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Uncommon variable star 32 EP

GL GJ 3831A

RA 213.5890° · Dec -15.3560° · star

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Score breakdown

· 7 badges
32 pts · Uncommon
Uncommon 34 pts → Rare
  • Strongly variable +10
  • Binary star +6
  • Variable star +5
  • On the zodiac +3
  • Orange K-type star +3
  • A named variable star +3
  • Main-sequence star +2
Total score 32

2 more points to reach Rare.

Badges

  • Variable star · +5
  • Binary star · +6
  • On the zodiac · +3
  • Orange K-type star · +3
  • Main-sequence star · +2
  • Strongly variable · +10
  • A named variable star · +3

Trivia

What makes it special

  • Not one star but two. It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

What it actually is

  • Spectral class. Its spectrum reads K4V — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.
  • 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. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 10.4 you'll want a small backyard telescope, over in Virgo.
  • 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 April — that's when to go looking.

Properties

absmag
7.992
binary
yes
bv
1.27
constellation
Vir
dist ly
98.4176
luminosity
0.0554
mag
10.39
name
GL GJ 3831A
spect
K4V
var amplitude
1.68
var designation
MV
var max
10.27
var min
11.95

About GL GJ 3831A

GL GJ 3831A is an uncommon variable star. It lies about 98.4 light-years from Earth, sits in the constellation Vir, shines at apparent magnitude 10.39 and has spectral type K4V.

It is a binary: two stars orbiting a shared centre of mass. More than half of all the 'stars' you can see are actually multiple systems.

How to see it

Look for GL GJ 3831A in the constellation Vir. At apparent magnitude 10.39, a small backyard telescope will bring it into view.

Like any astronomical target, GL GJ 3831A 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 GL GJ 3831A is an uncommon variable star

GL GJ 3831A scores 32 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 2 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Binary star, On the zodiac, Orange K-type star, Main-sequence 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.