Delta Ophiuchi

δ Ophδ OphiuchiYed Priorδ Oph (Yed Prior)
Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior, is a star in the constellation of Ophiuchus.wikipedia
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List of stars in Ophiuchus

68 Ophbrighter membersfourth-brightest in the constellation
The apparent visual magnitude is 2.75, making this a third-magnitude star and the fourth-brightest in the constellation.

Epsilon Ophiuchi

ε Ophε OphiuchiYed Posterior
It forms a naked eye optical double with Epsilon Ophiuchi (named Yed Posterior ).
Located less than five degrees south of the celestial equator in the eastern part of the constellation, it forms a naked eye optical double with Delta Ophiuchi (named Yed Prior ).

Delta Serpentis

δ Serδ Serpentisδ Ser A
Delta Ophiuchi was a member of the indigenous Arabic asterism al-Nasaq al-Yamānī, the "Southern Line" of al-Nasaqān the "Two Lines", along with Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi, Zeta Ophiuchi and Gamma Ophiuchi.
It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines"., along with α Ser (Unukalhai), ε Ser (Ba, Pa), δ Oph (Yed Prior), ε Oph (Yed Posterior), ζ Oph (Han) and γ Oph (Tsung Ching).

Chinese star names

Chinese nameChinese uranographyTraditional Chinese star names
Consequently, the Chinese name for Delta Ophiuchi itself is 天市右垣九 (Tiān Shì Yòu Yuán jiǔ, the Ninth Star of Right Wall of Heavenly Market Enclosure), representing the state of Liang (or Leang).

Alpha Serpentis

α Serα SerpentisUnukalhai
Delta Ophiuchi was a member of the indigenous Arabic asterism al-Nasaq al-Yamānī, the "Southern Line" of al-Nasaqān the "Two Lines", along with Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi, Zeta Ophiuchi and Gamma Ophiuchi.
Alpha Serpentis is a member of the indigenous Arabic asterism al-Nasaq al-Yamānī "the Southern Line" of al-Nasaqān "the Two Lines", along with Delta Serpentis, Epsilon Serpentis, Delta Ophiuchi, Epsilon Ophiuchi, Zeta Ophiuchi and Gamma Ophiuchi.

Epsilon Serpentis

ε Serε SerpentisEpsilon
Delta Ophiuchi was a member of the indigenous Arabic asterism al-Nasaq al-Yamānī, the "Southern Line" of al-Nasaqān the "Two Lines", along with Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi, Zeta Ophiuchi and Gamma Ophiuchi.
along with α Ser (Unukalhai), δ Ser, δ Oph (Yed Prior), ε Oph (Yed Posterior), ζ Oph and γ Oph.

Zeta Ophiuchi

ζ Ophiuchiζ Oph*zet Oph
Delta Ophiuchi was a member of the indigenous Arabic asterism al-Nasaq al-Yamānī, the "Southern Line" of al-Nasaqān the "Two Lines", along with Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi, Zeta Ophiuchi and Gamma Ophiuchi.
It was a member of indigenous Arabic asterism al-Nasaq al-Yamānī, "the Southern Line" of al-Nasaqān "the Two Lines", along with α Ser (Unukalhai), δ Ser (Qin, Tsin), ε Ser (Ba, Pa), δ Oph (Yed Prior), ε Oph (Yed Posterior) and γ Oph (Tsung Ching).

Kappa Herculis

κ Herculisκ Herκ Her A
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven ancient states in China and which mark the right borderline of the enclosure, consisting of Delta Ophiuchi, Beta Herculis, Gamma Herculis, Kappa Herculis, Gamma Serpentis, Beta Serpentis, Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi and Zeta Ophiuchi.
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven old states in China and marks the right borderline of the enclosure, consisting of Kappa Herculis, Beta Herculis, Gamma Herculis, Gamma Serpentis, Beta Serpentis, Delta Serpentis, Alpha Serpentis, Epsilon Serpentis, Delta Ophiuchi, Epsilon Ophiuchi and Zeta Ophiuchi.

