Alpha Fornacis
Alpha Fornacis (α Fornacis, abbreviated Alpha For, α For) is a triple star 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.
Location of α Fornacis (upper left). | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Fornax |
| Right ascension | 3h 12m 04.5277s |
| Declination | –28° 59′ 15.425″ |
| Apparent magnitude (V) | 3.85 (3.98/7.19) |
| Characteristics | |
| Spectral type | F8IV |
| U−B color index | +0.082 |
| B−V color index | +0.581 |
| Astrometry | |
| Radial velocity (Rv) | –20.5 km/s |
| Proper motion (μ) | RA: 371.49 mas/yr Dec.: 612.28 mas/yr |
| Parallax (π) | 71.4337 ± 0.1320 mas |
| Distance | 45.66 ± 0.08 ly (14.00 ± 0.03 pc) |
| Absolute magnitude (MV) | 3.08 |
| Orbit | |
| 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 M☉ |
| Radius | 2.04 ± 0.06 R☉ |
| Luminosity | 4.87 ± 0.16 L☉ |
| Surface gravity (log g) | 4.27 cgs |
| Temperature | 6,240 K |
| Metallicity [Fe/H] | –0.20 dex |
| Rotational velocity (v sin i) | 3.9 km/s |
| Age | 2.9 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Its the omponents are designated Alpha Fornacis A (officially named Dalim /ˈdeɪlɪm/), Alpha Fornacis B and Alpha Fornacis Bb.
This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.