← Back to dex
Uncommon star 30 EP

HD 102305

RA 176.5320° · Dec -68.7972° · star

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 4 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Supergiant +18
  • Distant (over 1,000 light-years) +6
  • Star +3
  • Yellow-white F-type star +3
Total score 30

4 more points to reach Rare.

Badges

  • Star · +3
  • Distant (over 1,000 light-years) · +6
  • Yellow-white F-type star · +3
  • Supergiant · +18

Trivia

What it actually is

  • Spectral class. Its spectrum reads F7Ib — an F-type star — a little hotter, whiter and shorter-lived than the 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 8.8 it is just past naked-eye reach — ordinary binoculars will pull it in, 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. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 55.6 million years at Voyager 1's speed (17 km/s).

Properties

absmag
-1.086
bv
0.899
constellation
Mus
dist ly
3166.5632
luminosity
236.81
mag
8.85
name
HD 102305
spect
F7Ib

About HD 102305

HD 102305 is an uncommon star. It lies about 3,166.6 light-years from Earth, sits in the constellation Mus, shines at apparent magnitude 8.85 and has spectral type F7Ib.

Its spectrum reads F7Ib — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 102305 in the constellation Mus. At apparent magnitude 8.85, it is an easy target for binoculars.

Like any astronomical target, HD 102305 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 102305 is an uncommon star

HD 102305 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 4 science badges — Star, Distant (over 1,000 light-years), Yellow-white F-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.