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Table 2

14 stars that encounter 2I/Borisov in the past with a median encounter distance () below 1 pc, sorted by this value.

Name Gaia DR2 source ID tenc [kyr] denc [pc] venc [km s−1] ϖ σ(ϖ) μ σ(μ) vr σ(vr) G MG BP-RP
med 5% 95% med 5% 95% med 5% 95% mas mas yr−1 km s−1 mag mag mag
Ross 573 5162123155863791744 −909 −937 −882 0.068 0.053 0.091 22.6 22.0 23.3 47.57 0.03 309.22 0.09 13.1 0.4 9.33 7.72 1.80
GJ 4384 (a) 2875096978193873024 −1523 −1550 −1496 0.250 0.218 0.286 19.1 18.7 19.4 33.74 0.04 126.27 0.06 −7.9 0.2 6.32 3.96 0.69
GJ 3270 (b) 3299381442858615936 −444 −559 −365 0.459 0.377 0.580 32.1 25.5 39.0 68.58 0.08 400.33 0.17 14.0 4.0 12.25 11.43 3.13
HD 44867 3368960531532018816 −1424 −1450 −1396 0.572 0.360 1.128 85.9 85.6 86.2 8.00 0.09 48.61 0.11 71.2 0.2 6.04 0.56 1.20
3338543951096093696 −2876 −2930 −2827 0.588 0.162 1.244 36.9 36.3 37.5 9.21 0.04 55.30 0.08 21.4 0.4 10.46 5.28 0.99
Wolf 28 (c) 2552928187080872832 −14.7 −15.1 −14.3 0.647 0.629 0.668 284.0 275.4 292.3 231.77 0.04 2978.29 0.10 263.0 4.9 12.31 14.14 0.61
4828141619844398464 −2401 −2507 −2301 0.675 0.559 0.824 64.5 61.7 67.2 6.35 0.02 39.52 0.04 77.2 1.7 12.99 7.00 1.37
GJ 1103A 3085716990368639744 −95 −105 −86 0.698 0.634 0.778 95.7 86.0 105.0 107.80 0.09 801.48 0.17 93.8 5.7 11.66 11.82 3.12
GJ 2070 3073508528645520000 −402 −579 −307 0.809 0.615 1.172 32.5 22.5 42.6 74.67 0.07 479.02 0.12 34.9 6.2 11.51 10.87 2.60
GJ 873 (d) 1934263333784036736 −177 −178 −176 0.818 0.813 0.823 27.6 27.4 27.7 198.04 0.04 842.10 0.09 0.4 0.1 9.00 10.48 2.73
6743117625594496512 −1750 −1783 −1718 0.835 0.496 1.220 69.8 68.6 70.9 8.00 0.04 43.84 0.10 89.6 0.7 10.41 4.93 0.95
HD 277756 207166446152692736 −1283 −1297 −1269 0.859 0.799 0.924 35.3 35.0 35.7 21.58 0.06 81.70 0.10 8.3 0.2 9.05 5.72 0.99
HIP 34498 978301126629450368 −5283 −5354 −5211 0.944 0.487 1.770 25.1 24.8 25.3 7.40 0.04 33.68 0.10 1.0 0.1 8.97 3.32 0.96
HD 22781 217334764042444288 −889 −900 −878 0.969 0.900 1.034 35.8 35.4 36.2 30.67 0.11 102.62 0.18 8.3 0.2 8.52 5.96 1.08

Notes. Column 1 reports a common name (Ross, Wolf, GJ, HD, HIP, in that order) from Simbad, if available (Gaia DR2 4828141619844398464 has no entry in Simbad). Columns 3, 6, and 9 are the median encounter time , median encounter distance , and median encounter velocity , respectively. The columns labeled 5% and 95% are the bounds of the corresponding 90% confidence intervals. Columns 12–17 list the parallax (ϖ; corrected for the zeropoint), total proper motion (μ), and radial velocity (vr) along with their 1σ uncertainties. Columns 18, 19, and 20 are the apparent and absolute Gaia G-band magnitude (assuming zero extinction) and Gaia color respectively. As discussed in Sect. 3.2, GJ 4384 is probably in a long-period binary orbit, so the encounter parameters shown here (which neglect this) are incorrect. (a) = HD 224635? (see text), (b) = G 7-34, (c) = van Maanen’s star, (d) = V* EV Lac.

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