1 Centauri
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | +4.23[2] |
| Characteristics | |
| Spectral type | F2 V[3] |
| U−B Template:Engvar | +0.00[4] |
| B−V Template:Engvar | +0.38[4] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[5] km/s |
| Proper motion (μ) | RA: Script error: No such module "val".[1] mas/yr Dec.: Script error: No such module "val".[1] mas/yr |
| Parallax (π) | 51.54±0.19 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +2.81[6] |
| Orbit[7] | |
| Period (P) | Script error: No such module "val". |
| Eccentricity (e) | Script error: No such module "val". |
| Periastron epoch (T) | 2,422,737.382 ± 3.35 JD |
| Argument of periastron (ω) (secondary) | Script error: No such module "val".° |
| Semi-amplitude (K1) (primary) | Script error: No such module "val". km/s |
| Details | |
| Mass | 1.35[6] Template:Solar mass |
| Luminosity (bolometric) | 5.857[8] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[9] cgs |
| Temperature | Script error: No such module "val".[9] K |
| Metallicity [Fe/H] | −0.09[8] dex |
| Rotation | Script error: No such module "val".[8] |
| Rotational velocity (v sin i) | 86[6] km/s |
| Age | 1.193[9] Gyr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[10] | |
| Database references | |
| SIMBAD | data |
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1 Centauri, or i Centauri,[10] is a yellow-white-hued binary star[7] system in the southern constellation Centaurus. It can be seen with the naked eye, having an apparent visual magnitude of +4.23.[2] Based upon an annual parallax shift of 51.54 mas as seen from Earth's orbit, it is located 63.3 light-years from the Sun. The system is moving closer to the Sun with a radial velocity of −21.5 km/s.[5]
Spectrographic images taken at the Cape Observatory between 1921 and 1923 showed this star has a variable radial velocity, which indicated this is a single-lined spectroscopic binary star system. The pair have an orbital period of 9.94 days and an eccentricity of about 0.2.[7]
The primary component has received a number of different stellar classifications. For example, Jaschek et al. (1964) lists F0V, F2III, F4III and F4IV, thus ranging in evolutionary state from an ordinary F-type main-sequence star to a giant star.[11] More recently, Houk (1982) listed a class of F3 V,[12] matching an ordinary main-sequence star that is generating energy through hydrogen fusion at its core. The NStars project gives it a classification of F2 V.[3]
References
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- ↑ a b c d e Script error: No such module "Citation/CS1". Vizier catalog entry
- ↑ a b Script error: No such module "citation/CS1".
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- ↑ a b Template:Cite simbad
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