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Uncommon variable star 30 EP

HIP 87820

RA 269.0972° · Dec 58.2184° · star

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Score breakdown

· 5 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Deep red star +8
  • Variable star +5
  • Never sets (northern circumpolar) +4
  • A named variable star +3
Total score 30

4 more points to reach Rare.

Badges

  • Variable star · +5
  • Never sets (northern circumpolar) · +4
  • Deep red star · +8
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads Nevar — a carbon star, wrapped in so much soot that its light is filtered to a deep ruby red.
  • 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 you'll want a small backyard telescope, over in Draco.
  • Northern sky. It rides the northern half of the sky — an easier target the further north 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.

Getting there

  • Aboard Voyager 1. ≈ 4.9 million years at Voyager 1's speed (17 km/s).

Properties

absmag
5.346
bv
2.7
constellation
Dra
dist ly
278.0529
luminosity
0.6333
mag
10
name
HIP 87820
spect
Nevar
var amplitude
1.54
var designation
T
var max
9.052
var min
10.592

About HIP 87820

HIP 87820 is an uncommon variable star. It lies about 278.1 light-years from Earth, sits in the constellation Dra, shines at apparent magnitude 10 and has spectral type Nevar.

Its spectrum reads Nevar — 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 87820 in the constellation Dra. At apparent magnitude 10, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 87820 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 87820 is an uncommon variable star

HIP 87820 scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 4 points would lift it into a rarer tier.

That score comes from 5 science badges — Variable star, Never sets (northern circumpolar), 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.