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Rare variable star 47 EP

Kap Pav

RA 284.2377° · Dec -67.2335° · star

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Score breakdown

· 6 badges
47 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Strongly variable +10
  • Naked-eye visible +8
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 47

3 more points to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Yellow-white F-type star · +3
  • Supergiant · +18
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F5Ib-II: — an F-type star — a little hotter, whiter and shorter-lived than the 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.

Sense of scale

  • In perspective. Far away by human standards, yet still a local address inside the Milky Way's spiral arms.

Find it in the sky

  • How to spot it. At magnitude 4.4 you can see it with your own eyes from a dark site, over in Pavo.
  • 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 July — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
-1.529
bv
0.53
constellation
Pav
dist ly
500.2392
luminosity
356.123
mag
4.4
name
Kap Pav
spect
F5Ib-II:
var amplitude
0.88
var designation
Kap
var max
3.931
var min
4.811

About Kap Pav

Kap Pav is a rare variable star. It lies about 500.2 light-years from Earth, sits in the constellation Pav, shines at apparent magnitude 4.4 and has spectral type F5Ib-II:.

Its spectrum reads F5Ib-II: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for Kap Pav in the constellation Pav. At apparent magnitude 4.4, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Kap Pav 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 Kap Pav is a rare variable star

Kap Pav scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Naked-eye visible, Yellow-white F-type star, Supergiant, Strongly 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.