Evidence for differentiation of the most primitive small bodies

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Table 1

Mass, density, and quadrupole J₂ of Sylvia, derived using either Romulus, Remus, or both satellites, from the literature compared with the present study.

Satellite	Nobs	Mass		Density		J₂		Reference
		(×10¹⁹ kg)		(kg m⁻³)
Romulus	24	1.48 ±	0.01	1200 ±	100	0.17 ±	0.05	Marchis et al. (2005)
Remus	12	1.47 ±	0.01	1200 ±	100	0.18 ±	0.01	Marchis et al. (2005)
Both	45+20	1.484 ±	0.015	1290 ±	390	0.099 59 ±	0.000 84	Fang et al. (2012)
Both	51+17	1.476 ±	0.006	1200 ±	100	0.000 002 ±	0.000 300	Beauvalet & Marchis (2014)
Romulus	65	1.476 ±	0.166	1380 ±	150	0 ±	0.01	Berthier et al. (2014)
Remus	25	1.380 ±	0.223	1290 ±	200	0 ±	0.024	Berthier et al. (2014)
Romulus	76	1.470 ±	0.008	1350 ±	40	–		Drummond et al. (2016)
Both	143+68	1.44 ±	0.01	1378 ±	45	0 ±	0.01	Present study

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