Index géographique et ethnique

Michel, N.; Lellouch, Benjamin

doi:10.1163/9789004232082_018

Cited by 1 publication

(2 citation statements)

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“…Densities higher than 2000 kg m −3 have only been measured for the larger KBOs, Eris Sicardy et al 2011), Pluto (Null, Owen & Synnott 1993;Buie et al 2006), Haumea (Rabinowitz et al 2006;Lacerda & Jewitt 2007) and Quaoar (Fornasier et al 2013). Densities for objects with diameters similar to SQ 317 tend to fall in the range 500 < ρ < 1000 kg m −3 (Grundy et al 2012;Stansberry et al 2012) with the possible exception of (88611) Teharonhiawako with ρ ≈ 1400 kg m −3 (Osip, Kern & Elliot 2003;Lellouch et al 2013). If confirmed, the Roche model density of SQ 317 would make it one of the highest density known KBOs and the densest of its size.…”

Section: Discussionmentioning

confidence: 99%

“…Although its surface is blue and possibly water-ice rich, these properties do not necessary imply high albedo. For instance, 2002 MS 4 has blue colour (B − R ≈ 1.0 mag; Peixinho et al 2012) but low albedo (p V ≈ 0.05; Lellouch et al 2013), and Quaoar displays strong water-ice absorption (Jewitt & Luu 2004) despite its relatively dark (p V ≈ 0.12; Lellouch et al 2013) and red surface (B − R ≈ 1.6 mag; Peixinho et al 2012). Water ice has been spectroscopically detected on objects with albedos as low as 0.04, e.g.…”

Section: Discussionmentioning

confidence: 99%

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The unusual Kuiper belt object 2003 SQ317

Lacerda¹,

McNeill²,

Peixinho

2013

Monthly Notices of the Royal Astronomical Society

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We report photometric observations of Kuiper belt object 2003 SQ 317 obtained between 2011 August 21 and 2011 November 1 at the 3.58 m New Technology Telescope, La Silla. We obtained a rotational lightcurve for 2003 SQ 317 with a large peak-to-peak photometric range, ∆m = 0.85 ± 0.05 mag, and a periodicity, P = 7.210 ± 0.001 hr. We also measure a nearly neutral broadband colour B − R = 1.05 ± 0.18 mag and a phase function with slope β = 0.95 ± 0.41 mag/ • . The large lightcurve range implies an extremely elongated shape for 2003 SQ 317 , possibly as a single elongated object but most simply explained as a compact binary. If modelled as a compact binary near hydrostatic equilibrium, the bulk density of 2003 SQ 317 is near 2670 kg m −3 . If 2003 SQ 317 is instead a single, elongated object, then its equilibrium density is about 860 kg m −3 . These density estimates become uncertain at the 30% level if we relax the hydrostatic assumption and account for solid, "rubble pile"-type configurations. 2003 SQ 317 has been associated with the Haumea family based on its orbital parameters and nearinfrared colour; we discuss our findings in this context. If confirmed as a close binary, 2003 SQ 317 will be the second object of its kind identified in the Kuiper belt.

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