URAT South Parallax Results
- U.S. Naval Observatory, Washington DC 20392-5420 (United States)
- Georgia State University, Atlanta, GA 30302-4106 (United States)
We present 916 trigonometric parallaxes and proper motions of newly discovered nearby stars from the United States Naval Observatory Robotic Astrometric Telescope (URAT). Observations were taken at the Cerro Tololo Interamerican Observatory over a 2-year period from 2015 to 2017 October covering the entire sky south of about +25° decl. SPM4 and UCAC4 early epoch catalog data were added to extend the temporal coverage for the parallax and proper motion fit up to 48 years. Using these new URAT parallaxes, optical and near-IR photometry from the AAVSO Photometric All-Sky Survey and Two Micron All-Sky Survey catalogs, we identify possible new nearby dwarfs, young stars, low-metallicity subdwarfs and white dwarfs. Comparison to known trigonometric parallaxes shows a high quality of the URAT-based results confirming the error in parallax of the URAT south parallaxes reported here to be between 2 and 13 mas. We also include additional 729 trigonometric parallaxes from the URAT north 25 pc sample published in Finch and Zacharias here after applying the same criterion as for the southern sample to have a complete URAT 25 pc sample presented in this paper.
- OSTI ID:
- 22897437
- Journal Information:
- Astronomical Journal (New York, N.Y. Online), Vol. 155, Issue 4; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
- Country of Publication:
- United States
- Language:
- English
Similar Records
UCAC4 nearby star survey: A search for our stellar neighbors
THE SOLAR NEIGHBORHOOD. XXII. PARALLAX RESULTS FROM THE CTIOPI 0.9 m PROGRAM: TRIGONOMETRIC PARALLAXES OF 64 NEARBY SYSTEMS WITH 0.''5 {<=}{mu}{<=} 1.''0 yr{sup -1} (SLOWMO SAMPLE)