(523617) 2007 hp 45

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Asteroid
(523617) 2007 hp 45
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type RKBO 1: 2 ,
"Distant Object"
Major semi-axis 47,599  AU
eccentricity 0.198
Perihelion - aphelion 38.168 AU - 57.029 AU
Inclination of the orbit plane 19.5 °
Length of the ascending node 130.9 °
Argument of the periapsis 188.7 °
Time of passage of the perihelion July 10, 1988
Sidereal period 328 a 4.8 M
Mean orbital velocity 4.282 km / s
Physical Properties
Medium diameter approx. 358 km
Albedo 0.08-0.09
Absolute brightness 5.6 - 5.7 mag
history
Explorer Palomar observatory
Date of discovery August 12, 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.

(523617) 2007 PS 45 is a large trans-Neptunian object in the Kuiper belt , which is classified as a resonant KBO ( Twotino ) in terms of railway dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2007 PS 45 was discovered on August 12, 2007 by a team of astronomers at the Palomar Observatory of the California Institute of Technology (CalTech). The discovery was made by 7 October 2010 Dave Rabinowitz , Meg Schwamb and Suzanne Tourtellotte from Silla Observatory La ( Chile ) of the European Southern Observatory (ESO) announced the asteroid was on 25 September 2018 the IAU , the Minor Planet -number 523617 .

The observation arc of the asteroid begins with the official discovery observation on August 12, 2007. Since then, the asteroid has been observed by various earth-based telescopes. In October 2018, a total of 107 observations were made over a period of 11 years. The last observation so far was carried out in December 2017 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 18, 2019)

properties

Orbit

2007 PS 45 orbits the sun in 328.40 years on a slightly elliptical orbit between 38.17  AU and 57.03 AU from its center. The orbital eccentricity is 0.198, the orbit is 19.52 ° inclined to the ecliptic . The planetoid is currently 40.49 AU from the sun. The last time he passed through perihelion was in 1988, the next perihelion should therefore take place in 2316.

Marc Buie ( DES ) classifies the planetoid as Twotino (RKBO 1: 2), while the Minor Planet Center does not have a specific classification; the latter classifies it as a non-SDO and generally as a “distant object” .

size

A diameter of 358 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.7  m . Based on this diameter, the total surface area is around 403,000 km 2 . The apparent magnitude of 2007 PS 45 is 21.81  m .

Since it is conceivable that 2007 PS 45 is in hydrostatic equilibrium due to its size and could therefore be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2007 PS 45 to perhaps is a dwarf planet.

Provisions of the diameter for 2007 PS 45
year Dimensions km source
2018 336.0 Johnston
2018 358.0 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 523617 . SwRI (Space Science Department). Retrieved March 18, 2019.
  2. ↑ a b c (523617) 2007 PS45 at the IAU Minor Planet Center (English) Retrieved March 18, 2019.
  3. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  4. ↑ MPC : MPEC 2010-T51: 2007 PS45 . IAU . October 7, 2010. Retrieved March 18, 2019.
  5. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 18, 2019.
  6. ↑ (523617) 2007 PS45 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 18, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  7. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 18, 2019.
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 18, 2019.
  9. ↑ (523617) 2007 PS45 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
  10. ↑ a b Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 18, 2019.