(470599) 2008 OG ₁₉

Asteroid (470599) 2008 OG 19th
Properties of the orbit ( animation ) Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type	SDO , "Distant Object"
Major semi-axis	67,364  AU
eccentricity	0.427
Perihelion - aphelion	38,577 AU - 96,151 AU
Inclination of the orbit plane	13.1 °
Length of the ascending node	164.1 °
Argument of the periapsis	140.5 °
Time of passage of the perihelion	September 28, 2013
Sidereal period	552 a 10.8 M
Mean orbital velocity	3.599 km / s
Physical Properties
Medium diameter	${\displaystyle 619_{-113}^{+56}\mathrm {km} }$
Albedo	0.07-0.10
Medium density	0.609 g / cm³
Rotation period	8.727 ± 0.003 h (0.364 d ) 2.400 ± 0.500 h (0.100 d )
Absolute brightness	4.39 ± 0.07 - 4.7 mag
Spectral class	C B-V = 0.940 ± 0.014 VR = 0.530 ± 0.010 VI = 1.120 ± 0.014 BR = 1.470 ± 0.010
history
Explorer	Megan E. Schwamb Michael E. Brown David L. Rabinowitz
Date of discovery	July 30, 2008
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.

(470599) 2008 OG ₁₉ is a large Trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of its orbit dynamics . Because of its size, the asteroid is a dwarf planet candidate .

discovery

(470599) 2008 OG ₁₉ was discovered on July 30, 2008 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 ) discovered. The discovery was confirmed by the Cerro Tololo Observatory and announced on September 4, 2008 together with 2008 NW ₄ , the planetoid was later given the minor planet number 470599 by the IAU .

The observation arc of the asteroid begins with the official discovery observation on July 30, 2008. Since then, the asteroid has been observed by various earth-based telescopes. In April 2017, a total of 157 observations were made over a period of 8 years. The last observation so far was carried out in August 2018 at the Purple Mountain Observatory ( People's Republic of China ). (As of March 19, 2019)

properties

Orbit

2008 OG ₁₉ orbits the sun in 552.90 years on a highly elliptical orbit between 38.58  AU and 96.15 AU from its center. The orbital eccentricity is 0.427, the orbit is inclined 13.14 ° to the ecliptic . Currently, the planetoid is 38.75 AU from the sun. The last time he passed through perihelion was in 2013, so the next perihelion should take place in 2566.

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

Size and rotation

A calculated diameter of 619 km is currently assumed; this value is based on an assumed typically low reflectivity for SDO. Based on this diameter, the total surface area is around 1,204,000 km ² . The apparent brightness of 2008 OG ₁₉ is 21.02  ^m .

It can be assumed that 2008 OG ₁₉ is in hydrostatic equilibrium and the asteroid is therefore a dwarf planet candidate , based on Mike Brown's taxonomic 5-class system . The latter himself estimates the diameter of the asteroid at 490 km on the basis of an assumed albedo of 7% and an absolute brightness of 5.1  ^m . Mike Brown believes that 2008 OG ₁₉ may be a dwarf planet.

2008 OG ₁₉ seems to have an elongated shape due to its exceptionally low density of 0.609 g / cm ³ , as is the case with Varuna .

On the basis of light curve observations , 2008 OG ₁₉ rotates once in 8 hours and 43.6 minutes around its axis, which is inclined by 13.2 ° in relation to its plane . From this it follows that in a 2008 OG ₁₉ year it performs 555,374.5 self- rotations ("days"). A different result from another team of astronomers suggested a rotation period of 2 hours and 24 minutes, which would increase the number of 2008 OG ₁₉ days to 2,019,480.4 revolutions. The latter assessment is considered the less likely.

Provisions of the diameter for 2008 OG ₁₉

year	Dimensions km	source
2012	482.53	LightCurve DataBase
2015	619.0 +56.0−113.0	Fernández-Valenzuela u. a.
2018	509.0	Johnston
2018	490.0	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

Individual evidence

1. ^ ^{A b} Marc W. Buie : Orbit Fit and Astrometric record for 470599 . SwRI (Space Science Department). Retrieved March 19, 2019.
2. ↑ ^{a b} MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 19, 2019.
3. ↑ ^{a b c} Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 19, 2019.
4. ↑ ^{a b c} (470599) 2008 OG19 at the IAU Minor Planet Center (English) Retrieved on March 19, 2019.
5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
6. ↑ ^{a b c d e f} E. Fernández-Valenzuela u. a .: 2008 OG ₁₉ : A highly elongated Trans-Neptunian Object (PDF) . In: Monthly Notices of the Royal Astronomical Society . November 18, 2015. arxiv : 1511.06584 . doi : 10.1093 / mnras / stv2739 .
7. ↑ ^{a b} R. Behrend: Courbes de rotation d'astéroïdes et de comètes . Observatoire de Genève. 2015. Retrieved March 19, 2019.
8. ↑ ^{a b} LCDB Data for (470599) 2008 OG19 . MinorPlanetInfo. 2015. Retrieved March 19, 2019.
9. ↑ ^{a b c} O. Hainaut u. a .: Colors of minor bodies in the outer solar system. II. A statistical analysis revisited (PDF) . In: Astronomy and Astrophysics . 546, No. A115, September 10, 2012, p. 20. arxiv : 1209.1896 . bibcode : 2012A & A ... 546A.115H . doi : 10.1051 / 0004-6361 / 201219566 .
10. ↑ N. Peixinho et al. a .: The bimodal colors of Centaurs and small Kuiper belt objects (PDF) . In: Astronomy and Astrophysics . 546, No. A86, June 14, 2012, p. 12. arxiv : 1206.3153 . bibcode : 2012A & A ... 546A..86P . doi : 10.1051 / 0004-6361 / 201219057 .
11. ↑ MPC : MPEC 2008-R20: 2008 NW4, 2008 OG19 . IAU . September 4, 2008. Retrieved March 19, 2019.
12. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 19, 2019.
13. ↑ (470599) 2008 OG19 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 19, 2019.
14. ↑ MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 19, 2019.
15. ↑ (470599) 2008 OG19 in the database of the "Asteroids - Dynamic Site" (AstDyS-2, English).
16. ↑ ^{a b} Mike Brown : How many dwarf planets are there in the outer solar system? . CalTech . November 12, 2018. Retrieved March 19, 2019.
17. ↑ E. Fernández-Valenzuela and a .: A Varuna-like Transneptunian Object (PDF) . Instituto de Astrofísica de Andalucía. 2017. Retrieved March 19, 2019.