Zeta Sculptoris
Star in the constellation Sculptor
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Zeta Sculptoris, Latinized from ζ Sculptoris, is a multiple star system in the constellation Sculptor. It is faintly visible to the naked eye with an apparent magnitude of 5.04.[2] The annual parallax shift is 6.49 mas, which yields a distance estimate of about 500 light years from the Sun. It is moving further away with a radial velocity of +8.6 km/s.[5] Zeta Sculptoris is near the Blanco 1 cluster as viewed from Earth, although parallax measurements indicate it to be substantially closer.[6]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 00h 02m 19.92035s[1] |
| Declination | −29° 43′ 13.4873″[1] |
| Apparent magnitude (V) | 5.04[2] |
| Characteristics | |
| Spectral type | B5 V[3] |
| U−B color index | -0.55[4] |
| B−V color index | -0.16[4] |
| Astrometry | |
| Radial velocity (Rv) | +8.6±1.6[5] km/s |
| Proper motion (μ) | RA: +9.34[1] mas/yr Dec.: +14.50[1] mas/yr |
| Parallax (π) | 6.49±0.25 mas[1] |
| Distance | 500 ± 20 ly (154 ± 6 pc) |
| Absolute magnitude (MV) | −0.89[2] |
| Orbit[6] | |
| Period (P) | 1,740±22 d |
| Eccentricity (e) | 0.316±0.043 |
| Periastron epoch (T) | 2453381 ± 37 JD |
| Argument of periastron (ω) (secondary) | 43.5±6.9° |
| Semi-amplitude (K1) (primary) | 12.4±0.6 km/s |
| Details | |
| Mass | 5.5[7] M☉ |
| Luminosity | 496[2] L☉ |
| Temperature | 16,100[3] K |
| Metallicity [Fe/H] | 0.00[8] dex |
| Rotation | 1.75222[9] d |
| Rotational velocity (v sin i) | 15[10] km/s |
| Other designations | |
| ζ Scl, CD−30°19790, FK5 3932, GC 33337, HD 224990, HIP 183, HR 9091, SAO 135551, CCDM J00023-2943AB, WDS J00023-2943AB, GSC 06418-01221 | |
| Database references | |
| SIMBAD | data |
The primary component, designated Zeta Sculptoris A, is a single-lined, low amplitude spectroscopic binary system with an orbital period of 4.8 years and an eccentricity of 0.32.[6] The visible member of this pair is a B-type main-sequence star with a stellar classification of B5 V.[3] It has a 13th magnitude companion, Zeta Sculptoris B, at an angular separation of 3 arcseconds along a position angle of 330° (as of 1927).[11] According to Eggleton and Tokovinin (2008), it is most likely gravitationally bound to the primary component.[12]