About HD 158259 c
HD 158259 c is an uncommon exoplanet. It lies about 88.2 light-years from Earth, spans roughly 2.23 Earth radii, weighs about 5.6 Earth masses and completes an orbit every 3.43 days.
Crammed into a system of five or more planets.
Uncommon exoplanet 30 EP
HD 158259 c
RA 261.3496° · Dec 52.7905° · exoplanet
Score breakdown
· 4 badgesUncommon 33 pts → Rare
- Richly packed system +14
- Multi-planet system +6
- Confirmed exoplanet +5
- Sub-Neptune +5
Total score 30
3 more points to reach Rare.
Badges
- Confirmed exoplanet · +5
- Sub-Neptune · +5
- Multi-planet system · +6
- Richly packed system · +14
Trivia
What makes it special
- Packed system. Crammed into a system of five or more planets.
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 1.6 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 137.8 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 882 years in a starship at a tenth of light speed.
- Distance. 88.2 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1938.
Saying hello
- Say hello. A radio message and its reply would take 176 years round-trip.
Standing on it
- A year here. A full year lasts just 3.4 Earth days.
By the numbers
- Size. About 2.2× the width of Earth.
- Volume. About 11.1 Earths could fit inside it.
- Mass. About 5.6× the mass of Earth.
- Your weight. You'd weigh about 1.1× your Earth weight standing here.
How we found it
- Discovery. Found by Haute-Provence Observatory using the radial velocity method.
Cosmic context
- Crowded system. One of at least 5 planets orbiting its star.
Properties
- density gcc
- 2.77
- discovery facility
- Haute-Provence Observatory
- discovery method
- Radial Velocity
- dist ly
- 88.2245
- mass earth
- 5.6
- name
- HD 158259 c
- orbital period days
- 3.432
- radius earth
- 2.23
- sys num planets
- 5
How to see it
Like any astronomical target, HD 158259 c 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 158259 c is an uncommon exoplanet
HD 158259 c scores 30 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 3 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Sub-Neptune, Multi-planet system and Richly packed 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.