Astronomy:HD 5388

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Short description: Star in the constellation Phoenix
HD 5388
Observation data
Equinox J2000.0]] (ICRS)
Constellation Phoenix[1]
Right ascension  00h 55m 11.88996s[2]
Declination −47° 24′ 21.4772″[2]
Apparent magnitude (V) 6.73[3]
Characteristics
Evolutionary stage main sequence[2]
Spectral type F6V[3]
Apparent magnitude (B) 7.73[4]
Apparent magnitude (J) 5.795[5]
Apparent magnitude (H) 5.524[5]
Apparent magnitude (K) 5.441[5]
B−V color index 0.500[3]
Astrometry
Radial velocity (Rv)+39.46±0.12[2] km/s
Proper motion (μ) RA: −80.390[2] mas/yr
Dec.: −178.083[2] mas/yr
Parallax (π)18.8432 ± 0.0199[2] mas
Distance173.1 ± 0.2 ly
(53.07 ± 0.06 pc)
Absolute magnitude (MV)3.10[3]
Details[3]
Mass1.21 M☉
Radius1.87+0.03
−0.04[6] R☉
Luminosity4.770+0.012
−0.011[6] L☉
Surface gravity (log g)4.28±0.06 cgs
Temperature6,297±32 K
Metallicity [Fe/H]−0.27±0.02 dex
Rotation23 days
Rotational velocity (v sin i)4.2 km/s
Age5.5±0.5[7] Gyr
Other designations
CD−48°216, HD 5388, HIP 4311, SAO 215291, PPM 305379, LTT 4311, NLTT 3057[8]
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

HD 5388 is a single[9] star in the southern constellation of Phoenix. It has the Gould designation 78 G. Phoenicis,[10] 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.[3] It is located at a distance of 173 light-years from the Sun based on parallax, and is drifting further away with a radial velocity of +39 km/s.[2]

This object is an ordinary F-type main-sequence star with a stellar classification of F6V,[3] 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,[3] and radiates 4.8[6] times the Sun's luminosity from its photosphere at an effective temperature of 6297 K.[6]

In 2009, a substellar object (HD 5388 b) was detected in orbit around the star using the HARPS instrument at La Silla Observatory. Its minimum mass is consistent with a gas giant planet, and it has an elliptical orbit with a period of 2.13 years.[3] Later astrometric observations suggested that this object is a massive brown dwarf in a nearly face-on orbit rather than a planet,[11][12] but a more recent astrometric study in 2026 found a much smaller true mass, again consistent with a planet.[13]

The HD 5388 planetary system[13]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 3.2+0.3
−0.2 MJ 		1.757±0.001 772.5±1.0 0.41±0.02 38.7+10.2
−6.8° 		—

See also

References

  1. ↑ Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 2.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 Santos, Nuno C.; Mayor, Michel; Benz, Willy; Bouchy, François et al. (2010). "The HARPS Search for Southern Extra-solar Planets XXI. Three New Giant Planets Orbiting the Metal-poor Stars HD 5388, HD 181720, and HD 190984". Astronomy and Astrophysics 512 (A47): A47. doi:10.1051/0004-6361/200913489. Bibcode: 2010A&A...512A..47S. 
  4. ↑ Høg, E. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. doi:10.1888/0333750888/2862. ISBN 978-0333750889. Bibcode: 2000A&A...355L..27H. 
  5. ↑ 5.0 5.1 5.2 Cutri, R. M. et al. (June 2003). 2MASS All Sky Catalog of point sources. NASA/IPAC. Bibcode: 2003tmc..book.....C. 
  6. ↑ 6.0 6.1 6.2 6.3 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ Bonfanti, A. et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics 575: A18. doi:10.1051/0004-6361/201424951. Bibcode: 2015A&A...575A..18B. 
  8. ↑ "HD 5388". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+5388. 
  9. ↑ Tokovinin, Andrei (2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal 147 (4): 87. doi:10.1088/0004-6256/147/4/87. Bibcode: 2014AJ....147...87T. 
  10. ↑ Gould, Benjamin Apthorp. "Uranometria Argentina". http://www.uranometriaargentina.com/. 
  11. ↑ Sahlmann, J. et al. (2011). "HD 5388 b is a 69 MJup companion instead of a planet". Astronomy and Astrophysics Letters 528: L8. doi:10.1051/0004-6361/201116533. Bibcode: 2011A&A...528L...8S. 
  12. ↑ Kiefer, F. et al. (January 2021). "Determining the true mass of radial-velocity exoplanets with Gaia. Nine planet candidates in the brown dwarf or stellar regime and 27 confirmed planets". Astronomy & Astrophysics 645. doi:10.1051/0004-6361/202039168. Bibcode: 2021A&A...645A...7K. 
  13. ↑ 13.0 13.1 Piccinini, G. et al. (January 2026). "True Masses using RV data with Hipparcos and Gaia Astrometry". Astronomy & Astrophysics. 

Coordinates: Sky map 00h 55m 11.8897s, −47° 24′ 21.475″



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