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Uncommon variable star 25 EP

HR 2001

RA 86.8620° · Dec -10.5330° · star

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Score breakdown

· 6 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • In Orion's hunting ground +6
  • Variable star +5
  • White A-type star +5
  • Gently variable +4
  • A named variable star +3
  • Main-sequence star +2
Total score 25

9 more points to reach Rare.

Badges

  • Variable star · +5
  • In Orion's hunting ground · +6
  • White A-type star · +5
  • Main-sequence star · +2
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A4V — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.
  • 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 6 it is just past naked-eye reach — ordinary binoculars will pull it in, over in Orion.
  • 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 December — that's when to go looking.

Could we get there?

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

Properties

absmag
-0.518
bv
0.135
constellation
Ori
dist ly
668.3524
luminosity
140.346
mag
6.04
name
HR 2001
spect
A4V
var amplitude
0.35
var designation
V1031
var max
6.011
var min
6.361

About HR 2001

HR 2001 is an uncommon variable star. It lies about 668.4 light-years from Earth, sits in the constellation Ori, shines at apparent magnitude 6.04 and has spectral type A4V.

Its spectrum reads A4V — an A-type star: white-hot, typically about twice the Sun's mass, and the class most of the sky's famous bright stars belong to.

How to see it

Look for HR 2001 in the constellation Ori. At apparent magnitude 6.04, it is an easy target for binoculars.

Like any astronomical target, HR 2001 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 HR 2001 is an uncommon variable star

HR 2001 scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 6 science badges — Variable star, In Orion's hunting ground, White A-type star, Main-sequence star, Gently 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.