HD 115404

HD 115404
Observation data
Epoch J2000      Equinox ICRS
Constellation Coma Berenices
HD 115404 A
Right ascension 13h 16m 51.05143s
Declination +17° 01′ 01.8409″
Apparent magnitude (V) 6.66
HD 115404 B
Right ascension 13h 16m 51.55401s
Declination +17° 00′ 59.8921″
Apparent magnitude (V) 9.50
Characteristics
HD 115404 A
Evolutionary stage main sequence
Spectral type K2 V
U−B color index +0.623
B−V color index +0.917
HD 115404 B
Evolutionary stage main sequence
Spectral type M0.5 V
B−V color index +1.232
Astrometry
HD 115404 A
Radial velocity (Rv)7.62 ± 0.09 km/s
Proper motion (μ) RA: 636.285(28) mas/yr
Dec.: −264.678(31) mas/yr
Parallax (π)91.0176±0.0236 mas
Distance35.834 ± 0.009 ly
(10.987 ± 0.003 pc)
Absolute magnitude (MV)+6.3
HD 115404 B
Radial velocity (Rv)5.95±0.13 km/s
Proper motion (μ) RA: 649.666(31) mas/yr
Dec.: −263.937(26) mas/yr
Parallax (π)90.9475±0.0232 mas
Distance35.862 ± 0.009 ly
(10.995 ± 0.003 pc)
Absolute magnitude (MV)10.1
Orbit
Period (P)770.0 yr
Semi-major axis (a)8.06″
Eccentricity (e)0.12
Inclination (i)93.41°
Longitude of the node (Ω)104.66°
Periastron epoch (T)B 1875.0
Argument of periastron (ω)
(secondary)		276.99°
Details
HD 115404 A
Mass0.70±0.09 M☉
Radius0.76±0.02 R☉
Luminosity0.32 L☉
Surface gravity (log g)4.58±0.03 cgs
Temperature4976 K
Metallicity [Fe/H]−0.08 dex
Rotation18.2 days
Rotational velocity (v sin i)2.8 km/s
Age10.2 (5.4–13.5) Gyr
HD 115404 B
Mass0.542 M☉
Radius0.550 R☉
Luminosity0.043 L☉
Surface gravity (log g)4.90 cgs
Temperature3,709 K
Rotational velocity (v sin i)9.6 km/s
Age3.0 Gyr
Other designations
BD+17°2611, GJ 505, HD 115404, HIP 64797, SAO 100491, LHS 2713
Database references
SIMBADA
B
Exoplanet Archivedata
ARICNSA
B

HD 115404 is a binary star system located in the constellation Coma Berenices. Parallax measurements made by Hipparcos put the system at 36 light-years, or 11 parsecs, away. The combined apparent magnitude of the system is 6.52, with the magnitudes of the components being 6.66 and 9.50.

The primary component, designated A, is a K-type main sequence star. It is about 70% as massive as the Sun, and is 0.76 times as wide. Its companion is a red dwarf (M0.5 V). It has 54.2% the mass of the Sun, and is 0.55 times as wide. The two stars orbit each other every 770 years, and are separated by about 8″. The system is thought to be fairly old, at 5.4 to 13.5 billion years old.

In 2022, two exoplanets, Neptunian and super-Jovian in mass, were reported in orbit around the primary star using a combination of radial velocity and astrometry. However, a 2025 study using radial velocity observations failed to detect these planets.

The HD 115404 A planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination
(°)		 Radius
b (disputed) ≥0.097+0.020
−0.022 MJ		 0.088+0.003
−0.004		 10.5+0.001
−0.002		 0.232+0.197
−0.138		 — —
c (disputed) 10.319+1.473
−1.209 MJ		 11.364+3.301
−1.905		 15319.2+7240.3
−3526.2		 0.211+0.173
−0.102		 25.791+1.842
−2.157°		 —

