About HIP 21906
HIP 21906 is a trash star. It lies about 236.3 light-years from Earth, sits in the constellation Eri and shines at apparent magnitude 11.03.
Its colour puts the surface at roughly 5570 K, against the Sun's 5778 K.
Trash star 3 EP
HIP 21906
RA 70.6566° · Dec -13.2384° · star
Score breakdown
· 1 badgeTrash 15 pts → Common
- Star +3
Total score 3
12 more points to reach Common.
Badges
- Star · +3
Trivia
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 11 you'll want a small backyard telescope, over in Eridanus.
- 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 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. ≈ 4.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 369 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 2363 years in a starship at a tenth of light speed.
Properties
- absmag
- 6.729
- bv
- 0.709
- constellation
- Eri
- dist ly
- 236.345
- luminosity
- 0.1772
- mag
- 11.03
- name
- HIP 21906
How to see it
Look for HIP 21906 in the constellation Eri. At apparent magnitude 11.03, a small backyard telescope will bring it into view.
Like any astronomical target, HIP 21906 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 21906 is a trash star
HIP 21906 scores 3 points on Spacedle's rarity scale, which places it in the trash tier. Another 12 points would lift it into a rarer tier.
That score comes from 1 science badge — 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.