About HD 22946 d
HD 22946 d is a rare exoplanet. It lies about 204.8 light-years from Earth, has an equilibrium temperature near 546 K, spans roughly 2.61 Earth radii and weighs about 26.57 Earth masses.
Packed denser than solid iron.
Rare exoplanet 38 EP
HD 22946 d
RA 54.8195° · Dec -42.7630° · exoplanet
Score breakdown
· 5 badgesRare 46 pts → Epic
- Denser than iron +18
- Multi-planet system +6
- Confirmed exoplanet +5
- Sub-Neptune +5
- Found by TESS +4
Total score 38
8 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Sub-Neptune · +5
- Denser than iron · +18
- Multi-planet system · +6
- Found by TESS · +4
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. ≈ 3.6 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 319.7 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 2048 years in a starship at a tenth of light speed.
- Distance. 205 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1821.
Saying hello
- Say hello. A radio message and its reply would take 410 years round-trip.
Standing on it
- A year here. A full year lasts just 47.4 Earth days.
By the numbers
- Size. About 2.6× the width of Earth.
- Volume. About 17.7 Earths could fit inside it.
- Mass. About 26.6× the mass of Earth.
- Your weight. You'd weigh about 3.9× your Earth weight standing here.
- Density. Denser than solid iron.
- Temperature. A scorching 273°C on average.
How we found it
- Discovery. Found by Transiting Exoplanet Survey Satellite (TESS) using the transit method.
Cosmic context
- Crowded system. One of at least 3 planets orbiting its star.
Properties
- density gcc
- 10.8
- discovery facility
- Transiting Exoplanet Survey Satellite (TESS)
- discovery method
- Transit
- dist ly
- 204.7581
- eq temp k
- 546
- insolation
- 18.561
- mass earth
- 26.57
- name
- HD 22946 d
- orbital period days
- 47.4249
- radius earth
- 2.607
- sys num planets
- 3
How to see it
Like any astronomical target, HD 22946 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 HD 22946 d is a rare exoplanet
HD 22946 d scores 38 points on Spacedle's rarity scale, which places it in the rare tier. Another 8 points would lift it into a rarer tier.
That score comes from 5 science badges — Confirmed exoplanet, Sub-Neptune, Denser than iron, Multi-planet system and Found by TESS — 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.