| Discovery[1] | |
|---|---|
| Discovered by | Y. Väisälä |
| Discovery site | Turku Obs. |
| Discovery date | 22 February 1938 |
| Designations | |
| (1451) Grano | |
Named after | Johannes Gabriel Granö (University of Turku)[2] |
| 1938 DT · 1976 WK | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 56.21 yr (20,532 days) |
| Aphelion | 2.4619AU |
| Perihelion | 1.9442 AU |
| 2.2030 AU | |
| Eccentricity | 0.1175 |
| 3.27yr (1,194 days) | |
| 60.928° | |
| 0° 18m 5.04s / day | |
| Inclination | 5.1087° |
| 175.29° | |
| 51.858° | |
| Physical characteristics | |
| Dimensions | 6.170±0.072[4] 6.329±0.037 km[5] 6.81 km(calculated)[3] 9.70±0.57 km[6] |
| 5.109h(removed)[a] 138±0.05 h[7] | |
| 0.171±0.022[6] 0.20(assumed)[3] 0.4034±0.0919[5] 0.429±0.077[4] | |
| S[3][8] | |
| 12.6[5][6] · 13.2[1][3] · 14.19±0.95[8] | |
1451 Granö, provisional designation1938 DT, is a stony Florianasteroid andslow rotator from the inner regions of theasteroid belt, approximately 6.5 kilometers in diameter. It was discovered on 22 February 1938, by Finnish astronomerYrjö Väisälä atTurku Observatory in Southwest Finland, and later named forJohannes Gabriel Granö, rector of theUniversity of Turku.[9]
The asteroid is a member of theFlora family, a large group of stonyS-type asteroids in the main-belt. It orbits the Sun in theinner main-belt at a distance of 1.9–2.5 AU once every 3 years and 3 months (1,194 days). Its orbit has aneccentricity of 0.12 and aninclination of 5° with respect to theecliptic.[1] As noprecoveries were taken, and no previous identifications were made,Granö'sobservation arc begins with its official discovery observation in 1938.[9]
A rotationallightcurve ofGranö was obtained from photometric observations made by amateur astronomerRobert Stephens at GMARS and Santana Observatories in March 2010. Analysis gave a longrotation period of 138 hours with a brightness variation of 0.65magnitude (U=2+).[7] This makesGranö aslow rotating asteroid. The result supersedes a previous period of 5.1 hours from May 2007 (U=2-).[a]
According to the surveys carried out by the JapaneseAkari satellite and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Granö measures between 6.17 and 9.70 kilometers in diameter, and its surface has analbedo between 0.171 and 0.429.[4][5][6] TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 6.81 kilometers using anabsolute magnitude of 13.2.[3]
Thisminor planet was named afterJohannes Gabriel Granö (1882−1956), Finnish professor of geography and rector atUniversity of Turku from 1932 to 1934.[2] The officialnaming citation was published by theMinor Planet Center on 30 January 1964 (M.P.C. 2277).[10]
