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Rare exoplanet 48 EP

HAT-P-2 b

RA 245.1514° · Dec 41.0480° · exoplanet

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Score breakdown

· 6 badges
48 pts · Rare
Rare 50 pts → Epic
  • Lava world +14
  • Tidally locked +10
  • Eccentric orbit +9
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 48

2 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Eccentric orbit · +9
  • Tidally locked · +10
  • Multi-planet system · +6

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.
  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.
  • 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 8.7 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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.

Properties

density gcc
7.29
diameter km
135978.0178
discovery facility
HATNet
discovery method
Transit
discovery year
2007
dist ly
416.7426
eccentricity
0.5172
eq temp k
1540
host star teff
6380
inclination
86.16
insolation
588.518
mag
8.72
mass earth
2866.8122
name
HAT-P-2 b
orbital period days
5.6335
radius earth
10.6598
semi major au
0.0681
spect
F8
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HAT-P-2 b

HAT-P-2 b is a rare exoplanet. It lies about 416.7 light-years from Earth, shines at apparent magnitude 8.72, has spectral type F8 and has an equilibrium temperature near 1,540 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 8.72, it is an easy target for binoculars.

Like any astronomical target, HAT-P-2 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 HAT-P-2 b is a rare exoplanet

HAT-P-2 b scores 48 points on Spacedle's rarity scale, which places it in the rare tier. Another 2 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Lava world, Eccentric orbit, Tidally locked 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.