Zobrazeno 1 - 10
of 98
pro vyhledávání: '"Zacharias, Norbert"'
Autor:
Zacharias, Norbert, Makarov, Valeri V., Finch, Charles T., Harris, Hugh C., Munn, Jeffrey A., Subasavage, John P.
USNO Bright Star Catalog (UBSC) is a new astrometric catalog of 1423 brightest stars covering the entire sky, which is published online. It is nearly complete to $V=3$ mag except for three stellar systems. A combined astrometric solution of the Hippa
Externí odkaz:
http://arxiv.org/abs/2204.09080
The USNO ground-based astrometric program URAT-Bright in combination with the Hipparcos mission epoch astrometry provides precise proper motions of a thousand bright stars in the southern hemisphere on a time basis of about 25 years. Small but statis
Externí odkaz:
http://arxiv.org/abs/2107.01090
We use a combination of Hipparcos space mission data with the USNO dedicated ground-based astrometric program URAT-Bright designed to complement and verify Gaia results for the brightest stars in the south to estimate the small perturbations of obser
Externí odkaz:
http://arxiv.org/abs/2105.03244
Autor:
Fischer, Travis C., Secrest, Nathan J., Johnson, Megan C., Dorland, Bryan N., Cigan, Phillip J., Fernandez, Luis C., Hunt, Lucas R., Koss, Michael, Schmitt, Henrique R., Zacharias, Norbert
We present the first results from the Fundamental Reference AGN Monitoring Experiment (FRAMEx), an observational campaign dedicated to understanding the physical processes that affect the apparent positions and morphologies of AGNs. In this work, we
Externí odkaz:
http://arxiv.org/abs/2011.06570
We present 916 trigonometric parallaxes and proper motions of newly discovered nearby stars from the United States Naval Observatory (USNO) Robotic Astrometric Telescope (URAT). Observations were taken at the Cerro Tololo Interamerican Observatory (C
Externí odkaz:
http://arxiv.org/abs/1802.08272
New astrometric reductions of the US Naval Observatory CCD Astrograph Catalog (UCAC) all-sky observations were performed from first principles using the TGAS stars in the 8 to 11 magnitude range as reference star catalog. Significant improvements in
Externí odkaz:
http://arxiv.org/abs/1702.05621
Autor:
Finch, Charlie, Zacharias, Norbert
The URAT Parallax Catalog (UPC) consists of 112,177 parallaxes. The catalog utilizes all Northern Hemisphere exposures from the United States Naval Observatory (USNO) Robotic Astrometric Telescope (URAT) obtained between April 2012 and June 2015. Rel
Externí odkaz:
http://arxiv.org/abs/1604.06739
Autor:
Finch, Charlie, Zacharias, Norbert
We present 1103 trigonometric parallaxes and proper motions from the United States Naval Observatory (USNO) Robotic Astrometric Telescope (URAT) observations taken at the Naval Observatory Flagstaff Station (NOFS) over a 3 year period from April 2012
Externí odkaz:
http://arxiv.org/abs/1603.05674
Autor:
Zacharias, Norbert
Commission 8 has regularly published triennial reports in the past and the current OC therefore voted to adopt a traditional format also for this special Legacy issue of the IAU Transactions. The outgoing President is grateful for the support of many
Externí odkaz:
http://arxiv.org/abs/1512.07147
Autor:
Secrest, Nathan, Dudik, Rachel, Dorland, Bryan, Zacharias, Norbert, Makarov, Valeri, Fey, Alan, Frouard, Julien, Finch, Charlie
We present an all-sky sample of ~ 1.4 million AGNs meeting a two color infrared photometric selection criteria for AGNs as applied to sources from the Wide-Field Infrared Survey Explorer final catalog release (AllWISE). We assess the spatial distribu
Externí odkaz:
http://arxiv.org/abs/1509.07289