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Uncommon variable star 29 EP

HD 150708

RA 249.7665° · Dec 60.6997° · star

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Score breakdown

· 6 badges
29 pts · Uncommon
Uncommon 34 pts → Rare
  • Sun-like G-type star +8
  • Variable star +5
  • Subgiant (leaving the main sequence) +5
  • Never sets (northern circumpolar) +4
  • Gently variable +4
  • A named variable star +3
Total score 29

5 more points to reach Rare.

Badges

  • Variable star · +5
  • Never sets (northern circumpolar) · +4
  • Sun-like G-type star · +8
  • Subgiant (leaving the main sequence) · +5
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G2IV + K0IV — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a subgiant, caught in the act of leaving the main sequence as the hydrogen in its core runs out.
  • It changes. This star does not hold still: its brightness rises and falls on a rhythm of hours, days or years, either pulsing in size or being eclipsed by a companion.

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 Draco.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around May — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
2.864
bv
0.714
constellation
Dra
dist ly
385.9834
luminosity
6.2287
mag
8.23
name
HD 150708
spect
G2IV + K0IV
var amplitude
0.36
var designation
WW
var max
8.185
var min
8.545

About HD 150708

HD 150708 is an uncommon variable star. It lies about 386 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 8.23 and has spectral type G2IV + K0IV.

Its spectrum reads G2IV + K0IV — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 150708 in the constellation Dra. At apparent magnitude 8.23, it is an easy target for binoculars.

Like any astronomical target, HD 150708 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 150708 is an uncommon variable star

HD 150708 scores 29 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Never sets (northern circumpolar), Sun-like G-type star, Subgiant (leaving the main sequence), Gently variable and A named variable 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.