Epsilon Leonis
Template:Location mark Location of ε Leonis (circled) | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Leo |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 2.98[2] |
| Characteristics | |
| Spectral type | G1 II[3] |
| U−B Template:Engvar | +0.47[2] |
| B−V Template:Engvar | +0.808[4] |
| Variable type | suspected[5] |
| Astrometry | |
| Radial velocity (Rv) | 4.86 ± 0.33[4] km/s |
| Proper motion (μ) | RA: –45.61[1] mas/yr Dec.: –9.21[1] mas/yr |
| Parallax (π) | 13.22±0.15 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | –1.49[6] |
| Details | |
| Mass | Script error: No such module "val".[7] Template:Solar mass |
| Radius | Script error: No such module "val".[7] Template:Solar radius |
| Luminosity | Script error: No such module "val".[8] Template:Solar luminosity |
| Surface gravity (log g) | Script error: No such module "val".[8] cgs |
| Temperature | Script error: No such module "val".[8] K |
| Metallicity [Fe/H] | Script error: No such module "val".[8] dex |
| Rotational velocity (v sin i) | 8.1[4] km/s |
| Age | Script error: No such module "val".[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Algenubi, Ras Elased Australis,[9] ε Leo, 17 Leo, BD+24°2129, FK5 367, GC 13443, HD 84441, HIP 47908, HR 3873, SAO 81004 | |
| Database references | |
| SIMBAD | data |
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Epsilon Leonis (ε Leo, ε Leonis) is the fifth-brightest star in the constellation Leo, consistent with its Bayer designation Epsilon. It is known as Algenubi or Ras Elased Australis. Both names mean "the southern star of the lion's head". Australis is Latin for "southern" and Genubi is Arabic for "south".
Properties
Epsilon Leonis has a stellar classification of G1 II, with the luminosity class of II indicating that, it has evolved into a bright giant. It is much larger and brighter than the Sun with a luminosity 282[8] times and a radius 21 times solar.[7] Consequently, its absolute magnitude is actually –1.49,[6] making it one of the more luminous stars in the constellation, significantly more than Regulus. Its apparent brightness, though, is only 2.98.[2] Given its distance of about Script error: No such module "convert"., the star is more than three times the distance from the Sun than Regulus. At this distance, the visual magnitude of Epsilon Leonis is reduced by 0.03 as a result of extinction caused by intervening gas and dust.[6]
Epsilon Leonis exhibits the characteristics of a Cepheid-like variable, changing by an amplitude of 0.3 magnitude every few days.[10][9] It has around four times the mass of the Sun and a projected rotational velocity of 8.1 km s−1.[4] Based upon its iron abundance, the metallicity of this star's outer atmosphere is only around 52% of the Sun's. That is, the abundance of elements other than hydrogen and helium is about half that in the Sun.[4]
See also
References
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- ↑ a b c d e Script error: No such module "citation/CS1". Note: see VizieR catalogue I/311.
- ↑ a b c Script error: No such module "citation/CS1".
- ↑ Template:Cite simbad
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- ↑ a b c d e Script error: No such module "citation/CS1". Epsilon Leonis' database entry at VizieR.
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
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