About HD 203030 b
HD 203030 b is a rare exoplanet. It lies about 128 light-years from Earth, has an equilibrium temperature near 1,040 K, spans roughly 14.46 Earth radii and weighs about 3,496.11 Earth masses.
About 14.5× the width of Earth.
Rare exoplanet 35 EP
HD 203030 b
RA 319.7432° · Dec 26.2306° · exoplanet
Score breakdown
· 4 badgesRare 46 pts → Epic
- Directly imaged +16
- Hot Jupiter +10
- Confirmed exoplanet +5
- Gas giant +4
Total score 35
11 more points to reach Epic.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Hot Jupiter · +10
- Directly imaged · +16
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 2.2 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 199.9 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 1280 years in a starship at a tenth of light speed.
- Distance. 128 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1898.
Saying hello
- Say hello. A radio message and its reply would take 256 years round-trip.
By the numbers
- Size. About 14.5× the width of Earth.
- Volume. About 3023 Earths could fit inside it.
- Mass. Roughly 3496× Earth's mass — about 11 Jupiters.
- Your weight. You'd weigh about 16.7× your Earth weight standing here.
- Temperature. Around 767°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by Palomar Observatory using the imaging method.
Properties
- density gcc
- 6.35
- discovery facility
- Palomar Observatory
- discovery method
- Imaging
- dist ly
- 128.0172
- eq temp k
- 1040
- insolation
- 0
- mass earth
- 3496.1125
- name
- HD 203030 b
- radius earth
- 14.4596
- sys num planets
- 1
How to see it
Like any astronomical target, HD 203030 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 203030 b is a rare exoplanet
HD 203030 b scores 35 points on Spacedle's rarity scale, which places it in the rare tier. Another 11 points would lift it into a rarer tier.
That score comes from 4 science badges — Confirmed exoplanet, Gas giant, Hot Jupiter and Directly imaged — 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.