S / 2007 (119979) 1

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S / 2007 (119979) 1
Central body (119979) 2002 WC 19
Properties of the orbit
Major semi-axis 4090 ± 90 km
Periapsis 3272 km
Apoapsis 4908 km
eccentricity 0.20 ± 0.05
Orbital time 8.403 ± 0.001 d
Physical Properties
Apparent brightness 24.2 mag
Medium diameter 126 km
discovery
Explorer

Keith S. Noll
William M. Grundy
Susan D. Benecchi
Harold F. Levison
Denise C. Stephens

Date of discovery November 5, 2006

S / 2007 (119979) 1 is a moon of the trans-Neptunian object (119979) 2002 WC 19 , which is classified as Twotino in terms of orbital dynamics . The companion is about a third to a quarter the diameter of the mother planetoid.

Discovery and naming

S / 2007 (119979) 1 was discovered on November 5, 2006 by a team of astronomers consisting of Keith Noll, Will Grundy, Susan Benecchi, Harold Levison and Denise Stephens, on recordings from 2002 WC 19 with the Hubble Space Telescope . The discovery was announced on February 27, 2007, the moon was given the provisional designation S / 2007 (119979) 1 . (As of March 2, 2019)

Track properties

S / 2007 (119979) 1 orbits the common barycenter in an elliptical orbit at a mean distance of 4090 km from the planetoid (15.58 2002 WC 19 - or 64.92 S / 2007 (119979) 1 radii) and requires 8 days 9 hours 40.3 minutes, which corresponds to 14,258.1 laps in a 2002 WC 19 year. The orbital eccentricity is 0.2, the inclination is currently unknown.

size

The diameter of S / 2007 (119979) 1 is currently estimated at 126 km, based on an estimated reflectivity of 5%, analogous to the mother planetoid. The discovery of the moon does not seem to have any significant influence on the determination of the size of the mother planetoid, which, according to current estimates, is still 525 km in size. Thus S / 2007 (119979) 1 should have 24% of the diameter of 2002 WC 19 . The diameter of the moon could, however, be up to 31.6 ± 0.059% of the asteroid, which would increase its diameter to 166 km, based on a size of 525 km for 2002 WC 19 . The mass of the system has not yet been calculated.

The apparent magnitude of S / 2007 (119979) 1 is 24.2  m .

Determination of the diameter for S / 2007 (119979) 1
year Dimensions km source
2014 126.0 Grundy et al. a.
2015 139.0 Johnston
The most precise determination is marked in bold .

See also

Individual evidence

  1. ↑ a b c Wm. R. Johnston: (119979) 2002 WC19 . Johnston's Archives. January 31, 2015. Accessed January 30, 2019.
  2. ↑ W. Grundy et al. a .: The orbit of transneptunian binary Manwe and Thorondor and their upcoming mutual events . In: Icarus . 237, April 16, 2014, pp. 1-8. arxiv : 1404.4393 . bibcode : 2014Icar..237 .... 1G . doi : 10.1016 / j.icarus.2014.04.021 .
  3. ↑ a b K. Noll and a .: Binaries in the Kuiper Belt (PDF) . In: University of Arizona Press . 592, March 17, 2007, pp. 345-363. bibcode : 2008ssbn.book..345N .
  4. ↑ a b W. Grundy: Orbit Status of Known Binary TNOs . Lowell Observatory . Retrieved February 8, 2019.
  5. ↑ Marc W. Buie : Orbit Fit and Astrometric record for 119979. SwRI (Space Science Department), accessed January 31, 2019 .
  6. ↑ Brian G. Marsden: MPEC 2009-R09: Distant Minor Planets (2009 SEPT 16.0 TT.) . In: IAU Minor Planet Center . September 16, 2009. Retrieved January 29, 2019.
  7. ↑ W. Grundy: TNBS with known P, a, and e . Lowell Observatory . September 14, 2014. Retrieved February 8, 2019.