| |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Ara |
| Right ascension | 17h40m 23.82558s[1] |
| Declination | −49° 24′ 56.0993″[1] |
| Apparent magnitude (V) | 4.77[2] |
| Characteristics | |
| Spectral type | F4 V[3] |
| U−B color index | −0.04[2] |
| B−V color index | +0.40[2] |
| R−I color index | +0.22 |
| Variable type | 3.10[4] |
| Astrometry | |
| Radial velocity (Rv) | +3.6[4] km/s |
| Proper motion (μ) | RA: +104.233[1] mas/yr Dec.: −175.956[1] mas/yr |
| Parallax (π) | 47.7045 ± 0.1368 mas[1] |
| Distance | 68.4 ± 0.2 ly (20.96 ± 0.06 pc) |
| Absolute magnitude (MV) | +3.06[5] |
| Details | |
| Mass | 1.4[1] M☉ |
| Radius | 1.7[1] R☉ |
| Luminosity | 4.7[1] L☉ |
| Surface gravity (log g) | 4.06[1] cgs |
| Temperature | 6,495[1] K |
| Metallicity [Fe/H] | −0.24[4] dex |
| Rotational velocity (v sin i) | 15.5[6] km/s |
| Age | 2.4[1] Gyr |
| Other designations | |
CD−49°11616, GJ 9597, HD 160032, HIP 86486, HR 6569, NSV 23218, NLTT 45187, SAO 228257[7] | |
| Database references | |
| SIMBAD | data |
Lambda Arae (λ Ara, λ Arae) is the Bayer designation for a star in the southern constellationofAra. It is at a distance of 68 light-years (21parsecs) from Earth. The apparent visual magnitude of this star is 4.77,[2] making it bright enough to be seen with the naked eye.
The spectrum of this star matches a stellar classification of F4 V,[3] which places it among the category of F-type main sequence stars. It shines with 4.7 times the luminosity of the Sun. The outer atmosphere is radiating this energy at an effective temperature of 6,495 K, giving it the yellow-white hue of an F-type star. There is some evidence that this may be a binary star system consisting of two stars with identical masses.[6]
Examination of Lambda Arae with the Spitzer Space Telescope shows an excess of infrared emission at a wavelength of 70 μm. This suggests it may be orbited by a disk of dust at a radius of more than 15 astronomical units[8]
|
| |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| |||||||||||
| Stars |
| ||||||||||
| |||||||||||
| Star clusters |
| ||||||||||
| Nebulae |
| ||||||||||
| Galaxies |
| ||||||||||
