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Epic exoplanet 55 EP

HD 203030 b

RA 319.7432° · Dec 26.2306° · exoplanet

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Score breakdown

· 6 badges
55 pts · Epic
Epic 78 pts → Anomaly
  • Directly imaged +16
  • Orbits beyond Neptune's distance +12
  • Hot Jupiter +10
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 55

23 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Hot Jupiter · +10
  • Directly imaged · +16
  • Orbits a Sun-like star · +8
  • Orbits beyond Neptune's distance · +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 8.4 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 August — 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. ≈ 2.2 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 199.9 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
6.35
diameter km
184449.3595
discovery facility
Palomar Observatory
discovery method
Imaging
discovery year
2006
dist ly
128.0172
eq temp k
1040
host star teff
5603
insolation
0
mag
8.45
mass earth
3496.1125
name
HD 203030 b
radius earth
14.4596
semi major au
487.1
spect
G8 V
sys num planets
1
sys num stars
1

About HD 203030 b

HD 203030 b is an epic exoplanet. It lies about 128 light-years from Earth, shines at apparent magnitude 8.45, has spectral type G8 V and has an equilibrium temperature near 1,040 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 8.45, it is an easy target for binoculars.

Like any astronomical target, HD 203030 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 203030 b is an epic exoplanet

HD 203030 b scores 55 points on Spacedle's rarity scale, which places it in the epic tier. Another 23 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter, Directly imaged, Orbits a Sun-like star and Orbits beyond Neptune's distance — 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.