20936 Nemrut Dagi
| Discovery | |
|---|---|
| Discovered by |
PLS C. J. van Houten I. van Houten Tom Gehrels |
| Discovery site | Palomar Obs. |
| Discovery date | 13 May 1971 |
| Designations | |
| MPC designation | (20936) Nemrut Dagi |
|
Named after
|
Nemrut Dağı (volcano) |
|
4835 T-1 · 1953 CP 1992 SR |
|
|
main-belt (inner) Hungaria Mars-crosser |
|
| Orbital characteristics | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 44.85 yr (16,382 days) |
| Aphelion | 2.0419 AU |
| Perihelion | 1.6666 AU |
| 1.8543 AU | |
| Eccentricity | 0.1012 |
| 2.53 yr (922 days) | |
| 109.71° | |
| Inclination | 18.600° |
| 26.664° | |
| 324.22° | |
| Earth MOID | 0.6839 AU |
| Physical characteristics | |
| Dimensions |
3.57±0.19 km 5.16 km (calculated) |
|
3.2754±0.0005 h 3.321±0.002 h 5.697±0.002 h 3.233±0.002 3.293±0.001 h |
|
|
0.460±0.078 0.20 (assumed) |
|
| S | |
| 13.8 13.70 |
|
20936 Nemrut Dagi, provisional designation 4835 T-1, is a stony asteroid from the innermost regions of the asteroid belt, roughly 4 to 5 kilometers in diameter. It was discovered on 13 May 1971, by Dutch astronomer couple Ingrid and Cornelis van Houten at Leiden, on photographic plates taken by Dutch–American astronomer Tom Gehrels at the U.S. Palomar Observatory in California.
The asteroid orbits the Sun at a distance of 1.7–2.0 AU once every 2 years and 6 months (922 days). Its orbit has an eccentricity of 0.10 and an inclination of 19° with respect to the plane of the ecliptic. The Collaborative Asteroid Lightcurve Link (CALL) also classifies the S-type asteroid as a Mars-crosser, due to a perihelion of less than 1.668 AU, while German astronomer Joachim Schubart, who suggested the body's name, described it as a member of the Hungaria family, as its semi-major axis lies in between 1.78 and 2.0 AU. Although the two different classifications are not mutually exclusive, other orbital parameters, such as a period of 2.5 years, an eccentricity of less than 0.16, and an inclination between 16° and 34°, are typical for Hungaria asteroids.
In December 2015, a photometric light-curve analysis by astronomer Brian Warner the U.S. Palmer Divide Observatory (PDO), Colorado, rendered the first well-defined rotation period of 3.2754±0.0005 hours with a brightness amplitude of 0.08 in magnitude (U=3). Previous observations at the PDO and by astronomer Brian A. Skiff rendered similar periods between 3.23 and 3.29 hours with an amplitude in the range of 0.05 to 0.15 (U=2).
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