Delta Leonis

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Star
Zosma (δ Leonis)
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation lion
Right ascension 11 h 14 m 6.5 s
declination + 20 ° 31 ′ 25 ″
Apparent brightness 2.56 (2.54 to 2.57) mag
Typing
B − V color index +0.12 
U − B color index +0.12 
R − I index +0.03 
Spectral class A4 V
Astrometry
Radial velocity (−20.9 ± 0.6) km / s
parallax (55.82 ± 0.25)  mas
distance (58.43 ± 0.26)  ly
(17.91 ± 0.08)  pc  
Visual absolute brightness M vis +1.3 mag
Proper movement 
Rec. Share: (+143.42 ± 0.30)  mas / a
Dec. portion: (−129.88 ± 0.21)  mas / a
Physical Properties
Dimensions 2.2  M ☉
radius ~ 2  R ☉
Luminosity

23  L ☉

Effective temperature 8350  K
Rotation time 12 hours
Age 600 to 750 mill.  A
Other names
and catalog entries
Bayer name δ Leonis
Flamsteed name 68 Leonis
Bonn survey BD + 21 ° 2298
Bright Star Catalog HR 4357 [1]
Henry Draper Catalog HD 97603 [2]
Gliese catalog FY 419 [3]
Hipparcos catalog HIP 54872 [4]
SAO catalog SAO 81727 [5]
Tycho catalog TYC 1439-2479-1 [6]
2MASS catalog 2MASS J11140651 + 2031258 [7]
Other names Zosma, FK5 422

δ Leonis ( Delta Leonis ) is a star in the constellation Leo . He bears the historical proper names Duhr (also Dhur ) as well as Zubra or Zosma ("loincloth" or "girdle").

δ Leonis is almost 60 light years away and has an apparent magnitude of 2.6 mag. It belongs to the spectral class A4.

The IAU has the historical proper names on July 20, 2016 Zosma defined as standardized proper name for this star.

See also

Web links

Individual evidence

  1. ↑ a b c Hipparcos catalog (ESA 1997)
  2. ↑ NSI 5143. In: VSX. AAVSO, accessed October 29, 2018 .
  3. ↑ a b c Bright Star Catalog
  4. ↑ Pulkovo radial velocities for 35493 HIP stars
  5. ↑ a b c Hipparcos, the New Reduction (van Leeuwen, 2007)
  6. ↑ estimated using the apparent magnitude and distance
  7. ↑ a b c d e Zosma. In: STARS. Jim Kaler, accessed October 29, 2018 .
  8. ↑ Bulletin of the IAU Working Group on Star Names, No. 1, July 2016. (PDF) Retrieved November 9, 2016 (English, 184 KiB).