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Epic variable star 55 EP

HR 758

RA 39.2597° · Dec 34.2643° · star

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Score breakdown

· 6 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • Dramatic variable (over 2 magnitudes) +20
  • Fades out of naked-eye view +16
  • Giant star +6
  • Variable star +5
  • Cool red M-type star +5
  • A named variable star +3
Total score 55

23 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Cool red M-type star · +5
  • Giant star · +6
  • Dramatic variable (over 2 magnitudes) · +20
  • Fades out of naked-eye view · +16
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads M4IIIe-M8e — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.
  • Where it is in life. It is a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
  • 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 6.8 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Triangulum.
  • 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 October — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

absmag
-0.563
bv
1.292
constellation
Tri
dist ly
959.2822
luminosity
146.2851
mag
6.78
name
HR 758
spect
M4IIIe-M8e
var amplitude
4.12
var designation
R
var max
5.132
var min
9.252

About HR 758

HR 758 is an epic variable star. It lies about 959.3 light-years from Earth, sits in the constellation Tri, shines at apparent magnitude 6.78 and has spectral type M4IIIe-M8e.

Its spectrum reads M4IIIe-M8e — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.

How to see it

Look for HR 758 in the constellation Tri. At apparent magnitude 6.78, it is an easy target for binoculars.

Like any astronomical target, HR 758 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 758 is an epic variable star

HR 758 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 6 science badges — Variable star, Cool red M-type star, Giant star, Dramatic variable (over 2 magnitudes), Fades out of naked-eye view 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.