S / 2008 (524531) 1

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S / 2008 (524531) 1
Central body (524531) 2002 XH 91
Properties of the orbit
Major semi-axis 22400 ± 400 km
Periapsis 6500 km
Apoapsis 38300 km
eccentricity 0.71 ± 0.02
Orbit inclination 3.0 °
Orbital time 371.1 ± 0.2 d
Physical Properties
Albedo 0.08-0.09
Apparent brightness 23.9 likes
Medium diameter approx. 185 km
discovery
Explorer

Keith S. Noll
William M. Grundy
Susan D. Benecchi (–Kern)
Elizabeth A. Barker
Harold F. Levison

Date of discovery November 8, 2008

S / 2008 (524531) 1 is a moon of the trans-Neptunian object (524531) 2002 XH 91 , which is classified as «cold» Cubewano in terms of orbital dynamics . The companion is about two thirds the diameter of the mother planetoid. Since both celestial bodies revolve around the common center of gravity , the system can also be understood as a double asteroid system.

discovery

S / 2008 (524531) 1 was discovered on November 8, 2008 by a team of astronomers consisting of Keith Noll ( GSFC ), Will Grundy ( Lowell Observatory ), Susan Benecchi (core) ( PSI ), Elizabeth Barker and Harold Levison through observations of 2002 XH 91 discovered with the Hubble Space Telescope . The discovery was announced on May 27, 2009, the moon was given the provisional designation S / 2008 (524531) 1 . (As of September 25, 2019)

Track properties

S / 2008 (524531) 1 orbits the common barycenter on a high-grade elliptical orbit at an average distance of 22400 km from the planetoid (150.3 2002 XH 91 - or 242.2 S / 2008 (524531) 1 radii) and is required for 371 days and 9 hours, which corresponds to 284.8 rounds in a 2002 XH 91 year. The orbit eccentricity is 0.71, the orbit is 3.00 ° inclined to the plane of the orbit of the planetoid .

size

The diameter of S / 2008 (524531) 1 is currently estimated at 185 km, based on an estimated reflectivity of 9%, analogous to the mother planetoid. Based on this diameter, the total surface area is around 108,000 km 2 . The discovery of the moon had an impact on the determination of the size of the mother planetoid, which according to current estimates has a size of 298 km. This means that S / 2008 (524531) 1 should have 62.1% of the diameter of 2002 XH 91 . The system mass was determined to be 6.5  ·  10 18 . The apparent magnitude of S / 2008 (2002 XH 91 ) 1 is 23.9  m .

Determination of the diameter for S / 2008 (524531) 1
year Dimensions km source
2013 185.0 Johnston
The most precise determination is marked in bold .

See also

Individual evidence

  1. ↑ a b W. Grundy: Orbit Status of Known Binary TNOs . Lowell Observatory . Retrieved March 24, 2019.
  2. ↑ a b W. Grundy: TNBs with known P, a, and e . Lowell Observatory . Retrieved March 24, 2019.
  3. ↑ a b W. Grundy: 2002 XH91 . Lowell Observatory . Retrieved March 24, 2019.
  4. ↑ a b Wm. R. Johnston: Asteroids with Satellites - 2002 XH91 . Johnston's Archives. September 20, 2014. Accessed March 24, 2019.
  5. ^ Marc W. Buie : Orbit Fit and Astrometric record for 02XH91 . SwRI (Space Science Department). Retrieved March 24, 2019.
  6. ↑ IAU : IAUC No. 9046: 2002 XH_91, V1280 Scorpii . In: Central Bureau for Astronomical Telegrams . May 27, 2009. bibcode : 2009IAUC.9046 .... 1N .