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Epic exoplanet 67 EP

TrES-4 b

RA 268.3043° · Dec 37.2117° · exoplanet

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Score breakdown

· 8 badges
67 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Puffy low-density world +12
  • Two suns in its sky +12
  • Tidally locked +10
  • Distant (over 1,000 light-years) +6
  • Confirmed exoplanet +5
  • Gas giant +4
  • Blasted by starlight +4
Total score 67

11 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Distant (over 1,000 light-years) · +6
  • Gas giant · +4
  • Lava world · +14
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Blasted by starlight · +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.

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

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

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 11.9 you'll want a small backyard telescope.
  • 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 June — that's when to go looking.

Properties

density gcc
0.099
diameter km
230204.6357
discovery facility
TrES
discovery method
Transit
discovery year
2007
dist ly
1682.8997
eccentricity
0
eq temp k
1778
host star teff
6200
inclination
82.81
insolation
2276.295
mag
11.932
mass earth
247.9074
multi star system
yes
name
TrES-4 b
orbital period days
3.5539
radius earth
18.0465
semi major au
0.0508
spect
F8 V
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About TrES-4 b

TrES-4 b is an epic exoplanet. It lies about 1,682.9 light-years from Earth, shines at apparent magnitude 11.93, has spectral type F8 V and has an equilibrium temperature near 1,778 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 11.93, a small backyard telescope will bring it into view.

Like any astronomical target, TrES-4 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 TrES-4 b is an epic exoplanet

TrES-4 b scores 67 points on Spacedle's rarity scale, which places it in the epic tier. Another 11 points would lift it into a rarer tier.

That score comes from 8 science badges — Confirmed exoplanet, Distant (over 1,000 light-years), Gas giant, Lava world, Tidally locked, Puffy low-density world, Blasted by starlight 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.