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Epic variable star 55 EP

HR 7518

RA 296.2031° · Dec 29.2647° · star

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Score breakdown

· 7 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Intrinsically luminous (Mv < −2) +10
  • Strongly variable +10
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 55

23 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • Yellow-white F-type star · +3
  • 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 F2Iab: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is a supergiant. Drop it where the Sun is and its surface would engulf the inner planets.
  • 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 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Cygnus.
  • Northern sky. It rides the northern half of the sky — an easier target the further north 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
-2.511
bv
0.65
constellation
Cyg
dist ly
2568.1576
luminosity
879.8325
mag
6.97
name
HR 7518
spect
F2Iab:
var amplitude
0.78
var designation
SU
var max
6.412
var min
7.192

About HR 7518

HR 7518 is an epic variable star. It lies about 2,568.2 light-years from Earth, sits in the constellation Cyg, shines at apparent magnitude 6.97 and has spectral type F2Iab:.

Its spectrum reads F2Iab: — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HR 7518 in the constellation Cyg. At apparent magnitude 6.97, it is an easy target for binoculars.

Like any astronomical target, HR 7518 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 HR 7518 is an epic variable star

HR 7518 scores 55 points on Spacedle's rarity scale, which places it in the epic tier. Another 23 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), Yellow-white F-type star, Supergiant, Intrinsically luminous (Mv < −2), 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.