385571 Otrera
| Discovery [1][2] | |
|---|---|
| Discovered by | S. S. Sheppard C. Trujillo |
| Discovery site | Las Campanas Obs. |
| Discovery date | 16 October 2004 |
| Designations | |
| (385571) Otrera | |
Named after | Otrera(Greek mythology)[2] |
| 2004 UP10 | |
| Neptune trojan·L4 [3] centaur [1]·distant [2] | |
| Orbital characteristics [1] | |
| Epoch4 September 2017 (JD2458000.5) | |
| Uncertainty parameter4 | |
| Observation arc | 8.97 yr (3,277 days) |
| Aphelion | 30.727AU |
| Perihelion | 29.327 AU |
| 30.027 AU | |
| Eccentricity | 0.0233 |
| 164.54yr(60,099 days) | |
| 355.52° | |
| 0° 0m21.6s/ day | |
| Inclination | 1.4334° |
| 34.761° | |
| 3.5334° | |
| Physical characteristics | |
| Dimensions | 74 km(est. at0.10)[4] 100 km[5] |
| 23.3[5] | |
| 8.8[1] | |
385571 Otrera,provisional designation2004 UP10,is aNeptune trojanleadingNeptune's orbit in theouter Solar System.It was discovered by American astronomersScott SheppardandChad TrujilloatLas Campanas Observatoryon 16 October 2004.[2]It measures approximately 100 kilometers in diameter and was the second such body to be discovered after2001 QR322.[3]
Orbit and classification
[edit]Neptune trojans areresonant trans-Neptunian objectsin a1:1mean-motionorbital resonancewith Neptune. These Trojans have asemi-major axisand anorbital periodvery similar to Neptune's (30.10 AU; 164.8 years).
Otrerabelongs to theL4group, which leads 60°ahead Neptune's orbit. It orbits the Sun with asemi-major axisof 30.027AUat a distance of 29.3–30.7 AU once every 164 years and 6 months (60,099 days). Its orbit has aneccentricityof 0.02 and aninclinationof 1°with respect to theecliptic.[1]
Physical characteristics
[edit]The discoverers estimate that the body has a mean-diameter of 100 kilometers based on amagnitudeof 23.3.[5]Based on a generic magnitude-to-diameter conversion, it measures approximately 74 kilometers in diameter using anabsolute magnitudeof 8.8 and an assumedalbedoof 0.10.[4]
Naming
[edit]Thisminor planetwas the first Neptune trojan to be named in November 2015. It was named afterOtrera,the firstAmazonianqueen inGreek mythology.[2]The naming scheme is to name these objects after figures related to theAmazons,which was an all-female warrior tribe that fought in theTrojan Waron the side of the Trojans against the Greeks.[6]
References
[edit]- ^abcde"JPL Small-Body Database Browser: 385571 Otrera (2004 UP10)"(2013-10-06 last obs.).Jet Propulsion Laboratory.Retrieved4 August2017.
- ^abcde"385571 Otrera (2004 UP10)".Minor Planet Center.Retrieved4 August2017.
- ^ab"List Of Neptune Trojans".Minor Planet Center.10 July 2017.Retrieved4 August2017.
- ^ab"Asteroid Size Estimator".CNEOS/JPL.Retrieved2 August2017.
- ^abcLakdawalla, Emily (13 August 2010)."2008 LC15, the first Trojan asteroid discovered in Neptune's L5 point".The Planetary Society.Retrieved4 August2017.
- ^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.Retrieved25 August2018.
External links
[edit]- Scott Sheppard and the hunt for Neptune TrojansonYouTube(time 1:40 min.)
- 385571 OtreraatAstDyS-2, Asteroids—Dynamic Site
- 385571 Otreraat theJPL Small-Body Database
