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(311999) 2007 NS₂ is an asteroid and Mars trojan orbiting near the L₅ point of Mars.

(311999) 2007 NS₂

Discovery[1]
Discovery site	Observatorio Astronómico de La Sagra
Discovery date	14 July 2007
Designations
Minor planet category	Martian L5
Orbital characteristics[2][3]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc	6296 days (17.24 yr)
Aphelion	1.6061055 AU (240.26996 Gm)
Perihelion	1.4414495 AU (215.63778 Gm)
Semi-major axis	1.5237775 AU (227.95387 Gm)
Eccentricity	0.0540289
Orbital period (sidereal)	1.88 yr (687.04 d)
Mean anomaly	29.476921°
Mean motion	0.5239885°/day
Inclination	18.62037°
Longitude of ascending node	282.49476°
Argument of perihelion	176.94930°
Physical characteristics
Dimensions	800–1600 m
Absolute magnitude (H)	18.1

Discovery, orbit and physical properties

(311999) 2007 NS₂ was discovered on 14 July 2007, by the Observatorio Astronómico de La Sagra.[4][5][6][7][8] Its orbit is characterized by low eccentricity (0.054), moderate inclination (18.6°) and a semi-major axis of 1.52 AU.[8] Upon discovery, it was classified as Mars-crosser by the Minor Planet Center. Its orbit is well determined as it is currently (March 2013) based on 87 observations with a data-arc span of 4,800 days.[2] 2007 NS₂ has an absolute magnitude of 17.8, which gives a characteristic diameter of 870 m.[2]

Mars trojan and orbital evolution

Jean Meeus suspected that (311999) 2007 NS₂ was a Mars Trojan, and this was confirmed by Reiner Stoss's analysis of two sets of observations dating from 1998 on the MPC database.[9] It was confirmed to be a Mars Trojan numerically in 2012.[10] Recent calculations confirm that it is a stable L₅ Mars Trojan asteroid with a libration period of 1310 years and an amplitude of 14°.[11][12] These values as well as its short-term orbital evolution are similar to those of 5261 Eureka. Out of all known Mars Trojans, it currently has the smallest relative (to Mars) semimajor axis, 0.000059 AU.[11]

Origin

Long-term numerical integrations show that its orbit is very stable on Gyr time-scales (1 Gyr = 1 billion years). 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 (311999) 2007 NS₂ 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.[11]

See also

• 5261 Eureka (1990 MB)
• (101429) 1998 VF31
• (121514) 1999 UJ7
• (385250) 2001 DH47
• 2009 SE
• 2011 SC191
• 2011 SL25
• 2011 SP189
• 2011 UB256
• 2011 UN63
• 2016 CP31
• 2018 EC4
• 2018 FC4
• 2020 VT1

References

Further reading

• Rodriguez, J.; et al. (2007). "2007 NS2". Minor Planet Electronic Circular: 2007–0303. Bibcode:2007MPEC....O...03R.
• Skiff, B. A.; et al. (2007). "2007 NS2". Minor Planet Electronic Circular: 2007-O09. Bibcode:2007MPEC....O...09S.
• Schwarz, R.; Dvorak, R. (2007). "Trojan capture by terrestrial planets". Celestial Mechanics and Dynamical Astronomy. 113 (1): 23. arXiv:1611.07413. Bibcode:2012CeMDA.113...23S. doi:10.1007/s10569-012-9404-4.
• de la Fuente Marcos, Carlos; de la Fuente Marcos, Raúl (2013). "Three new stable L5 Mars Trojans". Monthly Notices of the Royal Astronomical Society Letters. 432 (1): L31. arXiv:1303.0124. Bibcode:2013MNRAS.432L..31D. doi:10.1093/mnrasl/slt028.
• Christou, A. A. (2007). "Orbital clustering of martian Trojans: An asteroid family in the inner Solar System?". Icarus. 224 (1): 144. arXiv:1303.0420. Bibcode:2013Icar..224..144C. doi:10.1016/j.icarus.2013.02.013.

External links

• 2007 NS₂ data at MPC.
• (311999) 2007 NS2 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• (311999) 2007 NS2 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (311999) 2007 NS2

(311999) 2007 NS2 ist ein Mars-Trojaner (L5), der am 14. Juli 2007 von Forschern des Observatorio Astronómico de La Sagra in den Bergen Andalusiens entdeckt wurde.

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- [en] (311999) 2007 NS2

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[ru] (311999) 2007 NS2

(311999) 2007 NS2 — это небольшой троянский астероид Марса, расположенный в марсианской точке Лагранжа L5, движущийся по орбите в 60° позади планеты. Он был открыт 14 июля 2007 года астрономами обсерватории Ла-Сагра. Этот астероид пока не имеет собственного имени, и лишь недавно получил порядковый номер в каталогах.

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