1693 Hertzsprung
| Discovery | |
|---|---|
| Discovered by | H. van Gent |
| Discovery site |
Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 5 May 1935 |
| Designations | |
| MPC designation | 1693 Hertzsprung |
|
Named after
|
Ejnar Hertzsprung (chemist, astronomer) |
| 1935 LA · 1930 HG 1944 HA · 1950 VM |
|
| main-belt · (middle) | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 81.52 yr (29,774 days) |
| Aphelion | 3.5605 AU |
| Perihelion | 2.0314 AU |
| 2.7959 AU | |
| Eccentricity | 0.2735 |
| 4.68 yr (1,708 days) | |
| 121.96° | |
| 0° 12m 38.88s / day | |
| Inclination | 11.941° |
| 69.987° | |
| 234.96° | |
| Physical characteristics | |
| Dimensions |
35.27±0.47 km 37.772±0.320 38.67±1.5 km (IRAS:5) 39±4 km 40.396±0.972 km |
| 8.825 h | |
|
0.0330±0.0034 0.0484±0.004 (IRAS:5) 0.05±0.01 0.051±0.011 0.059±0.002 |
|
|
B–V = 0.762 U–B = 0.358 Tholen = CBU P · C |
|
| 10.97 · 11.39±0.82 | |
1693 Hertzsprung, provisional designation 1935 LA, is a carbonaceous asteroid from the middle region of the asteroid belt, approximately 39 kilometers in diameter. It was discovered by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa on 5 May 1935.
The asteroid orbits the Sun at a distance of 2.0–3.6 AU once every 4 years and 8 months (1,708 days). Its orbit has an eccentricity of 0.27 and an inclination of 12° with respect to the ecliptic. The asteroid was already observed prior to its discovery at Crimea-Simeis in 1930. However, these precoveries were not used to extend its observation arc.
A rotational light-curve was obtained from photometric observations made with the ESO 1-metre telescope at La Silla in August 1987. The light-curve gave it a well-defined rotation period of 8.825 hours with a brightness amplitude of 0.45 in magnitude (U=3).
According to the space-based surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, the asteroid measures between 35.3 and 40.4 kilometers in diameter and its surface has an albedo in the range of 0.033 to 0.059. The Collaborative Asteroid Lightcurve Link agrees with the results obtained by IRAS, that is an albedo of 0.048 and a diameter of 38.7 kilometers. While the dark C-type asteroid is classified as a rare CBU-subtype on the Tholen taxonomic scheme, the NEOWISE mission groups the body to the rare and reddish P-type asteroids.
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