(523731) 2014 OK394

(523731) 2014 OK394
Discovery[1]
Discovered byPan-STARRS 1
Discovery siteHaleakalā Obs.
Discovery date8 October 2010
Designations
1995 SN55[2]
2014 OK394
3:5 resonant[3] · TNO[4] · distant[2]
Orbital characteristics[4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 2
Observation arc25.14 yr (9,181 days)
Earliest precovery date20 September 1995 (Spacewatch)[5]
Aphelion49.153 AU
Perihelion35.351 AU
42.252 AU
Eccentricity0.16333
274.65 yr
30.889°
0° 0m 12.919s / day
Inclination4.140°
128.384°
≈ 4 January 1997[6]
247.580°
Physical characteristics
160–280 km (est. 0.08–0.20)[7][8]
6.2[2][4]

(523731) 2014 OK394 (provisional designation 1995 SN55) is a trans-Neptunian object that orbits in the outer Solar System beyond the orbit of Neptune. First observed as 1995 SN55 by Spacewatch on 20 September 1995, it was a lost minor planet with an insufficiently defined orbit with only 36 days of observations.[9] On 8 October 2010, it was rediscovered by the Pan-STARRS 1 survey and later announced as 2014 OK394 in July 2016.[1] It was not until November 2020 when amateur astronomers S. Deen and K. Ly identified 2014 OK394 and 1995 SN55 as the same object.[10] This identification was confirmed and announced by the Minor Planet Center in January 2021.[11]

Once thought to be a centaur crossing the orbits of the gas giants,[9] 1995 SN55 is now known to be a trans-Neptunian object in a 3:5 orbital resonance with Neptune.[4] With an estimated diameter between 160–280 kilometers (99–170 miles), it was formerly considered one of the largest centaurs.[7][12][13]

  1. ^ a b Cite error: The named reference MPEC-2016-O154 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference johnston-tnos was invoked but never defined (see the help page).
  4. ^ a b c d Cite error: The named reference jpldata was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference MPEC-1999-L25 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference horizons was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Brown-dplist was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference sizemagnitude was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference shortarc was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference MPML was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference MPC127300 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference MPC-Cen-SDO-list was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Sokol2017 was invoked but never defined (see the help page).