About HD 87646 b
HD 87646 b is a rare exoplanet. It lies about 240 light-years from Earth, has an equilibrium temperature near 1,013 K, spans roughly 12.4 Earth radii and weighs about 3,941.09 Earth masses.
Packed denser than solid iron.
Rare exoplanet 37 EP
HD 87646 b
RA 151.6695° · Dec 17.8950° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Denser than iron +18
- Hot Jupiter +10
- Confirmed exoplanet +5
- Gas giant +4
Total score 37
9 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Hot Jupiter · +10
- Denser than iron · +18
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. ≈ 4.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 374.7 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 2400 years in a starship at a tenth of light speed.
- Distance. 240 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1786.
Saying hello
- Say hello. A radio message and its reply would take 480 years round-trip.
Standing on it
- A year here. A full year lasts just 13.5 Earth days.
By the numbers
- Size. About 12.4× the width of Earth.
- Volume. About 1907 Earths could fit inside it.
- Mass. Roughly 3941× Earth's mass — about 12.4 Jupiters.
- Your weight. You'd weigh about 25.6× your Earth weight standing here.
- Density. Denser than solid iron.
- Temperature. Around 740°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Apache Point Observatory using the radial velocity method.
Properties
- density gcc
- 11.4
- discovery facility
- Apache Point Observatory
- discovery method
- Radial Velocity
- dist ly
- 239.9971
- eccentricity
- 0.05
- eq temp k
- 1012.7
- insolation
- 665.812
- mass earth
- 3941.092
- name
- HD 87646 b
- orbital period days
- 13.481
- radius earth
- 12.4
- sys num planets
- 1
How to see it
Like any astronomical target, HD 87646 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 HD 87646 b is a rare exoplanet
HD 87646 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, Hot Jupiter and Denser than iron — 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.