Delta Leonis

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**Delta Leonis**
Observation data Epoch J2000
Constellation (pronunciation)	Leo
Right ascension	11^h 14^m 06.5^s
Declination	+20° 31′ 25.4″
Apparent magnitude (V)	2.56
Characteristics
Spectral type	A4 V
U-B color index	0.12
B-V color index	0.12
Variable type	Delta Scuti?
Astrometry
Radial velocity (R_v)	-20.2 km/s
Proper motion (μ)	RA: 143.31 mas/yr Dec.: -130.43 mas/yr
Parallax (π)	56.52 ± 0.83 mas
Distance	57.7 ly (17.69 pc)
Absolute magnitude (M_V)	1.29
Details
Mass	2.2 M_☉
Radius	2 R_☉
Luminosity	23 L_☉
Temperature	8350 K
Metallicity	?
Rotation	180 km/s. (1/2 day)
Age	6-7.5 × 10⁸ years
Other designations
Zosma, Zozma, Zosca, Zozca, Duhr, Dhur, Zubra, 68 Leo, Gl 419, HR 4357, BD +21°2298, HD 97603, GCTP 2614.00, SAO 81727, FK5 422, HIP 54872.

Delta Leonis (δ Leo / δ Leonis) is a star in the constellation of Leo. It also has traditional names Zosma (or Zozma) or Duhr.

Zosma is a relatively ordinary main sequence star, although it is somewhat larger and hotter than the Sun. It is a fairly well-studied star, allowing for relatively accurate measurements of its age and size. Having a larger mass than the Sun it will have a shorter lifespan, and in another 600 million years or so will swell into an orange or red giant star before decaying quietly into a white dwarf. The name Zosma means girdle in ancient Greek, referring to the star's location in its constellation, on the hip of the lion.