C/2014 UN271(Bernardinelli-Bernstein): The Nearly Spherical Cow of Comets

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Autor(es): dc.contributorUniversity of Pennsylvania-
Autor(es): dc.contributorUniversity of New South Wales-
Autor(es): dc.contributorUniversity of Western Ontario-
Autor(es): dc.contributorUniversity of Hawaii-
Autor(es): dc.contributorLaboratório Interinstitucional de E-Astronomia - LIneA-
Autor(es): dc.contributorFermi National Accelerator Laboratory-
Autor(es): dc.contributorUniversidade Estadual Paulista (UNESP)-
Autor(es): dc.contributorUniversidad Autonoma de Madrid-
Autor(es): dc.contributorInstitut d'Astrophysique de Paris-
Autor(es): dc.contributorUniversity College London-
Autor(es): dc.contributorStanford University-
Autor(es): dc.contributorSLAC National Accelerator Laboratory-
Autor(es): dc.contributorNational Center for Supercomputing Applications-
Autor(es): dc.contributorUniversity of Illinois at Urbana-Champaign-
Autor(es): dc.contributorBarcelona Institute of Science and Technology-
Autor(es): dc.contributorUniversity of Wisconsin-Madison-
Autor(es): dc.contributorUniversity of Manchester-
Autor(es): dc.contributorSchool of Physics and Astronomy-
Autor(es): dc.contributorUniversity of Trieste-
Autor(es): dc.contributorINAF-Osservatorio Astronomico di Trieste-
Autor(es): dc.contributorInstitute for Fundamental Physics of the Universe-
Autor(es): dc.contributorObservatório Nacional-
Autor(es): dc.contributorUniversity of Michigan-
Autor(es): dc.contributorUniversitat Hamburg-
Autor(es): dc.contributorMedioambientales y Tecnológicas (CIEMAT)-
Autor(es): dc.contributorSanta Cruz Institute for Particle Physics-
Autor(es): dc.contributorUniversity of Oslo-
Autor(es): dc.contributorUniversity of Chicago-
Autor(es): dc.contributorInstitut d'Estudis Espacials de Catalunya (IEEC)-
Autor(es): dc.contributorInstitute of Space Sciences (ICE CSIC)-
Autor(es): dc.contributorLudwig-Maximilians-Universitat-
Autor(es): dc.contributorUniversity of Queensland-
Autor(es): dc.contributorOhio State University-
Autor(es): dc.contributorCenter for Astrophysics | Harvard and Smithsonian-
Autor(es): dc.contributorMacquarie University-
Autor(es): dc.contributorLowell Observatory-
Autor(es): dc.contributorTexas A and M University-
Autor(es): dc.contributorInstitució Catalana de Recerca i Estudis Avancats-
Autor(es): dc.contributorUniversity of Cambridge-
Autor(es): dc.contributorPeyton Hall-
Autor(es): dc.contributorUniversity of Sussex-
Autor(es): dc.contributorUniversity of Southampton-
Autor(es): dc.contributorOak Ridge National Laboratory-
Autor(es): dc.contributor382 Via Pueblo Mall-
Autor(es): dc.contributorDuke University-
Autor(es): dc.contributorMax Planck Institute for Extraterrestrial Physics-
Autor(es): dc.contributorLudwig-Maximilians Universitat München-
Autor(es): dc.contributorNSF's National Optical-Infrared Astronomy Research Laboratory-
Autor(es): dc.creatorBernardinelli, Pedro H.-
Autor(es): dc.creatorBernstein, Gary M.-
Autor(es): dc.creatorMontet, Benjamin T.-
Autor(es): dc.creatorWeryk, Robert-
Autor(es): dc.creatorWainscoat, Richard-
Autor(es): dc.creatorAguena, M.-
Autor(es): dc.creatorAllam, S.-
Autor(es): dc.creatorAndrade-Oliveira, F.-
Autor(es): dc.creatorAnnis, J.-
Autor(es): dc.creatorAvila, S.-
Autor(es): dc.creatorBertin, E.-
Autor(es): dc.creatorBrooks, D.-
Autor(es): dc.creatorBurke, D. L.-
Autor(es): dc.creatorCarnero Rosell, A.-
Autor(es): dc.creatorKind, M. Carrasco-
Autor(es): dc.creatorCarretero, J.-
Autor(es): dc.creatorCawthon, R.-
Autor(es): dc.creatorConselice, C.-
Autor(es): dc.creatorCostanzi, M.-
Autor(es): dc.creatorDa Costa, L. N.-
Autor(es): dc.creatorPereira, M. E.S.-
Autor(es): dc.creatorDe Vicente, J.-
Autor(es): dc.creatorDiehl, H. T.-
Autor(es): dc.creatorEverett, S.-
Autor(es): dc.creatorFerrero, I.-
Autor(es): dc.creatorFlaugher, B.-
Autor(es): dc.creatorFrieman, J.-
Autor(es): dc.creatorGarcía-Bellido, J.-
Autor(es): dc.creatorGaztanaga, E.-
Autor(es): dc.creatorGerdes, D. W.-
Autor(es): dc.creatorGruen, D.-
Autor(es): dc.creatorGruendl, R. A.-
Autor(es): dc.creatorGschwend, J.-
Autor(es): dc.creatorGutierrez, G.-
Autor(es): dc.creatorHinton, S. R.-
Autor(es): dc.creatorHollowood, D. L.-
Autor(es): dc.creatorHonscheid, K.-
Autor(es): dc.creatorJames, D. J.-
