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HD 207129
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.〔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, , .〕
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,〔(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 ).〕 but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion.〔(Notes, WDS 21483-4718 ), The Washington Double Star Catalog, B. D. Mason et al., version 2011-02-06, VizieR database (B/wds ).〕
==References==
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