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Anomaly exoplanet 68 EP

HD 20782 b

RA 50.0166° · Dec -28.8544° · exoplanet

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Score breakdown

· 6 badges
68 pts · Anomaly
Anomaly 95 pts → Mythic
  • In the habitable zone +30
  • Richly packed system +14
  • Eccentric orbit +9
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 68

27 more points to reach Mythic.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Eccentric orbit · +9
  • Multi-planet system · +6
  • Richly packed system · +14

Trivia

What makes it special

  • Goldilocks zone. Sits where it's neither too hot nor too cold — liquid water could exist.
  • Packed system. Crammed into a system of five or more planets.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 2.1 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 183.3 thousand years even at the Parker Solar Probe's 192 km/s.
  • At 10% light speed. ≈ 1174 years in a starship at a tenth of light speed.
  • Distance. 117 light-years from Earth.

Look-back time

  • Look-back time. The light you'd see left around the year 1909.

Saying hello

  • Say hello. A radio message and its reply would take 235 years round-trip.

Standing on it

  • A year here. A full year lasts just 597 Earth days.

By the numbers

  • Size. About 13.6× the width of Earth.
  • Volume. About 2515 Earths could fit inside it.
  • Mass. Roughly 473× Earth's mass — about 1.5 Jupiters.
  • Your weight. You'd weigh about 2.6× your Earth weight standing here.
  • Temperature. A surprisingly temperate -20°C average.

How we found it

  • Discovery. Found by Anglo-Australian Telescope using the radial velocity method.

Cosmic context

  • Crowded system. One of at least 5 planets orbiting its star.
  • Wild orbit. Its highly elliptical path swings between scorching and frozen each lap.

Properties

density gcc
1.03
discovery facility
Anglo-Australian Telescope
discovery method
Radial Velocity
dist ly
117.3718
eccentricity
0.95
eq temp k
253.34
habitable zone
yes
insolation
0.6863
mass earth
472.83
name
HD 20782 b
orbital period days
597.0643
radius earth
13.6
sys num planets
5

About HD 20782 b

HD 20782 b is an anomaly exoplanet. It lies about 117.4 light-years from Earth, has an equilibrium temperature near 253 K, spans roughly 13.6 Earth radii and weighs about 472.83 Earth masses.

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

How to see it

Like any astronomical target, HD 20782 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 20782 b is an anomaly exoplanet

HD 20782 b scores 68 points on Spacedle's rarity scale, which places it in the anomaly tier. Another 27 points would lift it into a rarer tier.

That score comes from 6 science badges — Confirmed exoplanet, In the habitable zone, Gas giant, Eccentric orbit, Multi-planet system and Richly packed 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.

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Sky imagery and survey data courtesy of Aladin Lite & CDS, Strasbourg. Object data from the NASA Exoplanet Archive, JPL Small-Body Database, and the ATNF Pulsar Catalogue.