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Uncommon star 30 EP

HD 150309

RA 250.2453° · Dec -21.6700° · star

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Score breakdown

· 5 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Sun-like G-type star +8
  • Deep red star +8
  • Distant (over 1,000 light-years) +6
  • Subgiant (leaving the main sequence) +5
  • Star +3
Total score 30

4 more points to reach Rare.

Badges

  • Star · +3
  • Distant (over 1,000 light-years) · +6
  • Sun-like G-type star · +8
  • Subgiant (leaving the main sequence) · +5
  • Deep red star · +8

Trivia

What it actually is

  • Spectral class. Its spectrum reads G8IV — 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 9.4 you'll want a small backyard telescope, over in Ophiuchus.
  • 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. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 23.9 million years at Voyager 1's speed (17 km/s).

Properties

absmag
1.341
bv
1.592
constellation
Oph
dist ly
1358.9834
luminosity
25.3279
mag
9.44
name
HD 150309
spect
G8IV

About HD 150309

HD 150309 is an uncommon star. It lies about 1,359 light-years from Earth, sits in the constellation Oph, shines at apparent magnitude 9.44 and has spectral type G8IV.

Its spectrum reads G8IV — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 150309 in the constellation Oph. At apparent magnitude 9.44, a small backyard telescope will bring it into view.

Like any astronomical target, HD 150309 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 150309 is an uncommon star

HD 150309 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 5 science badges — Star, Distant (over 1,000 light-years), Sun-like G-type star, Subgiant (leaving the main sequence) and Deep red 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.