Lambda Normae
Star in the constellation Norma From Wikipedia, the free encyclopedia
λ Normae, Latinised as Lambda Normae, is a binary star[3] system in the southern constellation of Norma, located near the northern constellation boundary with Scorpius. It is visible to the naked eye as a dim, white-hued point of light that shines with a combined apparent visual magnitude of 5.44.[2] The system is located approximately 350 light years distant from the Sun based on parallax, but is drifting closer with a radial velocity of about −15 km/s.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Norma |
| Right ascension | 16h 19m 17.64660s[1] |
| Declination | −42° 40′ 26.3014″[1] |
| Apparent magnitude (V) | 5.44[2] (5.83 + 6.86)[3] |
| Characteristics | |
| Spectral type | A0V + A3V |
| B−V color index | 0.099±0.004[2] |
| Astrometry | |
| Radial velocity (Rv) | −15.0±3.7[2] km/s |
| Proper motion (μ) | RA: +7.59[1] mas/yr Dec.: −13.30[1] mas/yr |
| Parallax (π) | 9.35±0.76 mas[1] |
| Distance | 350 ± 30 ly (107 ± 9 pc) |
| Absolute magnitude (MV) | 0.31[2] |
| Orbit[3] | |
| Period (P) | 67.50 yr |
| Semi-major axis (a) | 0.293″ |
| Eccentricity (e) | 0.788 |
| Inclination (i) | 45.8° |
| Longitude of the node (Ω) | 215.2° |
| Periastron epoch (T) | 2049.59 B |
| Argument of periastron (ω) (secondary) | 82.5° |
| Details | |
| Luminosity | 64[2] L☉ |
| λ Nor A | |
| Mass | 2.53–2.57[4] M☉ |
| λ Nor B | |
| Mass | 2.00–2.13[4] M☉ |
| Other designations | |
| λ Nor, CD−42°11188, HD 146667, HIP 79963, HR 6071, SAO 226650, WDS J16193-4240[5] | |
| Database references | |
| SIMBAD | data |
The pair have an orbital period of 67.5 years with a high eccentricity of 0.788.[3] Both components are A-type main-sequence stars that are generating energy through core hydrogen fusion. The primary component has a visual magnitude of 5.83, and is of class A0V. The fainter secondary is class A3V with a magnitude 6.86.[6]
References
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