Autor(es): dc.creatorKuehn, K.-
Autor(es): dc.creatorKuropatkin, N.-
Autor(es): dc.creatorLahav, O.-
Autor(es): dc.creatorMaia, M. A.G.-
Autor(es): dc.creatorMarshall, J. L.-
Autor(es): dc.creatorMenanteau, F.-
Autor(es): dc.creatorMiquel, R.-
Autor(es): dc.creatorMorgan, R.-
Autor(es): dc.creatorOgando, R. L.C.-
Autor(es): dc.creatorPaz-Chinchón, F.-
Autor(es): dc.creatorPieres, A.-
Autor(es): dc.creatorMalagón, A. A. Plazas-
Autor(es): dc.creatorRodriguez-Monroy, M.-
Autor(es): dc.creatorRomer, A. K.-
Autor(es): dc.creatorRoodman, A.-
Autor(es): dc.creatorSanchez, E.-
Autor(es): dc.creatorSchubnell, M.-
Autor(es): dc.creatorSerrano, S.-
Autor(es): dc.creatorSevilla-Noarbe, I.-
Autor(es): dc.creatorSmith, M.-
Autor(es): dc.creatorSoares-Santos, M.-
Autor(es): dc.creatorSuchyta, E.-
Autor(es): dc.creatorSwanson, M. E.C.-
Autor(es): dc.creatorTarle, G.-
Autor(es): dc.creatorTo, C.-
Autor(es): dc.creatorTroxel, M. A.-
Autor(es): dc.creatorVarga, T. N.-
Autor(es): dc.creatorWalker, A. R.-
Autor(es): dc.creatorZhang, Y.-
Data de aceite: dc.date.accessioned2025-08-21T16:13:34Z-
Data de disponibilização: dc.date.available2025-08-21T16:13:34Z-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2022-04-29-
Data de envio: dc.date.issued2021-11-09-
Fonte completa do material: dc.identifierhttp://dx.doi.org/10.3847/2041-8213/ac32d3-
Fonte completa do material: dc.identifierhttp://hdl.handle.net/11449/230009-
Fonte: dc.identifier.urihttp://educapes.capes.gov.br/handle/11449/230009-
Descrição: dc.descriptionComet C/2014 UN271 (Bernardinelli-Bernstein), incoming from the Oort cloud, is remarkable in having the brightest (and presumably largest) nucleus of any well-measured comet and having been discovered at the heliocentric distance r h ≈ 29 au, farther than any Oort cloud comet. In this work, we describe the discovery process and observations and the properties that can be inferred from images recorded until the first reports of activity in 2021 June. The orbit has i = 95°, with a perihelion of 10.97 au to be reached in 2031 and a previous aphelion at 40,400 ± 260 au. Backward integration of the orbit under a standard Galactic tidal model and known stellar encounters suggests a perihelion of q ≈ 18 au on its previous perihelion passage 3.5 Myr ago; hence, the current data could be the first ever obtained of a comet that has not been inside Uranus's orbit in 4 Gyr. The photometric data show an unresolved nucleus with absolute magnitude H r = 8.0, colors that are typical of comet nuclei or Damocloids, and no secular trend as it traversed the range 34-23 au. For the r-band geometric albedo p r , this implies a diameter of km. There is strong evidence of brightness fluctuations at the ±0.2 mag level, but no rotation period can be discerned. A coma, nominally consistent with a stationary1/ρ surface brightness distribution, grew in scattering cross section at an exponential rate from A f ρ ≈ 1 to ≈150 m as the comet approached from 28 to 20 au. The activity rate is consistent with a very simple model of sublimation of a surface species in radiative equilibrium with the Sun. The inferred enthalpy of sublimation matches those of CO2 and NH3. More volatile species, such as N2, CH4, and CO, must be far less abundant on the sublimating surfaces.-
Descrição: dc.descriptionDepartment of Physics and Astronomy University of Pennsylvania-
Descrição: dc.descriptionSchool of Physics University of New South Wales-
Descrição: dc.descriptionUNSW Data Science Hub University of New South Wales-
Descrição: dc.descriptionDepartment of Physics and Astronomy University of Western Ontario, 1151 Richmond Street-
Descrição: dc.descriptionInstitute for Astronomy University of Hawaii, 2680 Woodlawn Drive-
Descrição: dc.descriptionLaboratório Interinstitucional de E-Astronomia - LIneA, Rua Gal. José Cristino 77, RJ-
Descrição: dc.descriptionFermi National Accelerator Laboratory, P.O. Box 500-
Descrição: dc.descriptionInstituto de Física Teórica Universidade Estadual Paulista-
Descrição: dc.descriptionInstituto de Fisica Teorica UAM/CSIC Universidad Autonoma de Madrid-
Descrição: dc.descriptionCNRS UMR 7095 Institut d'Astrophysique de Paris-
Descrição: dc.descriptionSorbonne Universités UPMC Univ Paris 06 UMR 7095 Institut d'Astrophysique de Paris-
