Back Shaula Afrikaans الشولة Arabic Shaula AST Шаўла Byelorussian Shaula Catalan Shaula Czech Lambda Scorpii German Shaula Spanish لاندا کژدم Persian Lambda Scorpii Finnish
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Scorpius |
| Pronunciation | /ˈʃɔːlə/[1][2] |
| Right ascension | 17h 33m 36.520s[3] |
| Declination | −37° 06′ 13.76″[3] |
| Apparent magnitude (V) | 1.62 + 14.9 + 12.0[3][4] |
| Characteristics | |
| Spectral type | B1.5IV + B2IV[5][6] |
| U−B color index | −0.880[7] |
| B−V color index | −0.240[7] |
| Variable type | Beta Cephei (A)[8] |
| Astrometry | |
| Radial velocity (Rv) | −3.00[9] km/s |
| Proper motion (μ) | RA: −8.90[3] mas/yr[3] Dec.: −29.95 mas/yr[3] |
| Parallax (π) | 5.71±0.90 mas[3] |
| Distance | approx. 570 ly (approx. 180 pc) |
| Absolute magnitude (MV) | −3.70[10] |
| Orbit[11] | |
| Primary | A |
| Companion | B |
| Period (P) | 2.8825 yr |
| Semi-major axis (a) | 49.3 mas |
| Eccentricity (e) | 0.121 |
| Inclination (i) | 77.2° |
| Orbit[11] | |
| Primary | Aa |
| Companion | Ab |
| Period (P) | 5.9520 d |
| Eccentricity (e) | 0.26 |
| Semi-amplitude (K1) (primary) | 39.3 km/s |
| Details | |
| λ Sco Aa | |
| Mass | 10.4[5] M☉ |
| Radius | 8.8±1.2[8] R☉ |
| Luminosity | 36,300[8] L☉ |
| Surface gravity (log g) | 3.8[6] cgs |
| Temperature | 25,000±1,000[8] K |
| Rotation | 3.4±0.5[8] days |
| Rotational velocity (v sin i) | 150[8] km/s |
| λ Sco Ab | |
| Mass | 2.0±0.2[8] M☉ |
| Radius | 1.5±0.2[8] R☉ |
| λ Sco B | |
| Mass | 8.1[5] M☉ |
| Radius | 4.7±1.0[8] R☉ |
| Surface gravity (log g) | 4.0[6] cgs |
| Temperature | 25,000±1,000[8] K |
| Other designations | |
| Shaula, 35 Scorpii, 35 Sco, CD−37 11673, FK5 652, HD 158926, HIP 85927, HR 6527, SAO 208954, CCDM J17336-3706A/B/C | |
| Database references | |
| SIMBAD | data |
Lambda Scorpii is a triple star system and the second-brightest object in the constellation of Scorpius. It is formally named Shaula; Lambda Scorpii is its Bayer designation, which is Latinised from λ Scorpii and abbreviated Lambda Sco or λ Sco. With an apparent visual magnitude of 1.62, it is one of the brightest stars in the night sky.
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