HD 143787
Observation data
Epoch J2000      Equinox J2000
Constellation Scorpius
Right ascension 16h 03m 20.62179s[1]
Declination −25° 51′ 54.8653″[1]
Apparent magnitude (V) 4.973[2]
Characteristics
Spectral type K3 III[3]
B−V color index 1.245[3]
Astrometry
Radial velocity (Rv)−37.88±0.15[1] km/s
Proper motion (μ) RA: −66.608[1] mas/yr
Dec.: −38.657[1] mas/yr
Parallax (π)14.3632 ± 0.2020 mas[1]
Distance227 ± 3 ly
(69.6 ± 1.0 pc)
Absolute magnitude (MV)0.909[2]
Details
Mass1.25[3] M☉
Luminosity61.7[3] L☉
Surface gravity (log g)2.29[2] cgs
Temperature4,370±22[3] K
Metallicity [Fe/H]+0.01[2] dex
Age4.46[3] Gyr
Other designations
CD−25° 11295, HD 143787, HIP 78650, HR 5969, SAO 184068[4]
Database references
SIMBADdata

HD 143787 is a single[5] star in the southern constellation of Scorpius. It is a fifth magnitude star – apparent visual magnitude of 4.973,[2] and hence is visible to the unaided eye. The distance to HD 143787 can be estimated from its annual parallax shift of 14.4 mas,[1] yielding a separation of 227 light years. It is moving closer to Earth with a heliocentric radial velocity of −37.9 km/s,[1] and should come within 106.4 ly in 1.2 million years.[6]

This is an evolved giant star with a stellar classification of K3 III.[3] It is a red clump giant, which means it is on the horizontal branch and is generating energy through helium fusion at its core.[2] At the age of 4.46[3] billion years, it has 1.25[3] times the mass of the Sun and is radiating 61.7[3] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,370 K.[3]

References

  1. 1 2 3 4 5 6 7 8 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.
  2. 1 2 3 4 5 6 Liu, Y. J.; et al. (2007), "The abundances of nearby red clump giants", Monthly Notices of the Royal Astronomical Society, 382 (2): 553–66, Bibcode:2007MNRAS.382..553L, doi:10.1111/j.1365-2966.2007.11852.x.
  3. 1 2 3 4 5 6 7 8 9 10 11 Luck, R. Earle (2015), "Abundances in the Local Region. I. G and K Giants", Astronomical Journal, 150 (3), 88, arXiv:1507.01466, Bibcode:2015AJ....150...88L, doi:10.1088/0004-6256/150/3/88, S2CID 118505114
  4. ↑ "HD 143787". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-03.
  5. ↑ Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
  6. ↑ 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, S2CID 119257644.
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