S / 2018 (532037) 1

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S / 2018 (532037) 1
2013 FY27 small.png
2013 FY 27 and S / 2018 (2013 FY 27 ) 1 by the Hubble Space Telescope (2018).
Central body (532037) 2013 FY 27
Properties of the orbit
Major semi-axis 9800 ± 40 km
Periapsis unknown
Apoapsis unknown
Orbital time 15.0 d
Physical Properties
Albedo
Apparent brightness 25.2 - 25.4 mag
Medium diameter 186 km
discovery
Explorer

Scott S. Sheppard
Yanga R. Fernández
Arielle Moullet

Date of discovery 15th January 2018

S / 2018 (532037) 1 is a moon of the trans-Neptunian object (532037) 2013 FY 27 , which is classified as a scattered disc object in terms of orbital dynamics . The companion is about a quarter the diameter of the mother planetoid.

Discovery and naming

S / 2018 (532037) 1 was recorded on January 15, 2018 by a team of astronomers , consisting of Scott S. Sheppard and Yanga R. Fernández ( University of Hawaii ) and Arielle Moullet ( NRAO ), on recordings from 2013 taken by the Hubble Space Telescope in 2018 FY 27 discovered. The companion was found by the discoverers on the Hubble images at a distance of 0.17 arc seconds, with an apparent brightness 3.0 ± 0.2 m weaker . Both components of the system could be recognized as clearly separated by the recordings. The discovery was announced about six months later on August 10, 2018, the moon was given the provisional designation S / 2018 (532037) 1 . (As of September 25, 2019)

Track properties

S / 2018 (532037) 1 orbits the common barycentre at an average distance of 9800 km to the planetoid (26.4 2013 FY 27 - or 105.4 S / 2018 (532037) 1 radii) and needs about 15 days for this, which corresponds to around 10976 circulations in a 2013 FY 27 year. The orbital eccentricity and inclination of the companion are currently unknown.

size

The diameter of S / 2018 (532037) 1 is currently estimated at around 186 km, based on an estimated reflectivity of 17%, 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, has a size of 742 km. So S / 2018 (532037) 1 should be around 25.1% of the 2013 FY 27 diameter . The apparent magnitude of S / 2018 (532037) 1 is 25.2  m .

Provisions of the diameter for S / 2018 (532037) 1
year Dimensions km source
2018 190.0
186.0 		Sheppard et al. a.
The most precise determination is marked in bold .

The discoverers think it is conceivable that the moon could have originated analogously to the collision theory for the formation of the Earth's moon , similar to the moons of the other great Trans-Neptunes . The mass of the two bodies has not yet been determined.

See also

Individual evidence

  1. ↑ a b c d S. Sheppard u. a .: The Albedos, Sizes, Colors, and Satellites of Dwarf Planets Compared with Newly Measured Dwarf Planet 2013 FY 27 (PDF) . In: The Astronomical Journal . 156, No. 6, September 6, 2018, p. 270, 11. arxiv : 1809.02184 . bibcode : 2018AJ .... 156..270S . doi : 10.3847 / 1538-3881 / aae92a .
  2. ↑ a b W. Grundy: Orbit Status of Known Binary TNOs . Lowell Observatory . Retrieved March 2, 2019.
  3. ^ Marc W. Buie : Orbit Fit and Astrometric record for 13FY27 . SwRI (Space Science Department). Retrieved March 2, 2019.
  4. ^ S. Sheppard : A Satellite Search of a Newly Discovered Dwarf Planet (PDF) . In: HST Proposal . 15248, No. 25, August 2017. bibcode : 2017hst..prop15248S .
  5. ^ Wm. R. Johnston: 2013 FY27 . Johnston's Archives. September 23, 2018. Accessed March 2, 2019.