![]() Discovery animation by the
Astronomical Research Institute of 2012 HH2 | |
Discovery [1] | |
---|---|
Discovered by | T. Vorobjov |
Discovery site | Astronomical Research Institute ( H21) |
Discovery date | 19 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 arc | 19.16 yr (6,998 d) |
Aphelion | 40.414 AU |
Perihelion | 29.201 AU |
34.808 AU | |
Eccentricity | 0.1611 |
205.36 yr (75,008 d) | |
40.568 ° | |
0° 0m 17.28s / day | |
Inclination | 28.585° |
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 [update], 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 [update], 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]
![]() Discovery animation by the
Astronomical Research Institute of 2012 HH2 | |
Discovery [1] | |
---|---|
Discovered by | T. Vorobjov |
Discovery site | Astronomical Research Institute ( H21) |
Discovery date | 19 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 arc | 19.16 yr (6,998 d) |
Aphelion | 40.414 AU |
Perihelion | 29.201 AU |
34.808 AU | |
Eccentricity | 0.1611 |
205.36 yr (75,008 d) | |
40.568 ° | |
0° 0m 17.28s / day | |
Inclination | 28.585° |
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 [update], 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 [update], 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]