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Rare variable star 39 EP

HR 7886

RA 309.4780° · Dec 18.2686° · star

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Score breakdown

· 6 badges
39 pts · Rare
Rare 50 pts → Epic
  • Fades out of naked-eye view +16
  • Giant star +6
  • Variable star +5
  • Cool red M-type star +5
  • Gently variable +4
  • A named variable star +3
Total score 39

11 more points to reach Epic.

Badges

  • Variable star · +5
  • Cool red M-type star · +5
  • Giant star · +6
  • Gently variable · +4
  • Fades out of naked-eye view · +16
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads M6III — 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 6.2 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Delphinus.
  • 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. Hopelessly far for any craft humanity can build today.

Properties

absmag
0.882
bv
1.162
constellation
Del
dist ly
381.0233
luminosity
38.6545
mag
6.22
name
HR 7886
spect
M6III
var amplitude
0.45
var designation
EU
var max
5.874
var min
6.324

About HR 7886

HR 7886 is a rare variable star. It lies about 381 light-years from Earth, sits in the constellation Del, shines at apparent magnitude 6.22 and has spectral type M6III.

Its spectrum reads M6III — 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 7886 in the constellation Del. At apparent magnitude 6.22, it is an easy target for binoculars.

Like any astronomical target, HR 7886 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 7886 is a rare variable star

HR 7886 scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Cool red M-type star, Giant star, Gently variable, 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.