Delta Librae
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Libra |
| Right ascension | Template:RA[2] |
| Declination | Template:DEC[2] |
| Apparent magnitude (V) | 4.93[3] |
| Characteristics | |
| Spectral type | B9.5V[4] |
| U−B Template:Engvar | −0.10[5] |
| B−V Template:Engvar | +0.00[5] |
| Variable type | Algol eclipsing[6] |
| Astrometry | |
| Radial velocity (Rv) | Script error: No such module "val".[7] km/s |
| Proper motion (μ) | RA: −63.051[2] mas/yr Dec.: −6.024[2] mas/yr |
| Parallax (π) | 9.2824±0.4725 mas[2] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +0.15[8] |
| Orbit | |
| Period (P) | 2.3273543 days[9] |
| Semi-major axis (a) | Script error: No such module "val".[9] |
| Eccentricity (e) | 0.07[10] |
| Semi-amplitude (K1) (primary) | 76.6[10] km/s |
| Semi-amplitude (K2) (secondary) | 218.7[10] km/s |
| Details[9] | |
| δ Lib A | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Temperature | Script error: No such module "val". K |
| Age | 0.5[11] Gyr |
| δ Lib B | |
| Mass | Script error: No such module "val". Template:Solar mass |
| Radius | Script error: No such module "val". Template:Solar radius |
| Luminosity | Script error: No such module "val". Template:Solar luminosity |
| Temperature | Script error: No such module "val". K |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| δ Lib, Zuben Elakribi, 19 Librae, BD−07°3938, HD 132742, HIP 73473, HR 5586, SAO 140270 | |
| Database references | |
| SIMBAD | data |
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Delta Librae, Latinized from δ Librae, is a variable star in the constellation Libra. It has the traditional name Zuben Elakribi, a variant of the traditional name of Gamma Librae.[12] With μ Virginis it forms one of the Akkadian lunar mansions Mulu-izi[13](meaning "Man-of-fire"[14]).
δ Librae is approximately 350 light years from the Earth and the primary, component A, belongs to the spectral class B9.5V, indicating it is a B-type main-sequence star. It is visible to the naked eye with an apparent visual magnitude of 4.93[3] and is moving closer to the Sun with a radial velocity of −39 km/s.[7] This is an Algol-like eclipsing binary star system, with a period of 2.3274 days and an eccentricity of 0.07.[10] Its apparent magnitude varies from 4.91 to 5.90.[15] The secondary is filling its Roche lobe and there is evidence of large-scale mass transfer in the past, with the secondary being more evolved than the primary despite now being less massive.[10]
Along with λ Tauri, it was one of the first stars on which rotational line broadening was observed, by Frank Schlesinger in 1911.[16]
References
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