40 Aquarii

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40 Aquarii
Observation data
Epoch J2000       Equinox J2000
Constellation Aquarius
Right ascension 22 h 13 m 26.37997 s [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 (R v ) ?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  mas [1]
Distance 726 ± 6  ly
(223 ± 2  pc )
Absolute magnitude  (M V ) ?0.47 [4]
Details [7]
Radius 10.07 +0.44
?0.21 [1]   R ☉
Luminosity 154.44 [4]   L ☉
Surface gravity (log  g ) 2.69 [7]   cgs
Temperature 5,355 ± 80 [7]   K
Metallicity [Fe/H] ?0.13 [7]   dex
Age 100 [7]   Myr
Other designations
40 Aqr , BD ?12° 6209 , HD  210845, HIP  109720, SAO  164935 [8]
Database references
SIMBAD data

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 [ edit ]

  1. ^ a b c d e f 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. ^ a b 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 .
  3. ^ a b 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. ^ a b c d 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 .
  5. ^ a b 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 .
  6. ^ a b 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 .
  7. ^ a b c d e f g 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 .
  8. ^ "* 40 Aqr" . SIMBAD . Centre de donnees astronomiques de Strasbourg . Retrieved 7 August 2017 .
  9. ^ Bidelman, W. P. (1990). "Flamsteed stars not contained in the Yale "Catalogue of Bright Stars" ". Bulletin d'Information du Centre de Donnees 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. Bibcode : 1978AN....299..243B . doi : 10.1002/asna.19782990505 . See p. 256.
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