J/MNRAS/462/S138ivo://CDS.VizieR/J/MNRAS/462/S138doi:10.26093/cds/vizier.74629138CDSSnodgrass C.Opitom C.de Val-Borro M.Jehin E.Manfroid J.Lister T.,Marchant J.Jones G.H.Fitzsimmons A.Steele I.A.Smith R.J.,Jermak H.Granzer T.Meech K.J.Rousselot P.Levasseur-Regourd A.-C.2024-08-16T20:18:52Z2016-10-20T11:55:26ZCDS support team

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

cds-question@unistra.frcometsphotometryAround the time of its perihelion passage, the observability of 67P/Churyumov-Gerasimenko from Earth was limited to very short windows each morning from any given site, due to the low solar elongation of the comet. The peak in the comet's activity was therefore difficult to observe with conventionally scheduled telescopes, but was possible where service/queue-scheduled mode was possible, and with robotic telescopes. We describe the robotic observations that allowed us to measure the total activity of the comet around perihelion, via photometry (dust) and spectroscopy (gas), and compare these results with the measurements at this time by Rosetta's instruments. The peak of activity occurred approximately two weeks after perihelion. The total brightness (dust) largely followed the predictions from Snodgrass et al., with no significant change in total activity levels from previous apparitions. The CN gas production rate matched previous orbits near perihelion, but appeared to be relatively low later in the year.2016MNRAS.462S.138Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/MNRAS/462/S138CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/520/A92 : Comet 67P global plasma parameter simulation (Gortsas+, 2011)J/A+A/527/A113 : 67P/Churyumov-Gerasimenko R-band light curve (Tubiana+, 2011)J/A+A/548/A12 : 67P/Churyumov-Gerasimenko R-band light curve (Lowry+, 2012)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/MNRAS/462/S138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/MNRAS/462/S138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/MNRAS/462/S138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/MNRAS/462/S138https://vizier.iucaa.in/viz-bin/votable?-source=J/MNRAS/462/S138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/MNRAS/462/S138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tap2.762881831355591e-19 3.3785437584409506e-19OpticaldefaultJ/MNRAS/462/S138/table1Log of observations described in this paperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs.dateObservation date (2015-MM-DD.dd, UT time as fraction of day)time.epoch;obsnullableTelTelescope/Instrument (1)meta.notecharNexpNumber of exposuresmeta.numberintTexpExposure timestime.duration;obs.exposureintFilterFilter(s) used (2)instr.setup;instr.filtercharrHeliocentric distanceAUpos.distance;pos.heliocentricfloatDeltaGeocentric distanceAUpos.distance;pos.geocentricfloatalphaPhase angledegpos.phaseAngfloatJ/MNRAS/462/S138/tablea1R-band photometryrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintObs.dateObservation date (2015-MM-DD.dd, UT time as fraction of day)time.epoch;obsnullablerHeliocentric distanceaupos.distance;pos.heliocentricfloatDeltaTTime from periheliondtime.epochfloatRmagApparent R-band magnitudemagphot.mag;em.opt.RfloatR(r.1.0)Reduced R-band magnitude, R(r,1,0) (1)magphot.mag;em.opt.RfloatAfrhoAfrho activity measure (no phase correction)cmphysfloatTelTelescope/Instrumentmeta.notechar