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Epic exoplanet 57 EP

BD-08 2823 c

RA 150.1972° · Dec -9.5166° · exoplanet

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Score breakdown

· 5 badges
57 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Puffy low-density world +12
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 57

21 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Puffy low-density world · +12
  • Multi-planet system · +6

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

Hard to believe

  • It would float. It is less dense than water. Drop it in a big enough ocean and the whole world would bob on the surface.

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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.
  • Crowded system. One of at least 2 planets orbiting its star.

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 9.9 you'll want a small backyard telescope.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.

Properties

density gcc
0.293
diameter km
159452.5
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
134.814
eccentricity
0.19
eq temp k
233.85
habitable zone
yes
host star teff
4746
insolation
0.5117
mag
9.86
mass earth
104
name
BD-08 2823 c
orbital period days
237.6
radius earth
12.5
semi major au
0.68
spect
K3 V
sys num planets
2
sys num stars
1

About BD-08 2823 c

BD-08 2823 c is an epic exoplanet. It lies about 134.8 light-years from Earth, shines at apparent magnitude 9.86, has spectral type K3 V and has an equilibrium temperature near 234 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 9.86, a small backyard telescope will bring it into view.

Like any astronomical target, BD-08 2823 c 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 BD-08 2823 c is an epic exoplanet

BD-08 2823 c scores 57 points on Spacedle's rarity scale, which places it in the epic tier. Another 21 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Puffy low-density world and Multi-planet system — 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.