HD 207129

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HD 207129
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Grus
Right ascension 21h 48m 15.7514s[1]
Declination −47° 18′ 13.014″[1]
Apparent magnitude (V) 5.58[1]
Spectral type G2V[1]
U−B color index +0.08[2]
B−V color index +0.60[2]
Radial velocity (Rv) −7.6 ± 0.2[1] km/s
Proper motion (μ) RA: 165.64[1] mas/yr
Dec.: −295.00[1] mas/yr
Parallax (π) 63.95 ± 0.78[1] mas
Distance 51.0 ± 0.6 ly
(15.6 ± 0.2 pc)
Absolute magnitude (MV) 4.61[3]
Mass 0.97 (0.92 to 1.04)[4] M
Radius 1.0[5] R
Temperature 5900[4] K
Metallicity [Fe/H] −0.15[4] dex
Rotational velocity (v sin i) 2[4] km/s
Age 3.8 (1.3 to 7.4)[4] Gyr
Other designations
CCDM J21483-4718A, CD−47 13928, CPD−47 9758, FK5 1573, GC 30516, Gliese 838, GJ 838, HR 8323, HIP 107649, IDS 21418-4746 A, LTT 8704, NLTT 52100, PPM 327579, SAO 230846, WDS J21483-4718A.[1]
Database references

HD 207129 is a G-type pre-main-sequence star in the constellation of Grus.[1] It has an apparent visual magnitude of approximately 5.58.[1] 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.[4]

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.[6]

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,[7] but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion.[8]


  1. ^ a b c d e f g h i j k HD 207129 -- Pre-main sequence Star, database entry, SIMBAD. Accessed on line February 9, 2011.
  2. ^ a b 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.
  3. ^ From apparent magnitude and parallax.
  4. ^ a b c d e f 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.
  5. ^ 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.
  6. ^ 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, Bibcode2010AJ....140.1051K.
  7. ^ 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.
  8. ^ Notes, WDS 21483-4718, The Washington Double Star Catalog, B. D. Mason et al., version 2011-02-06, VizieR database B/wds.