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Uncommon star 22 EP

HD 287516

RA 77.2035° · Dec 2.1256° · star

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Score breakdown

· 5 badges
22 pts · Uncommon
Uncommon 34 pts → Rare
  • Deep red star +8
  • In Orion's hunting ground +6
  • Star +3
  • Orange K-type star +3
  • Main-sequence star +2
Total score 22

12 more points to reach Rare.

Badges

  • Star · +3
  • In Orion's hunting ground · +6
  • Orange K-type star · +3
  • Main-sequence star · +2
  • Deep red star · +8

Trivia

Hard to believe

  • True brightness. It pours out about 765.6 thousand times as much light as the Sun. It only looks ordinary because it is so far away.

What it actually is

  • Spectral class. Its spectrum reads K5V — 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.

Find it in the sky

  • How to spot it. At magnitude 10.1 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.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out deep orange-red (B−V 1.4) — one of the coolest surfaces a star can have while still fusing.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 3910 K, against the Sun's 5778 K.

Properties

absmag
-9.88
bv
1.423
constellation
Ori
luminosity
779830.1105
mag
10.12
name
HD 287516
spect
K5V

About HD 287516

HD 287516 is an uncommon star. It sits in the constellation Ori, shines at apparent magnitude 10.12 and has spectral type K5V.

Its spectrum reads K5V — a K-type star. Orange K dwarfs are the marathon runners of the galaxy, burning steadily for tens of billions of years.

How to see it

Look for HD 287516 in the constellation Ori. At apparent magnitude 10.12, a small backyard telescope will bring it into view.

Like any astronomical target, HD 287516 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 287516 is an uncommon star

HD 287516 scores 22 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 12 points would lift it into a rarer tier.

That score comes from 5 science badges — Star, In Orion's hunting ground, Orange K-type star, Main-sequence star and Deep red 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.