Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Leo |
Right ascension | 10h 07m 19.95186s [1] |
Declination | 16° 45′ 45.592″ [1] |
Apparent magnitude (V) | 3.486 [2] |
Characteristics | |
Spectral type | A0 Ib [2] |
U−B color index | −0.206 [2] |
B−V color index | −0.026 [2] |
Astrometry | |
Radial velocity (Rv) | 1.40 [3] km/s |
Proper motion (μ) |
RA: −2.80
[1]
mas/
yr Dec.: −1.82 [1] mas/ yr |
Parallax (π) | 2.57 ± 0.16 mas [1] |
Distance | 1,270 ± 80
ly (390 ± 20 pc) |
Absolute magnitude (MV) | −5.54 [4] |
Details | |
Mass | 10 [5] M☉ |
Radius | 47 [4] R☉ |
Luminosity | 19,000 [5] L☉ |
Surface gravity (log g) | 2.00 [5] cgs |
Temperature | 9,600 [2] K |
Metallicity | −0.04 [4] |
Rotational velocity (v sin i) | 2 [2] km/s |
Age | 25 [5] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Eta Leonis (η Leo, η Leonis) is a fourth-magnitude star in the constellation Leo, about 1,270 light years away.
Eta Leonis is a white supergiant with the stellar classification A0Ib. Since 1943, the spectrum of this star has served as one of the stable anchor points by which other stars are classified. [6] Though its apparent magnitude is 3.5, making it a relatively dim star to the naked eye, it is nearly 20,000 times more luminous than the Sun, with an absolute magnitude of -5.60. The Hipparcos astrometric data has estimated the distance of Eta Leonis to be roughly 390 parsecs from Earth, or 1,270 light years away.
Eta Leonis is apparently a multiple star system, but the number of components and their separation is uncertain. [7]