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Rare variable star 42 EP

HIP 20777

RA 66.7616° · Dec 25.7062° · star

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Score breakdown

· 8 badges
42 pts · Rare
Rare 50 pts → Epic
  • Strongly variable +10
  • Deep red star +8
  • Red dwarf +6
  • Variable star +5
  • Cool red M-type star +5
  • On the zodiac +3
  • A named variable star +3
  • Main-sequence star +2
Total score 42

8 more points to reach Epic.

Badges

  • Variable star · +5
  • On the zodiac · +3
  • Cool red M-type star · +5
  • Main-sequence star · +2
  • Deep red star · +8
  • Red dwarf · +6
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads M0-M3Ve(T) — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.
  • 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 12 you'll want a small backyard telescope, over in Taurus.
  • 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 November — 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. ≈ 2.6 million years at Voyager 1's speed (17 km/s).

Properties

absmag
8.651
bv
1.47
constellation
Tau
dist ly
149.6815
luminosity
0.0302
mag
11.96
name
HIP 20777
spect
M0-M3Ve(T)
var amplitude
0.98
var designation
DF
var max
11.49
var min
12.47

About HIP 20777

HIP 20777 is a rare variable star. It lies about 149.7 light-years from Earth, sits in the constellation Tau, shines at apparent magnitude 11.96 and has spectral type M0-M3Ve(T).

Its spectrum reads M0-M3Ve(T) — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.

How to see it

Look for HIP 20777 in the constellation Tau. At apparent magnitude 11.96, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 20777 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 20777 is a rare variable star

HIP 20777 scores 42 points on Spacedle's rarity scale, which places it in the rare tier. Another 8 points would lift it into a rarer tier.

That score comes from 8 science badges — Variable star, On the zodiac, Cool red M-type star, Main-sequence star, Deep red star, Red dwarf, 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.