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
  2. 1 2 3 4 5 6 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.
  3. 1 2 3 Fabricius, C.; Høg, E.; Makarov, V. V.; Mason, B. D.; Wycoff, G. L.; Urban, S. E. (2002). "The Tycho double star catalogue". Astronomy and Astrophysics. 384: 180–189. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  4. 1 2 3 4 5 6 7 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.
  5. 1 2 White, Russel J.; Gabor, Jared M.; Hillenbrand, Lynne A. (2007). "High-Dispersion Optical Spectra of Nearby Stars Younger Than the Sun". The Astronomical Journal. 133 (6): 2524. arXiv:0706.0542. Bibcode:2007AJ....133.2524W. doi:10.1086/514336. S2CID 122854.
  6. 1 2 Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally Published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M.
  7. 1 2 Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I.; Reiners, Ansgar; Amado, P. J.; Quirrenbach, A.; Jeffers, S. V. (2015). "CARMENES input catalogue of M dwarfs". Astronomy & Astrophysics. 577: A128. arXiv:1502.07580. Bibcode:2015A&A...577A.128A. doi:10.1051/0004-6361/201525803. S2CID 53135130.
  8. ↑ Herrero, E.; et al. (January 2012). "Optimizing exoplanet transit searches around low-mass stars with inclination constraints". Astronomy & Astrophysics. 537: A147. arXiv:1110.5840. Bibcode:2012A&A...537A.147H. doi:10.1051/0004-6361/201117809. S2CID 119299265.
  9. ↑ Maldonado, J.; Martínez-Arnáiz, R. M.; Eiroa, C.; Montes, D.; Montesinos, B. (2010). "A spectroscopy study of nearby late-type stars, possible members of stellar kinematic groups". Astronomy and Astrophysics. 521: A12. arXiv:1007.1132. Bibcode:2010A&A...521A..12M. doi:10.1051/0004-6361/201014948. S2CID 119209183.
  10. 1 2 Allen, Christine; Monroy-Rodríguez, Miguel A. (2014). "An Improved Catalog of Halo Wide Binary Candidates". The Astrophysical Journal. 790 (2): 158. arXiv:1406.5164. Bibcode:2014ApJ...790..158A. doi:10.1088/0004-637X/790/2/158.
  11. 1 2 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 11 August 2017.
  12. 1 2 3 4 5 6 7 8 9 10 Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai (2016). "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-Search Stars". The Astrophysical Journal Supplement Series. 225 (2): 32. arXiv:1606.07929. Bibcode:2016ApJS..225...32B. doi:10.3847/0067-0049/225/2/32. S2CID 118507965.
  13. ↑ Fuhrmeister, B.; Czesla, S.; Robrade, J.; González-Pérez, J. N.; Schneider, C.; Mittag, M.; Schmitt, J. H. M. M. (2022). "The corona - chromosphere connection studied with simultaneous eROSITA and TIGRE observations". Astronomy and Astrophysics. 661: A24. arXiv:2106.14546. Bibcode:2022A&A...661A..24F. doi:10.1051/0004-6361/202141020.
  14. 1 2 3 Newton, Elisabeth R.; Irwin, Jonathan; Charbonneau, David; Berlind, Perry; Calkins, Michael L.; Mink, Jessica (2017). "The Hα emission of nearby M dwarfs and its relation to stellar rotation". The Astrophysical Journal. 834 (1): 85. arXiv:1611.03509. Bibcode:2017ApJ...834...85N. doi:10.3847/1538-4357/834/1/85. S2CID 55000202.
  15. 1 2 3 Luck, R. Earle (2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal. 153 (1): 21. arXiv:1611.02897. Bibcode:2017AJ....153...21L. doi:10.3847/1538-3881/153/1/21.
  16. 1 2 Mann, Andrew W.; Feiden, Gregory A.; Gaidos, Eric; Boyajian, Tabetha; von Braun, Kaspar (2015). "How to Constrain Your M Dwarf: Measuring Effective Temperature, Bolometric Luminosity, Mass, and Radius". The Astrophysical Journal. 804 (1): 64. arXiv:1501.01635. Bibcode:2015ApJ...804...64M. doi:10.1088/0004-637X/804/1/64. S2CID 19269312.
  17. 1 2 "HD 115404". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 11 August 2017.
  18. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
  19. 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.
  20. 1 2 3 Harada, Caleb K.; Dressing, Courtney D.; Turtelboom, Emma V.; et al. (2025-12-01). "SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring". The Astronomical Journal. 170 (6): 343. arXiv:2409.10679. Bibcode:2025AJ....170..343H. doi:10.3847/1538-3881/ae0b62. ISSN 0004-6256.