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HR 153 · HIP 2920 · ζ Cas

👁️ Naked-eye

📋 A written introduction is coming — for now this page shows official values only.

Star

Apparent magnitude: 3.66 mag
Parallax: 5.5 mas → about 593 light-years away
Spectral type: B2IV
Right ascension: 9.2429°
Declination: 53.8969°
Designation: HR 153
Bayer designation: ζ Cas
HIP number: 2920
IAU name adopted: 2017-06-30
Name language: Chinese
Name origin (IAU): traditional Chinese single star asterism: an auxiliary road to Gedao; also represents the chief assistant to maintain roads. Gedao (the flying corridor) is a long chain of stars next to the Purple Palace enclosure constellation. Paradoxically, the auxiliary road is considered a single star asterism as attested in several historical star charts (e.g. the famous Suzhou map). Sun and Kistemaker (1997) who studied sources from the Han dynasty (around the year "0" plusminus 200 years) identify ζ Cas with this single star. Another researcher, Sun Shuwei, who dealt with the Xinyixiangfayao Star Map from Su Song (苏颂, 1020-1101 CE) identifies δ Cas. Both is plausible.

Constellation

Light from this object takes about 593 years to reach Earth — the light you see tonight left around AD 1433 (official distance ÷ speed of light).
At magnitude 3.7 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 53.9° — from Seoul (37.6° N) it never sets and circles the northern sky all night.

Worked out from this object's official values.

HR 153 · HIP 2920 · ζ Cas

👁️ Naked-eye

📋 A written introduction is coming — for now this page shows official values only.

Apparent magnitude: 3.66 mag
Parallax: 5.5 mas → about 593 light-years away
Spectral type: B2IV
Right ascension: 9.2429°
Declination: 53.8969°
Designation: HR 153
Bayer designation: ζ Cas
HIP number: 2920
IAU name adopted: 2017-06-30
Name language: Chinese
Name origin (IAU): traditional Chinese single star asterism: an auxiliary road to Gedao; also represents the chief assistant to maintain roads. Gedao (the flying corridor) is a long chain of stars next to the Purple Palace enclosure constellation. Paradoxically, the auxiliary road is considered a single star asterism as attested in several historical star charts (e.g. the famous Suzhou map). Sun and Kistemaker (1997) who studied sources from the Han dynasty (around the year "0" plusminus 200 years) identify ζ Cas with this single star. Another researcher, Sun Shuwei, who dealt with the Xinyixiangfayao Star Map from Su Song (苏颂, 1020-1101 CE) identifies δ Cas. Both is plausible.

Constellation

Light from this object takes about 593 years to reach Earth — the light you see tonight left around AD 1433 (official distance ÷ speed of light).
At magnitude 3.7 it is bright enough for the naked eye (limit about 6) — look from somewhere dark.
Declination 53.9° — from Seoul (37.6° N) it never sets and circles the northern sky all night.

Worked out from this object's official values.