Size estimates of some optically bright KBOs

Altenhoff, W. J.; Bertoldi, F.; Menten, K. M.

doi:10.1051/0004-6361:20035603

Cited by 38 publications

(37 citation statements)

References 23 publications

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“…near a density of 1000 kg m −3 , the albedo is greater than 0.1, significantly higher than is generally assumed for TNOs. By way of comparison, the albedo of 1998 WW 31 for an assumed density of 1000 kg m −3 is p R =0.054 (Veillet et al 2002) and the average of 9 TNOs with radiometrically determined diameters is p R = 0.08 (Altenhoff et al 2004). …”

Section: Discussionmentioning

confidence: 99%

The orbit, mass, and albedo of transneptunian binary (66652) 1999 RZ253

Noll

Stephens

Grundy

et al. 2004

Icarus

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Section: Discussionmentioning

confidence: 99%

The orbit, mass, and albedo of transneptunian binary (66652) 1999 RZ253

Noll

Stephens

Grundy

et al. 2004

Icarus

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“…It is a red object (Santos-Sanz et al 2009), and its surface seems to be covered by some water ice (Barkume et al 2008). Observations in the millimeter range gave a first estimation of 2002 TC302 diameter to be less than 1211 km with an albedo >5.1% (Altenhoff et al 2004;Grundy et al 2005). Stansberry et al (2008) reported the detection of this body with MIPS in the two 24 and 70 μm bands with SNR < 5, and they estimated a diameter of 1150 +337 −325 km, a geometric albedo of 3.1 +2.9 −1.2 , and η = 2.3 ± 0.5.…”

Section: Resonant (84522) 2002 Tc302mentioning

confidence: 99%

TNOs are Cool: A survey of the trans-Neptunian region

Fornasier

Lellouch

Müller

et al. 2013

A&A

146

189

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Aims. Trans-Neptunian objects (TNOs) are bodies populating the Kuiper belt and they are believed to retain the most pristine and least altered material of the solar system. The Herschel open time key programme entitled "TNOs are Cool: A survey of the transNeptunian region" has been awarded 373 h to investigate the albedo, size distribution and thermal properties of TNOs and Centaurs. Here we focus on the brightest targets observed by both the PACS and SPIRE multiband photometers: the dwarf planet Haumea, six TNOs (Huya, Orcus, Quaoar, Salacia, 2002 UX25, and 2002 TC302), and two Centaurs (Chiron and Chariklo). Methods. Flux densities are derived from PACS and SPIRE instruments using optimised data reduction methods. The spectral energy distribution obtained with the Herschel PACS and SPIRE instruments over 6 bands (centred at 70, 100, 160, 250, 350, and 500 μm), with Spitzer-MIPS at 23.7 and 71.4 μm, and with WISE at 11.6 and 22.1 μm in the case of 10199 Chariklo, has been modelled with the NEATM thermal model in order to derive the albedo, diameter, and beaming factor. For the Centaurs Chiron and Chariklo and for the 1000 km sized Orcus and Quaoar, a thermophysical model was also run to better constrain their thermal properties. Results. We derive the size, albedo, and thermal properties, including thermal inertia and surface emissivity, for the 9 TNOs and Centaurs. Several targets show a significant decrease in their spectral emissivity longwards of ∼300 μm and especially at 500 μm. Using our size estimations and the mass values available in the literature, we also derive the bulk densities for the binaries Quaoar/Weywot (2.18 +0.43 −0.36 g/cm 3 ), Orcus/Vanth (1.53 +0.15 −0.13 g/cm 3 ), and Salacia/Actea (1.29 +0.29 −0.23 g/cm 3 ). Quaoar's density is similar to that of the other dwarf planets Pluto and Haumea, and its value implies high contents of refractory materials mixed with ices.

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“…In this technique, the measured thermal infrared flux (or fluxes) from an object is converted to a diameter using models in which the thermal emission properties and surface temperature distributions of the object are assumed (Altenhoff et al 2004;Cruikshank et al 2005). Owing to the uncertainties in the appropriate model parameters, errors in these size determinations are large.…”

Section: Introductionmentioning

confidence: 99%

Direct Measurement of the Size of 2003 UB313 from theHubble Space Telescope

Brown

Schaller

Roe

et al. 2006

ApJ

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We have used the Hubble Space Telescope to directly measure the angular size of the large Kuiper Belt object 2003 UB313. By carefully calibrating the point-spread function of a nearby field star, we measure the size of 2003 UB313 to be mas, corresponding to a diameter of km or a size ∼5% larger than 34.3 ‫ע‬ 1.4 2400 ‫ע‬ 100 Pluto. The V-band geometric albedo of 2003 UB313 is . The extremely high albedo is consistent with 86% ‫ע‬ 7% the frosty methane spectrum, the lack of red coloring, and the lack of observed photometric variation on the surface of 2003 UB313. Methane photolysis should quickly darken the surface of 2003 UB313, but continuous evaporation and redeposition of surface ices appears capable of maintaining the extreme albedo of this body.

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Size estimates of some optically bright KBOs

Cited by 38 publications

References 23 publications

The orbit, mass, and albedo of transneptunian binary (66652) 1999 RZ253

The orbit, mass, and albedo of transneptunian binary (66652) 1999 RZ253

TNOs are Cool: A survey of the trans-Neptunian region

Direct Measurement of the Size of 2003 UB313 from theHubble Space Telescope

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