(432949) 2012 HH2

(432949) 2012 HH2
Discovery animation by the Astronomical Research Institute of 2012 HH2
Discovery[1]
Discovered byT. Vorobjov
Discovery siteAstronomical Research Institute (H21)
Discovery date19 April 2012
Designations
(432949) 2012 HH2
2012 HH2
TNO[2] · res 4:5[3][4]
Orbital characteristics[2]
Epoch 1 July 2021 (JD 2459396.5)
Uncertainty parameter 2
Observation arc19.16 yr (6,998 d)
Aphelion40.414 AU
Perihelion29.201 AU
34.808 AU
Eccentricity0.1611
205.36 yr (75,008 d)
40.568°
0° 0m 17.28s / day
Inclination28.585°
56.464°
100.49°
Physical characteristics
255 km (est.)[3]
0.09 (est.)[3]
6.38[1][2]

(432949) 2012 HH2 is a resonant trans-Neptunian object, approximately 255 kilometers (160 miles) in diameter, located in the outermost region of the Solar System.[3] It was discovered by Slovak astronomer Tomáš Vorobjov from images taken on the night of 19 April 2012, at the Astronomical Research Institute (H21) in Illinois, United States. This minor planet was numbered (432949) by the Minor Planet Center on 4 April 2015 (M.P.C. 93615).[5] As of 2021, it has not been named.

2012 HH2 is a resonant trans-Neptunian object in an uncommon 4:5 resonance with Neptune (DES: 5:4E).[3][4] It orbits the Sun at a distance of 29.2–40.4 AU once every 205 years and 4 months (75,008 days; semi-major axis of 34.81 AU). Its orbit has an eccentricity of 0.16 and an inclination of 29° with respect to the ecliptic.[2] It is currently 29.8 AU from the Sun.

As of 2021, no rotational lightcurve of 2012 HH2 has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.[2] Johnston's Archive estimates a mean diameter of 255 kilometers (160 miles), using a standard magnitude-to-diameter conversion with an assumed albedo of 0.09.[3] Astronomer Mike Brown gives a nearly identical estimates of 253 kilometers (160 miles) for the object's diameter with an albedo of 0.08 and an absolute magnitude of 6.3.[6]

  1. ^ a b Cite error: The named reference MPC-object was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference jpldata was invoked but never defined (see the help page).
  3. ^ a b c d e f Cite error: The named reference johnstonsarchive-TNO-list was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Buie-DES was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference MPC-Circulars-Archive was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Brown-dplist was invoked but never defined (see the help page).