HD 5388

HD 5388 is a single^[7] star in the southern constellation of Phoenix. It has the Gould designation 78 G. Phoenicis,^[8] while HD 5388 is the star's Henry Draper Catalogue identifier. This object has a yellow-white hue and is too faint to be readily visible to average human eyesight, having an apparent visual magnitude of 6.73.^[2] It is located at a separation of 173 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +39 km/s.^[1]

HD 5388

Observation data Epoch J2000.0      Equinox J2000.0
Constellation	Phoenix
Right ascension	00h 55m 11.88995s[1]
Declination	−47° 24′ 21.4763″[1]
Apparent magnitude (V)	6.73[2]
Characteristics
Evolutionary stage	main sequence
Spectral type	F6V[2]
Apparent magnitude (B)	7.73[3]
Apparent magnitude (J)	5.795[4]
Apparent magnitude (H)	5.524[4]
Apparent magnitude (K)	5.441[4]
B−V color index	0.500[2]
Astrometry
Radial velocity (Rv)	+39.40±0.16[1] km/s
Proper motion (μ)	RA: −80.390[1] mas/yr Dec.: −178.132[1] mas/yr
Parallax (π)	18.8155±0.0268 mas[1]
Distance	173.3 ± 0.2 ly (53.15 ± 0.08 pc)
Absolute magnitude (MV)	3.10[2]
Details[2]
Mass	1.21 M☉
Radius	1.87+0.03 −0.04[1] R☉
Luminosity	4.770+0.012 −0.011[1] L☉
Surface gravity (log g)	4.28±0.06 cgs
Temperature	6,297±32 K
Metallicity [Fe/H]	−0.27±0.02 dex
Rotation	23 days
Rotational velocity (v sin i)	4.2 km/s
Age	5.5±0.5[5] Gyr
Other designations
78 G. Phoenicis, CD−48°216, HD 5388, HIP 4311, SAO 215291, PPM 305379, LTT 4311, NLTT 3057[6]
Database references
SIMBAD	data

This object is an ordinary F-type main-sequence star with a stellar classification of F6V,^[2] indicating that it is generating energy through core hydrogen fusion. It is not chromospherically active and its metal content is half as much as the Sun. The star is larger and more massive than the Sun,^[2] and radiates 4.8^[1] times the Sun's luminosity from its photosphere at an effective temperature of 6297 K.^[1]

In 2009, a substellar object (HD 5388 b) thought to be a gas giant planet was detected in orbit around the star using the HARPS instrument at La Silla Observatory.^[2] This was later demonstrated to be a brown dwarf rather than a planet. It has an elliptical orbit with a period of 2.13 years.^[9]

The HD 5388 planetary system^[2][9][10]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	87.02+13.99 −10.80 MJ	1.76	777±4	0.40±0.02	1.356+0.195 −0.191°	—

See also

• HD 181720
• HD 190984