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Rare star 47 EP

HR 4538

RA 177.4859° · Dec -70.2258° · star

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Score breakdown

· 5 badges
47 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Intrinsically luminous (Mv < −2) +10
  • Naked-eye visible +8
  • Sun-like G-type star +8
  • Star +3
Total score 47

3 more points to reach Epic.

Badges

  • Star · +3
  • Naked-eye visible · +8
  • Sun-like G-type star · +8
  • Supergiant · +18
  • Intrinsically luminous (Mv < −2) · +10

Trivia

What it actually is

  • Spectral class. Its spectrum reads G5Ib — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a supergiant, hundreds of times wider 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 5 you can see it with your own eyes from a dark site, over in Musca.
  • 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. ≈ 16.7 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-2.337
bv
1.36
constellation
Mus
dist ly
948.128
luminosity
749.5489
mag
4.98
name
HR 4538
spect
G5Ib

About HR 4538

HR 4538 is a rare star. It lies about 948.1 light-years from Earth, sits in the constellation Mus, shines at apparent magnitude 4.98 and has spectral type G5Ib.

Its spectrum reads G5Ib — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HR 4538 in the constellation Mus. At apparent magnitude 4.98, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 4538 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 HR 4538 is a rare star

HR 4538 scores 47 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.

That score comes from 5 science badges — Star, Naked-eye visible, Sun-like G-type star, Supergiant and Intrinsically luminous (Mv < −2) — 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.