About HD 240210 b
HD 240210 b is a common exoplanet. It lies about 1,214.6 light-years from Earth, has an equilibrium temperature near 971 K, spans roughly 12.8 Earth radii and weighs about 1,655.82 Earth masses.
About 12.8× the width of Earth.
Common exoplanet 19 EP
HD 240210 b
RA 347.6219° · Dec 57.0295° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Distant (>1000 ly) +10
- Confirmed exoplanet +5
- Gas giant +4
Total score 19
5 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Distant (>1000 ly) · +10
Trivia
Could we get there?
- Verdict. Impossible with our current technology — and the next millennium of it.
Getting there
- Aboard Voyager 1. ≈ 21.3 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 1.9 million years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 12.1 thousand years in a starship at a tenth of light speed.
- Distance. 1215 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 811.
Saying hello
- Say hello. A radio message and its reply would take 2429 years round-trip.
Standing on it
- A year here. A full year lasts just 502 Earth days.
By the numbers
- Size. About 12.8× the width of Earth.
- Volume. About 2097 Earths could fit inside it.
- Mass. Roughly 1656× Earth's mass — about 5.2 Jupiters.
- Your weight. You'd weigh about 10.1× your Earth weight standing here.
- Temperature. Around 698°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by McDonald Observatory using the radial velocity method.
Properties
- density gcc
- 4.34
- discovery facility
- McDonald Observatory
- discovery method
- Radial Velocity
- dist ly
- 1214.6213
- eccentricity
- 0.15
- eq temp k
- 970.67
- insolation
- 26.3684
- mass earth
- 1655.82
- name
- HD 240210 b
- orbital period days
- 501.75
- radius earth
- 12.8
- sys num planets
- 1
How to see it
Like any astronomical target, HD 240210 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 240210 b is a common exoplanet
HD 240210 b scores 19 points on Spacedle's rarity scale, which places it in the common tier. Another 5 points would lift it into a rarer tier.
That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Distant (>1000 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.