(15874) 1996 TL 66

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Asteroid
(15874) 1996 TL 66
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type SDO ,
"Distant Object"
Major semi-axis 82.533  AU
eccentricity 0.576
Perihelion - aphelion 34,989 AU - 130,077 AU
Inclination of the orbit plane 24 °
Length of the ascending node 217.8 °
Argument of the periapsis 184.2 °
Time of passage of the perihelion April 9, 2001
Sidereal period 749 a 9.7 M
Mean orbital velocity 3.252 km / s
Physical Properties
Medium diameter
Albedo
Medium density ≈ 2.0 g / cm³
Rotation period 12.0 ± 1.0 h (0.5 d )
Absolute brightness 5.39 ± 0.12 mag
Spectral class C
B-V = 0.730 ± 0.030
VR = 0.370 ± 0.020
VI = 0.720 ± 0.010
BR = 1.113 ± 0.070
history
Explorer Chadwick A. Trujillo
David C. Jewitt
Jane X. Luu
Jun Chen
Date of discovery October 9, 1996
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.

(15874) 1996 TL 66 is a large trans-Neptunian object that is classified as a Scattered Disk Object (SDO) in terms of orbital dynamics . Due to its size, the asteroid may be one of the dwarf planet candidates . It is the first TNO discovered to be classified as an SDO; however, the (48639) 1995 TL 8 discovered a year earlier was later also classified as an SDO.

discovery

1996 TL 66 was on 9 October 1996 by a team of astronomers consisting Chad Trujillo , Dave Jewitt , Jane Luu and June Chen , at the Mauna Kea Observatories ( Hawaii discovered). The discovery was announced on January 30, 1997, the planetoid was later given the minor planet number 15874 by the IAU .

The observation arc of the planetoid begins with the official discovery observation on October 9, 1996. Since then, the planetoid has been observed by the Spitzer , Hubble and Herschel space telescopes as well as various earth-based telescopes. In April 2017, a total of 285 observations over a period of 19 years were available. The last observation so far was carried out in January 2018 at the Pan-STARRS telescope (PS1) ( Maui ). (As of March 20, 2019)

properties

The 1996 orbit TL 66 (blue, light blue) compared to Pluto and the three outer giant planets.

Orbit

1996 TL 66 orbits the sun in 749.81 years in a strongly elliptical orbit between 34.99  AU and 130.08 AU from its center. The orbit eccentricity is 0.576, the orbit is inclined 24.01 ° to the ecliptic . The planetoid is currently 37.79 AU from the sun. The last time he went through perihelion was in 2001, the next perihelion should therefore take place in 2751.

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

Initial estimates showed a diameter of about 630 km, making TL 66 one of the largest Trans-Neptunian objects at the time of its discovery in 1996 . Investigations with the Spitzer space telescope resulted in a value of 575 km, based on a relatively deep reflectivity of 3.5% and an absolute brightness of 5.46  m. Based on more recent measurements, which are combined with the older data using the data from the Herschel space telescope determined, a diameter of 339 km is currently assumed, based on a higher reflectivity of 11% and an absolute brightness of 5.39  m . Based on this diameter, the total area is about 361,000 km². The apparent brightness of 1996 TL 66 is 21.31  m , the mean surface temperature is estimated based on the distance from the sun to 31  K (−242 ° C).

Since it is conceivable that 1996 TL 66 is in hydrostatic equilibrium due to its size and could therefore be largely round, it may meet the criteria for classification as a dwarf planet , based on Mike Brown's taxonomic 5-class system . The latter himself estimates the diameter of the asteroid at 344 km on the basis of an assumed albedo of 11% and an absolute brightness of 5.4  m . Mike Brown believes that it is in 1996 TL 66 to perhaps is a dwarf planet. Gonzalo Tancredi rated TL 66 2010 as an almost safe dwarf planet in 1996 , but did not propose to the IAU that it be officially recognized as such.

On the basis of light curve observations , the 1996 TL 66 rotates once around its axis in 12 hours. As a result, he in a 1996 TL 66 547735.1 -year own twists performs ( "day"). However, this is still fraught with uncertainties, since the observation time at that time was insufficient and may also be completely wrong.

