(495603) 2015 AM ₂₈₁

Asteroid (495603) 2015 AM 281
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	RKBO 2: 5 or SDO , "Distant Object"
Major semi-axis	55.137  AU
eccentricity	0.25
Perihelion - aphelion	41.357 AU - 68.916 AU
Inclination of the orbit plane	26.7 °
Length of the ascending node	22.1 °
Argument of the periapsis	158.2 °
Time of passage of the perihelion	May 15, 2047
Sidereal period	409 a 5.0 M.
Mean orbital velocity	3.978 km / s
Physical Properties
Medium diameter	approx. 479 km
Albedo	0.07-0.09
Absolute brightness	4.8 - 5.2 mag
history
Explorer	Pan-STARRS : B. Gibson T. Goggia N. Primak A. Schultz M. Willman
Date of discovery	March 13, 2010
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.

(495603) 2015 AM ₂₈₁ is a large trans-Neptunian object that is classified as a resonant Kuiper belt object (2: 5 resonance) or as a scattered disc object (SDO). Because of its size, the asteroid is a dwarf planet candidate .

discovery

2015 AM ₂₈₁ was discovered on March 13, 2010 by an astronomical team , consisting of B. Gibson, T. Goggia, N. Primak, A. Schultz and M. Willman, with the 1.8 m Pan-STARRS telescope (PS1 ) discovered at Haleakalā Observatory ( Maui ). The discovery was announced on July 24, 2016, the planetoid was given the minor planet number 495603 on June 9, 2017 .

After its discovery, in 2015 AM _{281 could be identified} on photos up to April 6, 2000, which were taken as part of the Sloan Digital Sky Survey program at the Apache Point Observatory ( New Mexico ), thus reversing its observation period Extend 10 years to more accurately calculate its orbit. In June 2017, a total of 58 observations were made over a period of 18 years. The last observation so far was made in May 2017 at the San Marcello Pistoiese Observatory . (As of February 24, 2019)

properties

Orbit

2015 AM ₂₈₁ orbits the sun in 409.42 years in an elliptical orbit between 41.36  AU and 68.92 AU from its center. The orbital eccentricity is 0.250, the web is 26.72 ° to the ecliptic inclined . The planetoid is currently 43.51 AU from the sun. He will next pass perihelion in 2047, so the last perihelion should have occurred in 1637.

Marc Buie ( DES ) classifies the planetoid (such as 2002 TC ₃₀₂ ) as RKBO ( 2: 5 resonance with Neptune ), while the Minor Planet Center lists it as SDO / Centaur and generally 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 .

Since it can be assumed that 2015 AM ₂₈₁ 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 expects that it is at 2015 AM ₂₈₁ to possibly is a dwarf planet.

Provisions of the diameter for 2015 AM ₂₈₁

year	Dimensions km	source
2018	486.0	Johnston
2018	479.0	Brown
The most precise determination is marked in bold .

See also

• List of trans-Neptunian objects
• List of dwarf planets of the solar system
• List of asteroids
• List of moons from asteroids

Web links

• Photos from 2015 AM ₂₈₁ (May 2017, San Marcello Pistoiese Observatory)
• How many dwarf planets are there in the outer solar system? Current list of the largest TNOs from Mike Brown
• Free the dwarf planets! Mike Brown's column on the IAU and the dwarf planets regarding their classifications (23 August 2011)

Individual evidence

1. ^ ^{A b} Marc W. Buie : Orbit Fit and Astrometric record for 495603 . 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} (495603) 2015 AM281 at the IAU Minor Planet Center (English) Retrieved on February 24, 2019.
4. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
5. ↑ MPC : MPEC 2016-O294: 2015 AM281 . IAU . July 24, 2016. Accessed February 24, 2019.
6. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved on February 24, 2019., reference there: MPC 105261
7. ↑ (495603) 2015 AM281 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved February 24, 2019.
8. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved February 24, 2019.
9. ^ Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved February 24, 2019.