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Uncommon star 28 EP

Xi Sco

RA 241.0916° · Dec -11.3746° · star

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Score breakdown

· 6 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Naked-eye visible +8
  • Binary star +6
  • Subgiant (leaving the main sequence) +5
  • Star +3
  • On the zodiac +3
  • Yellow-white F-type star +3
Total score 28

6 more points to reach Rare.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Binary star · +6
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Subgiant (leaving the main sequence) · +5

Trivia

What makes it special

  • Not one star but two. It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

What it actually is

  • Spectral class. Its spectrum reads F6 IV-V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

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 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 May — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 1.4 million years at Voyager 1's speed (17 km/s).

Properties

absmag
3.069
binary
yes
constellation
Sco
dist ly
79.3567
luminosity
5.157
mag
5
name
Xi Sco
spect
F6 IV-V

About Xi Sco

Xi Sco is an uncommon star. It lies about 79.4 light-years from Earth, sits in the constellation Sco, shines at apparent magnitude 5 and has spectral type F6 IV-V.

It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

How to see it

Look for Xi Sco in the constellation Sco. At apparent magnitude 5, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, Xi Sco 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 Xi Sco is an uncommon star

Xi Sco scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

That score comes from 6 science badges — Star, Naked-eye visible, Binary star, On the zodiac, Yellow-white F-type star and Subgiant (leaving the main sequence) — 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.