| Discovery[1] | |
|---|---|
| Discovered by | K. Reinmuth |
| Discovery site | Heidelberg Obs. |
| Discovery date | 31 August 1929 |
| Designations | |
| (1157) Arabia | |
Named after | Arabian Peninsula[2] |
| 1929 QC · 1955 EC | |
| main-belt · (outer)[3] background[4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.58 yr (31,987 days) |
| Aphelion | 3.6412AU |
| Perihelion | 2.7221 AU |
| 3.1816 AU | |
| Eccentricity | 0.1444 |
| 5.68yr (2,073 days) | |
| 195.98° | |
| 0° 10m 25.32s / day | |
| Inclination | 9.5447° |
| 336.19° | |
| 313.37° | |
| Physical characteristics | |
| Dimensions | 29.01±0.84 km[5] 29.113±4.433 km[6] 55.67 km(calculated)[3] |
| 15.225±0.005h[a] | |
| 0.057(assumed)[3] 0.211±0.013[5] 0.247±0.242[6] | |
| C(assumed)[3] | |
| 9.82[6] · 9.89±0.22[7] · 10.00[1][3][5] | |
1157 Arabia, provisional designation1929 QC, is anasteroid from the outer regions of theasteroid belt, approximately 29 kilometers in diameter. AstronomerKarl Reinmuth discovered it at theHeidelberg Observatory in southwest Germany on 31 August 1929.[8] The asteroid was named for theArabian Peninsula.
Arabia is a non-family asteroid from the main belt'sbackground population.[4] It orbits the Sun in theouter asteroid belt at a distance of 2.7–3.6 AU once every 5 years and 8 months (2,073 days). Its orbit has aneccentricity of 0.14 and aninclination of 10° with respect to theecliptic.[1]
The body'sobservation arc begins at Heidelberg in December 1930, more than a year after its official discovery observation.[8]
Arabia is an assumed carbonaceousC-type asteroid,[3] while the measuredalbedos are rather typical for astony composition(see below).[5][6]
In June 2008, Peter Caspari obtained a rotationallightcurve ofArabia from photometric observations at the BDI Observatory (E18) near Sydney, Australia. Lightcurve analysis gave arotation period of 15.225 hours with a brightness amplitude of 0.37magnitude (U=3-).[a]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Arabia measures 29.01 and 29.113 kilometers in diameter and its surface has an albedo of 0.211 and 0.247, respectively.[5][6] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a much larger diameter of 55.67 kilometers based on anabsolute magnitude of 10.0.[3]
Thisminor planet was named after theArabian Peninsula, also known as "Arabia", inWestern Asia. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 108).[2]
