01h07m 48.6630s[1]
–08° 14′ 01.3306″[1]
8.45[2]
Characteristics
main sequence
G5V[3]
9.087[4]
7.269[5]
6.99[5]
6.876[5]
B−V color index
0.662±0.009[2]
Radial velocity (Rv)
+34.76[2] km/s
Proper motion (μ)
RA: 192.637±0.114[1] mas/yr
Dec.: 20.080±0.069[1] mas/yr
Parallax (π)
167.7 ± 0.5 ly
(51.4 ± 0.1 pc)
Absolute magnitude (MV)
4.754[6]
Details
Surface gravity (log g)
Metallicity [Fe/H]
Rotational velocity (v sin i)
2.00±0.12[8] km/s
Database references
HD 6718 is a solar twin[10] star in the equatorial constellationofCetus. It has a yellow hue but is too faint to be viewed with the naked eye, having an apparent visual magnitude of 8.45.[2] The distance to this object, as determined from parallax measurements, is 168 light years. It is drifting away from the Sun with a radial velocity of +35 km/s.[2]
This object is an ordinary G-type main-sequence star with a stellar classification of G5V,[3] with the luminosity class of 'V' indicating it is generating energy through hydrogen fusion at its core. It is around six billion years old with a leisurely rotation rate, having a projected rotational velocity of 2 km/s.[8] The level of magnetic activity in the chromosphere is considered very low[6] and it has a near solar metallicity.[8] Being a solar twin, has nearly the same mass and radius as the Sun. The star is radiating 1.07[7] times the luminosity of the Sun from its photosphere at an effective temperature of 5,728 K.[8]
In 2009, a substellar companion (HD 6718 b) with a minimum massof1.56 MJ was found in orbit around the star with a period of 6.83 years.[6] In 2020, the inclination of this object was measured, revealing its true mass to be 62.8 MJ. This makes it a brown dwarf.[11]
Companion
(in order from star)
b
62.79+16.98
−13.80 MJ
3.56+0.24
−0.15
2496±176
0.10+0.11
−0.04
1.488+0.410
−0.310°
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ignored (help)
Other
Other