(385695) 2005 TO74

(385695) 2005 TO74
Discovery [1][2][3]
Discovered by C. Trujillo
S. S. Sheppard
Discovery site Las Campanas Obs.
Discovery date 8 October 2005
Designations
MPC designation (385695) 2005 TO74
2005 TO74
Neptune trojan · L4 [4]
centaur [1] · distant [2]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 4
Observation arc 10.02 yr (3,661 days)
Aphelion 31.585 AU
Perihelion 28.458 AU
30.021 AU
Eccentricity 0.0521
164.50 yr (60,082 days)
281.30°
0° 0m 21.6s / day
Inclination 5.2596°
169.46°
308.44°
Physical characteristics
Dimensions 93 km (est. at 0.10)[5]
100 km[6]
23.2[6]
8.3[1]

    (385695) 2005 TO74 is a minor planet and the fourth Neptune trojan discovered.[4] It was first observed with an apparent magnitude of 23.2 on 8 October 2005, by American astronomers Scott Sheppard and Chad Trujillo at Las Campanas Observatory in Chile.[2][3]

    Orbit

    It orbits near Neptune's L4 Lagrangian point about 60° ahead of Neptune and thus has the about same orbital period as Neptune. The Neptune-resonance should keep it more than 19 AU from Neptune for 14,000 years.[3] As of 2016, it is 25.5 AU from Neptune. 2005 TO74 is located close to the boundary separating stable orbits from unstable ones, and it may be influenced by a secular resonance.[7]

    Physical characteristics

    Diameter

    The discoverers estimate that 2005 TO74 has a mean-diameter of 100 kilometers based on a magnitude of 23.2.[6] Based on a generic magnitude-to-diameter conversion, it measures approximately 93 kilometers in diameter using an absolute magnitude of 8.3 with an assumed albedo of 0.10.[5]

    Numbering and naming

    When named, (385695) 2005 TO74 will follow the naming scheme already established with 385571 Otrera, which is to name these objects after figures related to the Amazons, an all-female warrior tribe that fought in the Trojan War on the side of the Trojans against the Greek.[8]

    References

    1. 1 2 3 4 "JPL Small-Body Database Browser: 385695 (2005 TO74)" (2013-10-06 last obs.). Jet Propulsion Laboratory. Retrieved 4 August 2017.
    2. 1 2 3 "385695 (2005 TO74)". Minor Planet Center. Retrieved 4 August 2017.
    3. 1 2 3 MPEC 2005-U97 : 2005 TN74, 2005 TO74
    4. 1 2 "List Of Neptune Trojans". Minor Planet Center. 10 July 2017. Retrieved 4 August 2017.
    5. 1 2 "Asteroid Size Estimator". CNEOS/JPL. Retrieved 4 August 2017.
    6. 1 2 3 Lakdawalla, Emily (13 August 2010). "2008 LC15, the first Trojan asteroid discovered in Neptune's L5 point". The Planetary Society. Retrieved 4 August 2017.
    7. ↑ Zhou, Li-Yong; Dvorak, Rudolf; Sun, Yi-Sui (2011). "The dynamics of Neptune Trojans – II. Eccentric orbits and observed objects". Monthly Notices of the Royal Astronomical Society. 430 (3): 1849–1860. arXiv:1007.5362. Bibcode:2011MNRAS.410.1849Z. doi:10.1111/j.1365-2966.2010.17566.x.
    8. ↑ Ticha, J.; et al. (10 April 2018). "DIVISION F / Working Group for Small Body Nomenclature Working Group for Small Body Nomenclature. THE TRIENNIAL REPORT (2015 Sept 1 - 2018 Feb 15)" (PDF). IAU. Retrieved 25 August 2018.
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