Wikipedia

HD 115404

HD 115404
Observation data
Epoch J2000      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) mas/yr[2]
Dec.: −264.678(31) mas/yr[2]
Parallax (π)91.0176±0.0236 mas[2]
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[4]
Dec.: −263.937(26) mas/yr[4]
Parallax (π)90.9475±0.0232 mas[4]
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
b (disputed[20]) ≥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[20]) 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

[edit]
  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. ^ a b c d e 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. ^ a b c 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. ^ a b c d e f 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. ^ a b 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. ^ a b 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. ^ a b 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. ^ a b 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. ^ a b "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. ^ a b c d e f g h i j 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. ^ a b c 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. ^ a b c 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. ^ a b 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. ^ a b "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. ^ a b 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. ^ a b c Harada, Caleb K.; Dressing, Courtney D.; Turtelboom, Emma V.; Kane, Stephen R.; Blunt, Sarah; Dietrich, Jamie; Hinkel, Natalie R.; Li, Zhexing; Mamajek, Eric (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. arXiv:2409.10679.