Hydor
HR 9098 · HIP 301 · 2 Cet
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 4.536 mag
- Parallax
- 11.98 mas → about 272.3 light-years away
- Spectral type
- B9IVn
- Right ascension
- 0.934949°
- Declination
- -17.336°
- Designation
- HR 9098
- Bayer designation
- 2 Cet
- HIP number
- 301
- IAU name adopted
- 2025-08-25
- Name language
- Greek
- Name origin (IAU)
- The IAU-name "Hydor" resembles the original application of this name as a constellation in a vast area of faint stars in antiquity. It fits nicely the Indigenous Arabian constellation of "Safina", Ship. Note that the name "Hydor" was misapplied to a star in Aqr in the recent time. WGSN corrects this mistake. The Greek term "Hydor" (Ὕδωρ), Water, originally referred to a huge constellation, depicted around Cetus on ancient globes and described south of Aquarius in Aratus's poem of the 4th century BCE.
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 272 years to reach Earth — the light you see tonight left around AD 1754 (official distance ÷ speed of light).
- At magnitude 4.5 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination -17.3° — 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.