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Rare exoplanet 39 EP

HIP 71135 b

RA 218.2158° · Dec -52.6465° · exoplanet

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Score breakdown

· 3 badges
39 pts · Rare
Rare 50 pts → Epic
  • In the habitable zone +30
  • Confirmed exoplanet +5
  • Neptune-like +4
Total score 39

11 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Neptune-like · +4

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

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.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.

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 10.5 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.
  • Best time of year. It stands highest in the middle of the night around April — that's when to go looking.

Properties

density gcc
1.1
diameter km
58040.71
discovery facility
Las Campanas Observatory
discovery method
Radial Velocity
discovery year
2019
dist ly
105.4498
eccentricity
0.21
eq temp k
285.11
habitable zone
yes
host star teff
4146
insolation
1.1013
mag
10.53
mass earth
18.8
name
HIP 71135 b
orbital period days
87.19
radius earth
4.55
semi major au
0.335
spect
M1
sys num planets
1
sys num stars
1

About HIP 71135 b

HIP 71135 b is a rare exoplanet. It lies about 105.4 light-years from Earth, shines at apparent magnitude 10.53, has spectral type M1 and has an equilibrium temperature near 285 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 10.53, a small backyard telescope will bring it into view.

Like any astronomical target, HIP 71135 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 71135 b is a rare exoplanet

HIP 71135 b scores 39 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, In the habitable zone and Neptune-like — 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.