Deltoton

HR 660 · HIP 10644 · δ Tri

👁️ Naked-eye

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

Star

Apparent magnitude: 4.83 mag
Parallax: 92.73 mas → about 35.2 light-years away
Spectral type: G0V
Right ascension: 34.2635°
Declination: 34.2242°
Designation: HR 660
Bayer designation: δ Tri
HIP number: 10644
IAU name adopted: 2025-06-17
Name language: Greek
Name origin (IAU): Deltoton (Δελτωτόν; the letter Delta: Δ) is an ancient Greek name variant for the constellation triangulum, probably the original one as "Delta" is the first letter in the ancient Greek term for "dios", the highest god who possesses and rules the stars. In early uranographies, this triangle was considered a sign of the divinity of the starry sky, a divine inscription "written in the stars".

Constellation

Light from this object takes about 35 years to reach Earth — the light you see tonight left around AD 1991 (official distance ÷ speed of light).
At magnitude 4.8 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 34.2° — 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.