| Discovery[1] | |
|---|---|
| Discovered by | L. Kohoutek |
| Discovery site | Hamburg Observatory |
| Discovery date | 14 January 1972 |
| Designations | |
| (1842) Hynek | |
Named after | Hynek Kohoutek (father of discoverer)[2] |
| 1972 AA · 1928 DE 1929 SO · 1952 DN2 1953 UV · 1962 EA 1963 SS · 1964 YF 1966 HE · 1969 EG1 2004 TE363 | |
| main-belt · Flora[3] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.59 yr (31,992 days) |
| Aphelion | 2.6758AU |
| Perihelion | 1.8568 AU |
| 2.2663 AU | |
| Eccentricity | 0.1807 |
| 3.41yr (1,246 days) | |
| 339.54° | |
| 0° 17m 20.04s / day | |
| Inclination | 5.3539° |
| 153.45° | |
| 125.55° | |
| Physical characteristics | |
| Dimensions | 7.996±0.073[4] 8.171±0.027 km[5] 9.31±1.70 km[6] 9.80 km(calculated)[3] |
| 3.94±0.02h[7] 3.9410±0.0007 h[7] | |
| 0.20(assumed)[3] 0.28±0.14[6] 0.2899±0.0415[5] 0.300±0.073[4] | |
| Tholen =S[1] · S[3][8] B–V = 0.871[1] U–B = 0.522[1] | |
| 12.41[1][3][5][6] · 12.89±0.41[8] | |
1842 Hynek, provisional designation1972 AA, is a stonyFlorianasteroid from the inner regions of theasteroid belt, approximately 8 kilometers in diameter.
The asteroid was discovered on 14 January 1972 byCzech astronomerLuboš Kohoutek atHamburg Observatory, who named it after his father, Hynek Kohoutek.[9]
Hynek is member of theFlora family. It orbits the Sun in theinner main-belt at a distance of 1.9–2.7 AU once every 3 years and 5 months (1,246 days). Its orbit has aneccentricity of 0.18 and aninclination of 5° with respect to theecliptic.[1]
First identified as1928 DE atHeidelberg, the asteroid'sobservation arc begins with its first used observation taken atLowell Observatory in 1929, when it was identified as1929 SO, nearly 43 years prior to its official discovery observation at Hamburg.[9]
In theTholen classification,Hynek is characterized as a commonS-type asteroid.[1]
In July 2007, the so-far best rated rotationallightcurve ofHynek was obtained from photometric observations by French amateur astronomerPierre Antonini. Lightcurve analysis gave a well-definedrotation period of 3.9410 hours with a brightness variation of 0.17magnitude (U=3).[7]
According to the surveys carried out by NASA'sWide-field Infrared Survey Explorer with its subsequentNEOWISE mission,Hynek measures between 7.996 and 9.31 kilometers in diameter, and its surface has analbedo between 0.28 of 0.300.[4][5][6]
TheCollaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 9.80 kilometers with anabsolute magnitude of 12.41.[3]
Thisminor planet was named after Hynek Kohoutek, the father of the discoverer, celebrating his 70th birthday.[2] The officialnaming citation was published by theMinor Planet Center on 20 December 1974 (M.P.C. 3757).[10]
