Haedus

HR 1641 · HIP 23767 · η Aur

👁️ Naked-eye

📋 A written introduction is coming — for now this page shows official values only.

Star

Apparent magnitude: 3.18 mag
Parallax: 13.4 mas → about 243.4 light-years away
Spectral type: B3V
Right ascension: 76.6287°
Declination: 41.2345°
Designation: HR 1641
Bayer designation: η Aur
HIP number: 23767
IAU name adopted: 2017-06-30
Name language: Latin
Name origin (IAU): The Almagest star catalogue gives for n Aur: τῶν ἑπι τοῦ ἀριστεροῦ καρπού β καλοvμένων Ἐρίϕωv ὁ ἑπόμενος (The rearmost of the two stars on the left wrist, which are called 'Haedi'). The Latin term "Haedi" is a translation of Greek Ἐρίϕωv and plural of "Haedus" meaning "young goat(s)".

Constellation

Light from this object takes about 243 years to reach Earth — the light you see tonight left around AD 1783 (official distance ÷ speed of light).
At magnitude 3.2 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 41.2° — it rises above the horizon in Seoul (37.6° N), so it is visible from Korea in the right season.

Worked out from this object's official values.