The interstellar flux gap: From dust to kilometer-scale objects

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Table A.1.

Properties of candidate interstellar meteoroids and confirmed ISOs.

Type	Event	e	i [deg]	q [AU]	V_∞ [km s⁻¹]	α_g [deg]	δ_g [deg]	σ_hyper
Radar meteor	2014-268-1026	1.12	16.6	0.26	21	100.3	14.3	3.78
		[0.03]	[1.2]	[0.02]	[2]	[1.4]	[0.7]
Radar meteor	2015-008-1D0C	1.16	28.2	0.998	13	192	85.2	3.33
		[0.05]	[0.8]	[0.0]	[2]	[9]	[1.0]
Radar meteor	2014-004-0805	1.17	67	0.34	22	196.8	-38	3.33
		[0.05]	[3]	[0.04]	[2]	[0.8]	[2]
Radar meteor	2017-283-2484	1.12	22	0.289	21	115.4	9.1	3.51
		[0.04]	[2]	[0.010]	[3]	[0.6]	[1.3]
Radar meteor	2014-299-0152	1.11	14.8	0.227	22	136.8	23.8	3.19
		[0.04]	[1.3]	[0.012]	[3]	[1.2]	[0.6]
Optical meteor	EN200117_032343	1.034	150.58	0.9378	9.6	220.94	1.95	2.50
		[0.014]	[0.07]	[0.0009]	[0.7]	[0.07]	[0.02]
Optical meteor	EN220117_044857	1.007	146.22	0.717	8.2	234.16	-1.44	0.61
		[0.011]	[0.08]	[0.002]	[0.8]	[0.02]	[0.03]
Optical meteor	EN270117_041236	1.03	120.8	0.819	9.7	208.90	22.75	1.86
		[0.02]	[0.2]	[0.002]	[1.0]	[0.05]	[0.06]
Optical meteor	EN280117_011703	1.04	105.9	0.98410	10	231.54	27.6	1.17
		[0.04]	[0.4]	[0.00010]	[2]	[0.04]	[0.2]
Optical meteor	EN220717_215951	1.00	121.3	0.9842	2	20.86	46.3	0.14
		[0.02]	[0.2]	[0.0008]	[3]	[0.12]	[0.2]
Optical meteor	EN150817_005021	1.009	168.04	0.560	4.8	23.18	15.69	2.14
		[0.004]	[0.10]	[0.002]	[0.7]	[0.04]	[0.05]
Optical meteor	EN200917_182805	1.009	147.92	0.7339	5.8	63.05	38.079	1.54
		[0.006]	[0.03]	[0.0011]	[0.6]	[0.02]	[0.008]
Optical meteor	EN280917_231320	1.00	138.8	0.859	5.3	78.24	45.89	0.08
		[0.02]	[0.2]	[0.002]	[1.5]	[0.08]	[0.09]
Optical meteor	EN171017_024843	1.04	167.38	0.803	8.7	99.514	29.996	2.29
		[0.02]	[0.03]	[0.002]	[1.0]	[0.005]	[0.007]
Optical meteor	EN011117_003335	1.014	117.62	0.9317	7.5	159.78	47.75	1.21
		[0.011]	[0.09]	[0.0006]	[0.7]	[0.06]	[0.02]
Optical meteor	EN121117_034640	1.004	127.60	0.8952	7.2	121.77	-10.14	1.06
		[0.004]	[0.06]	[0.0005]	[0.2]	[0.03]	[0.04]
Optical meteor	EN271117_012837	1.048	151.07	0.9140	10.0	159.89	-9.36	5.64
		[0.009]	[0.14]	[0.0007]	[0.4]	[0.04]	[0.09]
Optical meteor	EN121217_001715	1.012	59.4	0.3894	9.2	114.23	53.91	2.97
		[0.004]	[0.2]	[0.0005]	[0.5]	[0.07]	[0.02]
Optical meteor	EN120918_222017	1.012	109.44	0.99880	5.5	81.51	65.42	1.06
		[0.012]	[0.09]	[0.00010]	[0.9]	[0.04]	[0.02]
Optical meteor	EN150918_005203	1.007	91.00	0.574	5.5	19.86	50.05	1.08
		[0.006]	[0.14]	[0.002]	[0.8]	[0.04]	[0.04]
Optical meteor	EN190918_213159	1.028	158.83	0.497	8.6	54.47	29.120	3.72
		[0.008]	[0.06]	[0.003]	[0.8]	[0.02]	[0.013]
Optical meteor	EN290918_223439	1.018	116.06	0.727	7.0	61.91	54.26	1.62
		[0.011]	[0.13]	[0.002]	[1.0]	[0.04]	[0.02]
Optical meteor	EN141218_032548	1.018	151.10	0.9037	8.7	169.55	22.36	1.70
		[0.011]	[0.05]	[0.0006]	[0.6]	[0.02]	[0.02]
Kilomete scale	1I/‘Oumuamua	1.20113	122.7417	0.255912	26.4053	280.50	34.30	∼10⁴
		[0.00002]	[0.0003]	[0.000007]	[0.0010]	[0.08]	[0.08]
Kilomete scale	2I/Borisov	3.35648	44.05264	2.006521	32.27771	32.7894	59.44010	∼10⁵
		[0.00002]	[0.00002]	[0.000003]	[0.00011]	[0.0002]	[0.00010]
Kilomete scale	3I/ATLAS	6.141	175.1132	1.3566	57.982	295.043	-19.0704	∼10³
		[0.002]	[0.0002]	[0.0003]	[0.005]	[0.004]	[0.0006]

Notes. The five radar meteors from Froncisz et al. 2020 and the optical fireballs from Borovička et al. 2022 are shown alongside 1I/‘Oumuamua, 2I/Borisov and 3I/ATLAS, obtained from JPL-Horizons 2025a,b,c. Displayed parameters are eccentricity, inclination, perihelion distance, heliocentric hyperbolic excess velocity (computed using the vis-viva equation), geocentric equatorial radiant, and hyperbolic significance.

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