Elnath

HR 1791 · HIP 25428 · β Tau

👁️ Naked-eye

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

Star

Apparent magnitude: 1.65 mag
Parallax: 24.36 mas → about 133.9 light-years away
Spectral type: B7III
Right ascension: 81.573°
Declination: 28.6075°
Designation: HR 1791
Bayer designation: β Tau
HIP number: 25428
IAU name adopted: 2016-07-20
Name language: Arabic
Name origin (IAU): From the pre-Islamic Arabian name al-naṭh, "the Butting (with the horns)," an alternative name for the 1st lunar mansion al-sharaṭān consisting of β and γ Ari (see β Ari). Some late Arabic authors also applied al-naṭh as a star name to α Ari. In recent times the name, as “Nath,” was wrongly transferred to β Tau, and subsequently it was completed to “Elnath” (adding the Arabic definite article).

Constellation

Light from this object takes about 134 years to reach Earth — the light you see tonight left around AD 1892 (official distance ÷ speed of light).
At magnitude 1.7 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 28.6° — 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.