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Uncommon exoplanet 25 EP

HAT-P-11 b

RA 297.7102° · Dec 48.0819° · exoplanet

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Score breakdown

· 4 badges
25 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Neptune-like +4
Total score 25

9 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Neptune-like · +4
  • Tidally locked · +10
  • Multi-planet system · +6

Trivia

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.
  • 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 9.5 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 July — that's when to go looking.

Could we get there?

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

Properties

density gcc
1.172
diameter km
55617.032
discovery facility
HATNet
discovery method
Transit
discovery year
2010
dist ly
123.1718
eccentricity
0.251
eq temp k
838
host star teff
4653
inclination
89.027
insolation
100.77
mag
9.46
mass earth
25
name
HAT-P-11 b
orbital period days
4.888
radius earth
4.36
semi major au
0.0526
spect
K4
sys num planets
2
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HAT-P-11 b

HAT-P-11 b is an uncommon exoplanet. It lies about 123.2 light-years from Earth, shines at apparent magnitude 9.46, has spectral type K4 and has an equilibrium temperature near 838 K.

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

How to see it

At apparent magnitude 9.46, a small backyard telescope will bring it into view.

Like any astronomical target, HAT-P-11 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-11 b is an uncommon exoplanet

HAT-P-11 b scores 25 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 9 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Neptune-like, 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.