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.
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] |
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 (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 | ±0.02 1.92[6] M☉ |
Radius | ±0.019 1.842[6] R☉ |
Luminosity | ±0.48 16.63[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 | ±0.4)×108 (4.4[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 |
References
Wikiwand in your browser!
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.