J/MNRAS/454/3267ivo://CDS.VizieR/J/MNRAS/454/3267doi:10.26093/cds/vizier.74543267CDSFeng F.Bailer-Jones C.A.L.2024-08-15T20:16:08Z2016-09-23T13:22:05ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.frsolar-systemcometsThe Solar system's Oort cloud can be perturbed by the Galactic tide and by individual passing stars. These perturbations can inject Oort cloud objects into the inner parts of the Solar system, where they may be observed as the long-period comets (periods longer than 200yr). Using dynamical simulations of the Oort cloud under the perturbing effects of the tide and 61 known stellar encounters, we investigate the link between long-period comets and encounters. We find that past encounters were responsible for injecting at least 5 percent of the currently known long-period comets. This is a lower limit due to the incompleteness of known encounters. Although the Galactic tide seems to play the dominant role in producing the observed long-period comets, the non-uniform longitude distribution of the cometary perihelia suggests the existence of strong - but as yet unidentified - stellar encounters or other impulses. The strongest individual future and past encounters are probably HIP 89825 (Gliese 710) and HIP 14473, which contribute at most 8 and 6 percent to the total flux of long-period comets, respectively. Our results show that the strength of an encounter can be approximated well by a simple proxy, which will be convenient for quickly identifying significant encounters in large data sets. Our analysis also indicates a smaller population of the Oort cloud than is usually assumed, which would bring the mass of the solar nebula into line with planet formation theories.2015MNRAS.454.3267Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/454/3267CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/575/A35 : Close star encounters (Bailer-Jones, 2015)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/454/3267https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/454/3267http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/454/3267https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/454/3267https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/454/3267http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/454/3267GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/MNRAS/454/3267/table1 (List of 103 encounter object)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/MNRAS/454/3267/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/MNRAS/454/3267/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/MNRAS/454/3267/table1?GETtext/xml+votable180.050000true262.401021924.65392220.0055555555555555566/1106 1704 5420 6217 6490 8023 10370 14266 16629 18139 18821 19556 20778 20849 20940 21289 22239 22818 22849 22882 23330 23426 23731 23938 24488 24502 25513 26972 28816 28955 30255 30345 30543 30599 30999 31363 31650 31781 32470 32658 33015 33582 34612 36824 37467 38382 38551 39771 41284 41591 41763 42022 44419 45237 45879 46752 47795 48037 48188 48749https://cdsarc.cds.unistra.fr/viz-bin/moc/J/MNRAS/454/3267?format=asciidefaultJ/MNRAS/454/3267/table1List of 103 encounter objectrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintHIPHIP numbermeta.id;meta.mainintCat[DGPRX] Catalog code (1)meta.code;meta.tablecharMencMass of the encountering starsolMassphys.massfloatr_Menc? Reference to the stellar mass for the 45 most perturbing encounters (3)meta.ref;pos.frameintnullabletphTime at perihelion of the encountering starMyrtime.epochfloatVphVelocity at perihelion in the heliocentric rest frame of the encountering starkm/sphys.veloc;pos.heliocentricfloatdphPerihelion distance of the encountering starpcpos.distance;src.orbital.periastronfloatgg value (G=Menc/(d_ph_^2^*Vph))0.01solMass.pc**-2.km**-1.s**-1stat.fit.paramfloatNeNe value (Ne={eta}Menc/(d_ph_^delta^*Vph))stat.fit.paramintfmaxMaximum flux ratiophot.flux;arith.ratiofloatDTmaxTime delay between the time when encounter-induced flux reaches its maximum and the perihelion time, tphMyrtime.epoch;arith.difffloatf0Current flux ratiophot.flux;arith.ratiofloatSeq[bnr] Sequence which an object belongs to (2)meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main