Star in the constellation Aquarius
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 apparent visual magnitude of 6.93. Based upon parallax measurements , it is located about 726 light-years (223 parsecs ) away from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of -3 km/s. 40 Aquarii is positioned near the ecliptic and thus is subject to lunar occultations .
The stellar classification for 40 Aquarii is G5 IV, 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 million years old with 10 times the girth of the Sun. The star is radiating 154 times the luminosity of the Sun from its photosphere at an effective temperature of 5,355 K.
References
^ 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 .
^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics . 355 : L27 – L30. Bibcode :2000A&A...355L..27H .
^ 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 .
^ 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 .
^ Gontcharov, G. A. (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 .
^ 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 .
^ 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, arXiv :0811.3982 , Bibcode :2009A&A...501..941H , doi :10.1051/0004-6361/200811191 , S2CID 118577511 .
"* 40 Aqr" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 7 August 2017.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 .
Boehme, D. (1978). "Derivation of Angular Diameters of Stars from Lunar Occultations". Astronomische Nachrichten . 299 (5): 243. Bibcode :1978AN....299..243B . doi :10.1002/asna.19782990505 . See p. 256.
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