Lambda Draconis

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Template:Short description

λ Draconis
Template:Location mark
Location of λ Draconis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Draco
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) +3.85[2]
Characteristics
Evolutionary stage asymptotic giant branch[3]
Spectral type M0III-IIIa Ca1[4]
U−B Template:Engvar +1.97[2]
B−V Template:Engvar +1.62[2]
Variable type slow irregular[5]
Astrometry
Radial velocity (Rv)Template:Val[6] km/s
Proper motion (μ) RA: −40.97[1] mas/yr
Dec.: −19.19[1] mas/yr
Parallax (π)9.79±0.15 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)Template:Val[7]
Details[8]
MassTemplate:Val Template:Solar mass
RadiusTemplate:Val Template:Solar radius
LuminosityTemplate:Val Template:Solar luminosity
Surface gravity (log g)Template:Val[9] cgs
TemperatureTemplate:Val K
Metallicity [Fe/H]0.00 dex
AgeTemplate:Val Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
λ Dra, 1 Draconis, BD−70°665, FK5 433, HD 100029, HIP 56211, HR 4434, SAO 15532[10]
Database references
SIMBADdata

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Lambda Draconis (λ Draconis, abbreviated Lam Dra, λ Dra), also named Giausar (Template:IPAc-en Template:Respell),[11][12] is a solitary,[13] orange-red[14] star in the northern circumpolar constellation of Draco. It is visible to the naked eye with an apparent visual magnitude of +3.85.[2] Based upon an annual parallax shift of 9.79 mas as seen from the Earth,[1] the star is located around 333 light years from the Sun.

File:LamDraLightCurve.png
A light curve for Lambda Draconis, potted from MASCARA data[15][16]

This is an evolved red giant star on the asymptotic giant branch[3] with a stellar classification of M0III-IIIa Ca1.[4] It is a suspected slow irregular variable with a periodicity of roughly 1,100 days.[5] 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.[8]

Nomenclature

λ Draconis (Latinised to Lambda Draconis) is the star's Bayer designation.

It bore the traditional name Giausar[17] (also written as Gianfar, Giansar and Giauzar) and Juza. In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[18] 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.[12]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), 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.[19] Consequently, the Chinese name for Lambda Draconis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx.),[20] representing Script error: No such module "Lang". (Script error: No such module "Lang".), meaning First Minister.[21] 上輔 (Shǎngfǔ) was westernized into Sang Poo or Shaou Poo by R.H. Allen.[22]

Namesakes

USS Giansar (AK-111) was a United States Navy Crater class cargo ship named after the star.

References

Template:Reflist

Template:Stars of Draco

Template:Authority control

  1. ↑ a b c d e f Cite error: Invalid <ref> tag; no text was provided for refs named vanLeeuwen2007
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named Johnson1966
  3. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named eggen1992
  4. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named perkins1989
  5. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Samus2007
  6. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Famaey2009
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named park2013
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Baines2018
  9. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Tagaki2011
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named SIMBAD
  11. ↑ Script error: No such module "citation/CS1".
  12. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named IAU-LSN
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Eggleton2008
  14. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Moore2013
  15. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Burggraaff2018
  16. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named MASCARA
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Kaler
  18. ↑ Script error: No such module "citation/CS1".
  19. ↑ Template:In lang 中國星座神話, written by 陳久金. Published by 台灣書房出版有限公司, 2005, Template:ISBN.
  20. ↑ Template:In lang 香港太空館 - 研究資源 - 亮星中英對照表 Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  21. ↑ English-Chinese Glossary of Chinese Star Regions, Asterisms and Star Name Template:Webarchive, Hong Kong Space Museum. Accessed on line November 23, 2010.
  22. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named Allen1963
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