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Rare variable star 44 EP

HD 154365

RA 256.5229° · Dec -26.5806° · star

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Score breakdown

· 6 badges
44 pts · Rare
Rare 50 pts → Epic
  • Bright giant +12
  • Strongly variable +10
  • Sun-like G-type star +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • A named variable star +3
Total score 44

6 more points to reach Epic.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Sun-like G-type star · +8
  • Bright giant · +12
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G0II — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.
  • 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 7.5 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Ophiuchus.
  • 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 June — that's when to go looking.

Could we get there?

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

Properties

absmag
-1.836
bv
0.849
constellation
Oph
dist ly
2380.7007
luminosity
472.498
mag
7.48
name
HD 154365
spect
G0II
var amplitude
0.68
var designation
BF
var max
6.972
var min
7.652

About HD 154365

HD 154365 is a rare variable star. It lies about 2,380.7 light-years from Earth, sits in the constellation Oph, shines at apparent magnitude 7.48 and has spectral type G0II.

Its spectrum reads G0II — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 154365 in the constellation Oph. At apparent magnitude 7.48, it is an easy target for binoculars.

Like any astronomical target, HD 154365 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 154365 is a rare variable star

HD 154365 scores 44 points on Spacedle's rarity scale, which places it in the rare 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, Bright giant, Strongly 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.