Alpha Fornacis
Star in the constellation Fornax / From Wikipedia, the free encyclopedia
Alpha Fornacis (α Fornacis, abbreviated Alpha For, α For) is a triple star[12] system in the southern constellation of Fornax. It is the brightest star in the constellation and the only one brighter than magnitude 4.0. Based on parallax measurements obtained during the Hipparcos mission, it is approximately 46 light-years (14 parsecs) distant from the Sun.
Quick Facts Observation data Epoch J2000 Equinox J2000, Constellation ...
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Fornax |
Right ascension | 3h 12m 04.5277s[1] |
Declination | –28° 59′ 15.425″[1] |
Apparent magnitude (V) | 3.85[2] (3.98/7.19)[3] |
Characteristics | |
Spectral type | F8IV[4] |
U−B color index | +0.082[5] |
B−V color index | +0.581[5] |
Astrometry | |
Radial velocity (Rv) | –20.5[6] km/s |
Proper motion (μ) | RA: 371.49[1] mas/yr Dec.: 612.28[1] mas/yr |
Parallax (π) | 71.4337 ± 0.1320 mas[7] |
Distance | 45.66 ± 0.08 ly (14.00 ± 0.03 pc) |
Absolute magnitude (MV) | 3.08[8] |
Orbit[3] | |
Period (P) | 269 yr |
Semi-major axis (a) | 4.0″ |
Eccentricity (e) | 0.73 |
Inclination (i) | 81° |
Longitude of the node (Ω) | 117° |
Periastron epoch (T) | 1947 |
Argument of periastron (ω) (secondary) | 43° |
Details | |
α For A | |
Mass | 1.33 ± 0.01[9] M☉ |
Radius | 2.04 ± 0.06[10] R☉ |
Luminosity | 4.87 ± 0.16[10] L☉ |
Surface gravity (log g) | 4.27[9] cgs |
Temperature | 6,240[9] K |
Metallicity [Fe/H] | –0.20[9] dex |
Rotational velocity (v sin i) | 3.9[10] km/s |
Age | 2.9[11] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
Close
Its three components are designated Alpha Fornacis A (officially named Dalim /ˈdeɪlɪm/),[13] Alpha Fornacis Ba and Alpha Fornacis Bb.