1998 WW31

1998 WW31
Hubble Space Telescope image of 1998 WW31 and its satellite in orbit
Discovery[1]
Discovered byM. W. Buie[2]
R. L. Millis[3]
Discovery siteKitt Peak Obs.
Discovery date18 November 1998
(first observed only)
Designations
1998 WW31
TNO[2][4] · cubewano (hot)[5]
distant[1] · binary[6]
Orbital characteristics[4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 4
Observation arc20.94 yr (7,647 d)
Aphelion48.526 AU
Perihelion40.429 AU
44.477 AU
Eccentricity0.09102
296.63 yr (108,345 d)
141.847°
0° 0m 11.963s / day
Inclination6.8171°
237.138°
51.218°
Known satellites1 (D: 123 km; P: 587 d)[6][7]
Physical characteristics
148 km (est. primary)[5][6]
192.1 km (cal. system)[8]
Mass(2.658±0.015)×1018 kg[9]
0.04 (est.)[10]
0.10 (assumed)[8]
blue[10]
C (assumed)[8]
V–I = 0.910±0.020[11]
6.7[4][8]
6.9[10]

1998 WW31, is a non-resonant trans-Neptunian object and binary system from the Kuiper belt located in the outermost region of the Solar System, approximately 148 kilometers (92 miles) in diameter. It was first observed on 18 November 1998, by American astronomer Marc Buie and Robert Millis at the Kitt Peak National Observatory in Arizona, United States.[2][3][1] In December 2000, a minor-planet moon, designated S/2000 (1998 WW31) 1 with a diameter of 123 kilometers (76 miles), was discovered in its orbit.[7] After Charon in 1978, it was the first of nearly 100 satellites since discovered in the outer Solar System.[3][7]

  1. ^ a b c Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference MPC-TNO-list was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Nature was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference jpldata was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference johnstonsarchive-TNO-list was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference johnstonsarchive was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference Veillet-2001 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference lcdb was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Grundy2019 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Brown-dplist was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Hainaut-2012 was invoked but never defined (see the help page).