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Rare variable star 44 EP

HD 111934

RA 193.4068° · Dec -60.3571° · star

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Score breakdown

· 6 badges
44 pts · Rare
Rare 50 pts → Epic
  • Supergiant +18
  • Under the Southern Cross +8
  • Hot blue B-type star +6
  • Variable star +5
  • Gently variable +4
  • A named variable star +3
Total score 44

6 more points to reach Epic.

Badges

  • Variable star · +5
  • Under the Southern Cross · +8
  • Hot blue B-type star · +6
  • Supergiant · +18
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads B3Ib: — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.
  • 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.

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 6.9 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Crux.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Could we get there?

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

Properties

absmag
0.812
bv
0.187
constellation
Cru
dist ly
540.889
luminosity
41.2287
mag
6.91
name
HD 111934
spect
B3Ib:
var amplitude
0.16
var designation
BU
var max
6.837
var min
6.997

About HD 111934

HD 111934 is a rare variable star. It lies about 540.9 light-years from Earth, sits in the constellation Cru, shines at apparent magnitude 6.91 and has spectral type B3Ib:.

Its spectrum reads B3Ib: — a blue-white B-type star, with a surface tens of thousands of degrees hot and a life measured in tens of millions of years.

How to see it

Look for HD 111934 in the constellation Cru. At apparent magnitude 6.91, it is an easy target for binoculars.

Like any astronomical target, HD 111934 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 HD 111934 is a rare variable star

HD 111934 scores 44 points on Spacedle's rarity scale, which places it in the rare tier. Another 6 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Under the Southern Cross, Hot blue B-type star, Supergiant, Gently 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.