About 10 Sge
10 Sge is an epic variable star. It sits in the constellation Sge, shines at apparent magnitude 5.71 and has spectral type G5Ibv SB.
Its spectrum reads G5Ibv SB — a G-type star: the very same spectral class as our own Sun.
Epic variable star 68 EP
10 Sge
RA 299.0053° · Dec 16.6348° · star
Score breakdown
· 7 badgesEpic 78 pts → Anomaly
- Supergiant +18
- Fades out of naked-eye view +16
- Strongly variable +10
- Naked-eye visible +8
- Sun-like G-type star +8
- Variable star +5
- A named variable star +3
Total score 68
10 more points to reach Anomaly.
Badges
- Variable star · +5
- Naked-eye visible · +8
- Sun-like G-type star · +8
- Supergiant · +18
- Strongly variable · +10
- Fades out of naked-eye view · +16
- A named variable star · +3
Trivia
What it actually is
- Spectral class. Its spectrum reads G5Ibv SB — a G-type star: the very same spectral class as our own Sun.
- Where it is in life. It is a supergiant, hundreds of times wider than the Sun.
- It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.
Find it in the sky
- How to spot it. At magnitude 5.7 you can see it with your own eyes from a dark site, over in Sagitta.
- 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 orange (B−V 0.9) — cooler than the Sun, and the kind of star that burns steadily for tens of billions of years.
- 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.
Properties
- absmag
- -14.29
- bv
- 0.903
- constellation
- Sge
- luminosity
- 45289757.9904
- mag
- 5.71
- name
- 10 Sge
- spect
- G5Ibv SB
- var amplitude
- 0.77
- var designation
- S
- var max
- 5.289
- var min
- 6.059
How to see it
Look for 10 Sge in the constellation Sge. At apparent magnitude 5.71, it can be glimpsed with the unaided eye under dark skies.
Like any astronomical target, 10 Sge 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 10 Sge is an epic variable star
10 Sge scores 68 points on Spacedle's rarity scale, which places it in the epic tier. Another 10 points would lift it into a rarer tier.
That score comes from 7 science badges — Variable star, Naked-eye visible, Sun-like G-type star, Supergiant, Strongly variable, Fades out of naked-eye view and A named variable star — 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.