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Trash star 14 EP

HIP 39787

RA 121.9604° · Dec -4.5224° · star

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Score breakdown

· 3 badges
14 pts · Trash
Trash 15 pts → Common
  • Red dwarf +6
  • Cool red M-type star +5
  • Star +3
Total score 14

1 more point to reach Common.

Badges

  • Star · +3
  • Cool red M-type star · +5
  • Red dwarf · +6

Trivia

Hard to believe

  • True brightness. It pours out about 280.5 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 M3 — an M-type red star — and M stars are the silent majority: roughly three of every four stars in the galaxy are one.

Find it in the sky

  • How to spot it. At magnitude 11.2 you'll want a small backyard telescope, over in Monoceros.
  • 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 January — that's when to go looking.

Its true colour

  • Its true colour. Measured through blue and visual filters it comes out yellow-white (B−V 0.4) — a shade brighter and crisper than our own Sun.
  • Why no green stars. No star ever looks green: a surface hot enough to peak in green also floods out plenty of red and blue, and your eye blends the mixture back to white.

By the numbers

  • Surface temperature. Its colour puts the surface at roughly 6980 K, against the Sun's 5778 K.

Properties

absmag
-8.79
bv
0.382
constellation
Mon
luminosity
285759.0543
mag
11.21
name
HIP 39787
spect
M3

About HIP 39787

HIP 39787 is a trash star. It sits in the constellation Mon, shines at apparent magnitude 11.21 and has spectral type M3.

Its spectrum reads M3 — 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 39787 in the constellation Mon. At apparent magnitude 11.21, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 39787 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 39787 is a trash star

HIP 39787 scores 14 points on Spacedle's rarity scale, which places it in the trash tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Star, Cool red M-type star and Red dwarf — 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.