| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 2 September 1929 |
| Designations | |
| (1159) Granada | |
Named after | Granada [2] (Spanish city and province) |
| 1929 RD · 1931 AR 1940 RS | |
| main-belt · (inner)[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.84 yr (32,083 days) |
| Aphelion | 2.5184AU |
| Perihelion | 2.2409 AU |
| 2.3797 AU | |
| Eccentricity | 0.0583 |
| 3.67yr (1,341 days) | |
| 35.176° | |
| 0° 16m 6.6s / day | |
| Inclination | 13.031° |
| 347.89° | |
| 313.33° | |
| Physical characteristics | |
| Dimensions | 27.839±0.283 km[4] 28.641±0.460 km[5] 29.94 km(derived)[3] 29.98±0.9 km[6] 30.14±9.34 km[7] 30.26±0.11 km[8] 30.26±0.29 km[9] 34.65±12.83 km[10] |
| 31h[11] 72.852±0.2429 h[12] | |
| 0.028±0.014[10] 0.031±0.002[4] 0.0379±0.0038[5] 0.04±0.00[8] 0.04±0.02[7] 0.0439(derived)[3] 0.047±0.001[9] 0.0471±0.003[6] | |
| S(assumed)[3] B–V = 0.680[1] U–B = 0.360[1] | |
| 11.385±0.001(R)[12] · 11.55[1][6][7][9] · 11.58[8] · 11.63[3][5][11] · 11.78±0.43[13] · 11.81[10] | |
1159 Granada, provisional designation1929 RD, is a dark backgroundasteroid and relatively slow rotator from the inner regions of theasteroid belt, approximately 30 kilometers in diameter. It was discovered on 2 September 1929, by astronomerKarl Reinmuth at theHeidelberg Observatory in southwest Germany.[14] The asteroid was named for the Spanish city and province ofGranada.[2]
Granada is a background asteroid that does not belong to any knownasteroid family. It orbits the Sun in theinner main-belt at a distance of 2.2–2.5 AU once every 3 years and 8 months (1,341 days). Its orbit has aneccentricity of 0.06 and aninclination of 13° with respect to theecliptic.[1] The body'sobservation arc begins nine days after its official discovery observation at Heidelberg.[14]
AlthoughGranada is an assumedS-type asteroid,[3] it has a notably low albedo(see below) for an asteroid of the inner main-belt, even below that of mostcarbonaceous asteroids.
In September 1984, a rotationallightcurve ofGranada was obtained from photometric observations by astronomerRichard Binzel. Lightcurve analysis gave arotation period of 31 hours with a brightness variation of 0.28magnitude (U=2).[11] In October 2010, photometric observations in the R-band by astronomers at thePalomar Transient Factory gave a period of 72.852 hours and an amplitude of 0.24 (U=2).[12] While not being aslow rotator,Granada's period is significantly longer than the typical 2 to 20 hours measures for most asteroids.
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Granada measures between 27.839 and 34.65 kilometers in diameter and its surface has a lowalbedo between 0.028 and 0.0471.[4][5][6][7][8][9][10]
TheCollaborative Asteroid Lightcurve Link derives an albedo of 0.0439 and a diameter of 29.94 kilometers based on anabsolute magnitude of 11.63.[3]
Thisminor planet was named afterGranada, city and province in Andalusia in southern. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 108).[2]
