About HAT-P-3 b
HAT-P-3 b is a common exoplanet. It lies about 438.9 light-years from Earth, has an equilibrium temperature near 1,189 K, spans roughly 10.54 Earth radii and weighs about 206.59 Earth masses.
About 10.5× the width of Earth.
Common exoplanet 19 EP
HAT-P-3 b
RA 206.0940° · Dec 48.0286° · exoplanet
Score breakdown
· 3 badgesCommon 24 pts → Uncommon
- Hot Jupiter +10
- Confirmed exoplanet +5
- Gas giant +4
Total score 19
5 more points to reach Uncommon.
Badges
- Confirmed exoplanet · +5
- Gas giant · +4
- Hot Jupiter · +10
Trivia
Could we get there?
- Verdict. Hopelessly far for any craft humanity can build today.
Getting there
- Aboard Voyager 1. ≈ 7.7 million years at Voyager 1's speed (17 km/s).
- Fastest probe ever. ≈ 685.2 thousand years even at the Parker Solar Probe's 192 km/s.
- At 10% light speed. ≈ 4389 years in a starship at a tenth of light speed.
- Distance. 439 light-years from Earth.
Look-back time
- Look-back time. The light you'd see left around the year 1587.
Saying hello
- Say hello. A radio message and its reply would take 878 years round-trip.
Standing on it
- A year here. A full year lasts just 2.9 Earth days.
By the numbers
- Size. About 10.5× the width of Earth.
- Volume. About 1170 Earths could fit inside it.
- Mass. Roughly 207× Earth's mass — about 0.7 Jupiters.
- Your weight. You'd weigh about 1.9× your Earth weight standing here.
- Density. Less dense than water — drop it in a big enough ocean and it would float.
- Temperature. Around 916°C — hotter than a self-cleaning oven.
How we found it
- Discovery. Found by HATNet using the transit method.
Properties
- density gcc
- 0.855
- discovery facility
- HATNet
- discovery method
- Transit
- dist ly
- 438.8559
- eccentricity
- 0
- eq temp k
- 1189
- insolation
- 176.587
- mass earth
- 206.5895
- name
- HAT-P-3 b
- orbital period days
- 2.8997
- radius earth
- 10.5365
- sys num planets
- 1
How to see it
Like any astronomical target, HAT-P-3 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 HAT-P-3 b is a common exoplanet
HAT-P-3 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 Hot Jupiter — 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.