About HD 180617 b
HD 180617 b is a common exoplanet. It lies about 19.3 light-years from Earth, has an equilibrium temperature near 202 K, spans roughly 3.53 Earth radii and weighs about 12.21 Earth masses.
About 3.5× the width of Earth.
Common exoplanet 22 EP
HD 180617 b
RA 289.2277° · Dec 5.1632° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Nearby (<25 ly) +12
- Confirmed exoplanet +5
- Sub-Neptune +5
Total score 22
2 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Sub-Neptune · +5
- Nearby (<25 ly) · +12
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 338.8 thousand years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 30.1 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 193 years in a starship at a tenth of light speed.
- Distance. 19.3 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 2007.
Saying hello
- Say hello. A radio message and its reply would take 38.6 years round-trip.
Standing on it
- A year here. A full year lasts just 106 Earth days.
By the numbers
- Size. About 3.5× the width of Earth.
- Volume. About 44 Earths could fit inside it.
- Mass. About 12.2× the mass of Earth.
- Your weight. You'd weigh about 1.0× your Earth weight standing here.
- Temperature. A frigid -71°C — colder than dry ice.
How we found it
- Discovery. Found by Calar Alto Observatory using the radial velocity method.
Properties
- density gcc
- 1.53
- discovery facility
- Calar Alto Observatory
- discovery method
- Radial Velocity
- dist ly
- 19.2777
- eccentricity
- 0.101
- eq temp k
- 201.8
- insolation
- 0.2751
- mass earth
- 12.214
- name
- HD 180617 b
- orbital period days
- 105.911
- radius earth
- 3.53
- sys num planets
- 1
How to see it
Like any astronomical target, HD 180617 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 180617 b is a common exoplanet
HD 180617 b scores 22 points on Spacedle's rarity scale, which places it in the common tier. Another 2 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Sub-Neptune and Nearby (<25 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.