| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 22 April 1941 |
| Designations | |
| (1567) Alikoski | |
Named after | Heikki Alikoski(astronomer)[2] |
| 1941 HN · 1947 HE 1947 HG · 1948 OC | |
| main-belt · (outer)[1] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 78.55 yr (28,691 days) |
| Aphelion | 3.4785AU |
| Perihelion | 2.9417 AU |
| 3.2101 AU | |
| Eccentricity | 0.0836 |
| 5.75yr (2,101 days) | |
| 135.05° | |
| 0° 10m 17.04s / day | |
| Inclination | 17.279° |
| 51.454° | |
| 110.87° | |
| Physical characteristics | |
| Dimensions | 62.36±17.29 km[3] 67.83±2.1 km(IRAS:12)[4] 67.933±0.584 km[5] 69.242±0.432 km[6] 70.06±0.80 km[7] 77.10±19.58 km[8] |
| 16.405±0.01h[9] | |
| 0.04±0.03[8] 0.05±0.04[3] 0.059±0.002[6][7] 0.0624±0.0160[5] 0.0626±0.004(IRAS:12)[4] | |
| PU(Tholen)[1] C(SMASS)[1] · C[10] B–V = 0.720[1] | |
| 9.47[1][3][4][5][7][8][10] | |
1567 Alikoski (provisional designation1941 HN) is a rare-type carbonaceousasteroid from the outer region of theasteroid belt, approximately 67 kilometers in diameter. It was discovered on 22 April 1941, by Finnish astronomerYrjö Väisälä atTurku Observatory in Southwest Finland.[11] It was later named after Finnish astronomerHeikki Alikoski.[2]
This asteroid orbits the Sun in theouter main-belt at a distance of 2.9–3.5 AU once every 5 years and 9 months (2,101 days). Its orbit has aneccentricity of 0.08 and aninclination of 17° with respect to theecliptic.[1] Alikoski'sobservation arc begins with aprecovery taken at Turku in 1938, extending it by 3 years prior to the asteroid's official discovery observation.[11]
Alikoski is characterized as both a carbonaceousC-type asteroid and as a rarePU-type in theSMASS andTholen taxonomic scheme, respectively.[1]
In March 2004, a rotationallightcurve of Alikoski was obtained by American amateur astronomerRobert Stephens at Santana Observatory in California. Lightcurve analysis gave a well-definedrotation period of 16.405 hours with a brightness variation of 0.16magnitude (U=3).[9]
According to the space-based surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission, Alikoski measures between 62.36 and 77.10 kilometers in diameter, and its surface has a lowalbedo between 0.04 and 0.062.[3][4][5][6][7][8] TheCollaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0626 and a diameter of 67.83 kilometers based on anabsolute magnitude of 9.47.[10]
Thisminor planet was named in honor of Finnish astronomerHeikki Alikoski (1912–1997), assistant to the discoverer from 1937 to 1956, and an observer anddiscoverer of minor planets himself. He also helped greatly in establishing the Turku Astronomical-Optical Institute.[2] The officialnaming citation was published by theMinor Planet Center on 20 February 1976 (M.P.C. 3930).[12]
