Fomalhaut
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.
 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 |
References
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