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Uncommon star 24 EP

HD 107821

RA 185.9259° · Dec -63.8701° · star

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Score breakdown

· 4 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Under the Southern Cross +8
  • Sun-like G-type star +8
  • Subgiant (leaving the main sequence) +5
  • Star +3
Total score 24

10 more points to reach Rare.

Badges

  • Star · +3
  • Under the Southern Cross · +8
  • Sun-like G-type star · +8
  • Subgiant (leaving the main sequence) · +5

Trivia

What it actually is

  • Spectral class. Its spectrum reads G6IV — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.

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 7.4 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Crux.
  • 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 March — 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. ≈ 5.8 million years at Voyager 1's speed (17 km/s).

Properties

absmag
2.395
bv
0.146
constellation
Cru
dist ly
328.4551
luminosity
9.594
mag
7.41
name
HD 107821
spect
G6IV

About HD 107821

HD 107821 is an uncommon star. It lies about 328.5 light-years from Earth, sits in the constellation Cru, shines at apparent magnitude 7.41 and has spectral type G6IV.

Its spectrum reads G6IV — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 107821 in the constellation Cru. At apparent magnitude 7.41, it is an easy target for binoculars.

Like any astronomical target, HD 107821 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 107821 is an uncommon star

HD 107821 scores 24 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 10 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Under the Southern Cross, Sun-like G-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.