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Epic exoplanet 62 EP

HAT-P-13 c

RA 129.8824° · Dec 47.3519° · exoplanet

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Score breakdown

· 6 badges
62 pts · Epic
Epic 78 pts → Anomaly
  • In the habitable zone +30
  • Eccentric orbit +9
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 62

16 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • In the habitable zone · +30
  • Gas giant · +4
  • Eccentric orbit · +9
  • 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.

Hard to believe

  • Denser than iron. It is packed tighter than solid iron — whatever it is made of, it is not ordinary rock.

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.
  • 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 10.4 you'll want a small backyard telescope.
  • Northern sky. It rides the northern half of the sky — an easier target the further north you are.

Properties

density gcc
13.4
diameter km
156901.26
discovery facility
W. M. Keck Observatory
discovery method
Radial Velocity
discovery year
2009
dist ly
804.9856
eccentricity
0.6616
eq temp k
340
habitable zone
yes
host star teff
5653
insolation
1.4016
mag
10.421
mass earth
4538.421
name
HAT-P-13 c
orbital period days
446.27
radius earth
12.3
semi major au
1.258
spect
G4
sys num planets
2
sys num stars
1

About HAT-P-13 c

HAT-P-13 c is an epic exoplanet. It lies about 805 light-years from Earth, shines at apparent magnitude 10.42, has spectral type G4 and has an equilibrium temperature near 340 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 10.42, a small backyard telescope will bring it into view.

Like any astronomical target, HAT-P-13 c 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 HAT-P-13 c is an epic exoplanet

HAT-P-13 c scores 62 points on Spacedle's rarity scale, which places it in the epic tier. Another 16 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 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.