Gliese 318

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Gliese 318
Observation data
Epoch J2000      Equinox J2000
Constellation Pyxis
Right ascension  08h 41m 32.50s[1]
Declination –32° 56′ 34.0″[1]
Apparent magnitude (V) 11.85[2]
Characteristics
Spectral type DA5.5
U−B color index −0.59[1]
B−V color index +0.25[3]
Astrometry
Radial velocity (Rv)+29.3 ± 2.9 km/s
Proper motion (μ) RA: –1100 ± 9 mas/yr
Dec.: 1340 ± 8 mas/yr
Parallax (π)113.63 ± 1.97[4] mas
Distance28.7 ± 0.5 ly
(8.8 ± 0.2 pc)
Absolute magnitude (MV)12.14 ± 0.05[4]
Details
Mass0.45 ± 0.01[4] M
Luminosity0.0015[4] L
Temperature9120 ± 190[4] K
Age550 ± 20 million[4] years
Other designations
GJ 318, CD−32° 5613, LHS 253, L 532-81, LTT 3218, WD 0839-327
Database references
SIMBADdata
ARICNSdata

Gliese 318 is a white dwarf in the constellation Pyxis. Its spectral type is DA5.5 and it has a visual magnitude of 11.85,[2] which lies 26 light years away.[5] The star was too faint to have had its parallax measured by the Hipparcos satellite. Earth-based measurement gives its parallax as 113.63 ± 1.97 milliarcseconds, yielding a distance of 28.7 ± 0.5 light-years.[4] It is around 45% as massive as the Sun but has only 0.15% its luminosity.[4]

References[edit]

  1. ^ a b c Cutri, R. M. (2003). "2MASS All-Sky Catalog of Point Sources". VizieR On-line Data Catalog. Bibcode:2003yCat.2246....0C.
  2. ^ a b Pancino, E.; Altavilla, G.; Marinoni, S.; Cocozza, G.; Carrasco, J. M.; Bellazzini, M.; Bragaglia, A.; Federici, L.; Rossetti, E.; Cacciari, C.; Balaguer Núñez, L.; Castro, A.; Figueras, F.; Fusi Pecci, F.; Galleti, S.; Gebran, M.; Jordi, C.; Lardo, C.; Masana, E.; Monguió, M.; Montegriffo, P.; Ragaini, S.; Schuster, W.; Trager, S.; Vilardell, F.; Voss, H. (2012). "The Gaia spectrophotometric standard stars survey - I. Preliminary results". Monthly Notices of the Royal Astronomical Society. 426 (3): 1767–81. arXiv:1207.6042. Bibcode:2012MNRAS.426.1767P. doi:10.1111/j.1365-2966.2012.21766.x.
  3. ^ Mermilliod, J.-C. (1986). "Compilation of Eggen's UBV data, transformed to UBV (unpublished)". Bibcode:1986EgUBV........0M. Cite journal requires |journal= (help)
  4. ^ a b c d e f g h Subasavage, John P.; Jao, Wei-Chun; Henry, Todd J.; Bergeron, P.; Dufour, P.; Ianna, Philip A.; Costa, Edgardo; Méndez, René A. (2009). "The Solar Neighborhood. XXI. Parallax Results from the CTIOPI 0.9 m Program: 20 New Members of the 25 Parsec White Dwarf Sample". The Astronomical Journal. 137 (6): 4547–60. arXiv:0902.0627. Bibcode:2009AJ....137.4547S. doi:10.1088/0004-6256/137/6/4547.
  5. ^ Sion, Edward M. (2009). "1.The White Dwarfs Within 20 Parsecs of the Sun: Kinematics and Statistics". The Astronomical Journal. 138 (6): 1681. arXiv:0910.1288. Bibcode:2009AJ....138.1681S. doi:10.1088/0004-6256/138/6/1681.