(444745) 2007 JF 43

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Asteroid
(444745) 2007 JF 43
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type Plutino ,
"Distant Object"
Major semi-axis 39.67  AU
eccentricity 0.186
Perihelion - aphelion 32.294 AU - 47.046 AU
Inclination of the orbit plane 15.1 °
Length of the ascending node 207.4 °
Argument of the periapsis 120.8 °
Time of passage of the perihelion May 8, 2061
Sidereal period 249 a 10.3 M
Mean orbital velocity 4.690 km / s
Physical Properties
Medium diameter approx. 358 km
Albedo 0.08-0.10
Rotation period 9.52 ± 0.05 h (0.397 d )
Absolute brightness 5.3 - 5.7 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.

(444745) 2007 JF 43 is a large trans-Neptunian object in the Kuiper Belt , which is classified as Plutino in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2007 JF 43 was discovered on May 10, 2007 by a team of astronomers consisting of Meg Schwamb, Mike Brown and David Lincoln Rabinowitz , with 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 JH 43 , 2007 JJ 43 and 2007 JK 43 , the planetoid was later given the minor planet number 444745 by the IAU .

After its discovery in 2007, JF 43 could be identified in photos up to April 13, 2002, which were also taken at the Palomar Observatory as part of the Near Earth Asteroid Tracking Program (NEAT), thus extending its observation period by 17 years so to calculate its orbit more precisely. Since then, the planetoid has been observed through various earth-based telescopes. In May 2018, a total of 177 observations were made over a period of 35 years. The last observation so far was carried out in June 2015 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 15, 2019)

properties

Orbit

2007 JF 43 orbits the sun in 249.86 years on a slightly elliptical orbit between 32.29  AU and 47.05 AU from its center. The orbit eccentricity is 0.186, the orbit is inclined 15.06 ° to the ecliptic . The planetoid is currently 37.25 AU from the Sun. He will next pass perihelion in 2061, so the last perihelion should have taken place in 1811.

Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as Plutino ; the latter also lists it as a non-SDO and generally as a “distant object”.

Size and rotation

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 JF 43 is 21.30  m .

Since it is conceivable that 2007 JF 43 is in hydrostatic equilibrium due to its size and could thus be largely round, it may meet the criteria for classification as a dwarf planet . Mike Brown believes that it is in 2007 JF 43 to perhaps is a dwarf planet.

Based on light curve observations , 2007 JF 43 rotates once around its axis in 9 hours and 58.2 minutes. From this it follows that in a 2007 JF 43 year it performs 230075.0 self- rotations (“days”). However, this is still fraught with uncertainties, as the observation time at that time was insufficient and the error rate is around 30%.

Provisions of the diameter for 2007 JF 43
year Dimensions km source
2015 366.04 LightCurve DataBase
2018 386.0 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 444745 . SwRI (Space Science Department). Retrieved March 15, 2019.
  2. ↑ a b MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 15, 2019.
  3. ↑ a b c (444745) 2007 JF43 at the IAU Minor Planet Center (English) Retrieved March 15, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ 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 .
  6. ↑ a b LCDB Data for (312645) . MinorPlanetInfo. 2015. Accessed March 4, 2019.
  7. ↑ MPC : MPEC 2007-N14: 2007 JF43, 2007 JH43, 2007 JJ43, 2007 JK43 . IAU . July 5, 2007. Retrieved March 15, 2019.
  8. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 15, 2019.
  9. ↑ (444745) 2007 JF43 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 15, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  10. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 15, 2019.
  11. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 15, 2019.
  12. ↑ (444745) 2007 JF43 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.