Aldulfin
HR 7852 · HIP 101421 · ε Del
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 4.03 mag
- Parallax
- 9.87 mas → about 330.5 light-years away
- Spectral type
- B6III
- Right ascension
- 308.3032°
- Declination
- 11.3033°
- Designation
- HR 7852
- Bayer designation
- ε Del
- HIP number
- 101421
- IAU name adopted
- 2017-09-05
- Name language
- Arabic
- Name origin (IAU)
- Arabic scholarship adopted the Greek loanword "dulfim" or "dulfin" (with article: ad-dulfin or simplified adulfin) for the marine mammal. The star ε Del at the dorsal fin of the Ptolemaic (smaller than ancient Greek) figure was called Al Dhanab al Dulfim (the Dolphin's Tail) and as there are many stars named with the Arabic root for "tail", WGSN adopted only the last part of the name.
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 330 years to reach Earth — the light you see tonight left around AD 1696 (official distance ÷ speed of light).
- At magnitude 4 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 11.3° — 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.