About HIP 29442 d
HIP 29442 d is a rare exoplanet. It lies about 222.4 light-years from Earth, has an equilibrium temperature near 920 K, spans roughly 1.54 Earth radii and weighs about 5.14 Earth masses.
Packed denser than solid iron.
Rare exoplanet 37 EP
HIP 29442 d
RA 93.0578° · Dec -14.6493° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Denser than iron +18
- Super-Earth +8
- Multi-planet system +6
- Confirmed exoplanet +5
Total score 37
9 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Super-Earth · +8
- Denser than iron · +18
- Multi-planet system · +6
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. ≈ 3.9 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 347.3 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 2224 years in a starship at a tenth of light speed.
- Distance. 222 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1804.
Saying hello
- Say hello. A radio message and its reply would take 445 years round-trip.
Standing on it
- A year here. A full year lasts just 6.4 Earth days.
By the numbers
- Size. About 1.5× the width of Earth.
- Mass. About 5.1× the mass of Earth.
- Your weight. You'd weigh about 2.2× your Earth weight standing here.
- Density. Denser than solid iron.
- Temperature. Around 647°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Paranal Observatory using the radial velocity method.
Cosmic context
- Crowded system. One of at least 3 planets orbiting its star.
Properties
- density gcc
- 11
- discovery facility
- Paranal Observatory
- discovery method
- Radial Velocity
- dist ly
- 222.4123
- eq temp k
- 920
- insolation
- 203
- mass earth
- 5.14
- name
- HIP 29442 d
- orbital period days
- 6.4296
- radius earth
- 1.538
- sys num planets
- 3
How to see it
Like any astronomical target, HIP 29442 d 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 HIP 29442 d is a rare exoplanet
HIP 29442 d 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, Super-Earth, Denser than iron and Multi-planet system — 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.