About 34Phi Cas
34Phi Cas is a rare star. It sits in the constellation Cas, shines at apparent magnitude 4.95 and has spectral type F0Ia.
Its spectrum reads F0Ia — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Rare star 36 EP
34Phi Cas
RA 20.0205° · Dec 58.2316° · star
Score breakdown
· 5 badgesRare 50 pts → Epic
- Supergiant +18
- Naked-eye visible +8
- Never sets (northern circumpolar) +4
- Star +3
- Yellow-white F-type star +3
Total score 36
14 more points to reach Epic.
Badges
- Star · +3
- Naked-eye visible · +8
- Never sets (northern circumpolar) · +4
- Yellow-white F-type star · +3
- Supergiant · +18
Trivia
What it actually is
- Spectral class. Its spectrum reads F0Ia — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
- Where it is in life. It is a luminous supergiant — among the largest and rarest stars in the galaxy.
Find it in the sky
- How to spot it. At magnitude 5 you can see it with your own eyes from a dark site, over in Cassiopeia.
- Northern sky. It rides the northern half of the sky — an easier target the further north you are.
- Best time of year. It stands highest in the middle of the night around October — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out yellow (B−V 0.7) — almost exactly the Sun's own shade — a stellar twin in colour, if not in size.
- Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.
By the numbers
- Surface temperature. Its colour puts the surface at roughly 5660 K, against the Sun's 5778 K.
Properties
- absmag
- -15.05
- bv
- 0.683
- constellation
- Cas
- luminosity
- 91201083.9356
- mag
- 4.95
- name
- 34Phi Cas
- spect
- F0Ia
Nearby objects
How to see it
Look for 34Phi Cas in the constellation Cas. At apparent magnitude 4.95, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 34Phi Cas is best seen from a dark site away from city lights, and when it is above the horizon depends on your latitude and the time of year. The visibility panel above works out tonight's viewing window for your saved location.
Why 34Phi Cas is a rare star
34Phi Cas scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 14 points would lift it into a rarer tier.
That score comes from 5 science badges — Star, Naked-eye visible, Never sets (northern circumpolar), Yellow-white F-type star and Supergiant — each earned for a real, measurable property of the object. Rarity on Spacedle is never random: the more remarkable an object's astrophysics, the more badges it collects, the higher it scores, and the rarer it ranks.