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Uncommon exoplanet 33 EP

91 Aqr b

RA 348.9745° · Dec -9.0878° · exoplanet

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Score breakdown

· 4 badges
33 pts · Uncommon
Uncommon 34 pts → Rare
  • Its star is visible to the naked eye +12
  • Two suns in its sky +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 33

1 more point to reach Rare.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Its star is visible to the naked eye · +12
  • Two suns in its sky · +12

Trivia

What it actually is

  • What it is made of. Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

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 4.2 you can see it with your own eyes from a dark site.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around September — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 2.5 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 224.2 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
2.49
diameter km
167106.22
discovery facility
Lick Observatory
discovery method
Radial Velocity
discovery year
2013
dist ly
143.6078
eccentricity
0.027
eq temp k
891.73
host star teff
4665
insolation
100.506
mag
4.2395
mass earth
1017
multi star system
yes
name
91 Aqr b
orbital period days
181.4
radius earth
13.1
semi major au
0.7
spect
K0 III
sys num planets
1
sys num stars
3

About 91 Aqr b

91 Aqr b is an uncommon exoplanet. It lies about 143.6 light-years from Earth, shines at apparent magnitude 4.24, has spectral type K0 III and has an equilibrium temperature near 892 K.

Too light to be solid rock and too heavy to be all gas: most likely a deep global ocean or a thick steamy envelope over a rocky core.

How to see it

At apparent magnitude 4.24, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, 91 Aqr 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 91 Aqr b is an uncommon exoplanet

91 Aqr b scores 33 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 1 point would lift it into a rarer tier.

That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Its star is visible to the naked eye 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.