43 Sagittarii

43 Sagittarii is a single[10] star in the southern constellation of Sagittarius. It has the Bayer designation d Sagittarii, while 43 Sagittarii is the Flamsteed designation.[9] This object is visible to the naked eye as a faint, yellow-hued star with an apparent visual magnitude of 4.88.[2] From parallax measurements, it is estimated to lie around 470 light years away from the Sun.[1] The star is drifting further from the Earth with a heliocentric radial velocity of +15.2 km/s.[5] It is located near the ecliptic and thus is subject to lunar occultations.[11]

This article is about d Sagittarii. It is not to be confused with δ (delta) Sagittarii.
43 Sagittarii
Location of 43 Sagittarii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Sagittarius
Right ascension  19h 17m 38.07906s[1]
Declination −18° 57′ 10.4626″[1]
Apparent magnitude (V) 4.88[2]
Characteristics
Spectral type G8II-III[3]
U−B color index +0.81[4]
B−V color index +1.02[4]
Astrometry
Radial velocity (Rv)+15.20[5] km/s
Proper motion (μ) RA: −10.341[1] mas/yr
Dec.: −10.892[1] mas/yr
Parallax (π)6.9681 ± 0.1875[1] mas
Distance470 ± 10 ly
(144 ± 4 pc)
Absolute magnitude (MV)-0.96[2]
Details[6]
Mass3.30 M☉
Radius23.99 R☉
Luminosity277 L☉
Surface gravity (log g)2.22 cgs
Temperature4,813 K
Metallicity [Fe/H]−0.18 dex
Rotational velocity (v sin i)4.2[7] km/s
Age350±100[8] Myr
Other designations
d Sgr, 43 Sgr, BD−19°5379, GC 26589, HD 180540, HIP 94820, HR 7304, SAO 162413, GSC 06304-00334[9]
Database references
SIMBADdata

This is an aging giant/bright giant star with a stellar classification of G8II-III,[3] and is most likely (97% chance) on the horizontal branch.[8] It is around 350[8] million years old with 3.3[6] times the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star has expanded to 24[6] times the Sun's radius and is now generating energy through core helium fusion. It is radiating 277 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,813 K.[6]

References
  1. 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.
  2. 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. Vizier catalog entry
  3. Hoffleit, D.; Warren, W. H. (1995). "Bright Star Catalogue". VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H (5th Revised ed.). 5050. Bibcode:1995yCat.5050....0H.
  4. Mermilliod, J. C. (2006). "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.Vizier catalog entry
  5. Wilson, R. E. (1953). General Catalogue of Stellar Radial Velocities. Carnegie Institution for Science. Bibcode:1953GCRV..C......0W. LCCN 54001336.
  6. Reffert, Sabine; et al. (2015). "Precise radial velocities of giant stars". Astronomy & Astrophysics. 574: A116. arXiv:1412.4634. Bibcode:2015A&A...574A.116R. doi:10.1051/0004-6361/201322360. hdl:10722/215277. Vizier catalog entry
  7. De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics. 561: A126. arXiv:1312.3474. Bibcode:2014A&A...561A.126D. doi:10.1051/0004-6361/201220762. Vizier catalog entry
  8. Stock, Stephan; et al. (August 2018), "Precise radial velocities of giant stars. X. Bayesian stellar parameters and evolutionary stages for 372 giant stars from the Lick planet search", Astronomy & Astrophysics, 616: 15, arXiv:1805.04094, Bibcode:2018A&A...616A..33S, doi:10.1051/0004-6361/201833111, A33.
  9. "d Sgr". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-07-22.
  10. Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  11. Richichi, A.; et al. (May 1996). "New binary stars discovered by lunar occultations. II". Astronomy and Astrophysics. 309: 163–170. Bibcode:1996A&A...309..163R.
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