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Common exoplanet 19 EP

HIP 90988 b

RA 278.3893° · Dec -50.2117° · exoplanet

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Score breakdown

· 3 badges
19 pts · Common
Common 22 pts → Uncommon
  • Disputed — it may not be there at all +10
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 19

3 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Disputed — it may not be there at all · +10

Trivia

What it actually is

  • 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 7.8 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 June — 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. ≈ 5.4 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 478.9 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

controversial
yes
density gcc
1.53
diameter km
170933.08
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2021
dist ly
306.7005
eccentricity
0.081
eq temp k
400.77
host star teff
4883
insolation
4.1955
mag
7.75
mass earth
668.0753
name
HIP 90988 b
orbital period days
455.7382
radius earth
13.4
semi major au
1.36
spect
K1 III
sys num planets
1
sys num stars
1

About HIP 90988 b

HIP 90988 b is a common exoplanet. It lies about 306.7 light-years from Earth, shines at apparent magnitude 7.75, has spectral type K1 III and has an equilibrium temperature near 401 K.

Lighter than Neptune — a puffed-up ball of hydrogen and helium with no surface anywhere on it to stand on.

How to see it

At apparent magnitude 7.75, it is an easy target for binoculars.

Like any astronomical target, HIP 90988 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 90988 b is a common exoplanet

HIP 90988 b scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 3 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Disputed — it may not be there at all — 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.