Descrição: dc.descriptionDepartment of Physics and Astronomy University College London, Gower Street-
Descrição: dc.descriptionKavli Institute for Particle Astrophysics and Cosmology Stanford University, P.O. Box 2450-
Descrição: dc.descriptionSLAC National Accelerator Laboratory-
Descrição: dc.descriptionCenter for Astrophysical Surveys National Center for Supercomputing Applications, 1205 West Clark Street-
Descrição: dc.descriptionDepartment of Astronomy University of Illinois at Urbana-Champaign, 1002 West Green Street-
Descrição: dc.descriptionInstitut de Física d'Altes Energies (IFAE) Barcelona Institute of Science and Technology Campus UAB, Bellaterra-
Descrição: dc.descriptionPhysics Department 2320 Chamberlin Hall University of Wisconsin-Madison, 1150 University Avenue-
Descrição: dc.descriptionJodrell Bank Center for Astrophysics School of Physics and Astronomy University of Manchester, Oxford Road-
Descrição: dc.descriptionUniversity of Nottingham School of Physics and Astronomy-
Descrição: dc.descriptionAstronomy Unit Department of Physics University of Trieste, via Tiepolo 11-
Descrição: dc.descriptionINAF-Osservatorio Astronomico di Trieste, via G.B. Tiepolo 11-
Descrição: dc.descriptionInstitute for Fundamental Physics of the Universe, Via Beirut 2-
Descrição: dc.descriptionObservatório Nacional, Rua Gal. José Cristino 77, RJ-
Descrição: dc.descriptionDepartment of Physics University of Michigan-
Descrição: dc.descriptionHamburger Sternwarte Universitat Hamburg, Gojenbergsweg 112-
Descrição: dc.descriptionCentro de Investigaciones Energéticas Medioambientales y Tecnológicas (CIEMAT)-
Descrição: dc.descriptionSanta Cruz Institute for Particle Physics-
Descrição: dc.descriptionInstitute of Theoretical Astrophysics University of Oslo, P.O. Box 1029 Blindern-
Descrição: dc.descriptionKavli Institute for Cosmological Physics University of Chicago-
Descrição: dc.descriptionInstitut d'Estudis Espacials de Catalunya (IEEC)-
Descrição: dc.descriptionInstitute of Space Sciences (ICE CSIC) Campus UAB, Carrer de Can Magrans, s/n-
Descrição: dc.descriptionDepartment of Astronomy University of Michigan-
Descrição: dc.descriptionFaculty of Physics Ludwig-Maximilians-Universitat, Scheinerstr. 1-
Descrição: dc.descriptionSchool of Mathematics and Physics University of Queensland-
Descrição: dc.descriptionCenter for Cosmology and Astro-Particle Physics Ohio State University-
Descrição: dc.descriptionDepartment of Physics Ohio State University-
Descrição: dc.descriptionCenter for Astrophysics | Harvard and Smithsonian, 60 Garden Street-
Descrição: dc.descriptionAustralian Astronomical Optics Macquarie University-
Descrição: dc.descriptionLowell Observatory, 1400 Mars Hill Road-
Descrição: dc.descriptionGeorge P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy Department of Physics and Astronomy Texas A and M University-
Descrição: dc.descriptionInstitució Catalana de Recerca i Estudis Avancats-
Descrição: dc.descriptionInstitute of Astronomy University of Cambridge, Madingley Road-
Descrição: dc.descriptionDepartment of Astrophysical Sciences Princeton University Peyton Hall-
Descrição: dc.descriptionDepartment of Physics and Astronomy Pevensey Building University of Sussex-
Descrição: dc.descriptionSchool of Physics and Astronomy University of Southampton-
Descrição: dc.descriptionComputer Science and Mathematics Division Oak Ridge National Laboratory-
Descrição: dc.descriptionDepartment of Physics Stanford University 382 Via Pueblo Mall-
Descrição: dc.descriptionDepartment of Physics Duke University-
Descrição: dc.descriptionMax Planck Institute for Extraterrestrial Physics, Giessenbachstrasse-
Descrição: dc.descriptionUniversitats-Sternwarte Fakultat für Physik Ludwig-Maximilians Universitat München, Scheinerstr. 1-
Descrição: dc.descriptionCerro Tololo Inter-American Observatory NSF's National Optical-Infrared Astronomy Research Laboratory, Casilla 603-
Descrição: dc.descriptionInstituto de Física Teórica Universidade Estadual Paulista-
Idioma: dc.languageen-
Relação: dc.relationAstrophysical Journal Letters-
???dc.source???: dc.sourceScopus-
Título: dc.titleC/2014 UN271(Bernardinelli-Bernstein): The Nearly Spherical Cow of Comets-
Tipo de arquivo: dc.typelivro digital-
Aparece nas coleções:Repositório Institucional - Unesp

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