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| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Volans |
| Right ascension | 08h05m 23.69129s[1] |
| Declination | −74° 24′ 37.4873″[1] |
| Apparent magnitude (V) | 9.09 ± 0.02[2] |
| Characteristics | |
| Spectral type | G5 IV/V[3] |
| B−V color index | +0.68[2] |
| Astrometry | |
| Radial velocity (Rv) | 11.60 ± 0.49[4] km/s |
| Proper motion (μ) | RA: −78.195 mas/yr[1] Dec.: +78.973 mas/yr[1] |
| Parallax (π) | 12.7204 ± 0.0101 mas[1] |
| Distance | 256.4 ± 0.2 ly (78.61 ± 0.06 pc) |
| Absolute magnitude (MV) | +4.66[5] |
| Details[6] | |
| Mass | 1.12 ± 0.05 M☉ |
| Radius | 1.02 ± 0.05 R☉ |
| Luminosity | 1.17+0.06 −0.07 L☉ |
| Surface gravity (log g) | 4.43 ± 0.04[7] cgs |
| Temperature | 5,907 ± 68[7] K |
| Metallicity [Fe/H] | +0.29 ± 0.10 dex |
| Rotational velocity (v sin i) | 2.9 ± 0.2 km/s |
| Age | 1 ± 0.9[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
HD 68402 is a solitary star located in the circumpolar constellation Volans. With an apparent magnitude of 9.09,[2] it is invisible to the naked eye but can be seen with an amateur telescope. This star is located at a distance of 256 light years based on its parallax shift but is drifting away at a rate of 11.60 km/s.[4]
HD 68402 has a classification of G5 IV/V,[3] which indicates that it is a G5 star with the characteristics of a subgiant and main-sequence star. Contrary to its classification, it is actually a G1 dwarf.[6] At present it is slightly more massive than the Sun and has a similar radius to the latter.[6] It radiates at 1.17[6] times the luminosity of the Sun from its photosphere at an effective temperature of 5,907 K,[7] which gives it a yellow hue. At an age of 1 billion years HD 68402[7] has a projected rotational velocity of almost 3 km/s and is metal rich like most planetary hosts (1.94 times to be exact).[6]
In 2017, a superjovian planet was discovered using doppler spectroscopy data from HARPS and CORALIE.[6] In 2023, the inclination and true mass of HD 68402 b were determined via astrometry.[8]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (years) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 7.9+1.7 −1.5 MJ |
2.239+0.11 −0.075 |
3.15+0.22 −0.14 |
0.225+0.15 −0.082 |
20.3+6.2 −4.1or159.7+4.1 −6.2° |
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