← Back to dex
Rare variable star 35 EP

HD 287841

RA 81.1783° · Dec 1.7301° · star

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 7 badges
35 pts · Rare
Rare 50 pts → Epic
  • Distant (over 1,000 light-years) +6
  • In Orion's hunting ground +6
  • Giant star +6
  • Variable star +5
  • White A-type star +5
  • Gently variable +4
  • A named variable star +3
Total score 35

15 more points to reach Epic.

Badges

  • Variable star · +5
  • Distant (over 1,000 light-years) · +6
  • In Orion's hunting ground · +6
  • White A-type star · +5
  • Giant star · +6
  • Gently variable · +4
  • A named variable star · +3

Trivia

What it actually is

  • Spectral class. Its spectrum reads A5III:var — 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 a giant. It has already exhausted its core hydrogen and swollen up enormously in response.
  • 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 10.2 you'll want a small backyard telescope, over in Orion.
  • 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 December — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Properties

absmag
1.79
bv
0.199
constellation
Ori
dist ly
1575.6329
luminosity
16.7494
mag
10.21
name
HD 287841
spect
A5III:var
var amplitude
0.14
var designation
V346
var max
10.146
var min
10.286

About HD 287841

HD 287841 is a rare variable star. It lies about 1,575.6 light-years from Earth, sits in the constellation Ori, shines at apparent magnitude 10.21 and has spectral type A5III:var.

Its spectrum reads A5III:var — 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 HD 287841 in the constellation Ori. At apparent magnitude 10.21, a small backyard telescope will bring it into view.

Like any astronomical target, HD 287841 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 HD 287841 is a rare variable star

HD 287841 scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 15 points would lift it into a rarer tier.

That score comes from 7 science badges — Variable star, Distant (over 1,000 light-years), In Orion's hunting ground, White A-type star, Giant 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.