← Back to dex
Common exoplanet 21 EP

eps Tau b

RA 67.1547° · Dec 19.1803° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 3 badges
21 pts · Common
Common 22 pts → Uncommon
  • Its star is visible to the naked eye +12
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 21

1 more point to reach Uncommon.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Its star is visible to the naked eye · +12

Trivia

What it actually is

  • What it is made of. Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

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 3.5 you can see it with your own eyes from a dark site.
  • 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 November — 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. ≈ 2.7 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 242 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
6.13
diameter km
162003.74
discovery facility
Okayama Astrophysical Observatory
discovery method
Radial Velocity
discovery year
2006
dist ly
155.0171
eccentricity
0.076
eq temp k
603.08
host star teff
4877
insolation
22.147
mag
3.523
mass earth
2285.1862
name
eps Tau b
orbital period days
585.82
radius earth
12.7
semi major au
1.878
spect
K0 III
sys num planets
1
sys num stars
1

About eps Tau b

eps Tau b is a common exoplanet. It lies about 155 light-years from Earth, shines at apparent magnitude 3.52, has spectral type K0 III and has an equilibrium temperature near 603 K.

Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

How to see it

At apparent magnitude 3.52, it can be glimpsed with the unaided eye under dark skies.

Like any astronomical target, eps Tau 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 eps Tau b is a common exoplanet

eps Tau b scores 21 points on Spacedle's rarity scale, which places it in the common tier. Another 1 point would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Its star is visible to the naked eye — 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.