J/AJ/154/241ivo://CDS.VizieR/J/AJ/154/241doi:10.26093/cds/vizier.51540241CDSThirouin A.Sheppard S.S.2018-10-16T06:01:52Z2018-08-31T06:28:48ZCDS support team

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

cds-question@unistra.frsolar-systemasteroidsinfrared-photometryvisible-astronomyphotometrysloan-photometryImages of the Kuiper Belt object (126719) 2002 CC_249_ obtained in 2016 and 2017 using the 6.5 m Magellan-Baade Telescope and the 4.3 m Discovery Channel Telescope are presented. A light curve with a periodicity of 11.87+/-0.01 hr and a peak-to-peak amplitude of 0.79+/-0.04 mag is reported. This high amplitude double-peaked light curve can be due to a single elongated body, but it is best explained by a contact binary system from its U-/V-shaped light curve. We present a simple full-width-at-half-maximum test that can be used to determine if an object is likely a contact binary or an elongated object based on its light curve. Considering that 2002 CC_249_ is in hydrostatic equilibrium, a system with a mass ratio q_min_=0.6, and a density {rho}_min_=1 g/cm^3^, or less plausible a system with q_max_=1, and {rho}_max_=5 g/cm^3^ can interpret the light curve. Assuming a single Jacobi ellipsoid in hydrostatic equilibrium and an equatorial view, we estimate {rho}>=0.34 g/cm^3^, and a/b=2.07. Finally, we report a new color study showing that 2002 CC_249_ displays an ultra red surface characteristic of a dynamically Cold Classical trans-Neptunian object.2017AJ....154..241Thttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/241CatalogResearchIsServedByTAP VizieR generic servicerelated-toJ/A+A/380/347 : BVRI photometry of 27 Kuiper Belt Objects (Delsanti+, 2001)J/ApJ/749/10 : SDSS observations of Kuiper belt objects (Ofek, 2012)J/AJ/152/80 : Astrometry of Pluto and trans-Neptunian objects (Holman+, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/241https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/241http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/241https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/241https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/241http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/241GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapInfraredOpticaldefaultJ/AJ/154/241/table1Summary of Our ObservationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observationtime.epoch;obs;meta.mainnullableprimaryphotindicates photometric data in Table 2 at this datemeta.ref.urlcharNNumber of image(s) obtained each nightmeta.numbercharrh[38.034/38.059] Heliocentric distance r_h_ (1)AUpos.distance;pos.heliocentricfloatDelta[37.037/37.334] Geocentric distance {Delta} (1)AUpos.distance;pos.geocentricfloatalpha[0/1.1] Phase angle of the observations {alpha} (1)degpos.phaseAng;obsfloatFilter[VR g'r'i'] Filter(s) usedinstr.setup;instr.filtercharTelTelescope name (DCT, Magellan)meta.id;instr.telcharJ/AJ/154/241/table2Photometry Used in This PaperrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintDateUT date of observationtime.epoch;obsnullableJDJulian Date (1)dtime.epochdoublerelmag[-0.39/0.44] Relative magnitude (in V R or r' band, see Table 1)magphot.mag;arith.difffloate_relmag[0.02/0.19] Uncertainty in relmagmagstat.error;phot.magfloat