JWST mid-infrared spectroscopy of centaurs and small trans-Neptunian objects: Linking the inner and outer Solar System

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Volume 699 (July 2025)

A&A, 699 (2025) A167

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Table 2

NEATM best-fit parameters and other measurements of interest.

Object	S/N	H_v	R (km)	ρ_v	η	R^ref (km)	$ρ_{v}^{r e f}$ $\[\rho_{v}^{r e f}\]$	η^ref
10199 Chariklo	72	7.00 ± 0.2	129.2 ± 1.1	0.042 ± 0.008	0.85 ± 0.01	$120_{- 4}^{+ 5}$ $\[120_{-4}^{+5}\]$ ^(a)	${0.037}_{- 0.008}^{+ 0.009}$ $\[0.037_{-0.008}^{+0.009}\]$ ^(a)	${1.58}_{- 0.08}^{+ 0.15}$ $\[1.58_{-0.08}^{+0.15}\]$ ^(a)
						118.4 ± 3.4 ^(b)	${0.037}_{- 0.008}^{+ 0.010}$ $\[0.037_{-0.008}^{+0.010}\]$ ^(b)	${1.17}_{- 0.08}^{+ 0.05}$ $\[1.17_{-0.08}^{+0.05}\]$ ^(b)
44594 (1999 OX3)	13	7.07 ± 0.2	54.64 ± 1.50	0.220 ± 0.040	0.66 ± 0.01	$67_{- 6}^{+ 7}$ $\[67_{-6}^{+7}\]$ ^(c)	${0.081}_{- 0.015}^{+ 0.018}$ $\[0.081_{-0.015}^{+0.018}\]$ ^(c)	${1.04}_{- 0.22}^{+ 0.27}$ $\[1.04_{-0.22}^{+0.27}\]$ ^(c)
54598 Bienor	42	7.46 ± 0.2	75.65 ± 4.50	0.080 ± 0.015	1.37 ± 0.05	$99_{- 6}^{+ 5}$ $\[99_{-6}^{+5}\]$ ^(a)	${0.041}_{0.012}^{+ 0.016}$ $\[0.041_{0.012}^{+0.016}\]$ ^(a)	${1.58}_{- 0.11}^{+ 0.15}$ $\[1.58_{-0.11}^{+0.15}\]$ ^(a)
						$99_{- 4}^{+ 3}$ $\[99_{-4}^{+3}\]$ ^(d)	${0.043}_{- 0.012}^{+ 0.016}$ $\[0.043_{-0.012}^{+0.016}\]$ ^(d)	${1.58}_{- 0.07}^{+ 0.07}$ $\[1.58_{-0.07}^{+0.07}\]$ ^(d)
468861 (2013 LU28)	227	8.29 ± 0.2	52.04 ± 0.12	0.079 ± 0.014	0.86 ± 0.01	−	−	−
2020 VF1	115	9.93 ± 0.2	28.51 ± 0.25	0.058 ± 0.011	0.84 ± 0.02	−	−	−
459865 (2013 XZ8)	181	9.50 ± 0.2	36.53 ± 0.08	0.053 ± 0.010	0.79 ± 0.01	−	−	−
469442 (2002 GG166)	8	8.23 ± 0.02	51.29 ± 5.10	0.08 ± 0.03	1.00 (fixed)	−	−	−

Notes. The signal-to-noise ratio was estimated in the 12–25 μm range. H_v was retrieved from the IMCCE database SsODNet (Berthier et al. 2023) for all objects except for Chariklo, for which we considered H_v=7.0 ± 0.2 instead of the IMCCE value (6.54) because the magnitude of Chariklo varies in time due to its elliptical form and its rings (Braga-Ribas et al. 2014; Lellouch et al. 2017). We assumed G=0.15 for all our targets. “ref” refers to earlier measurements (^(a) Lellouch et al. 2017, ^(b) Fornasier et al. 2013, ^(c) Lellouch et al. 2013, and ^(d) Duffard et al. 2014).

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