Delta Leonis information

δ Leonis
	Location of δ Leonis (circled)
Observation data; Epoch J2000 Equinox J2000
Constellation	Leo
Right ascension	11h 14m 06.50142s
Declination	20° 31′ 25.3853″
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 (Rv)	−20.2 km/s
Proper motion (μ)	RA: +143.42 mas/yr ; Dec.: −129.88 mas/yr
Parallax (π)	55.82 ± 0.25 mas
Distance	58.4 ± 0.3 ly ; (17.91 ± 0.08 pc)
Absolute magnitude (MV)	+1.29
Details
Mass	2.2 M☉
Radius	2.14 ± 0.040 R☉
Luminosity	15.5 ± 1.8 L☉
Surface gravity (log g)	3.91 cgs
Temperature	8,296 K
Rotational velocity (v sin i)	180 km/s
Age	0.60–0.75 Gyr
Other designations
	Zosma, Zozma, Zosca, Duhr, Zubra, δ Leo, 68 Leo, BD +21°2298, FK5 422, GC 15438, GCTP 2614.00, Gl 419, HD 97603, HIP 54872, HR 4357, SAO 81727
Database references
SIMBAD	data

Delta Leonis (δ Leonis, abbreviated Delta Leo, δ Leo), also named Zosma /ˈzɒzmə/,^[12]^[13] is a star in the zodiac constellation of Leo. Based upon parallax measurements, it lies at a distance of about 58.4 light-years (17.9 parsecs) from the Sun.^[1]

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^ Davis, George A. (1944). "The pronunciations, derivations, and meanings of a selected list of star names". Popular Astronomy. 52: 8–30. Bibcode:1944PA.....52....8D.
^ "IAU Catalog of Star Names". Retrieved 28 July 2016.

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[Davis44-12] Davis, George A. (1944). "The pronunciations, derivations, and meanings of a selected list of star names". Popular Astronomy. 52: 8–30. Bibcode:1944PA.....52....8D.

[IAU-CSN-13] "IAU Catalog of Star Names". Retrieved 28 July 2016.

Observation data Epoch J2000 Equinox J2000
Location of δ Leonis (circled)
Constellation	Leo
Right ascension	11^h 14^m 06.50142^s^[1]
Declination	20° 31′ 25.3853″^[1]
Apparent magnitude (V)	2.56^[2]
Characteristics
Spectral type	A4 V^[3]
U−B color index	+0.12^[4]
B−V color index	+0.12^[4]
Variable type	Delta Scuti
Astrometry

Radial velocity (R_v)	−20.2^[2] km/s
Proper motion (μ)	RA: +143.42^[1] mas/yr Dec.: −129.88^[1] mas/yr
Parallax (π)	55.82 ± 0.25 mas^[1]
Distance	58.4 ± 0.3 ly (17.91 ± 0.08 pc)
Absolute magnitude (M_V)	+1.29^[5]

Details

Mass	2.2^[6] `M`_☉
Radius	2.14 ± 0.040^[7] `R`_☉
Luminosity	15.5 ± 1.8^[7] `L`_☉
Surface gravity (log g)	3.91^[8] cgs
Temperature	8,296^[7] K
Rotational velocity (v sin i)	180^[9] km/s
Age	0.60–0.75^[6] Gyr

Other designations
Zosma, Zozma, Zosca, Duhr, Zubra,^[10] δ Leo, 68 Leo, BD +21°2298, FK5 422, GC 15438, GCTP 2614.00, Gl 419, HD 97603, HIP 54872, HR 4357, SAO 81727^[11]
Database references
SIMBAD	data

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