Star in the constellation Draco
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! style="text-align: center; background-color: #FFFFC0;" colspan="2" | Observation dataEpoch J2000.0
       Equinox J2000.0 (ICRS)
! style="text-align:left" | Constellation
! style="text-align:left" | Right ascension
! style="text-align:left" | Declination
! style="text-align:left" | Apparent magnitude (V)
! style="background-color: #FFFFC0; text-align: center;" colspan="2"| Characteristics
! style="text-align:left" | Evolutionary stage
! style="text-align:left" | Spectral type
! style="text-align:left" | U−B 
! style="text-align:left" | B−V 
! style="text-align:left" | Variable type
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Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar ( ), is a solitary, orange-red star in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of +3.85. Based upon an annual parallax shift of 9.79 mas as seen from the Earth, the star is located around 333 light years from the Sun.
This is an evolved red giant star on the asymptotic giant branch with a stellar classification of M0III-IIIa Ca1. It is a suspected slow irregular variable with a periodicity of roughly 1,100 days. It has an estimated 1.53 times the mass of the Sun and a measured radius of 70 times the radius of the Sun. It is radiating 884 times the solar luminosity from its photosphere at an effective temperature of 3,761 K.
Nomenclature.
λ Draconis (Latinised to "Lambda Draconis") is the star's Bayer designation.
It bore the traditional name "Giausar" (also written as "Gianfar, Giansar and Giauzar") and "Juza." In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars. The WGSN approved the name "Giausar" for this star on February 1, 2017, and it is now so included in the List of IAU-approved Star Names.
In Chinese, (), meaning "Right Wall of Purple Forbidden Enclosure", refers to an asterism consisting of Lambda Draconis, Alpha Draconis, Kappa Draconis, 24 Ursae Majoris, 43 Camelopardalis, Alpha Camelopardalis and BK Camelopardalis. Consequently, the Chinese name for Lambda Draconis itself is (, .), representing (), meaning "First Minister". 上輔 (Shǎngfǔ) was westernized into "Sang Poo" or "Shaou Poo" by R.H. Allen.
Namesakes.
USS Giansar (AK-111) was a United States Navy Crater class cargo ship named after the star.
References.
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