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Common exoplanet 15 EP

HD 75898 b

RA 133.4612° · Dec 33.0567° · exoplanet

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Score breakdown

· 3 badges
15 pts · Common
Common 22 pts → Uncommon
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 15

7 more points to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Multi-planet system · +6

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.
  • Crowded system. One of at least 2 planets orbiting its star.

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 8 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.
  • Best time of year. It stands highest in the middle of the night around February — 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. ≈ 4.5 million years at Voyager 1's speed (17 km/s).

Properties

density gcc
1.94
diameter km
168381.84
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2007
dist ly
254.5664
eccentricity
0.105
eq temp k
335.16
host star teff
6122
insolation
1.9945
mag
8.03
mass earth
810.4624
name
HD 75898 b
orbital period days
422.82
radius earth
13.2
semi major au
1.2025
spect
F8 V
sys num planets
2
sys num stars
1

About HD 75898 b

HD 75898 b is a common exoplanet. It lies about 254.6 light-years from Earth, shines at apparent magnitude 8.03, has spectral type F8 V and has an equilibrium temperature near 335 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 8.03, it is an easy target for binoculars.

Like any astronomical target, HD 75898 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 75898 b is a common exoplanet

HD 75898 b scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 7 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Multi-planet system — 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.