← Back to dex
Epic exoplanet 50 EP

HD 219828 c

RA 349.6947° · Dec 18.6458° · exoplanet

Loading sky survey…
🌌 View in 3D star map
Tonight’s visibility

Computing the sky for your location…

Score breakdown

· 7 badges
50 pts · Epic
Epic 78 pts → Anomaly
  • Long-period world +10
  • Eccentric orbit +9
  • Frozen world +8
  • Orbits a Sun-like star +8
  • Multi-planet system +6
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 50

28 more points to reach Anomaly.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Frozen world · +8
  • Long-period world · +10
  • Eccentric orbit · +9
  • Multi-planet system · +6
  • Orbits a Sun-like star · +8

Trivia

What makes it special

  • Frozen world. A deep-frozen world, too far from its star's warmth for anything to stay liquid.

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.
  • 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 8 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 September — that's when to go looking.

Properties

density gcc
15.4
diameter km
155625.64
discovery facility
Multiple Facilities
discovery method
Radial Velocity
discovery year
2016
dist ly
238.4657
eccentricity
0.811
eq temp k
149.17
host star teff
5891
inclination
122.816
insolation
0.0822
mag
8.04
mass earth
5102.4172
name
HD 219828 c
orbital period days
4789.873
radius earth
12.2
semi major au
5.657
spect
G0 IV
sys num planets
2
sys num stars
1

Nearby objects

About HD 219828 c

HD 219828 c is an epic exoplanet. It lies about 238.5 light-years from Earth, shines at apparent magnitude 8.04, has spectral type G0 IV and has an equilibrium temperature near 149 K.

A deep-frozen world, too far from its star's warmth for anything to stay liquid.

How to see it

At apparent magnitude 8.04, it is an easy target for binoculars.

Like any astronomical target, HD 219828 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 HD 219828 c is an epic exoplanet

HD 219828 c scores 50 points on Spacedle's rarity scale, which places it in the epic tier. Another 28 points would lift it into a rarer tier.

That score comes from 7 science badges — Confirmed exoplanet, Gas giant, Frozen world, Long-period world, 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.