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Epic exoplanet 56 EP

HD 190228 b

RA 300.7537° · Dec 28.3066° · exoplanet

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Score breakdown

· 5 badges
56 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Eccentric orbit +9
  • Orbits a Sun-like star +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 56

22 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Eccentric orbit · +9
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

What it actually is

  • What it is made of. Its density says rock, though lighter than Earth's mix: probably less iron, or a thick shell of water and ice over the top.
  • What the zone means. The habitable zone is only about temperature: it is the band where liquid water could survive on a surface. It is a promising address, not evidence of anything living.

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 7.3 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 July — that's when to go looking.

Could we get there?

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

Properties

density gcc
4.09
diameter km
164554.98
discovery facility
Multiple Observatories
discovery method
Radial Velocity
discovery year
2022
dist ly
204.5474
eccentricity
0.559
eq temp k
267.99
habitable zone
yes
host star teff
5360
inclination
94.987
insolation
0.8598
mag
7.3
mass earth
1598.6769
name
HD 190228 b
orbital period days
1143.5986
radius earth
12.9
semi major au
2.406
spect
G5 IV
sys num planets
1
sys num stars
1

About HD 190228 b

HD 190228 b is an epic exoplanet. It lies about 204.5 light-years from Earth, shines at apparent magnitude 7.3, has spectral type G5 IV and has an equilibrium temperature near 268 K.

Sits where it's neither too hot nor too cold — liquid water could exist on a surface here.

How to see it

At apparent magnitude 7.3, it is an easy target for binoculars.

Like any astronomical target, HD 190228 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 190228 b is an epic exoplanet

HD 190228 b scores 56 points on Spacedle's rarity scale, which places it in the epic tier. Another 22 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Eccentric orbit and Orbits a Sun-like star — 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.