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Uncommon star 33 EP

HD 172694

RA 280.5690° · Dec -15.8558° · star

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Score breakdown

· 4 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • Distant (over 1,000 light-years) +6
  • Hot blue B-type star +6
  • Star +3
Total score 33

1 more point to reach Rare.

Badges

  • Star · +3
  • Distant (over 1,000 light-years) · +6
  • Hot blue B-type star · +6
  • Supergiant · +18

Trivia

What it actually is

  • Spectral class. Its spectrum reads B2Ibe — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
  • 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 8.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Scutum.
  • 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 July — 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. ≈ 50.3 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-1.535
bv
0.151
constellation
Sct
dist ly
2861.0176
luminosity
358.0964
mag
8.18
name
HD 172694
spect
B2Ibe

About HD 172694

HD 172694 is an uncommon star. It lies about 2,861 light-years from Earth, sits in the constellation Sct, shines at apparent magnitude 8.18 and has spectral type B2Ibe.

Its spectrum reads B2Ibe — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for HD 172694 in the constellation Sct. At apparent magnitude 8.18, it is an easy target for binoculars.

Like any astronomical target, HD 172694 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 172694 is an uncommon star

HD 172694 scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Star, Distant (over 1,000 light-years), Hot blue B-type star and Supergiant — 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.