About HD 220773 b
HD 220773 b is an uncommon exoplanet. It lies about 164.7 light-years from Earth, has an equilibrium temperature near 167 K, spans roughly 13.6 Earth radii and weighs about 460.8 Earth masses.
About 13.6× the width of Earth.
Uncommon exoplanet 28 EP
HD 220773 b
RA 351.6145° · Dec 8.6429° · exoplanet
Score breakdown
· 4 badgesUncommon 33 pts → Rare
- Long-period world +10
- Eccentric orbit +9
- Confirmed exoplanet +5
- Gas giant +4
Total score 28
5 more points to reach Rare.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Long-period world · +10
- Eccentric orbit · +9
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 2.9 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 257.2 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 1647 years in a starship at a tenth of light speed.
- Distance. 165 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1861.
Saying hello
- Say hello. A radio message and its reply would take 329 years round-trip.
Standing on it
- A year here. A full year lasts about 10.2 Earth years.
By the numbers
- Size. About 13.6× the width of Earth.
- Volume. About 2515 Earths could fit inside it.
- Mass. Roughly 461× Earth's mass — about 1.4 Jupiters.
- Your weight. You'd weigh about 2.5× your Earth weight standing here.
- Temperature. A frigid -106°C — colder than dry ice.
How we found it
- Discovery. Found by McDonald Observatory using the radial velocity method.
Properties
- density gcc
- 1.01
- discovery facility
- McDonald Observatory
- discovery method
- Radial Velocity
- dist ly
- 164.7424
- eccentricity
- 0.51
- eq temp k
- 167.02
- insolation
- 0.129
- mass earth
- 460.8
- name
- HD 220773 b
- orbital period days
- 3724.7
- radius earth
- 13.6
- sys num planets
- 1
How to see it
Like any astronomical target, HD 220773 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 220773 b is an uncommon exoplanet
HD 220773 b scores 28 points on Spacedle's rarity scale, which places it in the uncommon tier. Another 5 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Long-period world and Eccentric orbit — 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.