Tarf

HR 3249 · HIP 40526 · β Cnc

👁️ Naked-eye

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

Star

Apparent magnitude: 3.52 mag
Parallax: 10.75 mas → about 303.4 light-years away
Spectral type: K4III
Right ascension: 124.1288°
Declination: 9.1855°
Designation: HR 3249
Bayer designation: β Cnc
HIP number: 40526
IAU name adopted: 2018-06-01
Name language: Arabic
Name origin (IAU): Arabic: الطرف, Al-Ṭarf (The eyes of the lion) is one of the traditional "Lunar Stations". It is composed of the 2 stars: ε Leo and ο Leo. However, the name has been in common use for β Cnc as it was published in the Yale Bright Star Catalogue.

Constellation

Light from this object takes about 303 years to reach Earth — the light you see tonight left around AD 1723 (official distance ÷ speed of light).
At magnitude 3.5 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 9.2° — 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.