2004 KV18
| Discovery[1][2] | |
|---|---|
| Discovery site | Mauna Kea Obs. |
| Discovery date | 24 May 2004 |
| Designations | |
| 2004 KV18 | |
| Neptune trojan·L5[3] TNO[1]·distant[2] | |
| Orbital characteristics[1] | |
| Epoch4 September 2017 (JD2458000.5) | |
| Uncertainty parameter4 | |
| Observation arc | 1.94 yr (708 days) |
| Aphelion | 36.058AU |
| Perihelion | 24.682 AU |
| 30.370 AU | |
| Eccentricity | 0.1873 |
| 167.37yr(61,132 days) | |
| 69.474° | |
| 0° 0m21.24s/ day | |
| Inclination | 13.557° |
| 235.54° | |
| 296.57° | |
| Physical characteristics | |
| Dimensions | 56 km(assumed)[4] 71 km(est. at0.10)[5] |
| 8.9[1] | |
2004 KV18is an eccentricNeptune trojantrailingNeptune's orbit in theouter Solar System,approximately 70 kilometers in diameter. It was first observed on 24 May 2004, by astronomers at theMauna Kea Observatorieson Hawaii, United States.[2]It was the eighthNeptune trojanidentified and the second inNeptune'sL5Lagrangian point.[3]
Orbit and classification[edit]
Neptune trojans areresonant trans-Neptunian objects(TNO) in a1:1mean-motionorbital resonancewith Neptune. These Trojans have asemi-major axisand anorbital periodvery similar to Neptune's (30.10 AU; 164.8 years).
2004 KV18belongs to the trailingL5group, which follow 60°behind Neptune's orbit. It orbits the Sun with a semi-major axis of 30.370AUat a distance of 24.7–36.1 AU once every 167 years and 4 months (61,132 days). Its orbit has a notably higheccentricityof 0.19 and aninclinationof 14°with respect to theecliptic.[1]
Orbital instability[edit]
2004 KV18is not a primordial Neptune trojan, and will leave the region on a relatively short time scale. The orbit of a Neptune trojan can only be stable when the eccentricity is less than 0.12.[6][7]: 6 Its lifetime as a trailing Neptune trojan is on theorderof 100,000 years into the future.[6]
Physical properties[edit]
Diameter and albedo[edit]
Based on a generic magnitude-to-diameter conversion, it measures approximately 71 kilometers in diameter using anabsolute magnitudeof 8.9 and an assumedalbedoof 0.10.[5]It is one of the smaller bodies 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]Other estimates, implying a higher albedo than 0.10, gave a diameter of approximately 56 kilometers.[4]
Numbering and naming[edit]
Due to itsorbital uncertainty,thisminor planethas not been numbered and its officialdiscoverershave not been determined.[1][2]If named, it will follow the naming scheme already established with385571 Otrera,which is to name these objects after figures related to theAmazons,an all-female warrior tribe that fought in theTrojan Waron the side of the Trojans against the Greek.[8]
References[edit]
- ^abcdef"JPL Small-Body Database Browser: (2004 KV18)"(2006-05-02 last obs.).Jet Propulsion Laboratory.Retrieved4 August2017.
- ^abcd"2004 KV18".Minor Planet Center.Retrieved4 August2017.
- ^abc"List Of Neptune Trojans".Minor Planet Center.10 July 2017.Retrieved4 August2017.
- ^ab"2004 KV18".The Tracking News – Observations of small Solar-System bodies. Archived fromthe originalon 31 March 2016.Retrieved4 August2017.
- ^abc"Asteroid Size Estimator".CNEOS/JPL.Retrieved4 August2017.
- ^abGuan, Pu; Zhou, Li-Yong; Li, Jian (November 2012). "Trailing (L5) Neptune Trojans: 2004 KV18 and 2008 LC18".Research in Astronomy and Astrophysics.12(11): 1549–1562.arXiv:1205.2206.Bibcode:2012RAA....12.1549G.doi:10.1088/1674-4527/12/11/009.S2CID119194002.
- ^Zhou, Li-Yong; Dvorak, Rudolf; Sun, Yi-Sui (September 2009). "The dynamics of Neptune Trojan - I. The inclined orbits".Monthly Notices of the Royal Astronomical Society.398(3): 1217–1227.arXiv:0906.5075.Bibcode:2009MNRAS.398.1217Z.doi:10.1111/j.1365-2966.2009.15203.x.S2CID14557308.
- ^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]
- MPEC 2011-O47: 2004 KV18,MPEC –Minor Planet Electronic Circular
- 2004 KV18atAstDyS-2, Asteroids—Dynamic Site
- 2004 KV18at theJPL Small-Body Database