Beta Herculis

β Herβ Herculisbeta star
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven ancient states in China and which mark the right borderline of the enclosure, consisting of Delta Ophiuchi, Beta Herculis, Gamma Herculis, Kappa Herculis, Gamma Serpentis, Beta Serpentis, Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi and Zeta Ophiuchi.
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven old states in China and which is marking the right borderline of the enclosure, consisting of Beta Herculis, Gamma Herculis, Kappa Herculis, Gamma Serpentis, Beta Serpentis, Delta Serpentis, Alpha Serpentis, Epsilon Serpentis, Delta Ophiuchi, Epsilon Ophiuchi and Zeta Ophiuchi.

Gamma Herculis

γ Herγ Herculisγ Her
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven ancient states in China and which mark the right borderline of the enclosure, consisting of Delta Ophiuchi, Beta Herculis, Gamma Herculis, Kappa Herculis, Gamma Serpentis, Beta Serpentis, Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi and Zeta Ophiuchi.
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of γ Herculis, β Herculis, κ Herculis, γ Serpentis, β Serpentis, δ Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.

Gamma Serpentis

γ Serγ SerpentisGamma
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven ancient states in China and which mark the right borderline of the enclosure, consisting of Delta Ophiuchi, Beta Herculis, Gamma Herculis, Kappa Herculis, Gamma Serpentis, Beta Serpentis, Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi and Zeta Ophiuchi.
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of γ Serpentis, β Herculis, γ Herculis, κ Herculis, β Serpentis, δ Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.

Beta Serpentis

β Serβ SerpentisBeta
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which represents eleven ancient states in China and which mark the right borderline of the enclosure, consisting of Delta Ophiuchi, Beta Herculis, Gamma Herculis, Kappa Herculis, Gamma Serpentis, Beta Serpentis, Alpha Serpentis, Delta Serpentis, Epsilon Serpentis, Epsilon Ophiuchi and Zeta Ophiuchi.
In Chinese, 天市右垣 (Tiān Shì Yòu Yuán), meaning Right Wall of Heavenly Market Enclosure, refers to an asterism which is represent eleven old states in China which is marking the right borderline of the enclosure, consisting of β Serpentis, β Herculis, γ Herculis, κ Herculis, γ Serpentis, δ Serpentis, α Serpentis, ε Serpentis, δ Ophiuchi, ε Ophiuchi and ζ Ophiuchi.

Liang (state)

LiangState of LiangLiang State
Consequently, the Chinese name for Delta Ophiuchi itself is 天市右垣九 (Tiān Shì Yòu Yuán jiǔ, the Ninth Star of Right Wall of Heavenly Market Enclosure), representing the state of Liang (or Leang).
Liang is represented by the star Delta Ophiuchi in asterism Right Wall, Heavenly Market enclosure (see Chinese constellation).

Star

starsstellarmassive star
Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior, is a star in the constellation of Ophiuchus.

Constellation

constellationsEuropean constellationModern constellation
Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior, is a star in the constellation of Ophiuchus.

Ophiuchus

Ophiuchus constellationOphOphiuchus Superbubble
Delta Ophiuchi (δ Ophiuchi, abbreviated Delta Oph, δ Oph), formally named Yed Prior, is a star in the constellation of Ophiuchus.

Naked eye

naked-eyeunaided eyenaked human eye
It forms a naked eye optical double with Epsilon Ophiuchi (named Yed Posterior ).

Double star

visual companiondouble starsoptical double
It forms a naked eye optical double with Epsilon Ophiuchi (named Yed Posterior ).

Apparent magnitude

apparent visual magnitudemagnitudevisual magnitude
The apparent visual magnitude is 2.75, making this a third-magnitude star and the fourth-brightest in the constellation.

Parallax

trigonometric parallaxsolar parallaxmotion parallax
Parallax measurements from the Hipparcos spacecraft yield a distance estimate of approximately 171 ly from the Sun (Epsilon Ophiuchi is approximately 108 ly).

Hipparcos

HIPHipparcos CatalogueHipparcos satellite
Parallax measurements from the Hipparcos spacecraft yield a distance estimate of approximately 171 ly from the Sun (Epsilon Ophiuchi is approximately 108 ly).

Sun

solarSolThe Sun
Parallax measurements from the Hipparcos spacecraft yield a distance estimate of approximately 171 ly from the Sun (Epsilon Ophiuchi is approximately 108 ly).

Latinisation of names

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

Bayer designation

BayerdesignationBayer letter
δ Ophiuchi (Latinised to Delta Ophiuchi) is the star's Bayer designation.

Arabic

Arabic languageArabic-languageArab
Yed derives from the Arabic يد yad "hand".