Lambda Draconis
star in the constellation Draco
Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar ( JAW-zar), 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 around +3.8. 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. This name comes from the Persian term jauzahr, referring to the nodes of the Moon's (or any) orbit. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN) to catalogue and standardize proper names for stars.
The public source identifies “Lambda Draconis” as star in the constellation Draco. This brief keeps that definition visible, then builds a research path around Lambda, Draconis and star.
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Named sources, stable identifiers and responsible institutions provide the strongest route from overview to verifiable evidence. The source revision retrieved here is dated Sep 12, 2026. The linked authority identifier is Q1347243. None of the 0 selected statements returned an explicit reference. The first chronological checks are 2016.
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This entry incorporates text from “Lambda Draconis” on English Wikipedia. Contributors are listed in the page history. Text is available under the Creative Commons Attribution-ShareAlike 4.0 License. Selected authority identifiers and statements are retrieved from Wikidata under CC0; their references and qualifiers remain part of the verification path.