Zeta Leonis
 Adhafera is the ζ star in the lion's mane (circled) |
|
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Leo |
| Right ascension | 10h 16m 41.41597s[1] |
| Declination | +23° 25′ 02.3221″[1] |
| Apparent magnitude (V) | 3.33[2] |
| Characteristics | |
| Spectral type | F0 III[3][4] |
| U−B color index | +0.07[2] |
| B−V color index | +0.30[2] |
| Variable type | Suspected |
| Astrometry | |
| Radial velocity (Rv) | -15.6[5] km/s |
| Proper motion (μ) | RA: +18.39[1] mas/yr Dec.: -6.84[1] mas/yr |
| Parallax (π) | 11.90 ± 0.18[1] mas |
| Distance | 274 ± 4 ly (84 ± 1 pc) |
| Details | |
| Mass | 3[6] M☉ |
| Radius | 6[7] R☉ |
| Luminosity | 85[7] L☉ |
| Surface gravity (log g) | 3.0[7] cgs |
| Temperature | 6,792[7] K |
| Metallicity [Fe/H] | –0.03[8] dex |
| Rotational velocity (v sin i) | 72.4[7] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
Zeta Leonis (ζ Leo, ζ Leonis) is a third-magnitude star in the constellation Leo, the lion. It has the traditional name Adhafera (Aldhafera, Adhafara), from the Arabic الضفيرة al-ðafīrah "the braid/curl", a reference to its position in the lion's mane. It forms the second star (after Gamma Leonis) in the blade of "The Sickle", which is an asterism formed from the head of Leo.[10]
Properties
Adhafera is a giant star with a stellar classification of F0 III. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified.[4] Its apparent magnitude is +3.44, making it relatively faint for a star that is visible to the naked eye. Nevertheless, it shines with 85 times the luminosity of the Sun.[7] Adhafera has about three times the Sun's mass[6] and six times the radius of the Sun.[7] Parallax measurements from the Hipparcos satellite yield an estimated distance to Adhafera of 274 light-years (84 parsecs)[1] from Earth.
Adhafera forms a double star with an optical companion that has an apparent magnitude of 5.90. Known as 35 Leo, this star is separated from Adhafera by 325.9 arcseconds along a position angle of 340°.[11][12] The two stars do not form a binary star system as 35 Leo is only 100 light years from Earth.
See also
- Lists of stars in the constellation Leo
References
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