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Uncommon variable star 30 EP

HIP 20587

RA 66.1374° · Dec 4.1234° · star

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Score breakdown

· 6 badges
30 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Distant (over 1,000 light-years) +6
  • Variable star +5
  • On the zodiac +3
  • Yellow-white F-type star +3
  • A named variable star +3
Total score 30

4 more points to reach Rare.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • On the zodiac · +3
  • Yellow-white F-type star · +3
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads F6.2 — an F-type star — a little hotter, whiter and shorter-lived 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 9.7 you'll want a small backyard telescope, over in Taurus.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • 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. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 20.5 million years at Voyager 1's speed (17 km/s).

Properties

absmag
1.966
bv
0.543
constellation
Tau
dist ly
1164.843
luminosity
14.243
mag
9.73
name
HIP 20587
spect
F6.2
var amplitude
0.83
var designation
SW
var max
9.265
var min
10.095

About HIP 20587

HIP 20587 is an uncommon variable star. It lies about 1,164.8 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 9.73 and has spectral type F6.2.

Its spectrum reads F6.2 — an F-type star — a little hotter, whiter and shorter-lived than the Sun.

How to see it

Look for HIP 20587 in the constellation Tau. At apparent magnitude 9.73, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 20587 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 20587 is an uncommon variable star

HIP 20587 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 6 science badges — Variable star, Distant (over 1,000 light-years), On the zodiac, Yellow-white F-type 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.