/ftp/cats/I/339



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I/339                  Hot Stuff for One Year (HSOY)            (Altmann+, 2017)
The following files can be converted to FITS (extension .fit or fit.gz)
	hsoy.sam
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Query from: http://vizier.cds.unistra.fr/viz-bin/VizieR?-source=I/339
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drwxr-xr-x 317 cats archive 8192 Feb 28 11:16 [Up] drwxr-xr-x 4 cats archive 4096 Dec 19 22:48 [TAR file] -rw-r--r-- 1 cats archive 458 Dec 19 16:52 .message -r--r--r-- 1 cats archive 7517 Apr 6 2017 ReadMe -rw-r--r-- 1 cats archive 1005 Dec 19 16:52 +footg5.gif -rw-r--r-- 1 cats archive 2978 Dec 19 16:52 +footg8.gif -rw-r--r-- 1 cats archive 7250 Aug 30 2023 : -r--r--r-- 1 cats archive 225048 Mar 24 2017 hsoy.sam -rw-r--r-- 1 cats archive 990720 Aug 22 2022 tab_1339_1_I_339_hsoy.moc.fits
Beginning of ReadMe : I/339 Hot Stuff for One Year (HSOY) (Altmann+, 2017) ================================================================================ Hot Stuff for One Year (HSOY). A 583 million star proper motion catalogue derived from Gaia DR1 and PPMXL. Altmann M., Roeser S., Demleitner M., Bastian U., Schilbach E. <Astron. Astrophys. 600, L4 (2017)> =2017A&A...600L...4A ================================================================================ ADC_Keywords: Milky Way ; Positional data ; Proper motions ; Photometry Keywords: astrometry - catalogs - Galaxy: kinematics and dynamics - proper motions Abstract: Recently, the first installment of data from ESA's Gaia astrometric satellite mission (Gaia DR1) was released, containing positions of more than 1 billion stars with unprecedented precision, as well as proper motions and parallaxes, however only for a subset of 2 million objects. The second release will include those quantities for most objects. In order to provide a dataset that bridges the time gap between the Gaia DR1 and Gaia DR2 releases and partly remedies the lack of proper motions in the former, HSOY ("Hot Stuff for One Year") was created as a hybrid catalog between Gaia and ground-based astrometry, featuring proper motions (but no parallaxes) for a large fraction of the DR1 objects. While not attempting to compete with future Gaia releases in terms of data quality or number of objects, the aim of HSOY is to provide improved proper motions partly based on Gaia data, allowing studies to be carried out just now or as pilot studies for later projects requiring higher-precision data. The HSOY catalog was compiled using the positions taken from Gaia DR1 combined with the input data from the PPMXL catalog, employing the same weighted least-squares technique that was used to assemble the PPMXL catalog itself. This effect resulted in a four-parameter astrometric catalog containing 583 million stars, with Gaia DR1 quality positions and proper motions with precisions from far less than 1 mas/yr to 5 mas/yr, depending on object brightness and location on the sky. Description: The HSOY catalogue an all-sky catalogue with positions and proper motions for 583 million stars, as well photometry from 2MASS, Gaia DR1, and USNO-B. The astrometry is derived from positions of Gaia DR1 (Cat. I/337) and the astrometry given in the PPMXL catalogue (Cat. I/317). The formal errors in proper motion range from less than 1mas/yr at the bright end (about 6mag in G) to about 4mas/yr near the faint end (about 20mag in G).