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Epic variable star 53 EP

Del Cir

RA 229.2371° · Dec -60.9573° · star

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Score breakdown

· 7 badges
53 pts · Epic
Epic 78 pts → Anomaly
  • Blazing O-type star +26
  • Naked-eye visible +8
  • Variable star +5
  • Blue-white star +5
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 53

25 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Blazing O-type star · +26
  • Main-sequence star · +2
  • Blue-white star · +5
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads O8.5V — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
  • 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 you can see it with your own eyes from a dark site, over in Circinus.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around May — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out blue-white (B−V -0.1) — the hallmark of a surface far hotter than the Sun's.
  • 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
-14.96
bv
-0.077
constellation
Cir
luminosity
83945998.6519
mag
5.04
name
Del Cir
spect
O8.5V
var amplitude
0.15
var designation
Del
var max
5.023
var min
5.173

About Del Cir

Del Cir is an epic variable star. It sits in the constellation Cir, shines at apparent magnitude 5.04 and has spectral type O8.5V.

Its spectrum reads O8.5V — an O-type star — the hottest, rarest main class there is. Fewer than one star in a million is an O, and none of them lasts long.

How to see it

Look for Del Cir in the constellation Cir. At apparent magnitude 5.04, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Del Cir 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 Del Cir is an epic variable star

Del Cir scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Naked-eye visible, Blazing O-type star, Main-sequence star, Blue-white star, Gently variable 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.