Fomalhaut

Fomalhaut
	; 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
Declination	−29° 37′ 20.050″
Apparent magnitude (V)	1.16
	TW Piscis Austrini
Richt ascension	22h 56m 24.05327s
Declination	−31° 33′ 56.0351″
Apparent magnitude (V)	6.48
	LP 876-10
Richt ascension	22h 48m 04.47s
Declination	−24° 22′ 07.5″
Apparent magnitude (V)	12.618
Chairactereestics
Spectral type	A3 V / K5Vp / M4V
U−B colour index	0.08 / 1.02 / ?
B−V colour index	0.09 / 1.10 / 1.683
Variable teep	None / BY Draconis / ?
Astrometry
Fomalhaut
Radial velocity (Rv)	+6.5 km/s
Proper motion (μ)	RA: +328.95 mas/yr ; Dec.: −164.67 mas/yr
Parallax (π)	129.81 ± 0.47 mas
Distance	25.13 ± 0.09 ly ; (7.70 ± 0.03 pc)
Absolute magnitude (MV)	1.72
TW Piscis Austrini
Radial velocity (Rv)	+6 km/s
Proper motion (μ)	RA: −331.11 mas/yr ; Dec.: −158.98 mas/yr
Parallax (π)	131.42 ± 0.62 mas
Distance	24.8 ± 0.1 ly ; (7.61 ± 0.04 pc)
Absolute magnitude (MV)	7.08
Details
Fomalhaut
Mass	1.92±0.02 M☉
Radius	1.842±0.019 R☉
Luminosity	16.63±0.48 L☉
Surface gravity (log g)	4.21 cgs
Temperatur	8,590 K
Metallicity [Fe/H]	−0.03 tae −0.34 dex
Rotational velocity (v sin i)	93 km/s
Age	(4.4±0.4)×108 years
TW Piscis Austrini
Mass	0.725 ± 0.036 M☉
Radius	0.629 ± 0.051 R☉
Luminosity	0.19 L☉
Temperatur	4,711 ± 134 K
Rotational velocity (v sin i)	2.93 km/s
Age	4.4 × 108 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

1 2 3 4 5 6 7 8 9 10 van Leeuwen, F. (November 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.
1 2 "V* TW PsA -- Variable of BY Dra type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 20 Januar 2010.
1 2 3 4 5 "LP 876-10 -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 30 Julie 2014.
1 2 3 4 5 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:0906.0602, Bibcode:2009A&A...505..205D, doi:10.1051/0004-6361/200911976
1 2 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.CS1 maint: multiple names: authors leet (link)
1 2 3 4 5 6 7 8 9 Mamajek, E.E. (August 2012). "On the Age and Binarity of Fomalhaut". Astrophysical Journal Letters. 754 (2): L20. arXiv:1206.6353. Bibcode:2012ApJL..754...20M. doi:10.1088/2041-8205/754/2/L20.
1 2 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.CS1 maint: multiple names: authors leet (link) This paper lists [Fe/H] = −0.10 dex.
↑ Dunkin, S. K.; Barlow, M. J.; Ryan, Sean G.; Barlow; Ryan (Apryle 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.CS1 maint: multiple names: authors leet (link) This paper lists [Fe/H] = −0.03 dex.
↑ Saffe, C.; Gómez, M.; Pintado, O.; González, E. (October 2008). "Spectroscopic metallicities of Vega-like stars". Astronomy and Astrophysics. 490 (1): 297–305. arXiv:0805.3936. Bibcode:2008A&A...490..297S. doi:10.1051/0004-6361:200810260.CS1 maint: multiple names: authors leet (link) This paper lists [Fe/H] = −0.34 dex.

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

[aaa474_2_653-1] 1 2 3 4 5 6 7 8 9 10 van Leeuwen, F. (November 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.

[SIMBAD-2] 1 2 "V* TW PsA -- Variable of BY Dra type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 20 Januar 2010.

[SIMBAD-fomC-3] 1 2 3 4 5 "LP 876-10 -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 30 Julie 2014.

[aaa505_1_205-4] 1 2 3 4 5 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:0906.0602, Bibcode:2009A&A...505..205D, doi:10.1051/0004-6361/200911976

[clpl4-5] 1 2 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.CS1 maint: multiple names: authors leet (link)

[age_mam-6] 1 2 3 4 5 6 7 8 9 Mamajek, E.E. (August 2012). "On the Age and Binarity of Fomalhaut". Astrophysical Journal Letters. 754 (2): L20. arXiv:1206.6353. Bibcode:2012ApJL..754...20M. doi:10.1088/2041-8205/754/2/L20.

[aaa426-7] 1 2 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.CS1 maint: multiple names: authors leet (link) This paper lists [Fe/H] = −0.10 dex.

[mnras286_3-8] Dunkin, S. K.; Barlow, M. J.; Ryan, Sean G.; Barlow; Ryan (Apryle 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.CS1 maint: multiple names: authors leet (link) This paper lists [Fe/H] = −0.03 dex.

[aaa490_1-9] Saffe, C.; Gómez, M.; Pintado, O.; González, E. (October 2008). "Spectroscopic metallicities of Vega-like stars". Astronomy and Astrophysics. 490 (1): 297–305. arXiv:0805.3936. Bibcode:2008A&A...490..297S. doi:10.1051/0004-6361:200810260.CS1 maint: multiple names: authors leet (link) This paper lists [Fe/H] = −0.34 dex.

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Observation data Epoch J2000 Equinox J2000
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)
Constellation	Piscis Austrinus (Fomalhaut A+B), Aquarius (Fomalhaut C)
Fomalhaut
Richt ascension	22^h 57^m 39.0465^s^[1]
Declination	−29° 37′ 20.050″^[1]
Apparent magnitude (V)	1.16
TW Piscis Austrini
Richt ascension	22^h 56^m 24.05327^s^[1]
Declination	−31° 33′ 56.0351″^[1]
Apparent magnitude (V)	6.48^[2]
LP 876-10
Richt ascension	22^h 48^m 04.47^s^[3]
Declination	−24° 22′ 07.5″^[3]
Apparent magnitude (V)	12.618^[3]
Chairactereestics
Spectral type	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 (R_v)	+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 (M_V)	1.72^[6]
TW Piscis Austrini
Radial velocity (R_v)	+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 (M_V)	7.08^[6]
Details
Fomalhaut
Mass	7000192000000000000♠1.92±0.02^[6] M_☉
Radius	7000184200000000000♠1.842±0.019^[6] R_☉
Luminosity	7001166300000000000♠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	7008440000000000000♠(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