40 Aquarii

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Short description: Star in the constellation Aquarius
40 Aquarii
Observation data
Equinox J2000.0]] (ICRS)
Constellation Aquarius
Right ascension  22h 13m 26.37997s[1]
Declination −11° 55′ 34.0405″[1]
Apparent magnitude (V) 6.93[2]
Characteristics
Spectral type G5 IV[3]
B−V color index +0.762±0.008[4]
Astrometry
Radial velocity (Rv)−2.9±0.3[5] km/s
Proper motion (μ) RA: +20.95[6] mas/yr
Dec.: −20.05[6] mas/yr
Parallax (π)4.4915 ± 0.0371[1] mas
Distance726 ± 6 ly
(223 ± 2 pc)
Absolute magnitude (MV)−0.47[4]
Details[7]
Radius10.07+0.44
−0.21[1] R☉
Luminosity154.44[4] L☉
Surface gravity (log g)2.69[7] cgs
Temperature5,355±80[7] K
Metallicity [Fe/H]−0.13[7] dex
Age100[7] Myr
Other designations
40 Aqr, BD−12° 6209, HD 210845, HIP 109720, SAO 164935[8]
Database references
SIMBADdata

40 Aquarii is a star in the equatorial constellation of Aquarius. 40 Aquarii is its Flamsteed designation; it was too faint to be included in the Bright Star Catalogue.[9] The brightness of this star is below the normal limit for visibility with the naked eye, having an apparent visual magnitude of 6.93.[2] Based upon parallax measurements, it is located about 726 light-years (223 parsecs) away from the Sun.[1] It is moving closer to the Earth with a heliocentric radial velocity of -3 km/s.[5] 40 Aquarii is positioned near the ecliptic and thus is subject to lunar occultations.[10]

The stellar classification for 40 Aquarii is G5 IV,[3] matching a G-type, yellow-hued subgiant star that has exhausted the supply of hydrogen at its core and has begun to evolve into a giant. It is around 100[7] million years old with 10[1] times the girth of the Sun. The star is radiating 154[4] times the luminosity of the Sun from its photosphere at an effective temperature of 5,355 K.[7]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27–L30. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 Houk, N.; Smith-Moore, M. (1988). "Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars. Volume 4, Declinations -26°.0 to -12°.0.". Michigan Catalogue of Two-dimensional Spectral Types for the HD Stars 4. Bibcode: 1988mcts.book.....H. 
  4. ↑ 4.0 4.1 4.2 4.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A. 
  5. ↑ 5.0 5.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  6. ↑ 6.0 6.1 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. http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%26A...474..653VFUL. 
  7. ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Holmberg, J. et al. (July 2009), "The Geneva-Copenhagen survey of the solar neighbourhood. III. Improved distances, ages, and kinematics", Astronomy and Astrophysics 501 (3): 941–947, doi:10.1051/0004-6361/200811191, Bibcode: 2009A&A...501..941H. 
  8. ↑ "* 40 Aqr". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=*+40+Aqr. 
  9. ↑ Bidelman, W. P. (1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars"". Bulletin d'Information du Centre de Données Stellaires 38: 13. Bibcode: 1990BICDS..38...13B. 
  10. ↑ Boehme, D. (1978). "Derivation of Angular Diameters of Stars from Lunar Occultations". Astronomische Nachrichten 299 (5): 243. doi:10.1002/asna.19782990505. Bibcode: 1978AN....299..243B.  See p. 256.



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Categories: [G-type subgiants] [Aquarius (constellation)] [Durchmusterung objects] [Flamsteed objects] [Henry Draper Catalogue objects] [Hipparcos objects]

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