(385695) 2005 TO74

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(385695) 2005 TO74
Discovery [1][2][3]
Discovered by C. Trujillo
S. S. Sheppard
Discovery site Las Campanas Obs.
Discovery date 8 October 2005
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)
0° 0m 21.6s / day
Inclination 5.2596°
Physical characteristics
Dimensions 93 km (est. at 0.10)[5]
100 km[6]

(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]


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[edit]


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[edit]

Due to its orbital uncertainty, this minor planet has not been numbered and its official discoverers have not been determined.[1][2] If named, it 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.[citation needed]


  1. ^ a b c d e "JPL Small-Body Database Browser: 385695 (2005 TO74)" (2013-10-06 last obs.). Jet Propulsion Laboratory. Retrieved 4 August 2017. 
  2. ^ a b c d "385695 (2005 TO74)". Minor Planet Center. Retrieved 4 August 2017. 
  3. ^ a b c MPEC 2005-U97 : 2005 TN74, 2005 TO74
  4. ^ a b "List Of Neptune Trojans". Minor Planet Center. 10 July 2017. Retrieved 4 August 2017. 
  5. ^ a b "Asteroid Size Estimator". CNEOS/JPL. Retrieved 4 August 2017. 
  6. ^ a b c 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:1007.5362Freely accessible. Bibcode:2011MNRAS.410.1849Z. doi:10.1111/j.1365-2966.2010.17566.x. 

External links[edit]