HD 23596
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Perseus
Right ascension 03h 48m 00.37471s[1]
Declination +40° 31′ 50.2940″[1]
Apparent magnitude (V) 7.25[2]
Characteristics
Evolutionary stage Subgiant[1]
Spectral type F8
B−V color index 0.634±0.009[2]
Astrometry
Radial velocity (Rv)−10.18±0.13[1] km/s
Proper motion (μ) RA: 52.742±0.039 mas/yr[1]
Dec.: 21.740±0.026 mas/yr[1]
Parallax (π)19.3247 ± 0.0306 mas[1]
Distance168.8 ± 0.3 ly
(51.75 ± 0.08 pc)
Absolute magnitude (MV)3.74[2]
Details[3]
Mass1.2±0.04 M☉
Radius1.53±0.04 R☉
Luminosity2.63±0.03 L☉
Surface gravity (log g)4.14±0.03 cgs
Temperature5,953±48 K
Metallicity [Fe/H]0.32±0.05 [4] dex
Rotational velocity (v sin i)3.59±0.59[4] km/s
Age5.0±0.7 Gyr
Other designations
BD+40º835, HD 23596, HIP 17747, SAO 39110, WDS J03480+4032A[5]
Database references
SIMBADdata

HD 23596 is a star with an orbiting exoplanet companion in the constellation Perseus. It has an apparent visual magnitude of 7.25,[2] which is too dim to be viewed with the naked eye. Based on parallax measurements, it is located at a distance of 169 light years from the Sun. The system is drifting closer with a radial velocity of −10 km/s.[1]

The stellar classification of this star is F8, making it an F-type star with an undefined luminosity class. It is 20% more massive than the Sun and has 153% of the Sun's girth. The visual luminosity of the star is 2.63 times greater than the Sun, which it is radiating from its photosphere at an effective temperature of 5,953 K. It has an estimated age of five billion years,[3] and is spinning with a projected rotational velocity of 3.6 km/s. The star is considered metal-rich, having a higher surface abundance of iron compared to the Sun.[4]

Planetary system

In June 2002, a massive long-period exoplanet orbiting the star was announced.[4] In 2022, the inclination and true mass of HD 23596 b were measured via astrometry.[6] It is orbiting at a distance of 2.7 AU from the host star with an orbital period of 4.2 years and an eccentricity (ovalness) of 0.28. This body has a mass around 12 times that of the planet Jupiter.

The HD 23596 planetary system[6]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(years)		 Eccentricity Inclination Radius
b 11.914+0.990
−1.768 MJ		 2.694+0.107
−0.118		 4.203+0.021
−0.025		 0.282+0.017
−0.014		 38.898+15.759
−77.179°		 —

References

  1. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 4 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID 119257644.
  3. 1 2 Bonfanti, A.; et al. (2015). "Revising the ages of planet-hosting stars". Astronomy and Astrophysics. 575. A18. arXiv:1411.4302. Bibcode:2015A&A...575A..18B. doi:10.1051/0004-6361/201424951. S2CID 54555839.
  4. 1 2 3 4 Perrier, C.; et al. (2003). "The ELODIE survey for northern extra-solar planets. I. Six new extra-solar planet candidates". Astronomy and Astrophysics. 410 (3): 1039–1049. arXiv:astro-ph/0308281. Bibcode:2003A&A...410.1039P. doi:10.1051/0004-6361:20031340. S2CID 6946291.
  5. ↑ "HD 23596". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2023-12-12.
  6. 1 2 Feng, Fabo; Butler, R. Paul; et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series. 262 (21): 21. arXiv:2208.12720. Bibcode:2022ApJS..262...21F. doi:10.3847/1538-4365/ac7e57. S2CID 251864022.
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