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Rare exoplanet 45 EP

BD+05 4868 A b

RA 326.8614° · Dec 6.6053° · exoplanet

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Score breakdown

· 5 badges
45 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Two suns in its sky +12
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Found by TESS +4
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Lava world · +14
  • Tidally locked · +10
  • Found by TESS · +4
  • Two suns in its sky · +12

Trivia

What makes it special

  • Lava world. Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

What it actually is

  • Hugging its star. It orbits closer to its star than Mercury does to the Sun, completing a lap in less time than Mercury takes.

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 10.2 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.
  • 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. ≈ 2.5 million years at Voyager 1's speed (17 km/s).

Properties

discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2025
dist ly
142.1019
eq temp k
1820
host star teff
4596
insolation
443.787
mag
10.158
mass earth
6.2
multi star system
yes
name
BD+05 4868 A b
orbital period days
1.2719
semi major au
0.0208
spect
K V
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About BD+05 4868 A b

BD+05 4868 A b is a rare exoplanet. It lies about 142.1 light-years from Earth, shines at apparent magnitude 10.16, has spectral type K V and has an equilibrium temperature near 1,820 K.

Its surface is almost certainly an ocean of molten rock, kept liquid by the star it hugs.

How to see it

At apparent magnitude 10.16, a small backyard telescope will bring it into view.

Like any astronomical target, BD+05 4868 A 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 BD+05 4868 A b is a rare exoplanet

BD+05 4868 A b scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Lava world, Tidally locked, Found by TESS and Two suns in its sky — 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.