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Rare exoplanet 45 EP

CHXR 73 b

RA 166.6194° · Dec -77.6259° · exoplanet

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Score breakdown

· 5 badges
45 pts · Rare
Rare 50 pts → Epic
  • Directly imaged +16
  • Orbits beyond Neptune's distance +12
  • Orbits a red dwarf +8
  • Confirmed exoplanet +5
  • Gas giant +4
Total score 45

5 more points to reach Epic.

Badges

  • Confirmed exoplanet · +5
  • Gas giant · +4
  • Directly imaged · +16
  • Orbits a red dwarf · +8
  • Orbits beyond Neptune's distance · +12

Trivia

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.

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

  • Southern sky only. So far south it never rises for most of the northern hemisphere. To see it you'd have to travel to Chile, South Africa or Australia.
  • Best time of year. It stands highest in the middle of the night around March — that's when to go looking.

Could we get there?

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

Getting there

  • Aboard Voyager 1. ≈ 10.9 million years at Voyager 1's speed (17 km/s).
  • Fastest probe ever. ≈ 969.5 thousand years even at the Parker Solar Probe's 192 km/s.

Properties

density gcc
11.8
diameter km
156901.26
discovery facility
Hubble Space Telescope
discovery method
Imaging
discovery year
2006
dist ly
620.9162
host star teff
3099
mass earth
3994.486
name
CHXR 73 b
radius earth
12.3
semi major au
210
spect
M3.5
sys num planets
1
sys num stars
1

Nearby objects

About CHXR 73 b

CHXR 73 b is a rare exoplanet. It lies about 620.9 light-years from Earth, has spectral type M3.5, spans roughly 12.3 Earth radii and weighs about 3,994.49 Earth masses.

Denser than Earth — a solid world of rock and iron, with no meaningful atmosphere to speak of by mass.

How to see it

Like any astronomical target, CHXR 73 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 CHXR 73 b is a rare exoplanet

CHXR 73 b scores 45 points on Spacedle's rarity scale, which places it in the rare tier. Another 5 points would lift it into a rarer tier.

That score comes from 5 science badges — Confirmed exoplanet, Gas giant, Directly imaged, Orbits a red dwarf and Orbits beyond Neptune's distance — 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.