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Common star 20 EP

HD 109475

RA 188.8744° · Dec -61.7408° · star

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Score breakdown

· 4 badges
20 pts · Common
Common 22 pts → Uncommon
  • Under the Southern Cross +8
  • Giant star +6
  • Star +3
  • Yellow-white F-type star +3
Total score 20

2 more points to reach Uncommon.

Badges

  • Star · +3
  • Under the Southern Cross · +8
  • Yellow-white F-type star · +3
  • Giant star · +6

Trivia

What it actually is

  • Spectral class. Its spectrum reads F2/F3III: — 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 6.6 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 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 443.2 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

absmag
1.902
bv
0.475
constellation
Cru
dist ly
283.8607
luminosity
15.1078
mag
6.6
name
HD 109475
spect
F2/F3III:

About HD 109475

HD 109475 is a common star. It lies about 283.9 light-years from Earth, sits in the constellation Cru, shines at apparent magnitude 6.6 and has spectral type F2/F3III:.

Its spectrum reads F2/F3III: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 109475 in the constellation Cru. At apparent magnitude 6.6, it is an easy target for binoculars.

Like any astronomical target, HD 109475 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 109475 is a common star

HD 109475 scores 20 points on Spacedle's rarity scale, which places it in the common tier. Another 2 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 Giant 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.