Quantitative grain size estimation on airless bodies from the negative polarization branch - II. Dawn mission targets (4) Vesta and (1) Ceres

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Volume 684 (April 2024)

A&A, 684 (2024) A81

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Table 2

Polarimetrie data reduction results.

Object	Filter	n	α	P	θ_P	Pr	dP_r	θ_r	dθ_r
			(°)	(%)	(°)	(%)	(%)	(°)	(°)
Ceres ^(a)	J ^(a)	–	8.3	–	–	−1.740 ^(a)	0.020 ^(a)	83.40 ^(a)	0.10 ^(a)
Ceres ^(a)	J ^(a)	–	21.0	–	–	+0.840 ^(a)	0.020 ^(a)	22.30 ^(a)	0.50 ^(a)
Ceres	J	31	8.6	1.620	−2.37	−1.619	0.038	88.91	0.67
Ceres	J	17	13.1	1.054	+39.70	−1.053	0.023	88.97	0.61
Ceres	J	14	16.5	0.388	+35.13	−0.383	0.029	85.44	2.11
Ceres	J	17	18.9	0.289	−68.86	+0.288	0.032	1.58	3.15
Ceres	J	25	20.8	0.898	−83.42	+0.898	0.031	1.01	1.00

Ceres ^(a)	H ^(a)	–	8.3	–	–	−1.610 ^(a)	0.030 ^(a)	86.60 ^(a)	0.10 ^(a)
Ceres ^(a)	H ^(a)	–	21.0	–	–	+0.880 ^(a)	0.020 ^(a)	16.20 ^(a)	0.20 ^(a)
Ceres	H	31	8.6	1.558	−2.82	−1.558	0.046	89.36	0.85
Ceres	H	4	13.1	1.155	+40.00	−1.153	0.037	88.68	0.92
Ceres	H	15	16.5	0.273	+32.77	−0.273	0.028	87.80	2.97
Ceres	H	17	18.9	0.356	−69.82	+0.356	0.029	0.61	2.35

Ceres	K_s	31	8.6	1.626	− 1.92	−1.624	0.039	88.46	0.68
Ceres	K_s	20	13.1	1.063	+40.65	−1.061	0.049	88.03	1.33
Ceres	K_s	14	16.5	0.358	+32.52	−0.357	0.046	88.05	3.72
Ceres	K_s	13	18.9	0.535	−70.83	+0.535	0.050	0.40	2.69
Ceres	K_s	24	20.8	1.105	−80.27	+1.102	0.041	2.14	1.06

Vesta	J	55	4.1	0.657	−49.51	−0.657	0.038	89.53	1.63
Vesta	J	158	5.7	0.659	+52.90	−0.659	0.028	89.42	1.22
Vesta	J	20	10.4	0.674	−7.78	−0.672	0.089	87.92	3.77
Vesta	J	67	15.6	0.413	+22.18	−0.411	0.033	87.13	2.28
Vesta	J	31	20.7	0.128	+11.06	−0.122	0.033	81.19	7.43
Vesta	J	30	22.5	0.069	−28.91	−0.002	0.047	45.69	19.78

Vesta	H	16	4.1	0.636	−52.04	−0.632	0.255	87.05	11.48
Vesta	H	99	5.7	0.773	+52.92	−0.773	0.037	89.48	1.36
Vesta	H	18	10.4	0.792	+1.05	−0.770	0.078	83.25	2.82
Vesta	H	67	15.6	0.582	+21.48	−0.578	0.033	86.43	1.60
Vesta	H	31	20.7	0.197	+15.94	−0.195	0.033	86.08	4.77
Vesta	H	30	22.5	0.077	+4.72	−0.072	0.041	79.32	15.30

Vesta	K_s	45	4.1	0.906	−49.01	−0.906	0.048	89.97	1.51
Vesta	K_s	158	5.7	0.984	+51.64	−0.982	0.047	88.16	1.37
Vesta	K_s	20	10.4	1.017	−1.04	−1.003	0.093	85.34	2.63
Vesta	K_s	66	15.6	0.710	+20.74	−0.702	0.037	85.69	1.51
Vesta	K_s	29	20.7	0.366	+8.43	−0.337	0.044	78.56	3.46
Vesta	K_s	29	22.5	0.160	−15.27	−0.077	0.055	59.33	9.81

Notes. n: number of used polarimetric datasets after data filtering and outlier rejections (one set corresponds to four exposures). α: solar phase angle. P and dP: the total linear polarization degree and its uncertainty. θ_P: the position angle of the strongest electric field vector. P_r and dP_r: the proper linear polarization degree referring to the scattering plan and its uncertainty. θ_r and dθ_r: position angle of the strongest electric vector, with respect to the scattering plane normal vector, and its uncertainty. See Sect. 3.1 for the details of error calculations. ^(a)Data from Masiero et al. (2022).

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