(470308) 2007 JH 43

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Asteroid
(470308) 2007 JH 43
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type Plutino  or
SDO ,
"Distant Object"
Major semi-axis 39,709  AU
eccentricity 0.022
Perihelion - aphelion 38.844 AU - 40.574 AU
Inclination of the orbit plane 18.1 °
Length of the ascending node 64.6 °
Argument of the periapsis 356.4 °
Time of passage of the perihelion 4th September 2137
Sidereal period 250 a 2.8 M
Mean orbital velocity 4.688 km / s
Physical Properties
Medium diameter approx. 513 km
Albedo 0.08-0.10
Absolute brightness 4.49 ± 0.05 - 4.90 mag
Spectral class C.
history
Explorer Megan E. Schwamb
Michael E. Brown
David L. Rabinowitz
Date of discovery May 10, 2007
Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . The affiliation to an asteroid family is automatically determined from the AstDyS-2 database . Please also note the note on asteroid items.

(470308) 2007 JH 43 is a large trans-Neptunian object in the Kuiper belt , which is classified as a Plutino or a scattered disc object in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2007 JH 43 was discovered on May 10, 2007 by a team of astronomers consisting of Meg Schwamb, Mike Brown and David Lincoln Rabinowitz using the 1.2 m Oschin Schmidt telescope at the Palomar Observatory of the California Institute of Technology ( California ). The discovery was announced on July 5, 2007 together with 2007 JF 43 , 2007 JJ 43 and 2007 JK 43 , the planetoid was later given the minor planet number 470308 by the IAU .

After its discovery, in 2007 JH 43 could be identified on photos taken as part of the Digitized Sky Survey program at the Siding Spring Observatory ( Australia ) up to July 16, 1983, thus extending its observation period by 24 years so to calculate its orbit more precisely. In April 2017, there were a total of 37 observations over a period of 7 years. The last observation so far was carried out in July 2015 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 15, 2019)

properties

Orbit

2007 JH 43 orbits the sun in 250.23 years on a slightly elliptical orbit between 38.84 AU and 40.57  AU from its center. The orbital eccentricity is 0.022, the orbit is 18.11 ° inclined to the ecliptic . The planetoid is currently 40.57 AU from the Sun and 40.96 AU from Earth . The next time it passes through perihelion in 2137, the last perihelion should have been in 1887.

2007 JH 43 counted as Plutino so far ; Marc Buie ( DES ), on the other hand, classifies the planetoid as SDO , which is based on a simulation over 10 million years; the Minor Planet Center classifies it as Plutino (2010) and generally as a “Distant Object” and not as an SDO. The Johnston's Archives lists it as "other TNO".

Size and rotation

A diameter of around 513 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 4.9  m . Based on this diameter, the total surface area is around 827,000 km 2 . The apparent magnitude of 2007 JH 43 is 20.93  m .

Since it can be assumed that 2007 JH 43 is in hydrostatic equilibrium due to its size and must therefore be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown assumes that 2007 JH 43 is likely a dwarf planet. Gonzalo Tancredi did not make a recommendation in 2010.

Determination of the diameter for 2007 JH 43
year Dimensions km source
2010 482.0 Tancredi
2013 529.08 LightCurve DataBase
2018 558.0 Johnston
2018 513.0 Brown
The most precise determination is marked in bold .

See also

Web links

Individual evidence

  1. ^ A b Marc W. Buie : Orbit Fit and Astrometric record for 470308 . SwRI (Space Science Department). Retrieved March 15, 2019.
  2. ↑ a b c (470308) 2007 JH43 at the IAU Minor Planet Center (English) Retrieved March 15, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ S. Benecchi, S. Sheppard : Light Curves of 32 Large Transneptunian Objects (PDF) . In: The Astronomical Journal . 145, No. 5, January 24, 2013, p. 124, 19. arxiv : 1301.5791 . bibcode : 2013AJ .... 145..124B . doi : 10.1088 / 0004-6256 / 145/5/124 .
  5. ↑ a b LCDB Data for (470308) . MinorPlanetInfo. May 2013. Retrieved March 15, 2019.
  6. ↑ MPC : MPEC 2007-N14: 2007 JF43, 2007 JH43, 2007 JJ43, 2007 JK43 . IAU . July 5, 2007. Retrieved March 15, 2019.
  7. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 15, 2019.
  8. ↑ (470308) 2007 JH43 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 15, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  9. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 15, 2019.
  10. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 15, 2019.
  11. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 15, 2019.
  12. ↑ (470308) 2007 JH43 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  13. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 15, 2019.
  14. ↑ a b Gonzalo Tancredi: Physical and dynamical characteristics of icy “dwarf planets” (plutoids) (PDF) . In: IAU (Ed.): Icy Bodies of the Solar System: Proceedings IAU Symposium No. 263, 2009 . 2010. doi : 10.1017 / S1743921310001717 . Retrieved March 15, 2019.