Lambda1 Sculptoris
Double star in the constellation Sculptor
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Lambda1 Sculptoris, Latinised from λ1 Sculptoris, is a double star system in the southern constellation of Sculptor. It is close to the lower limit of visibility to the naked eye, with a combined apparent visual magnitude of +6.05.[2] Based upon an annual parallax shift of 6.89 mas as measured from Earth,[1] it is located roughly 470 light-years from the Sun. At that distance, the visual magnitude is diminished by an extinction factor of 0.026 due to interstellar dust.[10]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Sculptor |
| Right ascension | 00h 42m 42.89190s[1] |
| Declination | −38° 27′ 48.5416″[1] |
| Apparent magnitude (V) | +6.05[2] (6.612 + 7.041)[3] |
| Characteristics | |
| Spectral type | B9.5 V[4] + A9(V)[5] |
| U−B color index | −0.13[2] |
| B−V color index | −0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | 11.1±0.6[6] km/s |
| Proper motion (μ) | RA: +2.56[1] mas/yr Dec.: −6.72[1] mas/yr |
| Parallax (π) | 6.89±0.71 mas[1] |
| Distance | approx. 470 ly (approx. 150 pc) |
| Absolute magnitude (MV) | +0.27[7] |
| Details | |
| λ1 Scl A | |
| Mass | 2.83±0.13[8] M☉ |
| Luminosity | 94[8] L☉ |
| Temperature | 10,351[8] K |
| Rotational velocity (v sin i) | 35[8] km/s |
| Other designations | |
| λ1 Scl, CD−39°175, HD 4065, HIP 3356, HR 185, SAO 192690, WDS J00427-3828AB[9] | |
| Database references | |
| SIMBAD | data |
The brighter star, component A, has a visual magnitude of 6.6, while the secondary, component B, is magnitude 7.0.[3] As of 2000, the pair had an angular separation of 0.737 arcsecond along a position angle of 14.0°.[3] Component A is a blue-white-hued B-type main-sequence star with a stellar classification of B9.5 V.[4] It has 2.8 times the mass of the Sun and radiates 94 times the solar luminosity from its photosphere at an effective temperature of 10,351 K.[8] The mass ratio is 0.609, meaning the secondary is only 60.9% as massive as the primary.[11]