About HR 7823
HR 7823 is a common star. It sits in the constellation Cyg, shines at apparent magnitude 6.39 and has spectral type F1II.
Its spectrum reads F1II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
Common star 18 EP
HR 7823
RA 306.7824° · Dec 34.3291° · star
Score breakdown
· 3 badgesCommon 22 pts → Uncommon
- Bright giant +12
- Star +3
- Yellow-white F-type star +3
Total score 18
4 more points to reach Uncommon.
Badges
- Star · +3
- Yellow-white F-type star · +3
- Bright giant · +12
Trivia
What it actually is
- Spectral class. Its spectrum reads F1II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
- Where it is in life. It is a bright giant, well on its way to the largest stars there are.
Find it in the sky
- How to spot it. At magnitude 6.4 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Cygnus.
- 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 July — that's when to go looking.
Its true colour
- Its true colour. Measured through blue and visual filters it comes out yellow-white (B−V 0.5) — a shade brighter and crisper than our own Sun.
- 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 6480 K, against the Sun's 5778 K.
Properties
- absmag
- -13.61
- bv
- 0.48
- constellation
- Cyg
- luminosity
- 24210290.4674
- mag
- 6.39
- name
- HR 7823
- spect
- F1II
Nearby objects
How to see it
Look for HR 7823 in the constellation Cyg. At apparent magnitude 6.39, it is an easy target for binoculars.
Like any astronomical target, HR 7823 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 HR 7823 is a common star
HR 7823 scores 18 points on Spacedle's rarity scale, which places it in the common tier. Another 4 points would lift it into a rarer tier.
That score comes from 3 science badges — Star, Yellow-white F-type star and Bright giant — 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.