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(613490) 2006 RJ103

Neptune trojan

Field	Value
minorplanet	yes
name
background	#C7FF8F
discovery_ref
discovered	12 September 2006
discoverer	Sloan Digital Sky Srvy.
discovery_site	Apache Point Obs.
mpc_name
mp_category	{{Hlist
<ref name	"MPC-NeptuneTrojans" /
centaur<ref name	"jpldata" /
distant<ref name	"MPC-2006RJ103" /
orbit_ref
epoch	4 September 2017 (JD 2458000.5)
uncertainty	3
observation_arc	14.15 yr (5,169 days)
aphelion	30.862 AU
perihelion	28.988 AU
semimajor	29.925 AU
eccentricity	0.0313
period	163.70 yr (59,793 days)
mean_anomaly	251.55°
mean_motion	/ day
inclination	8.1641°
asc_node	120.86°
arg_peri	33.563°
dimensions	{{Ubl
130 km <ref name	"h" /
180 km<ref name	"Planetary-Society" /
magnitude	22.0
abs_magnitude	7.5

| Neptune trojan | | centaur | distant | 130 km (est. at 0.10) | 180 km **** is a Neptune trojan, first observed by the Sloan Digital Sky Survey Collaboration at Apache Point Observatory, New Mexico, on 12 September 2006. It was the fifth and largest such body discovered, approximately 180 kilometers in diameter. , it is 30.3 AU from Neptune.

Orbit and classification

Neptune trojans are 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).

belongs to the leading group, which follow 60° ahead Neptune's orbit. It orbits the Sun with a semi-major axis 29.925 AU of at a distance of 29.0–30.9 AU once every 163 years and 8 months (59,793 days). Its orbit has an eccentricity of 0.03 and an inclination of 8° with respect to the ecliptic.

Physical characteristics

The discoverers estimate that has a mean-diameter of 180 kilometers based on a magnitude of 22.0. Based on a generic magnitude-to-diameter conversion, it measures approximately 130 kilometers in diameter using an absolute magnitude of 7.5 with an assumed albedo of 0.10.

Ground-based and James Webb Space Telescope spectroscopy have shown that lacks clear signatures of water ice. Instead, its surface is covered by hydrated minerals that have 0.7 and 3.0 micron absorption features.

Numbering and naming

This minor planet was by the Minor Planet Center on 28 March 2022 (M.P.C. 139905). 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.

References

|access-date= 4 August 2017}}

References

(2023-11-01). "Spectroscopic Links among Giant Planet Irregular Satellites and Trojans". The Planetary Science Journal.
(2025-04-01). "Saturnian Irregular Satellites as a Probe of Kuiper Belt Surface Evolution". The Planetary Science Journal.
(2023). "First Near-IR Spectroscopic Survey of Neptune Trojans with JWST: Distinct Surface Compositions of Red vs Ultra-Red Neptune Trojans".
(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)". IAU.

Info: Wikipedia Source

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neptune-trojans astronomical-objects-discovered-in-2006

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