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Uncommon variable star 28 EP

HD 188093

RA 298.8239° · Dec -44.0108° · star

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Score breakdown

· 7 badges
28 pts · Uncommon
Uncommon 34 pts → Rare
  • Toward the galactic centre +8
  • Variable star +5
  • Gently variable +4
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
  • Main-sequence star +2
Total score 28

6 more points to reach Rare.

Badges

  • Variable star · +5
  • Toward the galactic centre · +8
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Main-sequence star · +2
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F5/F6V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • 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 8.5 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Sagittarius.
  • 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. Hopelessly far for any craft humanity can build today.

Getting there

  • Aboard Voyager 1. ≈ 17.2 million years at Voyager 1's speed (17 km/s).

Properties

absmag
1.132
bv
0.515
constellation
Sgr
dist ly
979.4474
luminosity
30.7044
mag
8.52
name
HD 188093
spect
F5/F6V
var amplitude
0.07
var designation
V5553
var max
8.503
var min
8.573

About HD 188093

HD 188093 is an uncommon variable star. It lies about 979.4 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 8.52 and has spectral type F5/F6V.

Its spectrum reads F5/F6V — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HD 188093 in the constellation Sgr. At apparent magnitude 8.52, it is an easy target for binoculars.

Like any astronomical target, HD 188093 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 188093 is an uncommon variable star

HD 188093 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 7 science badges — Variable star, Toward the galactic centre, On the zodiac, Yellow-white F-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.