Provisions of the diameter for 1996 TL 66
year Dimensions km source
2000 632.0 +84.0−98.0 Thomas u. a.
2005 <958.0 Grundy et al. a.
2006 <958.0 Cruikshank et al. a.
2008 575.0 +116.0−115.0 Stansberry et al. a.
2008 638.0 Tancredi
2010 575.0 Tancredi
2012 339.0 ± 20.0 Santos-Sanz et al. a.
2015 349.54 LightCurve DataBase
2018 344.0 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 15874 . SwRI (Space Science Department). Retrieved March 20, 2019.
  2. ↑ a b MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 20, 2019.
  3. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 20, 2019.
  4. ↑ a b c (15874) 1996 TL66 at IAU Minor Planet Center (English) Retrieved March 20, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ a b c d P. Santos-Sanz u. a .: “TNOs are Cool”: A Survey of the Transneptunian Region IV. Size / albedo characterization of 15 scattered disk and detached objects observed with Herschel Space Observatory-PACS (PDF) . In: Astronomy and Astrophysics . 541, No. A92, February 7, 2012, p. 18. arxiv : 1202.1481 . bibcode : 2012A & A ... 541A..92S . doi : 10.1051 / 0004-6361 / 201118541 .
  7. ↑ a b A. Thirouin et al. a .: Short-term variability of a sample of 29 trans-Neptunian objects and Centaurs . In: Astronomy and Astrophysics . 522, No. A93, April 27, 2010, p. 43. arxiv : 1004.4841 . bibcode : 2010A & A ... 522A..93T . doi : 10.1051 / 0004-6361 / 200912340 .
  8. ↑ a b LCDB Data for (15874) . MinorPlanetInfo. 2015. Accessed March 20, 2019.
  9. ↑ a b c I. Belskaya et al. a .: Updated taxonomy of trans-neptunian objects and centaurs: Influence of albedo . In: Icarus . 250, April 2015, pp. 482-491. bibcode : 2015Icar..250..482B . doi : 10.1016 / j.icarus.2014.12.004 .
  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 1997-B18: 1996 TL66 . IAU . January 30, 1997. Retrieved March 20, 2019.
  12. ↑ MPC : MPEC 1997-C12: 1996 TL66 . IAU . February 15, 1997. Retrieved March 20, 2019.
  13. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 20, 2019.
  14. ↑ (15874) 1996 TL66 in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 20, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  15. ↑ (15874) 1996 TL66 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 20, 2019.
  17. ^ A b G. Tancredi: Physical and dynamical characteristics of icy “dwarf planets” (plutoids) (PDF) . In: International Astronomical Union (Ed.): Icy Bodies of the Solar System: Proceedings IAU Symposium No. 263, 2009 . 2010. doi : 10.1017 / S1743921310001717 . Retrieved March 1, 2019.
  18. ↑ N. Thomas et al. a .: Observations of the Trans-Neptunian Objects 1993 SC and 1996 TL 66 with the Infrared Space Observatory . In: The Astrophysical Journal . 534, No. 1, May 2000, pp. 446-455. bibcode : 2000ApJ ... 534..446T . doi : 10.1086 / 308724 .
  19. ↑ W. Grundy et al. a .: Various Albedos of Small Trans-Neptunian Objects (PDF) . In: Icarus . 176, No. 1, February 10, 2005, pp. 184-191. arxiv : astro-ph / 0502229 . bibcode : 2005Icar..176..184G . doi : 10.1016 / j.icarus.2005.01.007 .
  20. ↑ D. Cruikshank et al. a .: Physical Properties of Transneptunian Objects (PDF) . In: University of Arizona Press: Protostars and Planets . 951, 2006, pp. 879-893. bibcode : 2007prpl.conf..879C .
  21. ↑ J. Stansberry et al. a .: Physical Properties of Kuiper Belt and Centaur Objects: Constraints from Spitzer Space Telescope (PDF) . In: University of Arizona Press . 592, No. 161-179, February 20, 2007. bibcode : 2008ssbn.book..161S .
  22. ^ G. Tancredi, S. Favre: DPPH List . In: Dwarf Planets and Plutoid Headquarters, from Which are the dwarfs in the solar system? . August. Retrieved March 1, 2019.