About SWEEPS-4 b
SWEEPS-4 b is a rare exoplanet. It lies about 27,723.3 light-years from Earth, spans roughly 9.08 Earth radii, weighs about 1,207.7 Earth masses and completes an orbit every 4.2 days.
Packed denser than solid iron.
Rare exoplanet 37 EP
SWEEPS-4 b
RA 269.7247° · Dec -29.1891° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Denser than iron +18
- Distant (>1000 ly) +10
- Confirmed exoplanet +5
- Gas giant +4
Total score 37
9 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Denser than iron · +18
- Distant (>1000 ly) · +10
Trivia
What makes it special
- Heavyweight. Packed denser than solid iron.
Could we get there?
- Verdict. Impossible with our current technology — and the next millennium of it.
Getting there
- Aboard Voyager 1. ≈ 487.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 43.3 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 277.2 thousand years in a starship at a tenth of light speed.
- Distance. 27.7 thousand light-years from Earth.
Look-back time
- Look-back time. This light set out before Homo sapiens existed.
Saying hello
- Say hello. A radio message and its reply would take 55.4 thousand years round-trip.
Standing on it
- A year here. A full year lasts just 4.2 Earth days.
By the numbers
- Size. About 9.1× the width of Earth.
- Volume. About 748 Earths could fit inside it.
- Mass. Roughly 1208× Earth's mass — about 3.8 Jupiters.
- Your weight. You'd weigh about 14.7× your Earth weight standing here.
- Density. Denser than solid iron.
How we found it
- Discovery. Found by Hubble Space Telescope using the transit method.
Properties
- density gcc
- 8.87
- discovery facility
- Hubble Space Telescope
- discovery method
- Transit
- dist ly
- 27723.26
- mass earth
- 1207.7
- name
- SWEEPS-4 b
- orbital period days
- 4.2
- radius earth
- 9.079
- sys num planets
- 1
How to see it
Like any astronomical target, SWEEPS-4 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 SWEEPS-4 b is a rare exoplanet
SWEEPS-4 b scores 37 points on Spacedle's rarity scale, which places it in the rare tier. Another 9 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Denser than iron and Distant (>1000 ly) — 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.