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Uncommon exoplanet 25 EP

IC 4651 9122 b

RA 261.2086° · Dec -49.9489° · exoplanet

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Score breakdown

· 4 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Disputed — it may not be there at all +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 25

9 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Disputed — it may not be there at all · +10

Trivia

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

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 10.9 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 June — that's when to go looking.

Could we get there?

  • Verdict. Impossible with our current technology — and the next millennium of it.

Getting there

  • Aboard Voyager 1. ≈ 49.3 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 4.4 million years even at the Parker Solar Probe's 192 km/s.

Properties

controversial
yes
density gcc
5.37
diameter km
162003.74
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2018
dist ly
2802.7368
eccentricity
0.18
eq temp k
513.04
host star teff
4740.1
insolation
10.4109
mag
10.909
mass earth
2002.329
name
IC 4651 9122 b
orbital period days
734
radius earth
12.7
semi major au
2.038
sys num planets
1
sys num stars
1

About IC 4651 9122 b

IC 4651 9122 b is an uncommon exoplanet. It lies about 2,802.7 light-years from Earth, shines at apparent magnitude 10.91, has an equilibrium temperature near 513 K and spans roughly 12.7 Earth radii.

Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.

How to see it

At apparent magnitude 10.91, a small backyard telescope will bring it into view.

Like any astronomical target, IC 4651 9122 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 IC 4651 9122 b is an uncommon exoplanet

IC 4651 9122 b scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant and Disputed — it may not be there at all — 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.