Astronomy:HD 115404

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Short description: Binary star in the constellation Coma Berenices
HD 115404
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Coma Berenices[1]
HD 115404 A
Right ascension  13h 16m 51.05143s[2]
Declination +17° 01′ 01.8409″[2]
Apparent magnitude (V) 6.66[3]
HD 115404 B
Right ascension  13h 16m 51.55401s[4]
Declination +17° 00′ 59.8921″[4]
Apparent magnitude (V) 9.50[3]
Characteristics
HD 115404 A
Evolutionary stage main sequence[2]
Spectral type K2 V[5]
U−B color index +0.623[6]
B−V color index +0.917[6]
HD 115404 B
Evolutionary stage main sequence[4]
Spectral type M0.5 V[7]
B−V color index +1.232[8]
Astrometry
HD 115404 A
Radial velocity (Rv)7.62 ± 0.09[9] km/s
Proper motion (μ) RA: 636.285(28)[2] mas/yr
Dec.: −264.678(31)[2] mas/yr
Parallax (π)91.0176 ± 0.0236[2] mas
Distance35.834 ± 0.009 ly
(10.987 ± 0.003 pc)
Absolute magnitude (MV)+6.3[10]
HD 115404 B
Radial velocity (Rv)5.95±0.13[4] km/s
Proper motion (μ) RA: 649.666(31) mas/yr
Dec.: −263.937(26) mas/yr
Parallax (π)90.9475 ± 0.0232[4] mas
Distance35.862 ± 0.009 ly
(10.995 ± 0.003 pc)
Absolute magnitude (MV)10.1[10]
Orbit[11]
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[12] M☉
Radius0.76±0.02[12] R☉
Luminosity3.1[12] L☉
Surface gravity (log g)4.58±0.03[12] cgs
Temperature4976[12] K
Metallicity [Fe/H]−0.08[12] dex
Rotation18.2 days[13]
Rotational velocity (v sin i)2.8[12] km/s
Age10.2 (5.4–13.5)[12] Gyr
HD 115404 B
Mass0.542[14] M☉
Radius0.550[14] R☉
Luminosity0.043[15] L☉
Surface gravity (log g)4.90[15] cgs
Temperature3,709[16] K
Rotational velocity (v sin i)9.6[15] km/s
Age3.0[16] Gyr
Other designations
BD+17°2611, GJ 505, HD 115404, HIP 64797, SAO 100491, LHS 2713[17]
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.[18] The combined apparent magnitude of the system is 6.52,[17] with the magnitudes of the components being 6.66 and 9.50.[3]

The primary component, designated A, is a K-type main sequence star.[5] It is about 70% as massive as the Sun, and is 0.76 times as wide.[12] Its companion is a red dwarf (M0.5 V).[7] It has 54.2% the mass of the Sun, and is 0.55 times as wide.[14] The two stars orbit each other every 770 years, and are separated by about 8″.[11] The system is thought to be fairly old, at 5.4 to 13.5 billion years old.[12]

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.[19] However, a 2025 study using radial velocity observations failed to detect these planets.[20]

The HD 115404 A planetary system[19]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius

Template:Orbitbox planet hypothetical Template:Orbitbox planet hypothetical

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific 99 (617): 695. doi:10.1086/132034. Bibcode: 1987PASP...99..695R  Constellation record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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 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. doi:10.1051/0004-6361:20011822. Bibcode: 2002A&A...384..180F. 
  4. ↑ 4.0 4.1 4.2 4.3 4.4 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.
  5. ↑ 5.0 5.1 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. doi:10.1086/514336. Bibcode: 2007AJ....133.2524W. 
  6. ↑ 6.0 6.1 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. ↑ 7.0 7.1 Alonso-Floriano, F. J.; Morales, J. C.; Caballero, J. A.; Montes, D.; Klutsch, A.; Mundt, R.; Cortés-Contreras, M.; Ribas, I. et al. (2015). "CARMENES input catalogue of M dwarfs". Astronomy & Astrophysics 577: A128. doi:10.1051/0004-6361/201525803. Bibcode: 2015A&A...577A.128A. 
  8. ↑ Herrero, E. et al. (January 2012). "Optimizing exoplanet transit searches around low-mass stars with inclination constraints". Astronomy & Astrophysics 537: A147. doi:10.1051/0004-6361/201117809. Bibcode: 2012A&A...537A.147H. 
  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. doi:10.1051/0004-6361/201014948. Bibcode: 2010A&A...521A..12M. 
  10. ↑ 10.0 10.1 Allen, Christine; Monroy-Rodríguez, Miguel A. (2014). "An Improved Catalog of Halo Wide Binary Candidates". The Astrophysical Journal 790 (2): 158. doi:10.1088/0004-637X/790/2/158. Bibcode: 2014ApJ...790..158A. 
  11. ↑ 11.0 11.1 "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.usno.navy.mil/USNO/astrometry/optical-IR-prod/wds/orb6. 
  12. ↑ 12.00 12.01 12.02 12.03 12.04 12.05 12.06 12.07 12.08 12.09 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. doi:10.3847/0067-0049/225/2/32. Bibcode: 2016ApJS..225...32B. 
  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. doi:10.1051/0004-6361/202141020. Bibcode: 2022A&A...661A..24F. 
  14. ↑ 14.0 14.1 14.2 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. doi:10.3847/1538-4357/834/1/85. Bibcode: 2017ApJ...834...85N. 
  15. ↑ 15.0 15.1 15.2 Luck, R. Earle (2017). "Abundances in the Local Region II: F, G, and K Dwarfs and Subgiants". The Astronomical Journal 153 (1): 21. doi:10.3847/1538-3881/153/1/21. Bibcode: 2017AJ....153...21L. 
  16. ↑ 16.0 16.1 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. doi:10.1088/0004-637X/804/1/64. Bibcode: 2015ApJ...804...64M. 
  17. ↑ 17.0 17.1 "HD 115404". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=HD+115404. 
  18. ↑ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  19. ↑ 19.0 19.1 Feng, Fabo et al. (August 2022). "3D Selection of 167 Substellar Companions to Nearby Stars". The Astrophysical Journal Supplement Series 262 (21): 21. doi:10.3847/1538-4365/ac7e57. Bibcode: 2022ApJS..262...21F. 
  20. ↑ Harada, Caleb K.; Dressing, Courtney D.; Turtelboom, Emma V.; Kane, Stephen R.; Blunt, Sarah; Dietrich, Jamie; Hinkel, Natalie R.; Li, Zhexing et al. (2025-09-23). "SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 Years of Precise Doppler Monitoring". The Astronomical Journal. 



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