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Fomalhaut
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Fomalhaut
DSS image of Fomalhaut, field of view 2.7×2.9 degrees.
Credit NASA, ESA, and the Digitized 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
Right ascension
22h 57m 39.0465s
Declination
-29° 37' 20.050?
Apparent magnitude (V)
1.16
TW Piscis Austrini
Right ascension
22h 56m 24.05327s
Declination
-31° 33' 56.0351?
Apparent magnitude (V)
6.48
LP 876-10
Right ascension
22h 48m 04.47s
Declination
-24° 22' 07.5?
Apparent magnitude (V)
12.618
Characteristics
Spectral type
A3 V / K5Vp / M4V
U-B color index
0.08 / 1.02 / ?
B-V color index
0.09 / 1.10 / 1.683
Variable type
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 (p)
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 (p)
131.42 ± 0.62 mas
Distance
24.8 ± 0.1 ly
(7.61 ± 0.04 pc)
Absolute magnitude (MV)
7.08
Details
Fomalhaut
Mass
7000192000000000000?1.92±0.02 M?
Radius
7000184200000000000?1.842±0.019 R?
Luminosity
7001166300000000000?16.63±0.48 L?
Surface gravity (log g)
4.21 cgs
Temperature
8,590 K
Metallicity
-0.03 to -0.34 dex
Rotational velocity (v sin i)
93 km/s
Age
7008440000000000000?(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?
Temperature
4,711 ± 134 K
Rotational velocity (v sin i)
2.93 km/s
Age
4.4 × 108 years
Other designations
Fomalhaut: a Piscis Austrini, a 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
SIMBAD
AC
AB
A (Fomalhaut)
B (TW PsA)
C (LP 876-10)
planet b
Exoplanet Archive
data
ARICNS
A (Fomalhaut)
B (TW PsA)
Extrasolar Planets
Encyclopaedia
data
Fomalhaut (Alpha Piscis Austrini, Alpha PsA, a Piscis Austrini, a PsA) is the brightest star in the constellation Piscis Austrinus and one of the brightest stars in the sky. It is a class A star on the main sequence approximately 25 light-years (7.7 pc) from Earth as measured by the Hipparcos astrometry satellite. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. It is classified as a Vega-like star that emits excess infrared radiation, indicating it is surrounded by a circumstellar disk. Fomalhaut, K-type star TW Piscis Austrini and M-type star LP 876-10 constitute a triple system even though the companions are separated by several degrees.Fomalhaut holds a special significance in extrasolar planet research, as it is the center of the first stellar system with an extrasolar planet candidate (Fomalhaut b) imaged at visible wavelengths. The image was published in Science in November 2008. Fomalhaut is the third brightest star (as viewed from Earth) known to have a planetary system, after the Sun and Pollux.
^ Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
^ Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D.
^ a b "V* TW PsA -- Variable of BY Dra type". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-01-20.
^ a b c d e "LP 876-10 -- Double or multiple star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2014-07-30.
^ Cite error: The named reference aaa505_1_205 was invoked but never defined (see the help page).
^ a b 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): 99. Bibcode:1966CoLPL...4...99J.
^ Cite error: The named reference age_mam was invoked but never defined (see the help page).
^ Cite error: The named reference aaa426 was invoked but never defined (see the help page).
^ Cite error: The named reference mnras286_3 was invoked but never defined (see the help page).
^ Cite error: The named reference aaa490_1 was invoked but never defined (see the help page).
^ Cite error: The named reference GSM was invoked but never defined (see the help page).
^ Cite error: The named reference baas25_1319 was invoked but never defined (see the help page).
^ Cite error: The named reference vegalikedisc was invoked but never defined (see the help page).
^ Cite error: The named reference Mamajek2013 was invoked but never defined (see the help page).
^ Cite error: The named reference Kalas2008 was invoked but never defined (see the help page).
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