Yuyu

HR 3475 · HIP 43103 · ι Cnc

👁️ Naked-eye

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

Star

Apparent magnitude: 4.02 mag
Parallax: 9.85 mas → about 331.1 light-years away
Spectral type: G8Iab:
Right ascension: 131.6743°
Declination: 28.7599°
Designation: HR 3475
Bayer designation: ι Cnc
HIP number: 43103
IAU name adopted: 2026-02-22
Name language: Javanese
Name origin (IAU): Yuyu is a word from Javanese, inherited from Old Javanese "hayuyu", spoken on the island of Java, Indonesia. It means "freshwater crab". The animal can be found in rice fields in Indonesia and the constellation is attested for at least 1300 years.

Constellation

Light from this object takes about 331 years to reach Earth — the light you see tonight left around AD 1695 (official distance ÷ speed of light).
At magnitude 4 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 28.8° — 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.