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Epic exoplanet 51 EP

HD 106906 b

RA 184.4713° · Dec -55.9756° · exoplanet

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Score breakdown

· 5 badges
51 pts · Epic
Epic 78 pts → Anomaly
  • Directly imaged +16
  • Lava world +14
  • Orbits beyond Neptune's distance +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 51

27 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Directly imaged · +16
  • Orbits beyond Neptune's distance · +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.

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. 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 7.8 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 March — that's when to go looking.

Could we get there?

  • Verdict. Hopelessly far for any craft humanity can build today.

Properties

density gcc
10.1
diameter km
158176.88
discovery facility
Las Campanas Observatory
discovery method
Imaging
discovery year
2013
dist ly
336.0353
eq temp k
1800
host star teff
6516
insolation
0
mag
7.8
mass earth
3496
name
HD 106906 b
radius earth
12.4
semi major au
650
spect
F5 V
sys num planets
1
sys num stars
1

About HD 106906 b

HD 106906 b is an epic exoplanet. It lies about 336 light-years from Earth, shines at apparent magnitude 7.8, has spectral type F5 V and has an equilibrium temperature near 1,800 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 7.8, it is an easy target for binoculars.

Like any astronomical target, HD 106906 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 HD 106906 b is an epic exoplanet

HD 106906 b scores 51 points on Spacedle's rarity scale, which places it in the epic tier. Another 27 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Lava world, Directly imaged and Orbits beyond Neptune's distance — 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.