Age f

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Stern
Alterf (λ Leonis)
AladinLite
Observation
dates equinoxJ2000.0 , epoch : J2000.0
Constellation lion
Right ascension 09 h 31 m 43.23 s
declination + 22 ° 58 ′ 4.8 ″
Apparent brightness 4.31 likes
Typing
B − V color index (1.54) 
U − B color index (1.89) 
R − I index (0.90) 
Spectral class K4.5 III
Astrometry
Radial velocity (24.27 ± 0.19) km / s
parallax (10.55 ± 0.56)  mas
distance (309 ± 20)  ly
(95)  pc
Proper movement 
Rec. Share: (−22.12 ± 0.88)  mas / a
Dec. portion: (−38.23 ± 0.57)  mas / a
Physical Properties
radius (46)  R
Luminosity

(460)  L

Effective temperature (3950)  K.
Other names
and catalog entries
Bayer name λ Leonis
Flamsteed name 4 Leonis
Bonn survey BD + 23 ° 2107
Bright Star Catalog HR 3773 [1]
Henry Draper Catalog HD 82308 [2]
Hipparcos catalog HIP 46750 [3]
SAO catalog SAO 80885 [4]
Tycho catalog TYC 1959-1582-1 [5]
2MASS catalog 2MASS J09314324 + 2258050 [6]
Other names Alterf, FK5 2756

Alterf (Arabic "the look") is the proper name of the star λ Leonis (Lambda Leonis). Alterf belongs to the spectral class K5 and has an apparent brightness of +4.3 mag. According to Hipparcos' measurements, Alterf is about 336 light years from Earth, according to Gaia DR2 about 310 light years.

Individual evidence

  1. a b c d e f g h i lam Leo. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed September 14, 2018 .
  2. a b c Alterf. Jim Kaler, accessed September 14, 2018 .