Astronomy:(309239) 2007 RW10
| Discovery | |
|---|---|
| Discovered by | PDSSS |
| Discovery date | 9 September 2007 |
| Designations | |
| Minor planet category | TNO[1] · Nept. co-orbital centaur · distant |
| Orbital characteristics[1] | |
| Epoch 23 March 2018 (JD 2458200.5) | |
| Uncertainty parameter 2 | |
| Observation arc | 10693 days (29.28 yr) |
| |{{{apsis}}}|helion}} | 39.28320 astronomical unit|AU (5.876683 Tm) |
| |{{{apsis}}}|helion}} | 21.06436 AU (3.151183 Tm) |
| 30.17878 AU (4.514681 Tm) | |
| Eccentricity | 0.30201 |
| Orbital period | 165.79 yr (60555.1 d) |
| Mean anomaly | 71.52911° |
| Mean motion | 0° 0m 21.402s / day |
| Inclination | 36.15744° |
| Longitude of ascending node | 187.06355° |
| 95.64947° | |
| Earth MOID | 20.2499 AU (3.02934 Tm) |
| Jupiter MOID | 17.1323 AU (2.56296 Tm) |
| TJupiter | 3.880 |
| Physical characteristics | |
| Dimensions | 247±30 km[2] |
| Geometric albedo | 0.083+0.068 −0.039[2] |
| Absolute magnitude (H) | 6.6[1] |
(309239) 2007 RW10 (provisional designation 2007 RW10) is a temporary quasi-satellite of Neptune.[3] Observed from Neptune, it would appear to revolve around it over one Neptunian year but in reality, it orbits the Sun, not Neptune.
Discovery, orbit and physical properties
(309239) 2007 RW10 was discovered by the Palomar Distant Solar System Survey on September 9, 2007,[4][5] with precovery images from 1988 (also taken at Palomar).[6] At the time of discovery, this minor body was believed to be a Neptune trojan,[7] but it is no longer listed as such.[8][9] The Jet Propulsion Laboratory classifies (309239) 2007 RW10 as trans-Neptunian object but the Minor Planet Center includes the object among centaurs. It moves in an orbit with an inclination of 36.2°, a semi-major axis of 30.18 AU, and an eccentricity of 0.3020.[1] Herschel-PACS observations indicate that it has a diameter of 247 km.[2]
Quasi-satellite dynamical state and orbital evolution
(309239) 2007 RW10 is currently following a quasi-satellite loop around Neptune.[3] It has been a quasi-satellite of Neptune for about 12,500 years and it will remain in that dynamical state for around another 12,500 years.[3] Prior to the quasi-satellite dynamical state, (309239) 2007 RW10 was an L5 trojan and it will return to this state soon after leaving its current quasi-satellite orbit. Its orbital inclination is the largest among known Neptune co-orbitals. It is also possibly the largest known object trapped in the 1:1 mean-motion resonance with any major planet.
Origin
(309239) 2007 RW10 is a dynamically hot (both, high eccentricity and inclination) object that is unlikely to be a primordial Neptune co-orbital. It probably originated well beyond Neptune and was later temporarily captured in the 1:1 resonance with Neptune.[3][10]
See also
- 2005 TN74, which was also suspected of being a Neptune trojan at the time of discovery
References
- ↑ 1.0 1.1 1.2 1.3 "JPL Small-Body Database Browser: 2007 RW10". https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007RW10. Retrieved 2018-08-25.
- ↑ 2.0 2.1 2.2 Santos-Sanz, P., Lellouch, E., Fornasier, S., Kiss, C., Pal, A., Müller, T. G., Vilenius, E., Stansberry, J., Mommert, M., Delsanti, A., Mueller, M., Peixinho, N., Henry, F., Ortiz, J. L., Thirouin, A., Protopapa, S., Duffard, R., Szalai, N., Lim, T., Ejeta, C., Hartogh, P., Harris, A. W., & Rengel, M. (2012). "TNOs are Cool": A Survey of the Transneptunian Region IV - Size/albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACS
- ↑ 3.0 3.1 3.2 3.3 de la Fuente Marcos, C.; de la Fuente Marcos, R. (2012). "(309239) 2007 RW10: a large temporary quasi-satellite of Neptune". Astronomy and Astrophysics Letters 545: L9. doi:10.1051/0004-6361/201219931. Bibcode: 2012A&A...545L...9D.
- ↑ "Discovery MPEC". https://www.minorplanetcenter.net/mpec/K07/K07X06.html. Retrieved 2012-07-26.
- ↑ Schwamb, Megan E. (September 2010). "Properties of the Distant Kuiper Belt: Results from the Palomar Distant Solar System Survey". The Astrophysical Journal 720 (2): 1691–1707. doi:10.1088/0004-637X/720/2/1691. Bibcode: 2010ApJ...720.1691S.
- ↑ "(309239) = 2007 RW10". https://minorplanetcenter.net/db_search/show_object?utf8=%E2%9C%93&object_id=309239.
- ↑ "Distant EKOs, 55". http://www.boulder.swri.edu/ekonews/issues/past/n055/html/index.html. Retrieved 2012-07-24.
- ↑ "Distant EKOs 56". http://www.boulder.swri.edu/ekonews/issues/past/n056/html/index.html. Retrieved 2012-07-24.
- ↑ Minor Planet Center List Of Neptune Trojans (2007-12-01)
- ↑ Horner, J.; Lykawka, P. S.; Bannister, M. T.; Francis, P. (2012). "2008 LC18: a potentially unstable Neptune Trojan". Monthly Notices of the Royal Astronomical Society 422 (3): 2145–2151. doi:10.1111/j.1365-2966.2012.20757.x. Bibcode: 2012MNRAS.422.2145H.
External links
- MPEC 2007-X06, Minor Planet Electronic Circular (1 December 2007)
- 2007 RW10 Precovery Images
- (309239) 2007 RW10 at the JPL Small-Body Database
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