2020A&A...634A..14B


Query : 2020A&A...634A..14B

2020A&A...634A..14B - Astronomy and Astrophysics, volume 634A, 14-14 (2020/2-1)

A search for the origin of the interstellar comet 2I/Borisov.

BAILER-JONES C.A.L., FARNOCCHIA D., YE Q., MEECH K.J. and MICHELI M.

Abstract (from CDS):

The discovery of the second interstellar object 2I/Borisov on 2019 August 30 raises the question of whether it was ejected recently from a nearby stellar system. Here we compute the asymptotic incoming trajectory of 2I/Borisov, based on both recent and pre-discovery data extending back to December 2018, using a range of force models that account for cometary outgassing. From Gaia DR2 astrometry and radial velocities, we trace back in time the Galactic orbits of 7.4 million stars to look for close encounters with 2I/Borisov. The closest encounter we find took place 910kyr ago with the M0V star Ross 573, at a separation of 0.068pc (90% confidence interval of 0.053-0.091pc) with a relative velocity of 23km/s. This encounter is nine times closer than the closest past encounter identified for the first interstellar object 1I/'Oumuamua. Ejection of 2I/Borisov via a three-body encounter in a binary or planetary system is possible, although such a large ejection velocity is unlikely to be obtained and Ross 573 shows no signs of binarity. We also identify and discuss some other recent close encounters, recognizing that if 2I/Borisov is more than about 10Myr old, our search would be unlikely to find its parent system.

Abstract Copyright: © C. A. L. Bailer-Jones et al. 2020

Journal keyword(s): astrometry - stars: kinematics and dynamics - comets: individual: 2I/Borisov - solar neighborhood

Simbad objects: 20

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Number of rows : 20
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 Wolf 28 WD* 00 49 09.8983373329 +05 23 18.993828947 12.984 12.92 12.374 12.106 11.854 DZ7.5 230 0
2 BD+39 391 PM* 01 43 57.0975034992 +40 42 49.618016352   10.86 9.88     G8V 3 0
3 BD-12 662 PM* 03 29 19.7918590731 -11 40 42.125381784 12.692 11.415 9.991 9.116 8.287 dK7 57 0
4 HD 22781 PM* 03 40 49.5243423552 +31 49 34.652692848   9.628 8.766 8.45   K0 40 1
5 UCAC4 183-003732 * 03 54 48.1017419136 -53 27 32.842286784   14.420 13.384 13.092   ~ 1 0
6 2MASS J03552337+1133437 BD* 03 55 23.3735910810 +11 33 43.797034332           L5gamma 98 0
7 G 7-34 Er* 04 17 18.5336543303 +08 49 22.015096328   15.6 13.84 12.50 10.75 M5V 46 0
8 HD 34327 PM* 05 13 27.9028615296 -55 34 08.025217896   7.73 7.10     G2V 42 0
9 HD 277756 PM* 05 15 25.2197074224 +41 54 51.898699620   10.09 9.25     G5 5 0
10 TYC 704-1967-1 PM* 05 23 05.6280924384 +09 41 23.314183368   11.48 10.51     ~ 2 0
11 HD 44867 * 06 24 52.7706689088 +16 03 25.666514856   7.39 6.35     G9III 28 0
12 BD+49 1596 * 07 08 53.3329462776 +48 52 09.763554576   10.02 9.15     K0 14 0
13 G 112-50 PM* 07 51 54.6712965202 -00 00 12.259020776 15.86 14.95 13.26 11.9 10.17 M4.5V 48 0
14 G 113-46 PM* 08 34 25.8854398510 -01 08 39.553080500   14.35 12.711 12.416   M3 28 0
15 TYC 7422-873-1 * 19 11 16.1912916456 -36 11 58.875029340   11.45 10.64     ~ 1 0
16 HD 239960A PM* 22 27 59.5575482946 +57 41 42.080559778   11.82 11.41     M3V 26 0
17 V* EV Lac Er* 22 46 49.7312610268 +44 20 02.374381562   11.85 10.26 9.89   M4.0V 847 2
18 HD 224636 PM* 23 59 29.2053206568 +33 43 27.658692408   7.21 6.66     G1 82 0
19 HD 224635 PM* 23 59 29.2916810904 +33 43 25.879935252 6.350 6.91 6.40     F8 113 0
20 BD+32 4747 ** 23 59 29.29215 +33 43 25.8887       6.76   G8+G1 59 0

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2022.05.28-10:34:51

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