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Epic exoplanet 71 EP

HD 75289 b

RA 131.9182° · Dec -41.7378° · exoplanet

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Score breakdown

· 7 badges
71 pts · Epic
Epic 78 pts → Anomaly
  • Found before the year 2000 +18
  • Puffy low-density world +12
  • Two suns in its sky +12
  • Hot Jupiter +10
  • Tidally locked +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 71

7 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Hot Jupiter · +10
  • Tidally locked · +10
  • Puffy low-density world · +12
  • Two suns in its sky · +12
  • Found before the year 2000 · +18

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. Inside our stellar backyard: every radio broadcast humanity has ever made has already swept past it.

Find it in the sky

  • How to spot it. At magnitude 6.3 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • 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 January — that's when to go looking.

Could we get there?

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

Properties

density gcc
0.299
diameter km
181138.04
discovery facility
La Silla Observatory
discovery method
Radial Velocity
discovery year
1999
dist ly
94.9629
eccentricity
0.03
eq temp k
1260
host star teff
6117
insolation
821.3488
mag
6.35
mass earth
155.7367
multi star system
yes
name
HD 75289 b
orbital period days
3.5093
radius earth
14.2
semi major au
0.05
spect
G0
sys num planets
1
sys num stars
2
tidally locked
yes
tidally locked inferred
yes

About HD 75289 b

HD 75289 b is an epic exoplanet. It lies about 95 light-years from Earth, shines at apparent magnitude 6.35, has spectral type G0 and has an equilibrium temperature near 1,260 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 6.35, it is an easy target for binoculars.

Like any astronomical target, HD 75289 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 HD 75289 b is an epic exoplanet

HD 75289 b scores 71 points on Spacedle's rarity scale, which places it in the epic tier. Another 7 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Tidally locked, Puffy low-density world, Two suns in its sky and Found before the year 2000 — 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.