(15810) Arawn
Asteroid (15810) Arawn |
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Arawn captured by the New Horizons spacecraft in November 2015 | |
Properties of the orbit ( animation ) | |
Orbit type | Plutino |
Major semi-axis | 39.6 AU |
eccentricity | 0.122 |
Perihelion - aphelion | 34.75 AU - 44.45 AU |
Inclination of the orbit plane | 3.8 ° |
Length of the ascending node | 144.7 ° |
Sidereal period | 249 a |
Mean orbital velocity | 4.72 km / s |
Physical Properties | |
Medium diameter | 251 km |
Rotation period | 5.47 h |
Absolute brightness | 7.7 likes |
history | |
Explorer |
Mike Irwin , Anna Żytkow |
Date of discovery | May 12, 1994 |
Another name | 1994 JR 1 |
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items. |
(15810) Arawn (provisional designation 1994 JR 1 ) is a Trans-Neptunian object . It was discovered on May 12, 1994 by Mike Irwin and Anna Żytkow with the Isaac Newton telescope at the Roque de los Muchachos observatory on La Palma . It was classified as a Plutino in 2: 3 resonance to Neptune. The object was named on January 2, 2017 after Arawn , a figure from Celtic mythology.
On November 2, 2015, the New Horizons space probe took several images every hour with the LORRI camera. At the time of the acquisition, the object was approximately 5.3 billion km from the Sun, but only 280 million km from New Horizons. Another observation was made on April 7–8. April 2016 from a distance of 111 million km. Simultaneous observation with Hubble enabled the orbit of the object to be determined much more precisely to less than 1000 km using parallax . The assessment as a possible quasi-satellite to Pluto was thus refuted. The observation also revealed a period of rotation of 5.47 hours and that the surface must be quite uneven.
See also
Individual evidence
- ^ A b Mike Irwin, Scott Tremaine, Anna Żytkow: A Search for slow-moving objects and the luminosity function of the Kuiper Belt In: The Astronomical Journal. No. 110 (6), 1995, pp. 3082-3092.
- ↑ (15810) Arawn in the Small-Body Database of the Jet Propulsion Laboratory (English). Accessed May 31, 2018.
- ↑ (15810) Arawn at the IAU Minor Planet Center (English). Accessed May 31, 2018.
- ^ A Distant Close-up: New Horizons' Camera Captures a Wandering Kuiper Belt Object.
- ^ New Horizons: Getting to Know a KBO - Pluto New Horizons. Retrieved January 6, 2019 (American English).