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Uncommon variable star 28 EP

HD 186684

RA 297.5708° · Dec -65.7831° · star

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Score breakdown

· 6 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Sun-like G-type star +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 28

6 more points to reach Rare.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Sun-like G-type star · +8
  • Main-sequence star · +2
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G8V — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
  • 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 9.4 you'll want a small backyard telescope, over in Pavo.
  • 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 July — that's when to go looking.

Could we get there?

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

Properties

absmag
1.849
bv
0.852
constellation
Pav
dist ly
1065.8693
luminosity
15.8635
mag
9.42
name
HD 186684
spect
G8V
var amplitude
0.15
var designation
BO
var max
9.377
var min
9.527

About HD 186684

HD 186684 is an uncommon variable star. It lies about 1,065.9 light-years from Earth, sits in the constellation Pav, shines at apparent magnitude 9.42 and has spectral type G8V.

Its spectrum reads G8V — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 186684 in the constellation Pav. At apparent magnitude 9.42, a small backyard telescope will bring it into view.

Like any astronomical target, HD 186684 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 186684 is an uncommon variable star

HD 186684 scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 6 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Distant (over 1,000 light-years), Sun-like G-type star, Main-sequence star, 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.