A large topographic feature on the surface of the trans-Neptunian object (307261) 2002 MS4 measured from stellar occultations

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Volume 678 (October 2023)

A&A, 678 (2023) A167

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Table 2

Target stars designation and geocentric coordinates at closest approach instant (UT) sorted by occultation date (day-month-year).

Date	Gaia DR3 designation	Propagated right ascension (hh mm ss.sssss)	Error (mas)	Propagated declination (°' '')	Error (mas)	V ^(a) (mag)	K ^(a) (mag)	S _Diam^(b) (km)	Δ_MS4^(C) (au)
09-07-2019	4253196402592965504	18 45 19.24565	0.15	−06 24 13.0031	0.12	15.00	14.15	0.19	45.62
26-07-2019	4253186506987951104	18 44 07.57274	0.54	−06 26 40.1240	0.46	17.78	16.27	0.08	45.67
	4253186477047835648	18 44 06.31756	0.13	−06 26 43.8948	0.11	15.45	11.66	0.98	45.68
19-08-2019	4253181804071259648	18 42 43.51905	0.24	−06 32 34.0868	0.19	16.51	16.59	0.05	45.88
26-07-2020	4253244201379441792	18 48 18.07372	0.12	−06 13 31.6134	0.12	14.76	12.61	0.47	45.60
08-08-2020	4253248324549054464	18 47 29.96384	0.12	−06 16 31.4727	0.10	14.62	11.13	1.19	45.70
24-02-2021	4253709191700784896	18 56 35.98731	0.25	−06 30 23.1569	0.23	16.51	12.96	0.53	47.05
14-10-2021	4252495635735083264	18 50 30.76176	0.31	−06 24 13.3375	0.27	15.83	13.44	0.34	46.52
10-06-2022	4253907305577009664	19 00 15.44628	0.23	−05 42 42.9960	0.21	15.1	13.00	0.39	45.48

Notes. It is essential to mention that none of the stars have a duplicity flag in the Gaia DR3 catalog. ^(a)The magnitudes retrieved from NOMAD catalog and used in SORA to calculate the ^(b)stellar diameter (S _Diam) at the ^(c)MS4’s geocentric distance (Δ_MS4).

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