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Rare exoplanet 43 EP

CFBDSIR J145829+101343 b

RA 224.6208° · Dec 10.2286° · exoplanet

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Score breakdown

· 5 badges
43 pts · Rare
Rare 50 pts → Epic
  • Directly imaged +16
  • Long-period world +10
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 43

7 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Long-period world · +10
  • Directly imaged · +16
  • Orbits a red dwarf · +8

Trivia

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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

Find it in the sky

  • Northern sky. It rides the northern half of the sky — an easier target the further north 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. ≈ 1.3 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 117.6 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
9.62
diameter km
158176.88
discovery facility
W. M. Keck Observatory
discovery method
Imaging
discovery year
2011
dist ly
75.342
eq temp k
370
host star teff
580.5
mass earth
3337.1
name
CFBDSIR J145829+101343 b
orbital period days
10037.5
radius earth
12.4
semi major au
2.6
sys num planets
1
sys num stars
1

Nearby objects

About CFBDSIR J145829+101343 b

CFBDSIR J145829+101343 b is a rare exoplanet. It lies about 75.3 light-years from Earth, has an equilibrium temperature near 370 K, spans roughly 12.4 Earth radii and weighs about 3,337.1 Earth masses.

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

How to see it

Like any astronomical target, CFBDSIR J145829+101343 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 CFBDSIR J145829+101343 b is a rare exoplanet

CFBDSIR J145829+101343 b scores 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 7 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Long-period world, Directly imaged 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.