15810 Arawn

15810 Arawn
A distant view of Arawn (center) from New Horizons in November 2015.[n 1]
Discovery[1]
Discovered byM. J. Irwin
A. Żytkow
Discovery siteLa Palma Obs.
Discovery date12 May 1994
Designations
(15810) Arawn
Pronunciation/ˈɑːraʊn/[2]
Named after
Arawn (Welsh mythology)[1]
1994 JR1
TNO · plutino[3][4]
Orbital characteristics[5]
Epoch 16 February 2017 (JD 2457800.5)
Uncertainty parameter 2
Observation arc21.91 yr (8,002 days)
Aphelion44.241 AU
Perihelion34.720 AU
39.480 AU
Eccentricity0.1206
248.07 yr (90,609 days)
30.638°
0° 0m 14.4s / day
Inclination3.8074°
144.69°
101.89°
Physical characteristics
Dimensions133 km (83 mi)[6]
145 km (90 mi)[7]
5.47±0.33 h[8]
0.04[8]
7.6[5]

15810 Arawn (provisional designation 1994 JR1) is a trans-Neptunian object (TNO) from the inner regions of the Kuiper belt, approximately 133 kilometres (83 mi) in diameter. It belongs to the plutinos, the most populous class of resonant TNOs. It was named after Arawn, the ruler of the underworld in Welsh mythology, and was discovered on 12 May 1994, by astronomers Michael Irwin and Anna Żytkow with the 2.5-metre Isaac Newton Telescope at Roque de los Muchachos Observatory in the Canary Islands, Spain.[1]

Arawn is unusual in that it has been observed at a much closer distance than most Kuiper belt objects, by the New Horizons spacecraft, which imaged it from a distance of 111 million km (69 million mi; 0.74 AU) in April 2016; this and its other observations have allowed its rotation period to be determined.[7][9]


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  1. ^ a b c Cite error: The named reference MPC-15810-Arawn was invoked but never defined (see the help page).
  2. ^ Boyd, Matthieu, ed. (2017). The four branches of the Mabinogi. A Broadview anthology of British literature edition. Peterborough, Ontario, Canada: Broadview Press. ISBN 978-1-55481-319-3. OCLC 990574218.
  3. ^ Cite error: The named reference Buie was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference K08O05 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference jpldata was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference tnolist was invoked but never defined (see the help page).
  7. ^ a b "Catalog Page for PIA20589". Archived from the original on 5 November 2016. Retrieved 5 November 2016.
  8. ^ a b Cite error: The named reference porter_et_al_2016 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference NASA-Post-Pluto was invoked but never defined (see the help page).