J/AJ/159/8ivo://CDS.VizieR/J/AJ/159/8doi:10.26093/cds/vizier.51590008CDSVillarroel B.Soodla J.Comeron S.Mattsson L.Pelckmans K.,Lopez-Corredoira M.Krisciunas K.Guerras E.Kochukhov O.Bergstedt J.,Buelens B.Bar R.E.Cubo R.Enriquez J.E.Gupta A.C.Imaz I.,Karlsson T.Prieto M.A.Shlyapnikov A.A.de Souza R.S.Vavilova I.B.,Ward M.J.2020-08-19T13:24:30Z2020-02-20T08:46:04ZCDS support team

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

cds-question@unistra.frastrometryapparent-magnitudesurveysIn this paper we report the current status of a new research program. The primary goal of the "Vanishing and Appearing Sources during a Century of Observations" project is to search for vanishing and appearing sources using existing survey data to find examples of exceptional astrophysical transients. The implications of finding such objects extend from traditional astrophysics fields to the more exotic searches for evidence of technologically advanced civilizations. In this first paper we present new, deeper observations of the tentative candidate discovered by Villarroel et al. (2016AJ....152...76V). We then perform the first searches for vanishing objects throughout the sky by comparing 600 million objects from the US Naval Observatory Catalogue (USNO) B1.0 (Cat. I/284) down to a limiting magnitude of ~20-21 with the recent Pan-STARRS Data Release-1 (DR1, Cat. II/349) with a limiting magnitude of ~23.4. We find about 150000 preliminary candidates that do not have any Pan-STARRS counterpart within a 30" radius. We show that these objects are redder and have larger proper motions than typical USNO objects. We visually examine the images for a subset of about 24000 candidates, superseding the 2016 study with a sample 10 times larger. We find about 100 point sources visible in only one epoch in the red band of the USNO, which may be of interest in searches for strong M-dwarf flares, high-redshift supernovae, or other categories of unidentified red transients.2020AJ....159....8Vhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/159/8CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toI/284 : The USNO-B1.0 Catalog (Monet+, 2003)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers, 2016)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/159/8https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/159/8http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/159/8https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/159/8https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/159/8http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/159/8GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/159/8/table2 (Coordinates (J2000.0) of the first set of ~100 surviving candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/8/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/8/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/8/table2?GETtext/xml+votable180.050000true2.8309583-3.16256110.005555555555555556Cone search capability for table J/AJ/159/8/table3 (The most interesting candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/159/8/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/159/8/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/159/8/table3?GETtext/xml+votable180.050000true4.028833321.979950.0055555555555555566/695 4396 4409 4425 4447 4473 4555 4841 5132 5158 5166 5412 5634 5677 5874 6133 6452 6530 7358 7391 7392 7403 7406 7416 7511 8125 8276 8674 8713 8946 8953 9024 9141 9421 9667 9798 9885 10315 10501 10607 10903 10909 11248 11317 11505 11512 11547 11570 11652 11761 11912 11949 14994 16291 17375 17913 17944 18126 18264 18275 19473 19721 19809 19851 19898 19962 23276 23357 23418 26245 26343 26374 26445 26481 26566 26608 27003 27077 27092 27095 27127 27132 27626 27628 27642 27815 27887 27937 27954 27983 28035 28062 28149 28202 28288 28298 28308 28335 36859https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/159/8?format=asciidefaultJ/AJ/159/8/table2Coordinates (J2000.0) of the first set of ~100 surviving candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainrmag[13.57/19.49] r band magnitude (1)magphot.mag;em.opt.RfloatJ/AJ/159/8/table3The most interesting candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Hour of Right Ascension (J2000) (1)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000) (1)pos.eq.dec;meta.main