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Rare variable star 36 EP

HIP 89739

RA 274.7134° · Dec -46.5482° · star

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Score breakdown

· 4 badges
36 pts · Rare
Rare 50 pts → Epic
  • Dramatic variable (over 2 magnitudes) +20
  • Deep red star +8
  • Variable star +5
  • A named variable star +3
Total score 36

14 more points to reach Epic.

Badges

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

Trivia

What it actually is

  • Spectral class. Its spectrum reads R4v — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • Where it is in life. It is on the main sequence, quietly fusing hydrogen in its core exactly as the Sun does.
  • 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 10.7 you'll want a small backyard telescope, over in Telescopium.
  • 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 June — that's when to go looking.

Could we get there?

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

Properties

absmag
3.523
bv
2.1
constellation
Tel
dist ly
876.7634
luminosity
3.3947
mag
10.67
name
HIP 89739
spect
R4v
var amplitude
2.37
var designation
RS
var max
9.999
var min
12.369

About HIP 89739

HIP 89739 is a rare variable star. It lies about 876.8 light-years from Earth, sits in the constellation Tel, shines at apparent magnitude 10.67 and has spectral type R4v.

Its spectrum reads R4v — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.

How to see it

Look for HIP 89739 in the constellation Tel. At apparent magnitude 10.67, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 89739 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 89739 is a rare variable star

HIP 89739 scores 36 points on Spacedle's rarity scale, which places it in the rare tier. Another 14 points would lift it into a rarer tier.

That score comes from 4 science badges — Variable star, 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.