Epoch J2000.0 Equinox J2000.0 (ICRS)
|Right ascension||21h 48m 15.7514s|
|Declination||−47° 18′ 13.014″|
|Apparent magnitude (V)||5.58|
|U−B color index||+0.08|
|B−V color index||+0.60|
|Radial velocity (Rv)||−7.6 ± 0.2 km/s|
|Proper motion (μ)||RA: 165.64 mas/yr
Dec.: −295.00 mas/yr
|Parallax (π)||63.95 ± 0.78 mas|
|Distance||51.0 ± 0.6 ly
(15.6 ± 0.2 pc)
|Absolute magnitude (MV)||4.61|
|Mass||0.97 (0.92 to 1.04) M☉|
|Metallicity [Fe/H]||−0.15 dex|
|Rotational velocity (v sin i)||2 km/s|
|Age||3.8 (1.3 to 7.4) Gyr|
HD 207129 is a G-type pre-main-sequence star in the constellation of Grus. It has an apparent visual magnitude of approximately 5.58. This is a Sun-like star with the same stellar classification G2V and a similar mass. It is roughly the same age as the Sun, but has a lower abundance of elements other than hydrogen and helium; what astronomers term the star's metallicity.
A debris disk has been imaged around this star in visible light using the ACS instrument on the Hubble Space Telescope; it has also been imaged in the infrared (70 μm) using the MIPS instrument on the Spitzer Space Telescope. Based on the ACS image, the disk appears to have a radius of about 163 astronomical units and to be about 30 AU wide, and to be inclined at 60° to the plane of the sky.
Another star, CCDM J21483-4718B (also designated CD−47 13929 or WDS J21483-4718B), of apparent visual magnitude 8.7, has been observed 55 arcseconds away from this star, but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion.
- HD 207129 -- Pre-main sequence Star, database entry, SIMBAD. Accessed on line February 9, 2011.
- HR 8323, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line February 9, 2011.
- From apparent magnitude and parallax.
- HD 207129, database entry, The Geneva-Copenhagen Survey of Solar neighbourhood, J. Holmberg et al., 2007, CDS ID V/117A. Accessed on line February 9, 2011.
- HD 207129, database entry, Catalog of Apparent Diameters and Absolute Radii of Stars (CADARS), 3rd edition, L. E. Pasinetti-Fracassini, L. Pastori, S. Covino, and A. Pozzi, CDS ID II/224. Accessed on line February 9, 2011.
- HST and Spitzer Observations of the HD 207129 Debris Ring, John E. Krist et al., The Astronomical Journal 140, #4 (October 2010), pp. 1051-1061, doi:10.1088/0004-6256/140/4/1051, Bibcode: 2010AJ....140.1051K .
- CCDM J21483-4718, database entry, CCDM (Catalog of Components of Double & Multiple stars), J. Dommanget and O. Nys, second edition, 2002, VizieR database I/274.
- Notes, WDS 21483-4718, The Washington Double Star Catalog, B. D. Mason et al., version 2011-02-06, VizieR database B/wds.