3 Centauri
Template:Short description Template:About-distinguish
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.32[2] (4.52 + 5.97)[3] |
| Characteristics | |
| Spectral type | B5 III-IVp[4] + B8 V[5] |
| B−V Template:Engvar | Script error: No such module "val".[2] |
| Variable type | Eclipsing?[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Absolute magnitude (MV) | −0.46[2] |
| A | |
| Proper motion (μ) | RA: Script error: No such module "val".[8] mas/yr Dec.: Script error: No such module "val".[8] mas/yr |
| Parallax (π) | 11.0982±0.4267 mas |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| B | |
| Proper motion (μ) | RA: Script error: No such module "val".[9] mas/yr Dec.: Script error: No such module "val".[9] mas/yr |
| Parallax (π) | 10.2659±0.1380 mas[9] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Orbit[10] | |
| Primary | Ba |
| Companion | Bb |
| Period (P) | 17.428 d |
| Eccentricity (e) | 0.21 |
| Periastron epoch (T) | 2443296.44 JD |
| Argument of periastron (ω) (secondary) | 15° |
| Semi-amplitude (K1) (primary) | 17 km/s |
| Details | |
| 3 Cen A | |
| Mass | Script error: No such module "val".[11] Template:Solar mass |
| Surface gravity (log g) | 3.80[12] cgs |
| Temperature | 17,500[12] K |
| Age | Script error: No such module "val".[11] Myr |
| 3 Cen B | |
| Mass | Script error: No such module "val".[5] Template:Solar mass |
| Radius | 2.8[13] Template:Solar radius |
| Luminosity | Script error: No such module "val".[5] Template:Solar luminosity |
| Temperature | Script error: No such module "val".[5] K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Rotational velocity (v sin i) | 135[5] km/s |
| Other designations | |
| Template:Odlist[14] | |
| 3 Cen A: Template:Odlist | |
| 3 Cen B: Template:Odlist | |
| Database references | |
| SIMBAD | data |
| A | |
| B | |
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3 Centauri is a triple star[3] system in the southern constellation of Centaurus,[14] located approximately 300 light years from the Sun.[8][9] It is visible to the naked eye as a faint, blue-white hued star with a combined apparent visual magnitude of 4.32.[2] As of 2017, the two visible components had an angular separation of Script error: No such module "val". along a position angle of 106°.[3] The system has the Bayer designation k Centauri; 3 Centauri is the Flamsteed designation. It was a suspected eclipsing binary with a variable star designation V983 Centauri,[6] however the AAVSO website lists it as non-variable, formerly suspected to be variable.[15]
The brighter member, designated component A, is a magnitude 4.52[3] chemically peculiar star of the helium-weak (CP4) variety, and has a stellar classification of B5 III-IVp.[4] The spectrum of the star displays overabundances of elements such as nitrogen, phosphorus, manganese, iron, and nickel, while carbon, oxygen, magnesium, aluminium, sulfur, and chlorine appear underabundant relative to the Sun.[12] Weak emission line features are also visible.[16]
The magnitude 5.97[3] secondary, component B, is a single-lined spectroscopic binary star system with an orbital period of 17.4 days and an eccentricity of 0.21.[10] The pair have an angular separation of Script error: No such module "val".. The visible component is a B-type main-sequence star with a class of B8 V.[5]
References
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- ↑ a b Template:Cite simbad
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