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Trash star 14 EP

HIP 21835

RA 70.4028° · Dec -2.4512° · 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

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.

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 9.5 you'll want a small backyard telescope, over in Eridanus.
  • 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 November — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 14.7 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 1.3 million years even at the Parker Solar Probe's 192 km/s.

Properties

absmag
2.435
bv
1.375
constellation
Eri
dist ly
836.2976
luminosity
9.247
mag
9.48
name
HIP 21835
spect
M3

About HIP 21835

HIP 21835 is a trash star. It lies about 836.3 light-years from Earth, sits in the constellation Eri, shines at apparent magnitude 9.48 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 21835 in the constellation Eri. At apparent magnitude 9.48, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 21835 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 21835 is a trash star

HIP 21835 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.