Tiansi
HR 264 · HIP 4427 · γ Cas
👁️ Naked-eye
📋 A written introduction is coming — for now this page shows official values only.
Star
- Apparent magnitude
- 2.39 mag
- Parallax
- 5.94 mas → about 549.1 light-years away
- Spectral type
- B0IV:evar
- Right ascension
- 14.1772°
- Declination
- 60.7167°
- Designation
- HR 264
- Bayer designation
- γ Cas
- HIP number
- 4427
- IAU name adopted
- 2025-11-13
- Name language
- Chinese
- Name origin (IAU)
- Tiān Sì (Heavenly Quadriga, 天駟) is an old Chinese asterism, attested for at least 2000 years. It comprises four of the five stars forming the constellation Wangliang (王良) and represents the four horses pulling the chariot. It may thus be regarded as a constituent sub-constellation/asterism of Wangliang (王良). In the literature in English, the name "Ce" (old spelling: Tsih) can be found; WGSN corrects this misapplication of an old star 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 549 years to reach Earth — the light you see tonight left around AD 1477 (official distance ÷ speed of light).
- At magnitude 2.4 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
- Declination 60.7° — from Seoul (37.6° N) it never sets and circles the northern sky all night.
Worked out from this object's official values.