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The mass and density of the dwarf planet (225088) 2007 OR10 | | Csaba Kiss
; Gabor Marton
; Alex H. Parker
; Will Grundy
; Aniko Farkas-Takacs
; John Stansberry
; Andras Pal
; Thomas Muller
; Keith S. Noll
; Megan E. Schwamb
; Amy C. Barr
; Leslie A. Young
; Jozsef Vinko
; | | Date: |
13 Mar 2019 | | Abstract: | The satellite of (225088) 2007 OR10 was discovered on archival Hubble Space
Telescope images and along with new observations with the WFC3 camera in late
2017 we have been able to determine the orbit. The orbit’s notable
eccentricity, e$approx$0.3, may be a consequence of an intrinsically eccentric
orbit and slow tidal evolution, but may also be caused by the Kozai mechanism.
Dynamical considerations also suggest that the moon is small, D$_{eff}$ $<$ 100
km. Based on the newly determined system mass of 1.75x10$^{21}$ kg, 2007 OR10
is the fifth most massive dwarf planet after Eris, Pluto, Haumea and Makemake.
The newly determined orbit has also been considered as an additional option in
our radiometric analysis, provided that the moon orbits in the equatorial plane
of the primary. Assuming a spherical shape for the primary this approach
provides a size of 1230$pm$50 km, with a slight dependence on the satellite
orbit orientation and primary rotation rate chosen, and a bulk density of
1.75$pm$0.07 g cm$^{-3}$ for the primary. A previous size estimate that
assumed an equator-on configuration (1535$^{+75}_{-225}$ km) would provide a
density of 0.92$^{+0.46}_{-0.14}$ g cm$^{-3}$, unexpectedly low for a 1000
km-sized dwarf planet. | | Source: | arXiv, 1903.5439 | | Services: | Forum | Review | PDF | Favorites | |
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