Ukdah
HR 3845 · HIP 47431 · ι Hya
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 3.91 mag
- Parallax
- 12.39 mas → about 263.2 light-years away
- Spectral type
- K3IIIvar
- Right ascension
- 144.964°
- Declination
- -1.1428°
- Designation
- HR 3845
- Bayer designation
- ι Hya
- HIP number
- 47431
- IAU name adopted
- 2018-06-01
- Name language
- Arabic
- Name origin (IAU)
- Kazwini knew the stars tau1, tau2 Hya as عقدة ʽuqdah (or ʽuḳdah), Arabic "knot". Rhoads (1971) considers this asterism consisting of four stars: tau1, tau2, 33 and ι Hya.
Source:IAU Working Group on Star Names · checked 2026-11-02 ↗ESA Hipparcos Catalogue (ESA Gaia Archive) · checked 2026-11-03 ↗
Related
Constellation
In everyday life
- Light from this object takes about 263 years to reach Earth — the light you see tonight left around AD 1763 (official distance ÷ speed of light).
- At magnitude 3.9 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination -1.1° — 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.