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Rare variable star 35 EP

HR 981

RA 46.8831° · Dec -78.9892° · star

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Score breakdown

· 6 badges
35 pts · Rare
Rare 50 pts → Epic
  • Bright giant +12
  • Naked-eye visible +8
  • Variable star +5
  • Gently variable +4
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 35

15 more points to reach Epic.

Badges

  • Variable star · +5
  • Naked-eye visible · +8
  • Yellow-white F-type star · +3
  • Bright giant · +12
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F2II-III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.
  • Where it is in life. It is a bright giant, well on its way to the largest stars there are.
  • 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 5.7 you can see it with your own eyes from a dark site, over in Hydrus.
  • 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 November — that's when to go looking.

Could we get there?

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

Properties

absmag
1.079
bv
0.298
constellation
Hyi
dist ly
270.2202
luminosity
32.2404
mag
5.67
name
HR 981
spect
F2II-III
var amplitude
0.07
var designation
BN
var max
5.653
var min
5.723

About HR 981

HR 981 is a rare variable star. It lies about 270.2 light-years from Earth, sits in the constellation Hyi, shines at apparent magnitude 5.67 and has spectral type F2II-III.

Its spectrum reads F2II-III — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HR 981 in the constellation Hyi. At apparent magnitude 5.67, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HR 981 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 981 is a rare variable star

HR 981 scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, Naked-eye visible, Yellow-white F-type star, Bright giant, 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.