Delta Draconis

From Wikipedia, the free encyclopedia
(Redirected from Altais)
Jump to navigation Jump to search

Template:Short description Script error: No such module "For". Script error: No such module "Distinguish".

δ Draconis
Template:Location mark
Location of δ Draconis (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension Template:RA[1]
Declination Template:DEC[1]
Apparent magnitude (V) 3.07[2]
Characteristics
Spectral type G9 III[3]
U−B Template:Engvar +0.78[2]
B−V Template:Engvar +1.00[2]
Astrometry
Radial velocity (Rv)Template:Val[4] km/s
Proper motion (μ) RA: +94.599 mas/yr[1]
Dec.: +92.374 mas/yr[1]
Parallax (π)33.3499±0.1567 mas[1]
DistanceTemplate:Rnd ± Template:Rnd ly
(Template:Rnd ± Template:Rnd pc)
Absolute magnitude (MV)+0.62[5]
Details[4]
MassTemplate:Val Template:Solar mass
RadiusTemplate:Val[6] Template:Solar radius
Luminosity59 Template:Solar luminosity
Surface gravity (log g)Template:Val cgs
TemperatureTemplate:Val[6] K
Metallicity [Fe/H]Template:Val dex
Rotational velocity (v sin i)8[7] km/s
AgeTemplate:Val Gyr
Metallicity [Fe/H]{{{metal_fe2}}} dex
Other designations
Aldib, Altais,[8] Nodus Secundus,[9] 57 Draconis, HR 7310, BD+67 1129, HD 180711, SAO 18222, FK5 723, HIP 94376.[10]
Database references
SIMBADdata

Script error: No such module "Check for unknown parameters".

Delta Draconis (δ Draconis, abbreviated Delta Dra, δ Dra), formally named Altais Template:IPAc-en,[11] is a yellow star in the constellation of Draco. It has an apparent visual magnitude of 3.0,[2] making it easily visible to the naked eye. Based on parallax measurements obtained by the Gaia mission, it is approximately Template:Convert from the Sun.[1]

Nomenclature

δ Draconis (Latinised to Delta Draconis) is the star's Bayer designation.

It bore the traditional names Aldib, Altais[8] (the goat) and Nodus Secundus.[9] The title Altais was derived from Arabic Al Tāis "the Goat", the association of this star, along with Pi Draconis, Rho Draconis and Epsilon Draconis (Tyl).[12] According to a 1971 NASA catalog of stars, Al Tāis or Tais were the title for three stars : Delta Draconis as Altais, Pi Draconis as Tais I and Rho Draconis as Tais II (exclude Epsilon Draconis).[13] In 2016, the International Astronomical Union organized a Working Group on Star Names (WGSN)[14] to catalogue and standardize proper names for stars. The WGSN approved the name Altais for this star on 21 August 2016 and it is now so included in the List of IAU-approved Star Names.[11]

In Chinese, Script error: No such module "Lang". (Script error: No such module "Lang".), meaning Celestial Kitchen or Heaven's Kitchen, refers to an asterism consisting of Delta Draconis, Sigma Draconis, Epsilon Draconis, Rho Draconis, 64 Draconis and Pi Draconis.[15] Consequently, the Chinese name for Delta Draconis itself is Script error: No such module "Lang". (Script error: No such module "Lang"., Template:Langx).[16]

Properties

Delta Draconis is a giant star with a stellar classification of G9 III. This indicates that it has exhausted the supply of hydrogen at its core and entered a later stage in its evolution. Around 1.7 billion years old, Delta Draconis has expanded to 10.5 times the Sun's radius and is radiating 59 times the luminosity of the Sun from its outer atmosphere at an effective temperature of 4,873 K.[4] At this temperature, it is giving off the yellow-hued glow of a G-type star.[17] With a mass 1.7[4] times that of the Sun, this star will end its life as a white dwarf.[9]

Pole star

Delta Draconis is the northern pole star of Ceres, lying 1.5 degrees from the true pole.[18]

References

Template:Reflist

Template:Stars of Draco

  1. ↑ a b c d e Cite error: Invalid <ref> tag; no text was provided for refs named DR3
  2. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named clpl4_99
  3. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named apj116
  4. ↑ a b c d Cite error: Invalid <ref> tag; no text was provided for refs named jofre2015
  5. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named pasj60_4_781
  6. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named Baines2025
  7. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csrv
  8. ↑ a b Cite error: Invalid <ref> tag; no text was provided for refs named bakich95
  9. ↑ a b c Cite error: Invalid <ref> tag; no text was provided for refs named kaler
  10. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named simbad
  11. ↑ a b Script error: No such module "citation/CS1".
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named allen1963
  13. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named roads1971
  14. ↑ Script error: No such module "citation/CS1".
  15. ↑ 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.
  16. ↑ 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.
  17. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named csiro
  18. ↑ Script error: No such module "citation/CS1".
Retrieved from "http://debianws.lexgopc.com/wiki143/index.php?title=Delta_Draconis&oldid=2158112"