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Common star 19 EP

HD 109009

RA 187.9704° · Dec -58.2906° · star

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Score breakdown

· 4 badges
19 pts · Common
Common 22 pts → Uncommon
  • Under the Southern Cross +8
  • Subgiant (leaving the main sequence) +5
  • Star +3
  • Yellow-white F-type star +3
Total score 19

3 more points to reach Uncommon.

Badges

  • Star · +3
  • Under the Southern Cross · +8
  • Yellow-white F-type star · +3
  • Subgiant (leaving the main sequence) · +5

Trivia

What it actually is

  • Spectral class. Its spectrum reads F3/F5IV/V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

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 7.1 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Crux.
  • 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 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. ≈ 3.4 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 298.2 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

absmag
3.252
bv
0.418
constellation
Cru
dist ly
190.9578
luminosity
4.3571
mag
7.09
name
HD 109009
spect
F3/F5IV/V

About HD 109009

HD 109009 is a common star. It lies about 191 light-years from Earth, sits in the constellation Cru, shines at apparent magnitude 7.09 and has spectral type F3/F5IV/V.

Its spectrum reads F3/F5IV/V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 109009 in the constellation Cru. At apparent magnitude 7.09, it is an easy target for binoculars.

Like any astronomical target, HD 109009 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 109009 is a common star

HD 109009 scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Under the Southern Cross, 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.