Achird
HR 219 · HIP 3821 · η Cas
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 3.44 mag
- Parallax
- 167.98 mas → about 19.4 light-years away
- Spectral type
- G0V SB
- Right ascension
- 12.2762°
- Declination
- 57.8152°
- Designation
- HR 219
- Bayer designation
- η Cas
- HIP number
- 3821
- IAU name adopted
- 2017-09-05
- Name language
- Contemporary
- Name origin (IAU)
- The proper name Achird was apparently first applied to Eta Cassiopeiae in the Skalnate Pleso Atlas of the Heavens published in Slovacia in 1950, but is not known prior to that.
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 19 years to reach Earth — the light you see tonight left around AD 2007 (official distance ÷ speed of light).
- At magnitude 3.4 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 57.8° — from Seoul (37.6° N) it never sets and circles the northern sky all night.
Worked out from this object's official values.