| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 26 April 1941 |
| Designations | |
| (2091) Sampo | |
Named after | Sampo (Finnish mythology)[2] |
| 1941 HO · 1931 MG 1938 UF1 · 1951 GA1 1952 LB · 1956 EP 1971 BH1 · 1978 NB A924 BB | |
| main-belt · (outer) Eos[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 93.06 yr (33,989 days) |
| Aphelion | 3.1985AU |
| Perihelion | 2.8300 AU |
| 3.0143 AU | |
| Eccentricity | 0.0611 |
| 5.23yr (1,911 days) | |
| 359.61° | |
| 0° 11m 17.88s / day | |
| Inclination | 11.378° |
| 114.53° | |
| 318.84° | |
| Physical characteristics | |
| Dimensions | 23.024±0.474 km[5] 23.493±0.240 km[6] 30.25 km(derived)[3] 30.48±1.3 km[7] 35.47±0.45 km[8] |
| 71.34±0.05h[9] | |
| 0.118±0.003[8] 0.1218(derived)[3] 0.1582±0.014[7] 0.2683±0.0325[6] 0.277±0.019[5] | |
| S[3] | |
| 10.2[6][7][8] · 10.5[1][3] | |
2091 Sampo (provisional designation1941 HO), is a stonyEosasteroid and relativelyslow rotator from the outer region of theasteroid belt, approximately 30 kilometers in diameter. It was discovered on 26 April 1941, by Finnish astronomerYrjö Väisälä atTurku Observatory, Finland, and named afterSampo from Finnish mythology.[10]
Sampo is a member of theEos family (606), the largestasteroid family in theouter main belt consisting of nearly 10,000 asteroids.[4][11]: 23 It orbits the Sun in at a distance of 2.8–3.2 AU once every 5 years and 3 months (1,911 days). Its orbit has aneccentricity of 0.06 and aninclination of 11° with respect to theecliptic.[1]
TheS-type asteroid measures between 23.0 and 35.5 kilometers in diameter, and its surface has analbedo between 0.118 and 0.277, according to the surveys carried out byIRAS,Akari, andNEOWISE.[5][6][7][8]
A rotationallightcurve ofSampo was obtained from photometric observations made by astronomersRené Roy,Laurent Bernasconi and Stéphane Charbonnelat in March 2003. It gave a potentially longrotation period of71.34±0.05 hours with a brightness variation of 0.38magnitude (U=2).[9]
Thisminor planet was named after the wonder-objectSampo from Finnish mythology. It is mentioned in the national oral folklore and mythology epic,Kalevala, after which the minor planet1454 Kalevala is named. Sampo was to produce every kind of fortune. When Kalevala and Pohjola(also see3606 Pohjola) were fighting for its possession it broke into pieces.[2] The official naming citation was published by theMinor Planet Center on 1 August 1980 (M.P.C. 5450).[12]
