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Common exoplanet 17 EP

HIP 79431 b

RA 243.1742° · Dec -18.8764° · exoplanet

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Score breakdown

· 3 badges
17 pts · Common
Common 22 pts → Uncommon
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 17

5 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Orbits a red dwarf · +8

Trivia

What it actually is

  • What it is made of. Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

Sense of scale

  • In perspective. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 11.4 you'll want a small backyard telescope.
  • 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 May — 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. ≈ 832.9 thousand years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 74 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
1.52
diameter km
170933.08
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
47.3983
eccentricity
0.29
eq temp k
177.42
host star teff
3191
insolation
0.2179
mag
11.394
mass earth
667.415
name
HIP 79431 b
orbital period days
111.7
radius earth
13.4
semi major au
0.36
spect
M3 V
sys num planets
1
sys num stars
1

About HIP 79431 b

HIP 79431 b is a common exoplanet. It lies about 47.4 light-years from Earth, shines at apparent magnitude 11.39, has spectral type M3 V and has an equilibrium temperature near 177 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 11.39, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 79431 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 79431 b is a common exoplanet

HIP 79431 b scores 17 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Orbits a 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.