2011 UN 63 is a Trojan asteroid of Mars , orbits near the Lagrange point L 5 (60 ° behind Mars in its orbit) [2] [3] .
| 2011 UN 63 | |
|---|---|
| Asteroid | |
| Minor Planet Category | Mars Trojan asteroid |
| Opening | |
| Discoverer | Mount Lemmon Review |
| opening date | October 21, 2011 |
| Orbital characteristics [1] | |
| Age : January 13, 2016 ( JD 2457400.5) | |
| Perihelion | 1.4253677 a. e. (210 million km ) |
| Aphelion | 1.6222522 a. e. (240 million km ) |
| Semimajor axis ( a ) | 1.5238099 a. e. (230 million km ) |
| Orbital eccentricity ( e ) | 0,0646 [1] |
| Sidereal circulation period | 1.88 years (687.06 days) |
| The average anomaly ( M o ) | 9.9539 ° [1] |
| Inclination ( i ) | 20.363 ° [1] |
| Longitude node ( Ω ) | 223.546 ° [1] |
| Pericenter Argument ( ω ) | 165.42 ° 28918 |
| physical characteristics | |
| Dimensions | 560 m |
| Albedo | 0.5-0.05 (assumption) |
| Absolute magnitude | 19.7 [1] |
Content
- 1 Detection, orbit, physical properties
- 2 Mars Trojan asteroid, orbit evolution
- 3 Nature of the object
- 4 See also
- 5 notes
- 6 Literature
- 7 References
Detection, orbit, physical properties
The 2011 UN 63 was first observed on September 27, 2009 as part of the Mount Lemmon Survey and received the preliminary designation 2009 SA 170 . The object was lost and then rediscovered on October 21, 2011 also in the Mount Lemmon survey [4] . 2011 UN 63 is in orbit with a low eccentricity (0.064) with a semi-major axis of 1.52 a.e. [4] . The orbit has an average slope value (20.4 °) [4] . After the discovery, the asteroid was assigned by the Center of Minor Planets to the class of asteroids crossing the orbit of Mars . The orbit of the object is well defined, since (as of June 2019) it is based on data from 76 observations with a total observation arc of 1587 days [1] . The asteroid has an absolute magnitude of 19.7, which corresponds to a diameter of about 560 m. [1]
Mars Trojan asteroid, orbit evolution
Recent numerical experiments [2] [3] showed that the asteroid is in a stable orbit around point L 5 and has a libration period of 1350 years at an amplitude of 14 °. These values, as well as the evolution of the orbit on small time scales, are similar to the parameters for the asteroids (5261) Eureka and 2011 SC 191 .
Object nature
Numerical integration over long periods of time has shown that at intervals of the order of billions of years, the orbit is stable. As in the case of Eureka, calculations in both directions of time (4.5 billion years into the past and into the future) showed that 2011 UN 63 may be the original object, possibly the remainder of the planetesimals population formed in the region of the terrestrial planets in the early stages of evolution Solar system. [2]
See also
- (5261) Eureka
- 1999 UJ 7
- 1998 VF 31
- 2001 DH 47
- 2007 NS 2
- 2011 SC 191
- 2011 SL 25
Notes
- ↑ 1 2 3 4 5 6 7 8 JPL Small-Body Database Browser: (2011 UN63) unspecified . Jet Propulsion Laboratory . Date of treatment June 25, 2019.
- ↑ 1 2 3 de la Fuente Marcos, C .; de la Fuente Marcos, R. Three new stable L5 Mars Trojans (Eng.) // Monthly Notices of the Royal Astronomical Society: Letters . - 2013 .-- April ( vol. 432 , no. 1 ). - P. L31 — L35 . - DOI : 10.1093 / mnrasl / slt028 . - . - arXiv : 1303.0124 .
- ↑ 1 2 Christou, AA Orbital clustering of Martian Trojans: An asteroid family in the inner solar system? (English) // Icarus : journal. - Elsevier , 2013 .-- Vol. 224 , no. 1 . - P. 144-153 . - DOI : 10.1016 / j.icarus.2013.02.01.013 . - . - arXiv : 1303.0420 .
- ↑ 1 2 3 MPC data on 2011 UN63
Literature
- 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.
- Orbital clustering of Martian Trojans: An asteroid family in the inner solar system? Christou, AA 2013, Icarus , Vol. 224, Issue 1, pp. 144-153.
Links
- 2011 UN 63 data at MPC
- 2011 UN63 at AstDyS-2, Asteroids — Dynamic Site
- Jpg