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Epic variable star 56 EP

HIP 38772

RA 119.0503° · Dec -44.1426° · star

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Score breakdown

· 5 badges
56 pts · Epic
Epic 78 pts → Anomaly
  • S-type star (zirconium giant) +20
  • Dramatic variable (over 2 magnitudes) +20
  • Deep red star +8
  • Variable star +5
  • A named variable star +3
Total score 56

22 more points to reach Anomaly.

Badges

  • Variable star · +5
  • S-type star (zirconium giant) · +20
  • Deep red star · +8
  • Dramatic variable (over 2 magnitudes) · +20
  • A named variable star · +3

Trivia

Hard to believe

  • True brightness. It pours out about 1.2 million 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 S42e — an S-type giant, its atmosphere laced with zirconium dredged up from the fusion going on below.
  • 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 9.6 you'll want a small backyard telescope, over in Puppis.
  • 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 January — 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 1.5) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3790 K, against the Sun's 5778 K.

Properties

absmag
-10.36
bv
1.5
constellation
Pup
luminosity
1213388.8505
mag
9.64
name
HIP 38772
spect
S42e
var amplitude
4.33
var designation
SU
var max
7.431
var min
11.761

About HIP 38772

HIP 38772 is an epic variable star. It sits in the constellation Pup, shines at apparent magnitude 9.64 and has spectral type S42e.

Its spectrum reads S42e — an S-type giant, its atmosphere laced with zirconium dredged up from the fusion going on below.

How to see it

Look for HIP 38772 in the constellation Pup. At apparent magnitude 9.64, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 38772 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 38772 is an epic variable star

HIP 38772 scores 56 points on Spacedle's rarity scale, which places it in the epic tier. Another 22 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, S-type star (zirconium giant), Deep red star, Dramatic variable (over 2 magnitudes) 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.