Английская Википедия:2011 HM102
Шаблон:Use dmy dates Шаблон:Infobox planet Шаблон:Mp is the ninth Neptune trojan discovered. It was first observed on 29 April 2011, during the New Horizons KBO Search Шаблон:Obscode using the Magellan II (Clay) Telescope at Las Campanas Observatory in Chile.[1][2] It has the same orbital period as Neptune and orbits at the Шаблон:L5 Lagrangian point about 60° backwards of Neptune.[3]
Orbit and classification
Neptune trojans are resonant trans-Neptunian objects (TNO) in a 1:1 mean-motion orbital resonance with Neptune. These Trojans have a semi-major axis (a) very similar Neptune's (30.10 AU).
Шаблон:Mp orbits the Sun with a semi-major axis of 30.219 AU at a distance of 27.7–32.8 AU once every 166 years and 1 month (60,675 days). Its orbit has an eccentricity of 0.08 and an inclination of 29° with respect to the ecliptic.[4] Among the first 17 Neptune trojans discovered so far, it is the one with the highest inclination.[3]
Physical properties
Diameter and albedo
Based on a generic magnitude-to-diameter conversion, it measures approximately 100 kilometers in diameter using an absolute magnitude of 8.1 and an assumed albedo of 0.10.[5] It is an averaged-sized body among the first 17 Neptune trojans discovered so far, which measure between 60 and 200 kilometers (for an absolute magnitude of 9.3–6.6 and an assumed albedo of 0.10).[3][5]
Surface
Observations with NIRSpec showed that the spectrum of 2011 HM102 does not exhibit clear Triton-like ice tholin features. The surface is likely covered in a thin layer of water ice and CO2 ice. Due to the variable color classification of this object, it is suspected that inhomogeneities in the surface composition exist.[6]
Numbering and naming
Due to its orbital uncertainty, this minor planet has not been numbered and its official discoverers have not been determined.[4][1] 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.[7]
Exploration
In October 2012, Шаблон:Mp was the closest known object of any kind to the New Horizons spacecraft.[8] In mid- to late 2013, New Horizons passed within 1.2 AU of Шаблон:Mp, where it would be detectable with one of the onboard instruments.[2] An observation from New Horizons would measure the phase curve of Шаблон:Mp at phase angles unobtainable from Earth. The New Horizons team eventually decided that they would not target Шаблон:Mp for observations because the preparations for the Pluto approach took precedence.[9]
See also
References
External links
- A. Parker – Шаблон:Mp: A new companion for Neptune – TPS
- MPEC 2012-T05 : Шаблон:Mp
- YouTube video showing the orbital evolution
- Discoverer comments
- AstDyS-2 about Шаблон:Mp
- Шаблон:AstDys
- Шаблон:JPL small body
Шаблон:Neptunetrojans Footer Шаблон:Small Solar System bodies Шаблон:New Horizons Шаблон:Authority control
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