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Uncommon star 24 EP

HD 105150

RA 181.5827° · Dec -59.1446° · star

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Score breakdown

· 5 badges
24 pts · Uncommon
Uncommon 34 pts → Rare
  • Under the Southern Cross +8
  • Distant (over 1,000 light-years) +6
  • White A-type star +5
  • Star +3
  • Main-sequence star +2
Total score 24

10 more points to reach Rare.

Badges

  • Star · +3
  • Distant (over 1,000 light-years) · +6
  • Under the Southern Cross · +8
  • White A-type star · +5
  • Main-sequence star · +2

Trivia

What it actually is

  • Spectral class. Its spectrum reads A0/A1V — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

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 7.7 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. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 40.4 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 3.6 million years even at the Parker Solar Probe's 192 km/s.

Properties

absmag
-1.579
bv
0.098
constellation
Cru
dist ly
2296.8734
luminosity
372.9065
mag
7.66
name
HD 105150
spect
A0/A1V

About HD 105150

HD 105150 is an uncommon star. It lies about 2,296.9 light-years from Earth, sits in the constellation Cru, shines at apparent magnitude 7.66 and has spectral type A0/A1V.

Its spectrum reads A0/A1V — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HD 105150 in the constellation Cru. At apparent magnitude 7.66, it is an easy target for binoculars.

Like any astronomical target, HD 105150 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 105150 is an uncommon star

HD 105150 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 5 science badges — Star, Distant (over 1,000 light-years), Under the Southern Cross, White A-type star and Main-sequence 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.