| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 8 August 1932 |
| Designations | |
| (1258) Sicilia | |
| Pronunciation | /sɪˈsɪliə/[2] |
Named after | Sicily(Italian island)[3] |
| 1932 PG · 1935 BG | |
| main-belt · (outer)[4] background[5] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 85.22 yr (31,128 days) |
| Aphelion | 3.3218AU |
| Perihelion | 3.0484 AU |
| 3.1851 AU | |
| Eccentricity | 0.0429 |
| 5.68yr (2,076 days) | |
| 304.82° | |
| 0° 10m 24.24s / day | |
| Inclination | 7.7022° |
| 299.61° | |
| 77.861° | |
| Physical characteristics | |
| Dimensions | 36.83±13.91 km[6] 41.94±12.35 km[7] 44.39 km(derived)[4] 44.47±2.4 km[8] 44.86±0.75 km[9] 45.669±0.174 km[10] 52.529±0.192 km[11] |
| 13.500±0.003h[12] | |
| 0.0369±0.0037[11] 0.0470(derived)[4] 0.050±0.009[10] 0.056±0.002[9] 0.0564±0.007 0.06±0.04[7] 0.07±0.05[6] | |
| C(assumed)[4] | |
| 10.50[8][9] · 10.60[6][11] · 10.7[1][4] · 10.77[7] · 10.89±0.32[13] | |
1258 Sicilia, provisional designation1932 PG, is a dark backgroundasteroid from the outer regions of theasteroid belt, approximately 44 kilometers in diameter. It was discovered on 8 August 1932, by astronomerKarl Reinmuth at theHeidelberg-Königstuhl State Observatory in southwest Germany.[14] The asteroid was named after the Italian island ofSicily.[3]
Sicilia is a non-family asteroid of the main belt'sbackground population.[5] It orbits the Sun in theouter asteroid belt at a distance of 3.0–3.3 AU once every 5 years and 8 months (2,076 days;semi-major axis of 3.19 AU). Its orbit has aneccentricity of 0.04 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Heidelberg in 1932.[14]
Sicilia is an assumed carbonaceousC-type asteroid.[4]
In May 2010, a first rotationallightcurve ofSicilia was obtained from photometric observations by astronomers at the Oakley Southern Sky Observatory (E09) in Australia. Lightcurve analysis gave arotation period of 13.500 hours with a brightness amplitude of 0.19magnitude (U=3-).[12]
According to the surveys carried out by the JapaneseAkari satellite, theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer, and the Infrared Astronomical SatelliteIRAS,Sicilia measures between 36.83 and 52.529 kilometers in diameter and its surface has analbedo between 0.0369 and 0.07.[6][8][7][9][10][11]
TheCollaborative Asteroid Lightcurve Link largely agrees with IRAS and derives an albedo of 0.0470 and a diameter of 44.39 kilometers based on anabsolute magnitude of 10.7.[4]
Thisminor planet was named after the Italian island ofSicily in theMediterranean Sea. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 116).[3]
