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HD 149837

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HD 149837
Observation data
Epoch J2000      Equinox J2000
Constellation Ara[1]
A
Right ascension 16h 40m 50.48327s[2]
Declination −60° 26′ 47.2071″[2]
Apparent magnitude (V) 6.18[3]
B
Right ascension 16h 40m 50.61454s[4]
Declination −60° 26′ 45.8673″[4]
Apparent magnitude (V) 8.98[5]
Characteristics
A
Spectral type F6V[6]
Apparent magnitude (B) 6.660
Apparent magnitude (J) 5.217
Apparent magnitude (H) 4.969
Apparent magnitude (K) 4.886
B−V color index +0.17[3]
Astrometry
A
Radial velocity (Rv)3.9±0.2[7] km/s
Proper motion (μ) RA: +59.084 mas/yr[2]
Dec.: −73.274 mas/yr[2]
Parallax (π)31.3707±0.0212 mas[2]
Distance103.97 ± 0.07 ly
(31.88 ± 0.02 pc)
Absolute magnitude (MV)+3.69[1]
B
Proper motion (μ) RA: +57.834 mas/yr[4]
Dec.: −76.449 mas/yr[4]
Parallax (π)31.3785±0.0402 mas[4]
Distance103.9 ± 0.1 ly
(31.87 ± 0.04 pc)
Details
A
Mass1.25[8] M☉
Radius1.348[9] R☉
Luminosity2.634[9] L☉
Surface gravity (log g)4.16[6] cgs
Temperature6,401±80[10] K
Metallicity [Fe/H]−0.08[6] dex
Age2.90[10] Gyr
B
Mass0.79[8] M☉
Radius0.67[11] R☉
Luminosity0.248[11] L☉
Temperature4,987[11] K
Other designations
CD−60°6381, HD 149837, HIP 81657, HR 6177, SAO 253651
Database references
SIMBADdata

HD 149837 is a binary star in the southern constellation of Ara. Parallax measurements give a distance of 103.9 light-years.

The components of this system have an estimated separation of 45.8 astronomical units.[8] The primary, of apparent magnitude +6.24, can be viewed to the naked eye only from sufficiently dark skies, far from light pollution.[12] Its spectrum mathces a class of F6V,[6] making it a F-type main-sequence star. Around 1.25 times more massive than the Sun[8] and 2.9 billion years old,[10] it has 1.35 times the Sun's radius and irradiates 2.6 times the Sun's luminosity from its photosphere[9] at an effective temperature of 6,401 K.[10]

The secondary's apparent magnitude is 8.98,[5] too faint to be viewed with the naked eye.[12] It has 0.79 times the mass of the Sun, 0.67 times the radius and irradiates 25% of its luminosity at an effective temperature of 4,987 K.[11]

References

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  1. ^ a b 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.
  2. ^ a b c d 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 Nicolet, B. (1978). "Photoelectric photometric Catalogue of homogeneous measurements in the UBV System". Astronomy and Astrophysics Supplement Series. 34: 1–49. Bibcode:1978A&AS...34....1N.
  4. ^ a b c d 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 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. Bibcode:2002A&A...384..180F. doi:10.1051/0004-6361:20011822.
  6. ^ a b c d Gray, R. O.; et al. (July 2006). "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
  7. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
  8. ^ a b c d Tokovinin, Andrei (April 2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 14. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87. S2CID 56066740. 87.
  9. ^ a b c Schofield, Mathew; Chaplin, William J.; Huber, Daniel; Campante, Tiago L.; Davies, Guy R.; Miglio, Andrea; Ball, Warrick H.; Appourchaux, Thierry; Basu, Sarbani; Bedding, Timothy R.; Christensen-Dalsgaard, Jørgen; Creevey, Orlagh; García, Rafael A.; Handberg, Rasmus; Kawaler, Steven D. (2019-03-01). "The Asteroseismic Target List for Solar-like Oscillators Observed in 2 minute Cadence with the Transiting Exoplanet Survey Satellite". The Astrophysical Journal Supplement Series. 241 (1): 12. arXiv:1901.10148. Bibcode:2019ApJS..241...12S. doi:10.3847/1538-4365/ab04f5. ISSN 0067-0049.
  10. ^ a b c d Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (June 2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv:1103.4651. Bibcode:2011A&A...530A.138C. doi:10.1051/0004-6361/201016276. ISSN 0004-6361.
  11. ^ a b c d Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  12. ^ a b "Limiting Magnitude | COSMOS". astronomy.swin.edu.au. Retrieved 2025-06-01.
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