| Discovery[1] | |
|---|---|
| Discovered by | S. Belyavskyj |
| Discovery site | Simeiz Obs. |
| Discovery date | 4 August 1926 |
| Designations | |
| (1065) Amundsenia | |
Named after | Roald Amundsen[2] (Norwegian polar explorer) |
| 1926 PD · 1930 XL 1955 QE · 1955 RD 1955 SM1 | |
| Mars-crosser[1][3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 91.15 yr (33,294 days) |
| Aphelion | 3.0617AU |
| Perihelion | 1.6604 AU |
| 2.3611 AU | |
| Eccentricity | 0.2968 |
| 3.63yr (1,325 days) | |
| 38.699° | |
| 0° 16m 18.12s / day | |
| Inclination | 8.3607° |
| 330.34° | |
| 353.68° | |
| Mars MOID | 0.2734 AU |
| Physical characteristics | |
| Dimensions | 8.85±0.15 km[5] 9.75 km(derived)[4] 12.40±2.48 km[6] |
| 7.7594±0.0002h[a] | |
| 0.151±0.060[6] 0.20(assumed)[4] 0.399±0.016[5] | |
| SMASS =S[1][4] | |
| 11.90[5] · 11.97±0.08(R)[a] · 12.20[1][6] · 12.43±0.37[7] · 12.46[4] · 12.46±0.094[8] | |
1065 Amundsenia, provisional designation1926 PD, is a stonyasteroid and sizeableMars-crosser on an eccentric orbit from the innerasteroid belt, approximately 10 kilometers in diameter. It was discovered on 4 August 1926, by Soviet astronomerSergey Belyavsky at theSimeiz Observatory on the Crimean peninsula.[3] The asteroid was named after Norwegian polar explorerRoald Amundsen.[2]
Amundsenia is aMars-crossing asteroid, a member of the dynamically unstable group, located between themain belt andnear-Earth populations, and crossing the orbit ofMars at 1.666 AU. It orbits the Sun in theinnermost asteroid belt at a distance of 1.7–3.1 AU once every 3 years and 8 months (1,325 days). Its orbit has aneccentricity of 0.30 and aninclination of 8° with respect to theecliptic.[1] The body'sobservation arc begins at Simeiz Observatory with its official discovery observation in 1926.[3]
In theSMASS classification,Amundsenia is a common stonyS-type asteroid.[1]
In November 2006, a rotationallightcurve ofAmundsenia was obtained from photometric observations byPetr Pravec atOndřejov Observatory in the Czech Republic. Lightcurve analysis gave a well-definedrotation period of 7.7594 hours with a brightness amplitude between 0.14 and 0.16magnitude (U=3).[a]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Amundsenia measures between 8.85 and 12.40 kilometers in diameter and its surface has analbedo between 0.151 and 0.399.[5][6] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and derives a diameter of 9.75 kilometers based on anabsolute magnitude of 12.46.[4]
With a diameter of approximately 10 kilometers,Amundsenia is one of the largest mid-sizedMars-crossing asteroids such as1139 Atami (9.35 km),1474 Beira (14.9 km),1011 Laodamia (7.39 km),1727 Mette (est 9 km),1131 Porzia (7.13 km),1235 Schorria (est. 9 km),985 Rosina (8.18 km)1310 Villigera (15.24 km), and1468 Zomba (7 km); but still smaller than the largest members of this group, namely,132 Aethra,323 Brucia,1508 Kemi,2204 Lyyli and512 Taurinensis, which are larger than 20 kilometers in diameter (in one or other given source).
Thisminor planet was named afterRoald Amundsen (1872–1928), the prolific Norwegianpolar explorer of both theArctic and Antarctic regions. He was the first to reach theSouth Pole in December 1911. He died during the rescue mission ofAirshipItalia in 1928. The official naming citation was mentioned inThe Names of the Minor Planets byPaul Herget in 1955 (H 101). He is also honored by a lunar craterAmundsen.[2]
