(523780) 2015 AN 281

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Asteroid
(523780) 2015 AN 281
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type DO (E SDO ), or
CKBO ( «Hot» )
«Distant Object»
Major semi-axis 41.972  AU
eccentricity 0.144
Perihelion - aphelion 35.925 AU - 48.018 AU
Inclination of the orbit plane 17.5 °
Length of the ascending node 53.4 °
Argument of the periapsis 226.5 °
Time of passage of the perihelion April 13, 2090
Sidereal period 271 a 11.0 M
Mean orbital velocity 4.560 km / s
Physical Properties
Medium diameter approx. 373 km
Albedo 0.08-0.09
Absolute brightness 5.2 - 5.6 mag
history
Explorer Pan-STARRS :
B. Gibson
T. Goggia
N. Primak
A. Schultz
M. Willman
Date of discovery January 15, 2015
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.

(523780) 2015 AN 281 is a large trans-Neptunian object in the Kuiper Belt , which is classified as an extended Scattered Disk Object (DO) or as a Cubewano (CKBO) in terms of orbital dynamics. Due to its size, the asteroid may be one of the dwarf planet candidates .

discovery

2015 AN 281 was discovered on January 15, 2015 by a team of astronomers , consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, on images from the 1.8 m Pan-STARRS telescope ( PS1) made on January 24th, 2011, discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 17, 2016 the asteroid was given on 25 September by the IAU , the Minor Planet -number 523780 .

After its discovery, AN 281 could be identified in 2015 going back to December 21, 2004 as part of the Sloan Digital Sky Survey (SDSS) program at the Apache Point Observatory ( New Mexico ), thus changing its observation period Extend eleven years to more accurately calculate its orbit. Since then, the planetoid has been observed through various earth-based telescopes. In October 2018, a total of 143 observations over a period of 14 years were available. The last observation so far was again carried out in March 2018 at the Pan-STARRS telescope (PS1). (As of March 14, 2019)

properties

Orbit

2015 AN 281 orbits the sun in 271.92 years on a slightly elliptical orbit between 36.33  AU and 44.04 AU from its center. The orbit eccentricity is 0.144, the orbit is 17.45 ° inclined to the ecliptic . The planetoid is currently 43.94 AU from the Sun. He will next pass perihelion in 2090, so the last perihelion should have occurred in 1818.

Marc Buie ( DES ) classifies the planetoid as an extended SDO (ESDO or DO ), 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” . The Johnston's Archive, however, lists him as Cubewano , whereby he would belong to the "hot" classic KBO in terms of rail dynamics .

size

A diameter of 373 km is currently assumed, based on a reflectivity of 8% and an absolute brightness of 5.6  m . Based on this diameter, the total surface area is around 437,000 km 2 . The apparent magnitude of 2015 AN 281 is 21.65  m .

Since it is conceivable that 2015 AN 281 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 expects that it is ON at 2015 281 to perhaps is a dwarf planet.

Provisions of the diameter for 2015 AN 281
year Dimensions km source
2018 404.0 Johnston
2018 373.0 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 523780 . SwRI (Space Science Department). Retrieved March 14, 2019.
  2. ↑ a b c Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 14, 2019.
  3. ↑ a b c (523780) 2015 AN281 at the IAU Minor Planet Center (English) Retrieved on March 14, 2019.
  4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  5. ↑ MPC : MPEC 2016-O173: 2015 AN281 . IAU . July 17, 2016. Retrieved March 14, 2019.
  6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 14, 2019.
  7. ↑ (523780) 2015 AN281 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 14, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  8. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 14, 2019.
  9. ↑ (523780) 2015 AN281 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 14, 2019.