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Epic exoplanet 53 EP

HIP 65 A b

RA 0.1856° · Dec -54.8308° · exoplanet

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Score breakdown

· 6 badges
53 pts · Epic
Epic 78 pts → Anomaly
  • Lava world +14
  • Ultra-short period +14
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Gas giant +4
  • Found by TESS +4
Total score 53

25 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Lava world · +14
  • Ultra-short period · +14
  • 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.

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.
  • A year in a day. Its entire year is over in 23.5 hours. Birthdays here would come round faster than meals.

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 you'll want a small backyard telescope.
  • Southern sky. It rides the southern half of the sky — an easier target the further south you are.

Properties

density gcc
0.48
diameter km
290258.019
discovery facility
Transiting Exoplanet Survey Satellite (TESS)
discovery method
Transit
discovery year
2020
dist ly
201.5174
eccentricity
0
eq temp k
1411
host star teff
4590
inclination
77.18
insolation
661
mag
11
mass earth
1021.1878
multi star system
yes
name
HIP 65 A b
orbital period days
0.981
radius earth
22.7543
semi major au
0.0178
spect
K4 V
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About HIP 65 A b

HIP 65 A b is an epic exoplanet. It lies about 201.5 light-years from Earth, shines at apparent magnitude 11, has spectral type K4 V and has an equilibrium temperature near 1,411 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, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 65 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 HIP 65 A b is an epic exoplanet

HIP 65 A b scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Lava world, Ultra-short period, 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.