(307982) 2004 PG 115

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Asteroid
(307982) 2004 PG 115
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 91.457  AU
eccentricity 0.602
Perihelion - aphelion 36.38 AU - 146.535 AU
Inclination of the orbit plane 16.3 °
Length of the ascending node 230.3 °
Argument of the periapsis 75.7 °
Time of passage of the perihelion April 30, 2003
Sidereal period 874 a 7.9 m
Mean orbital velocity 3.089 km / s
Physical Properties
Medium diameter approx. 479 km
Albedo 0.07-0.09
Absolute brightness 4.8 - 5.2 mag
history
Explorer Michael E. Brown
Chadwick A. Trujillo
David L. Rabinowitz
Date of discovery August 4, 2004
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.

(307982) 2004 PG 115 is a large trans-Neptunian object in the Kuiper belt , which is classified as a scattered disc object in terms of orbital dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

2004 PG 115 was discovered on August 4, 2004 by a team of astronomers consisting of Mike Brown , Chad Trujillo and David Lincoln Rabinowitz as part of the Near Earth Asteroid Tracking Project (NEAT) with the 1.2 m Oschin Schmidt telescope discovered at the Palomar Observatory ( California ), which was confirmed by 34 observations with the 2.5 m telescope of the Apache Point Observatory from 2006 to 2007. The discovery was announced together with 2004 PF 115 , 2004 XA 192 and 2005 QU 182 on September 1, 2007, the planetoid was given the minor planet number 307982 .

After its discovery, PG 115 could be identified in photos up to June 10, 2002, which were also taken as part of the NEAT program at the Palomar Observatory, and thus its observation period was extended by two years in order to calculate its orbit more precisely . In October 2018, a total of 220 observations over a period of 16 years were available. The last observation so far was made in October 2018 at the Purple Mountain Observatory . (As of February 24, 2019)

properties

Orbit

2004 PG 115 orbits the sun in 874.66 years in a strongly elliptical orbit between 36.38  AU and 146.53 AU from its center. The orbital eccentricity is 0.602, the orbit is 16.29 ° inclined to the ecliptic . Currently, the planetoid is 38.53 AU from the sun. The last time he went through perihelion was in 2003, the next perihelion should take place around 2877/2878.

Both Marc Buie ( DES ) and the Minor Planet Center classify the asteroid as an SDO , the latter also generally lists it as a “distant object”.

Size and rotation

A diameter of around 479 km is currently assumed, based on a reflectivity of 7% and an absolute brightness of 5.2  m . The apparent magnitude of the 2004 PG 115 is 20.85  m .

Since it can be assumed that 2004 PG 115 is in hydrostatic equilibrium due to its size and therefore must be largely round, it should meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2004 PG 115 to possibly is a dwarf planet.

Provisions of the diameter for 2004 PG 115
year Dimensions km source
2018 486.0 Johnston
2018 479.0 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 307982 . SwRI (Space Science Department). Retrieved February 24, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved February 24, 2019.
  3. ↑ a b c (307982) 2004 PG115 at the IAU Minor Planet Center (English) Accessed February 24, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2008-E35: 2004 PG115 . IAU . March 4, 2008. Retrieved February 24, 2019.
  6. ↑ MPC : MPEC 2007-R03: 2004 PF115, 2004 PG115, 2004 XA192, 2005 QU182 . IAU . March 4, 2008. Retrieved February 24, 2019.
  7. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved February 24, 2019.
  8. ↑ (307982) 2004 PG115 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 24, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  9. ↑ (307982) 2004 PG115 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 February 24, 2019.
  11. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 24, 2019.