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Uncommon exoplanet 27 EP

HATS-71 b

RA 15.5519° · Dec -61.7561° · exoplanet

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Score breakdown

· 4 badges
27 pts · Uncommon
Uncommon 34 pts → Rare
  • Tidally locked +10
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 27

7 more points to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Tidally locked · +10
  • Orbits a red dwarf · +8

Trivia

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 16.4 it is far too faint for the eye: this one belongs to cameras and long exposures.
  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around October — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.42
diameter km
146415.8677
discovery facility
HATSouth
discovery method
Transit
discovery year
2020
dist ly
457.3523
eccentricity
0
eq temp k
586.8
host star teff
3405
inclination
88.82
insolation
18.0832
mag
16.437
mass earth
117.5971
name
HATS-71 b
orbital period days
3.7955
radius earth
11.478
semi major au
0.0374
spect
M3 V
sys num planets
1
sys num stars
1
tidally locked
yes
tidally locked inferred
yes

About HATS-71 b

HATS-71 b is an uncommon exoplanet. It lies about 457.4 light-years from Earth, shines at apparent magnitude 16.44, has spectral type M3 V and has an equilibrium temperature near 587 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 16.44, it takes a larger telescope or a long-exposure image to capture.

Like any astronomical target, HATS-71 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 HATS-71 b is an uncommon exoplanet

HATS-71 b scores 27 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 7 points would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Tidally locked and Orbits a red dwarf — 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.