |
| Eccentricity | 0.1822 |
| 4.65yr (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±0.0034h[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 designation1980 PV1, is a carbonaceousasteroid from the middle region of theasteroid belt, approximately 10 kilometers in diameter. It was discovered on 6 August 1980, by observers atESO'sLa Silla Observatory site in northern Chile.[8] The asteroid was named in response to theSeptember 11 attacks.[2]
Solidarity orbits the Sun in thecentral main-belt at a distance of 2.3–3.3 AU once every 4 years and 8 months (1,700 days). Its orbit has aneccentricity of 0.18 and aninclination of 7° with respect to theecliptic.[1] The first used observation was made atCerro El Roble Observatory in 1979, extending the body'sobservation arc by 1 year prior to its official discovery observation at La Silla.[8]
In January 2011, a rotationallightcurve ofSolidarity was obtained from photometric observations at thePalomar Transient Factory in California. It gave arotation period of5.2388 hours with a brightness variation of 0.19magnitude (U=2).[6]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Solidarity measures 8.4 kilometers in diameter and its surface has analbedo of 0.17,[4][5] while theCollaborative Asteroid Lightcurve Link assumes a standard albedo forcarbonaceous asteroids of 0.057 and calculates a diameter of 12.9 kilometers with anabsolute magnitude of 13.18.[3]
Thisminor planet was named "Solidarity" in response to theSeptember 11 attacks. As a commemorative gesture, theIAU's Committee for the Nomenclature of Small Bodies chose three objects discovered inobservatories on different continents and christened them with names representing some of the most basic and universal human values. The other two selections were8990 Compassion (discovered from Europe) and8992 Magnanimity (discovered from Asia).[2] The official naming citation was published by theMinor Planet Center on 2 October 2001 (M.P.C. 43684).[9]
