Zeta Cephei is a red-orange supergiant star in the constellation of Cepheus and represents the left shoulder of the king. It’s best viewed in autumn. It’s eight times more massive than the sun and a whopping 108 times larger in diameter.
My Observations
| Date | September 2, 2021 |
| Time | 10:15 p.m. |
| Location | Seattle, WA |
| Magnification | 102x |
| Scope | Meade 8″ SCT |
| Eyepiece | 20mm |
| Seeing | Above Average |
| Transparency | Above Average |
I landed upon this star tonight in search of the famous Delta Cephei. For a few minutes, I thought I was studying Delta, but then after looking at the star app, certain stars and descriptions didn’t match. I realized my scope’s computer was off and I slewed over too far.
I must admit: I am enamored by this star. It is a bright reddish-orange. Many orange supergiants seems to float in this area, such as the Garnet Star, but for some reason tonight, this star just illuminates the eyepiece beautifully and warmly — like a small glowing ember.
Key Stats
| Constellation | Cepheus |
| Best Viewing | Autumn |
| Visual Magnitude | +3.3 |
| Absolute Magnitude | -3.7 |
| Distance from Earth | 840 ly |
| Diameter | 108 |
| Milky Way Location | Orion Spur |
| My Viewing Grade | A |
Sources and Notes
Banner photo of sun by Nasa Solar Dynamics Observatory
Sketch by Wayne McGraw
AKA: SAO 34137, 21 Cep
The Garden Astronomer 