|Discovery site||Apache Point Obs.|
|Discovery date||4 November 2007
(discovery: first observation only)
|MPC designation||2007 VL305|
|Neptune trojan · L4 
centaur  · distant 
|Orbital characteristics |
|Epoch 4 September 2017 (JD 2458000.5)|
|Uncertainty parameter 4|
|Observation arc||5.19 yr (1,894 days)|
|163.71 yr (59,795 days)|
|0° 0m 21.6s / day|
|Dimensions||110 km (est. at 0.10)
2007 VL305 is an inclined Neptune trojan that shares Neptune's orbit in the L4 Lagrangian point. It was first observed on 4 November 2007, by astronomers at the Apache Point Observatory in New Mexico, United State, although images from 2005 have also been recovered. It measures approximately 160 kilometers in diameter and was the sixth Neptune trojan to be discovered. As of 2016[update], it is 34.1 AU from Neptune.
Orbit and classification
Neptune trojans can be considered resonant trans-Neptunian objects in a 1:1 mean-motion orbital resonance with Neptune. These trojans have a semi-major axis and an orbital period very similar to Neptune's (30.10 AU; 164.8 years).
2007 VL305 belongs to the leading L4 group, which orbits 60° ahead of Neptune's orbit. It orbits the Sun with a semi-major axis of 29.926 AU at a distance of 28.1–31.7 AU once every 163 years and 9 months (59,795 days). Its orbit has an eccentricity of 0.06 and an inclination of 28° with respect to the ecliptic. Its inclination is almost as high as that of 2011 HM102.
The discoverers estimate that 2007 VL305 has a mean-diameter of 160 kilometers based on a magnitude of 22.2. Based on a generic magnitude-to-diameter conversion, it measures approximately 110 kilometers in diameter using an absolute magnitude of 7.9 with an assumed albedo of 0.10.
Numbering and naming
Due to its orbital uncertainty, this minor planet has not been numbered and its official discoverers have not been determined. 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.
- "JPL Small-Body Database Browser: (2007 VL305)" (2011-01-10 last obs.). Jet Propulsion Laboratory. Retrieved 5 August 2017.
- "2007 VL305". Minor Planet Center. Retrieved 5 August 2017.
- "List Of Neptune Trojans". Minor Planet Center. 10 July 2017. Retrieved 5 August 2017.
- "Asteroid Size Estimator". CNEOS/JPL. Retrieved 5 August 2017.
- Lakdawalla, Emily (13 August 2010). "2008 LC15, the first Trojan asteroid discovered in Neptune's L5 point". The Planetary Society. Retrieved 5 August 2017.
- 2007 VL305 at JPL Horizons Change "Observer Location" to @Neptune