About CHXR 73 b
CHXR 73 b is a rare exoplanet. It lies about 620.9 light-years from Earth, spans roughly 12.3 Earth radii, weighs about 3,994.49 Earth masses and belongs to a system of 1 known planets.
Packed denser than solid iron.
Rare exoplanet 43 EP
CHXR 73 b
RA 166.6194° · Dec -77.6259° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Denser than iron +18
- Directly imaged +16
- Confirmed exoplanet +5
- Gas giant +4
Total score 43
3 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Denser than iron · +18
- Directly imaged · +16
Trivia
What makes it special
- Heavyweight. Packed denser than solid iron.
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.
- At 10% light speed. ≈ 6209 years in a starship at a tenth of light speed.
- Distance. 621 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1405.
Saying hello
- Say hello. A radio message and its reply would take 1242 years round-trip.
By the numbers
- Size. About 12.3× the width of Earth.
- Volume. About 1861 Earths could fit inside it.
- Mass. Roughly 3994× Earth's mass — about 12.6 Jupiters.
- Your weight. You'd weigh about 26.4× your Earth weight standing here.
- Density. Denser than solid iron.
How we found it
- Discovery. Found by Hubble Space Telescope using the imaging method.
Properties
- density gcc
- 11.8
- discovery facility
- Hubble Space Telescope
- discovery method
- Imaging
- dist ly
- 620.9162
- mass earth
- 3994.486
- name
- CHXR 73 b
- radius earth
- 12.3
- sys num planets
- 1
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 43 points on Spacedle's rarity scale, which places it in the rare tier. Another 3 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Denser than iron and Directly imaged — 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.