HD 29587

HD 29587
Observation data; Epoch J2000 Equinox ICRS
Constellation	Perseus
Right ascension	04h 41m 36.31556s
Declination	+42° 07′ 06.4241″
Apparent magnitude (V)	7.29
Characteristics
Evolutionary stage	main sequence
Spectral type	G2 V
B−V color index	0.633
Astrometry
Radial velocity (Rv)	+112.75±0.16 km/s
Proper motion (μ)	RA: +534.631 mas/yr ; Dec.: −414.946 mas/yr
Parallax (π)	36.6470±0.0410 mas
Distance	89.00 ± 0.10 ly ; (27.29 ± 0.03 pc)
Absolute magnitude (MV)	5.08
Orbit
Period (P)	1,474.9±10.2 d
Eccentricity (e)	0.713±0.006
Periastron epoch (T)	JD 2,447,763.5±45.8
Argument of periastron (ω); (secondary)	80.2±13.3°
Semi-amplitude (K1); (primary)	1.02±0.16 km/s
Details
Mass	1.033±0.010 M☉
Radius	0.91 R☉
Luminosity	0.798+0.040; −0.038 L☉
Surface gravity (log g)	4.54±0.22 cgs
Temperature	5,709±35 K
Metallicity [Fe/H]	−0.51±0.05 dex
Age	14.7+3.8; −2.7 Gyr
Other designations
	BD+41°931, FK5 4419, HD 29587, HIP 21832, SAO 39690, TYC 2901-00064-1, 2MASS J04413631+4207065
Database references
SIMBAD	data
Exoplanet Archive	data

HD 29587 is a Sun-like star with a candidate brown dwarf companion in the northern constellation of Perseus. It has an apparent visual magnitude of 7.29, which means it is too faint to be viewed with the naked eye. Based upon an annual parallax shift of 36.6 mas, it is located 89.8 light years away. The star is moving away from the Earth with a heliocentric radial velocity of +113 km/s, having come to within 55.8 ly some 148,000 years ago. It is a hyper-velocity halo star moving at a rate of 170 km/s relative to the local standard of rest.

This ancient star has a stellar classification of G2 V, matching a G-type main-sequence star. It has 78% of the mass of the Sun and is radiating 80% of the Sun's luminosity from its photosphere at an effective temperature of 5,709 K.

Planetary system

Formerly an IAU radial velocity standard, this star was found to have a variable radial velocity due to a suspected orbiting companion. The a sin i value for the unseen object is 0.0957 ± 0.0108 AU (14.31 ± 1.62 Gm), where a is the semimajor axis and i is the orbital inclination – providing a lower bound for the semimajor axis. The secondary object most likely has a mass in the range 41.0–97.8 M_J, making it a probable brown dwarf.

The HD 29587 planetary system
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination (°)	Radius
b	≥ 55.2±9.2 `M`_J	2.57	1,474.9±10.2	0.356±0.095	—	—

Notes

↑ Derived from known temperature and luminousity of star; in good agreement with value derived from known mass and surface gravity of star
↑ Derived from known mass of star and orbital period of object

