Summary
(385250) 2001 DH47, provisional designation 2001 DH47, is a sub-kilometer asteroid and Mars trojan orbiting 60° behind the orbit of Mars near the L5 point.[2][3]
| Discovery | |
|---|---|
| Discovered by | Spacewatch |
| Discovery date | 20 February 2001 |
| Designations | |
| (385250) 2001 DH47 | |
| 2001 DH47 | |
Martian L5  | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 5521 days (15.12 yr) |
| Aphelion | 1.5767436 AU (235.87749 Gm) |
| Perihelion | 1.4708966 AU (220.04300 Gm) |
| 1.5238201 AU (227.96024 Gm) | |
| Eccentricity | 0.0347308 |
| 1.88 yr (687.07 d) | |
| 322.37107° | |
| 0° 31m 26.279s / day | |
| Inclination | 24.40220° |
| 147.42225° | |
| 17.54935° | |
| Physical characteristics | |
Mean diameter | 0.562 km |
| 3.97 h[1] | |
| 0.5–0.05 (assumed) | |
| 18.9[1] | |
Discovery, orbit and physical properties edit
2001 DH47 was discovered on 1 February 2001 by the Spacewatch program, observing from Steward Observatory, Kitt Peak[4] and classified as Mars-crosser by the Minor Planet Center. Its orbit is characterized by low eccentricity (0.035), moderate inclination (24.4º) and a semi-major axis of 1.52 AU.[4] Its orbit is well determined as it is currently (March 2013) based on 45 observations with a data-arc span of 3,148 days.[1] It has an absolute magnitude of 19.7 which gives a characteristic diameter of 562 m.[1]
Mars trojan and orbital evolution edit
It was identified as Mars trojan by H. Scholl, F. Marzari and P. Tricarico in 2005 and its dynamical half-lifetime was found to be of the order of the age of the Solar System.[2] Recent calculations[3] confirm that it is indeed a stable L5 Mars trojan with a libration period of 1365 yr and an amplitude of 11°. These values as well as its short-term orbital evolution are very similar to those of 5261 Eureka.
Origin edit
Long-term numerical integrations show that its orbit is very stable on Gyr time-scales (1 Gyr = 1 billion years).[2][3] As in the case of Eureka, calculations in both directions of time (4.5 Gyr into the past and 4.5 Gyr into the future) indicate that 2001 DH47 may be a primordial object, perhaps a survivor of the planetesimal population that formed in the terrestrial planets region early in the history of the Solar System.[3]
See also edit
References edit
- ^ a b c d e "385250 (2001 DH47)". JPL Small-Body Database. NASA/Jet Propulsion Laboratory. Retrieved 12 April 2016.
- ^ a b c Dynamics of Mars Trojans
- ^ a b c d de la Fuente Marcos, C.; de la Fuente Marcos, R. (April 2013). "Three new stable L5 Mars Trojans". Monthly Notices of the Royal Astronomical Society: Letters. 432 (1): L31–L35. arXiv:1303.0124. Bibcode:2013MNRAS.432L..31D. doi:10.1093/mnrasl/slt028.
- ^ a b MPC data on 2001 DH47
Further reading edit
- 2001 DH47 Ivashchenko, Y., Ostafijchuk, P., Spahr, T. B. 2007, Minor Planet Electronic Circular, 2007-P09.
- Dynamics of Mars Trojans Scholl, H., Marzari, F., Tricarico, P. 2005, Icarus, Volume 175, Issue 2, pp. 397–408.
- Three new stable L5 Mars Trojans de la Fuente Marcos, C., de la Fuente Marcos, R. 2013, Monthly Notices of the Royal Astronomical Society: Letters, Vol. 432, Issue 1, pp. 31–35.
External links edit
- 2001 DH47 data at MPC
- (385250) 2001 DH47 at AstDyS-2, Asteroids—Dynamic Site
- Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
- (385250) 2001 DH47 at the JPL Small-Body Database
