| Discovery[1][2] | |
|---|---|
| Discovered by | L. Oterma |
| Discovery site | Turku Obs. |
| Discovery date | 12 February 1942 |
| Designations | |
| (1680) Per Brahe | |
Named after | Per Brahe the Younger (Count and Governor)[3] |
| 1942 CH · 1934 PP 1937 AA · 1937 AY 1938 JA · 1943 PC 1949 XL · 1952 OG 1953 VD1 · 1960 FF A902 JA | |
| main-belt · (middle)[4] background[5] | |
| Orbital characteristics[2] | |
| Epoch 27 April 2019 (JD 2458600.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 117.28yr (42,838 d) |
| Aphelion | 3.2227AU |
| Perihelion | 2.2278 AU |
| 2.7252 AU | |
| Eccentricity | 0.1825 |
| 4.50 yr (1,643 d) | |
| 349.62° | |
| 0° 13m 8.76s / day | |
| Inclination | 4.2614° |
| 83.344° | |
| 158.68° | |
| Physical characteristics | |
| 13.960±0.125 km[6] 14.20±0.8 km[7] 14.848±0.130 km[8] 15.45±1.32 km[9] 18.29±0.70 km[10] | |
| 3.426±0.002 h[11] 3.428±0.002 h[4] | |
| 0.178±0.015[10] 0.2722±0.0223[8] 0.2903±0.038[7] 0.300±0.044[6] 0.407±0.294[9] | |
| SMASS =S[2][4] | |
| 10.65[9] 11.1[1][2][4] 11.2[7][8][10] | |
1680 Per Brahe, provisional designation1942 CH, is a bright backgroundasteroid from the central region of theasteroid belt, approximately 14 kilometers (9 miles) in diameter. It was discovered on 12 February 1942, by Finnish astronomerLiisi Oterma atTurku Observatory in Southwest Finland.[1] The stonyS-type asteroid has arotation period of 3.4 hours.[4] It is named after Swedish count and governorPer Brahe the Younger.[3]
TheS-type asteroid is a non-family asteroid of the main belt'sbackground population.[5] It orbits the Sun in thecentral main-belt at a distance of 2.2–3.2 AU once every 4 years and 6 months (1,643 days;semi-major axis of 2.73 AU). Its orbit has aneccentricity of 0.18 and aninclination of 4° with respect to theecliptic.[2]Per Brahe was first identified asA902 JA atHeidelberg Observatory in 1902, extending the asteroid'sobservation arc by 40 years prior to its official discovery observation.[1]
Thisminor planet was named for Swedish countPer Brahe (1602–1680), who wasGovernor General of Finland in the 17th century. His prosperous legacy saw the establishment ofAcademia Aboensis, the first university in Finland, the construction of various new towns and many schools, and the publication of the first Finnish Bible.[3] The officialnaming citation was published by theMinor Planet Center on 1 April 1980 (M.P.C. 5280).[12]
In December 2012, two rotationallightcurves ofPer Brahe were obtained by American astronomersRobert Stephens andBrian Warner. They gave a well-definedrotation period of 3.426 and 3.428 hours with a brightness variation of 0.13 and 0.017magnitude, respectively (U=3/3).[4][11] Previously, lightcurves obtained byLaurent Bernasconi andRené Roy in 2005 and 2006, gave a similar period of 3.444 and 3.44 hours, respectively.(U=2/1+).[13]
According to the surveys carried out by the Infrared Astronomical SatelliteIRAS, the JapaneseAkari satellite, and NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Per Brahe measures between 13.96 and 18.29 kilometers in diameter, and its surface has analbedo between 0.178 and 0.300.[6][7][8][9][10] TheCollaborative Asteroid Lightcurve Link derives a higher albedo of 0.341 and a diameter of 14.36 kilometers with anabsolute magnitude of 11.0.[4]
