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Common exoplanet 21 EP

HIP 105854 b

RA 321.5962° · Dec -37.8295° · exoplanet

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Score breakdown

· 3 badges
21 pts · Common
Common 22 pts → Uncommon
  • Its star is visible to the naked eye +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 21

1 more point to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Its star is visible to the naked eye · +12

Trivia

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 5.6 you can see it with your own eyes from a dark site.
  • 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 August — 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. ≈ 4.5 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 400.5 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
7.16
diameter km
160728.12
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2014
dist ly
256.4829
eccentricity
0.02
eq temp k
822.14
host star teff
4780
insolation
71.2902
mag
5.64
mass earth
2606.1
name
HIP 105854 b
orbital period days
184.2
radius earth
12.6
semi major au
0.81
spect
K2 III
sys num planets
1
sys num stars
1

About HIP 105854 b

HIP 105854 b is a common exoplanet. It lies about 256.5 light-years from Earth, shines at apparent magnitude 5.64, has spectral type K2 III and has an equilibrium temperature near 822 K.

Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

How to see it

At apparent magnitude 5.64, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, HIP 105854 b 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 105854 b is a common exoplanet

HIP 105854 b scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Its star is visible to the naked eye — 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.