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Uncommon variable star 25 EP

HD 222259

RA 354.9141° · Dec -69.1958° · star

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Score breakdown

· 5 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Sun-like G-type star +8
  • Variable star +5
  • Subgiant (leaving the main sequence) +5
  • Gently variable +4
  • A named variable star +3
Total score 25

9 more points to reach Rare.

Badges

  • Variable star · +5
  • Sun-like G-type star · +8
  • Subgiant (leaving the main sequence) · +5
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G5/8IV (+F) — a G-type star: the very same spectral class as our own 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 8.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Tucana.
  • 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 September — 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. ≈ 2.6 million years at Voyager 1's speed (17 km/s).

Properties

absmag
4.871
bv
0.78
constellation
Tuc
dist ly
148.9978
luminosity
0.9808
mag
8.17
name
HD 222259
spect
G5/8IV (+F)
var amplitude
0.12
var designation
DS
var max
8.121
var min
8.241

About HD 222259

HD 222259 is an uncommon variable star. It lies about 149 light-years from Earth, sits in the constellation Tuc, shines at apparent magnitude 8.17 and has spectral type G5/8IV (+F).

Its spectrum reads G5/8IV (+F) — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 222259 in the constellation Tuc. At apparent magnitude 8.17, it is an easy target for binoculars.

Like any astronomical target, HD 222259 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 222259 is an uncommon variable star

HD 222259 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Sun-like G-type star, Subgiant (leaving the main sequence), 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.