References

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. XHIP record for this object at VizieR.
1 2 3 4 5 6 7 8 9 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.
1 2 3 4 5 6 Da Silva, Ronaldo; et al. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics. 580: A24. arXiv:1505.01726. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770. S2CID 119216425.
1 2 Halbwachs, J. L.; et al. (March 2000). "Exploring the brown dwarf desert with Hipparcos". Astronomy and Astrophysics. 355: 581–594. Bibcode:2000A&A...355..581H.
1 2 3 Kiefer, F.; et al. (2019), "Detection and characterisation of 54 massive companions with the SOPHIE spectrograph", Astronomy & Astrophysics, 631: A125, arXiv:1909.00739, doi:10.1051/0004-6361/201935113, S2CID 202538098
↑ "HD 29587". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-02.
1 2 Fossati, L.; et al. (2017). "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies". Astronomy & Astrophysics. 601: 17. arXiv:1702.02883. Bibcode:2017A&A...601A.104F. doi:10.1051/0004-6361/201630339. S2CID 17549819. A104.
1 2 Mazeh; Latham, David W.; Stefanik, Robert P. (1996). "Spectroscopic Orbits for Three Binaries with Low-Mass Companions and the Distribution of Secondary Masses near the Substellar Limit". Astrophysical Journal. 466: 415–427. Bibcode:1996ApJ...466..415M. CiteSeerX 10.1.1.30.5905. doi:10.1086/177521. {{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)
↑ Hobbs, L. M.; Duncan, Douglas K. (June 15, 1987). "The lithium abundance in halo stars". Astrophysical Journal, Part 1. 317: 796–809. Bibcode:1987ApJ...317..796H. doi:10.1086/165328.
1 2 Reffert, S.; Quirrenbach, A. (March 2011). "Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs". Astronomy & Astrophysics. 527: 22. arXiv:1101.2227. Bibcode:2011A&A...527A.140R. doi:10.1051/0004-6361/201015861. S2CID 54986291. A140.

[6] Derived from known temperature and luminousity of star; in good agreement with value derived from known mass and surface gravity of star

[12] Derived from known mass of star and orbital period of object

[Anderson2012-1] 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. XHIP record for this object at VizieR.

[GaiaDR3-2] 1 2 3 4 5 6 7 8 9 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.

[DaSilva2015-3] 1 2 3 4 5 6 Da Silva, Ronaldo; et al. (2015). "Homogeneous abundance analysis of FGK dwarf, subgiant, and giant stars with and without giant planets". Astronomy & Astrophysics. 580: A24. arXiv:1505.01726. Bibcode:2015A&A...580A..24D. doi:10.1051/0004-6361/201525770. S2CID 119216425.

[Halbwachs2000-4] 1 2 Halbwachs, J. L.; et al. (March 2000). "Exploring the brown dwarf desert with Hipparcos". Astronomy and Astrophysics. 355: 581–594. Bibcode:2000A&A...355..581H.

[Kiefer2019-5] 1 2 3 Kiefer, F.; et al. (2019), "Detection and characterisation of 54 massive companions with the SOPHIE spectrograph", Astronomy & Astrophysics, 631: A125, arXiv:1909.00739, doi:10.1051/0004-6361/201935113, S2CID 202538098

[SIMBAD-7] "HD 29587". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-02.

[Fossati2015-8] 1 2 Fossati, L.; et al. (2017). "The effect of ISM absorption on stellar activity measurements and its relevance for exoplanet studies". Astronomy & Astrophysics. 601: 17. arXiv:1702.02883. Bibcode:2017A&A...601A.104F. doi:10.1051/0004-6361/201630339. S2CID 17549819. A104.

[Mazeh1996-9] 1 2 Mazeh; Latham, David W.; Stefanik, Robert P. (1996). "Spectroscopic Orbits for Three Binaries with Low-Mass Companions and the Distribution of Secondary Masses near the Substellar Limit". Astrophysical Journal. 466: 415–427. Bibcode:1996ApJ...466..415M. CiteSeerX 10.1.1.30.5905. doi:10.1086/177521. {{cite journal}}: Cite uses deprecated parameter |citeseerx= (help)

[Hobbs1987-10] Hobbs, L. M.; Duncan, Douglas K. (June 15, 1987). "The lithium abundance in halo stars". Astrophysical Journal, Part 1. 317: 796–809. Bibcode:1987ApJ...317..796H. doi:10.1086/165328.

[Reffert2011-11] 1 2 Reffert, S.; Quirrenbach, A. (March 2011). "Mass constraints on substellar companion candidates from the re-reduced Hipparcos intermediate astrometric data: nine confirmed planets and two confirmed brown dwarfs". Astronomy & Astrophysics. 527: 22. arXiv:1101.2227. Bibcode:2011A&A...527A.140R. doi:10.1051/0004-6361/201015861. S2CID 54986291. A140.