(15789) 1993 SC

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Asteroid
(15789) 1993 SC
Properties of the orbit ( animation )
Epoch:  April 27, 2019 ( JD 2,458,600.5)
Orbit type Plutino ,
"Distant Object"
Major semi-axis 39,419  AU
eccentricity 0.187
Perihelion - aphelion 32,033 AU - 46,806 AU
Inclination of the orbit plane 5.2 °
Length of the ascending node 354.6 °
Argument of the periapsis 316.1 °
Time of passage of the perihelion August 16, 1970
Sidereal period 247 a 6.0 M
Mean orbital velocity 4.705 km / s
Physical Properties
Medium diameter
Albedo
Absolute brightness 6.722 ± 0.074 - 7.26 mag
Spectral class C
B-V = 1.080 ± 0.080
VR = 0.700 ± 0.060
V-I = 1.490 ± 0.040
BR = 1.720 ± 0.140
history
Explorer Ivan P. Williams
Alan Fitzsimmons
Donal P. O'Ceallaigh
Date of discovery 17th September 1993
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.

(15789) 1993 SC is a large trans-Neptunian object that is classified as Plutino in terms of orbital dynamics . Due to its size, the asteroid is one of the dwarf planet candidates . 1993 SC was one of the first known TNO and the second Plutino to receive an asteroid number.

discovery

1993 SC was created on September 17, 1993 by a team of astronomers , consisting of Iwan Williams , Alan Fitzsimmons and Donal O'Ceallaigh, with the 2.5 m Isaac Newton reflecting telescope at the Roque de los Muchachos Observatory on the Canary Island La Palma discovered. The discovery was announced on September 22, 1993, the planetoid was later given the minor planet number 15789 by the IAU .

The observation arc of the asteroid begins with the official observation on September 17, 1993. Since then, the asteroid has been observed by various earth-based telescopes. In April 2017, there were a total of 86 observations over a period of 16 years. The last observation so far was made in September 2009 at Lowell Observatory, Arizona . (As of March 25, 2019)

properties

Animated orbit simulation of 1993 SC.

Orbit

1993 SC orbits the sun in 247.50 years on a slightly elliptical orbit between 32.03  AU and 46.81 AU from its center. The orbital eccentricity is 0.187, the web is 5.15 ° relative to the ecliptic inclined . The planetoid is currently 38.30 AU from the sun. He last passed through perihelion in 1970, so the next perihelion should take place in 2218.

Both Marc Buie ( DES ) and the Minor Planet Center classify the planetoid as Plutino ( 2: 3 resonance with Neptune ); the latter also generally lists it as a "distant object".

size

A diameter of 328 km is currently assumed, based on a comparatively deep reflectivity of 2.2% and an absolute brightness of 7.0  m . Based on this diameter, the total area is around 340,000 km². The apparent magnitude of 1993 SC is 22.97  m .

Since it is conceivable that 1993 SC 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 suggests that 1993 SC might be a dwarf planet; the latter estimates the diameter of the asteroid itself at 264 km, based on an albedo of 4% and an absolute brightness of 7.2  m .

The asteroid shows a reddish spectrum , the absorption bands of which show strong indications for the presence of methane ice .

Provisions of diameter for 1993 SC
year Dimensions km source
1997 240.0 Tegler u. a.
2000 328.0 +58.0−66.0 Thomas u. a.
2005 398.0 +108.0−171.0 Grundy et al. a.
2006 398.0 +110.0−171.0 Cruikshank et al. a.
2015 148.43 LightCurve DataBase
2018 264.0 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 15789 . SwRI (Space Science Department). Retrieved March 25, 2019.
  2. ↑ a b MPC : MPEC 2010-S44: Distant Minor Planets (2010 OCT.11.0 TT) . IAU . September 25, 2010. Retrieved March 25, 2019.
  3. ^ A b Wm. R. Johnston: List of Known Trans-Neptunian Objects . Johnston's Archives. October 7, 2018. Retrieved March 25, 2019.
  4. ↑ a b c (15789) 1993 SC at the IAU Minor Planet Center (English) Retrieved March 25, 2019.
  5. ↑ v ≈ π * a / period (1 + sqrt (1-e²))
  6. ↑ a b N. Peixinho u. 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 .
  7. ^ W. Romanishin, S. Tegler: Rotation rates of Kuiper-belt objects from their light curves . In: Nature . 398, No. 6723, March 1999, pp. 129-132. bibcode : 1999Natur.398..129R . doi : 10.1038 / 18168 .
  8. ^ W. Romanishin, S. Tegler: Accurate absolute magnitudes for Kuiper belt objects and Centaurs . In: Icarus . 179, No. 2, December 2005, pp. 523-526. bibcode : 2005Icar..179..523R . doi : 10.1016 / j.icarus.2005.06.016 .
  9. ↑ a b LCDB Data for (15789) . MinorPlanetInfo. 2015. Retrieved March 25, 2019.
  10. ↑ 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 .
  11. ↑ MPC : MPEC 1993-S10: 1993 SC . IAU . September 22, 1993. Retrieved March 25, 2019.
  12. ↑ MPC : MPC / MPO / MPS Archive . IAU . Retrieved March 25, 2019.
  13. ↑ (15789) 1993 SC in the Small-Body Database of the Jet Propulsion Laboratory (English). Retrieved March 25, 2019. Template: JPL Small-Body Database Browser / Maintenance / Alt
  14. ↑ MPC : MPEC List Of Centaurs and Scattered-Disk Objects . IAU . Retrieved March 25, 2019.
  15. ↑ (15789) 1993 SC 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 25, 2019.
  17. ^ I. Williams , D. O'Ceallaigh, A. Fitzsimmons , B. Marsden : The slow-moving objects 1993 SB and 1993 SC . In: Icarus . 116, No. 1, July 1995, pp. 180-185. bibcode : 1995Icar..116..180W . doi : 10.1006 / icar.1995.1119 .
  18. ^ S. Tegler, W. Romanishin: The Extraordinary Colors of Trans-Neptunian Objects 1994 TB and 1993 SC . In: Icarus . 126, No. 1, March 1997, pp. 212-217. bibcode : 1997Icar..126..212T . doi : 10.1006 / icar.1996.5646 .
  19. ^ S. Tegler, W. Romanishin u. a .: Photometry of the trans-neptunian object 1993 SC . In: The Astronomical Journal . 114, September 1997, pp. 1230-1233. bibcode : 1997AJ .... 114.1230T . doi : 10.1086 / 118556 .
  20. ↑ 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 .
  21. ↑ 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 .
  22. ↑ 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 .