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Epic variable star 51 EP

HIP 115390

RA 350.6185° · Dec 62.7571° · star

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Score breakdown

· 7 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Supergiant +18
  • Strongly variable +10
  • Deep red star +8
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 51

27 more points to reach Anomaly.

Badges

  • Variable star · +5
  • Never sets (northern circumpolar) · +4
  • Yellow-white F-type star · +3
  • Supergiant · +18
  • Deep red star · +8
  • Strongly variable · +10
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 340.4 thousand times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads F3Ibp-F6 — an F-type star — a little hotter, whiter and shorter-lived than the 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.

Find it in the sky

  • How to spot it. At magnitude 11 you'll want a small backyard telescope, over in Cassiopeia.
  • Never sets. So far north that from Britain, Canada or northern Europe it never dips below the horizon — it is up every clear night of the year.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out deep orange-red (B−V 1.8) — one of the coolest surfaces a star can have while still fusing.

Properties

absmag
-9
bv
1.75
constellation
Cas
luminosity
346736.8505
mag
11
name
HIP 115390
spect
F3Ibp-F6
var amplitude
1.02
var designation
CH
var max
10.397
var min
11.417

About HIP 115390

HIP 115390 is an epic variable star. It sits in the constellation Cas, shines at apparent magnitude 11 and has spectral type F3Ibp-F6.

Its spectrum reads F3Ibp-F6 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HIP 115390 in the constellation Cas. At apparent magnitude 11, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 115390 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 HIP 115390 is an epic variable star

HIP 115390 scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Never sets (northern circumpolar), Yellow-white F-type star, Supergiant, Deep red star, 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.