Fomalhaut

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Fomalhaut
Heic0821f.jpg
DSS image o Fomalhaut, field o view 2.7×2.9 degrees.
Credit NASA, ESA, an the Deegitised Sky Survey 2. Acknowledgment: Davide De Martin (ESA/Hubble)
Observation data
Epoch J2000      Equinox J2000
Constellation Piscis Austrinus (Fomalhaut A+B), Aquarius (Fomalhaut C)
Fomalhaut
Richt ascension 22h 57m 39.0465s[1]
Declination −29° 37′ 20.050″[1]
Apparent magnitude (V) 1.16
TW Piscis Austrini
Richt ascension 22h 56m 24.05327s[1]
Declination −31° 33′ 56.0351″[1]
Apparent magnitude (V) 6.48[2]
LP 876-10
Richt ascension 22h 48m 04.47s[3]
Declination −24° 22′ 07.5″[3]
Apparent magnitude (V) 12.618[3]
Characteristics
Spectral teep A3 V / K5Vp / M4V[3][4]
U−B colour index 0.08 / 1.02 / ?[5]
B−V colour index 0.09 / 1.10 / 1.683[3][5]
Variable teep None / BY Draconis / ?
Astrometry
Fomalhaut
Radial velocity (Rv) +6.5 km/s
Proper motion (μ) RA: +328.95[1] mas/yr
Dec.: −164.67[1] mas/yr
Parallax (π) 129.81 ± 0.47[1] mas
Distance 25.13 ± 0.09 ly
(7.70 ± 0.03 pc)
Absolute magnitude (MV) 1.72[6]
TW Piscis Austrini
Radial velocity (Rv) +6[2] km/s
Proper motion (μ) RA: −331.11[1] mas/yr
Dec.: −158.98[1] mas/yr
Parallax (π) 131.42 ± 0.62[1] mas
Distance 24.8 ± 0.1 ly
(7.61 ± 0.04 pc)
Absolute magnitude (MV) 7.08[6]
Details
Fomalhaut
Mass 1.92±0.02[6] M
Radius 1.842±0.019[6] R
Luminosity 16.63±0.48[6] L
Surface gravity (log g) 4.21[7] cgs
Temperatur 8,590[6] K
Metallicity [Fe/H] −0.03[8] tae −0.34[9] dex
Rotational velocity (v sin i) 93[7] km/s
Age (4.4±0.4)×108[6] years
TW Piscis Austrini
Mass 0.725 ± 0.036[4] M
Radius 0.629 ± 0.051[4] R
Luminosity 0.19[6] L
Temperatur 4,711 ± 134[4] K
Rotational velocity (v sin i) 2.93[4] km/s
Age 4.4 × 108[6] years
Ither designations
Fomalhaut: α Piscis Austrini, α PsA, Alpha PsA, 24 Piscis Austrini, CPD −30° 6685, FK5 867, Gl 881, HD 216956, HIP 113368, HR 8728, SAO 191524
TW Piscis Austrini: Fomalhaut B, TW PsA, Gl 879, HR 8721, CD -32°17321, HD 216803, LTT 9283, GCTP 5562.00, SAO 214197, CP(D)-32 6550, HIP 113283
LP 876-10: Fomalhaut C, 2MASS J22480446-2422075, NLTT 54872, GSC 06964-01226
Database references
Fomalhaut
SIMBAD data
Exoplanet Archive data
ARICNS data
Extrasolar Planets
Encyclopaedia
data
TW Piscis Austrini
SIMBAD data
ARICNS data

Fomalhaut (Alpha Piscis Austrini, Alpha PsA, α Piscis Austrini, α PsA) is the brichtest starn in the constellation Piscis Austrinus an ane o the brichtest starns in the sky.

References[eedit | eedit soorce]

  1. 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. 2.0 2.1 "V* TW PsA -- Variable of BY Dra type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-01-20. 
  3. 3.0 3.1 3.2 3.3 3.4 "LP 876-10 -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2014-07-30. 
  4. 4.0 4.1 4.2 4.3 4.4 Demory, B.-O.; et al. (October 2009), "Mass-radius relation of low and very low-mass stars revisited with the VLTI", Astronomy and Astrophysics, 505 (1): 205–215, arXiv:0906.0602Freely accessible, Bibcode:2009A&A...505..205D, doi:10.1051/0004-6361/200911976 
  5. 5.0 5.1 Johnson, H. L.; Iriarte, B.; Mitchell, R. I.; Wisniewskj, W. Z. (1966). "UBVRIJKL photometry of the bright stars". Communications of the Lunar and Planetary Laboratory. 4 (99). Bibcode:1966CoLPL...4...99J. 
  6. 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 6.8 Mamajek, E.E. (August 2012). "On the Age and Binarity of Fomalhaut". Astrophysical Journal Letters. 754 (2): L20. arXiv:1206.6353Freely accessible. Bibcode:2012ApJL..754...20M. doi:10.1088/2041-8205/754/2/L20. 
  7. 7.0 7.1 Di Folco, E.; Thévenin, F.; Kervella, P.; Domiciano de Souza, A.; Coudé du Foresto, V.; Ségransan, D.; Morel, P. (November 2004). "VLTI near-IR interferometric observations of Vega-like stars. Radius and age of α PsA, β Leo, β Pic, ɛ Eri and τ Cet". Astronomy and Astrophysics. 426 (2): 601–617. Bibcode:2004A&A...426..601D. doi:10.1051/0004-6361:20047189.  This paper lists [Fe/H] = −0.10 dex.
  8. Dunkin, S. K.; Barlow, M. J.; Ryan, Sean G.; Barlow; Ryan (Aprile 1997). "High-resolution spectroscopy of Vega-like stars - I. Effective temperatures, gravities and photospheric abundances". Monthly Notices of the Royal Astronomical Society. 286 (3): 604–616. Bibcode:1997MNRAS.286..604D. doi:10.1093/mnras/286.3.604.  This paper lists [Fe/H] = −0.03 dex.
  9. Saffe, C.; Gómez, M.; Pintado, O.; González, E. (October 2008). "Spectroscopic metallicities of Vega-like stars". Astronomy and Astrophysics. 490 (1): 297–305. arXiv:0805.3936Freely accessible. Bibcode:2008A&A...490..297S. doi:10.1051/0004-6361:200810260.  This paper lists [Fe/H] = −0.34 dex.

Coordinates: Sky map 22h 57m 39.1s, −29° 37′ 20″