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Epic variable star 71 EP

HD 174089

RA 282.3691° · Dec -16.7230° · star

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Score breakdown

· 9 badges
71 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Intrinsically luminous (Mv < −2) +10
  • Strongly variable +10
  • Toward the galactic centre +8
  • Sun-like G-type star +8
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • On the zodiac +3
  • A named variable star +3
Total score 71

7 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Toward the galactic centre · +8
  • On the zodiac · +3
  • Sun-like G-type star · +8
  • Supergiant · +18
  • Intrinsically luminous (Mv < −2) · +10
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads G2Ib — a G-type star: the very same spectral class as our own Sun.
  • Where it is in life. It is a supergiant, hundreds of times wider 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 7.6 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. Impossible with our current technology — and the next millennium of it.

Properties

absmag
-2.233
bv
0.89
constellation
Sgr
dist ly
2965.0545
luminosity
681.0829
mag
7.56
name
HD 174089
spect
G2Ib
var amplitude
0.66
var designation
YZ
var max
7.022
var min
7.682

About HD 174089

HD 174089 is an epic variable star. It lies about 2,965.1 light-years from Earth, sits in the constellation Sgr, shines at apparent magnitude 7.56 and has spectral type G2Ib.

Its spectrum reads G2Ib — a G-type star: the very same spectral class as our own Sun.

How to see it

Look for HD 174089 in the constellation Sgr. At apparent magnitude 7.56, it is an easy target for binoculars.

Like any astronomical target, HD 174089 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 174089 is an epic variable star

HD 174089 scores 71 points on Spacedle's rarity scale, which places it in the epic tier. Another 7 points would lift it into a rarer tier.

That score comes from 9 science badges — Variable star, Distant (over 1,000 light-years), Toward the galactic centre, On the zodiac, Sun-like G-type star, Supergiant, Intrinsically luminous (Mv < −2) and Strongly variable — 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.