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Epic variable star 52 EP

HD 156979

RA 260.6937° · Dec -45.6143° · star

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Score breakdown

· 8 badges
52 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Intrinsically luminous (Mv < −2) +10
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • Gently variable +4
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 52

26 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Supergiant · +18
  • Intrinsically luminous (Mv < −2) · +10
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F7/F8Ib/II — an F-type star — a little hotter, whiter and shorter-lived 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 6.7 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Scorpius.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.
  • Best time of year. It stands highest in the middle of the night around June — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 49.8 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-3.017
bv
0.83
constellation
Sco
dist ly
2836.1391
luminosity
1402.1678
mag
6.68
name
HD 156979
spect
F7/F8Ib/II
var amplitude
0.49
var designation
V636
var max
6.375
var min
6.865

About HD 156979

HD 156979 is an epic variable star. It lies about 2,836.1 light-years from Earth, sits in the constellation Sco, shines at apparent magnitude 6.68 and has spectral type F7/F8Ib/II.

Its spectrum reads F7/F8Ib/II — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 156979 in the constellation Sco. At apparent magnitude 6.68, it is an easy target for binoculars.

Like any astronomical target, HD 156979 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 HD 156979 is an epic variable star

HD 156979 scores 52 points on Spacedle's rarity scale, which places it in the epic tier. Another 26 points would lift it into a rarer tier.

That score comes from 8 science badges — Variable star, Distant (over 1,000 light-years), On the zodiac, Yellow-white F-type star, Supergiant, Intrinsically luminous (Mv < −2), 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.