astro.wikisort.org - Asteroid

2013 RF₉₈ is a trans-Neptunian object.[2] It was discovered on September 12, 2013 at Cerro Tololo-DECam.

2013 RF₉₈

Discovery[1]
Discovered by	Dark Energy Survey (807)
Discovery date	12 September 2013
Designations
Designation	2013 RF98
Minor planet category	TNO
Orbital characteristics[2]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 5
Observation arc	1092 days (2.99 yr)
Aphelion	662 ± 20 AU (Q) 690 AU (barycentric)[3]
Perihelion	36.09 0.03 AU (q)
Semi-major axis	349 ± 11 AU 364 AU (barycentric)[3]
Eccentricity	0.897 ± 0.003
Orbital period (sidereal)	6527 ± 299 yr 6900 yr (barycentric solution)[3]
Mean anomaly	0.404° ± 0.004°
Inclination	29.572° ± 0.003°
Longitude of ascending node	67.596° ± 0.005°
Argument of perihelion	311.8° ± 0.6°
Physical characteristics
Dimensions	~50-120 km
Spectral type	Blue[4]
Apparent magnitude	24.4 (2016) 28.8 (@100AU)
Absolute magnitude (H)	8.7 ± 0.3[2]

It is part of the evidence for the Planet Nine hypothesis because it shares a similar argument of perihelion with other potentially shepherded TNOs.

Discovery, orbit and physical properties

2013 RF₉₈ was discovered by the Dark Energy Survey on September 12, 2013 observing with the 4 m Blanco Telescope from Cerro Tololo Inter-American Observatory.[1] Its orbit is characterized by high eccentricity (0.897), moderate inclination (29.57º) and a semi-major axis of 349 AU.[1] Upon discovery, it was classified as a trans-Neptunian object. Its orbit is relatively well determined; as of January 11, 2017 its orbital solution is based on 51 observations spanning a data-arc of 1092 days.[2] 2013 RF₉₈ has an absolute magnitude of 8.7 which gives a characteristic diameter of 50 to 120 km for an assumed albedo in the range 0.25–0.05.[5]

It came to perihelion (closest approach to the Sun) around October 2009 and was last observed in September 2016.[2] As of October 2016^[update], it is 36.6 AU from the Sun. Of the seven objects whose aligned orbits suggest the existence of Planet Nine, it is currently the closest to the Sun. It will be 18.7 AU from Uranus in 2021. It will be in the constellation of Cetus until 2022. It comes to opposition at the start of November.

2013 RF₉₈'s orbit is similar to that of 474640 Alicanto, suggesting that they may have both been thrown onto their current paths by the same body, or that they may have been the same object (single or binary) at one point.[4][6]

2013 RF₉₈'s visible spectrum is very different from that of 90377 Sedna.[4][7] The value of its spectral slope suggests that the surface of this object can have pure methane ices (like in the case of Pluto) and highly processed carbons, including some amorphous silicates.[4] Its spectral slope is similar to that of 2004 VN112.[4]

See also

• 90377 Sedna (relatively large and also distant body)
• List of Solar System objects by greatest aphelion

References

External links

• Archive of JPL #2 Epoch 2016-Jan-13 with 56-day observation arc
• MPEC 2016-U18: 2013 RF98
• New data about two distant asteroids give a clue to the possible “Planet Nine”
• Dos asteroides lejanos apoyan la hipótesis del Planeta Nueve
• 2013 RF98 at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 2013 RF98 at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] 2013 RF98

2013 RF98 ist ein Planetoid, der am 12. September 2013 am Cerro Tololo Observatory, La Serena entdeckt wurde und zur Gruppe der Kuipergürtel-Planetoiden gehört. Der Asteroid läuft auf einer hoch exzentrischen Bahn in über 6500 Jahren um die Sonne. Die Bahnexzentrizität seiner Bahn beträgt 0,90, wobei diese 29,58° gegen die Ekliptik geneigt ist[1].

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- [en] 2013 RF98

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[ru] 2013 RF98

2013 RF98 — транснептуновый объект.[2] Открыт 12 сентября 2013 года в обсерватории Серро-Тололо-DECam.

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