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Epic exoplanet 53 EP

HD 183263 b

RA 292.1023° · Dec 8.3579° · exoplanet

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Score breakdown

· 5 badges
53 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 53

25 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Multi-planet system · +6
  • 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. 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.
  • 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.
  • 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 7.9 it is just past naked-eye reach — ordinary binoculars will pull it in.
  • Seen from everywhere. It sits almost on the celestial equator, so it can be seen from essentially anywhere on Earth.
  • Best time of year. It stands highest in the middle of the night around July — that's when to go looking.

Properties

density gcc
2.7
diameter km
167106.22
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2004
dist ly
176.7619
eccentricity
0.383
eq temp k
263.26
habitable zone
yes
host star teff
5948
inclination
90
insolation
0.8347
mag
7.86
mass earth
1103.1824
name
HD 183263 b
orbital period days
624.874
radius earth
13.1
semi major au
1.46
spect
G2 IV
sys num planets
2
sys num stars
1

Nearby objects

About HD 183263 b

HD 183263 b is an epic exoplanet. It lies about 176.8 light-years from Earth, shines at apparent magnitude 7.86, has spectral type G2 IV and has an equilibrium temperature near 263 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 7.86, it is an easy target for binoculars.

Like any astronomical target, HD 183263 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 183263 b is an epic exoplanet

HD 183263 b scores 53 points on Spacedle's rarity scale, which places it in the epic tier. Another 25 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Multi-planet system 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.