HD 207129

HD 207129 is a G-type main-sequence star about 50.7 light-years away in the constellation of Grus. It has an apparent visual magnitude of approximately 5.6. 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, which astronomers refer to as the star's metallicity.^[7]

Image of the disk from the REASONS survey^[6]

ConstellationGrus^[1]

Right ascension21^h 48^m 15.7512^s[2]

Declination−47° 18′ 13.018″^[2]

Apparentmagnitude(V)5.57^[1]

Quick facts Constellation, Right ascension ...

HD 207129

Location of HD 207129 (circled in red)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Grus[1]
Right ascension	21h 48m 15.7512s[2]
Declination	−47° 18′ 13.018″[2]
Apparent magnitude (V)	5.57[1]
Characteristics
Evolutionary stage	main sequence[3][2]
Spectral type	G2V[1]
U−B color index	+0.08[4]
B−V color index	+0.60[4]
Astrometry
Radial velocity (Rv)	−7.55±0.12[2] km/s
Proper motion (μ)	RA: +165.069[2] mas/yr Dec.: −295.553[2] mas/yr
Parallax (π)	64.2717±0.0430 mas[2]
Distance	50.75 ± 0.03 ly (15.56 ± 0.01 pc)
Absolute magnitude (MV)	+4.55[1]
Details
Mass	1.06±0.01[5] M☉
Radius	1.062±0.008[6] R☉
Luminosity	1.219±0.007[6] L☉
Surface gravity (log g)	4.47±0.01[5] cgs
Temperature	5,932±3[5] K
Metallicity [Fe/H]	−0.007±0.003[5] dex
Rotation	~12.6[3] days
Rotational velocity (v sin i)	2[7] km/s
Age	2.70+0.23 −0.28[5] Gyr
Other designations
CD−47 13928, CPD−47 9758, FK5 1573, GC 30516, GJ 838, HD 207129, HIP 107649, HR 8323, SAO 230846, PPM 327579, CCDM J21483-4718A, WDS J21483-4718A, LTT 8704, NLTT 52100, IDS 21418-4746 A[8]
Database references
SIMBAD	data

Close

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.^[9]

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,^[10] but based on comparison of proper motions, it is believed to be an optical double and not physically related to its companion.^[11] Gaia astrometry shows that this star has a much smaller parallax than HD 207129, confirming that it is an unrelated background star.^[12]