Common exoplanet 15 EP

HAT-P-17 b

RA 324.5360° · Dec 30.4882° · exoplanet

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Score breakdown

· 3 badges

15 pts · Common

Common 24 pts → Uncommon

Multi-planet system +6
Confirmed exoplanet +5
Gas giant +4

Total score 15

9 more points to reach Uncommon.

Badges

Confirmed exoplanet · +5
Gas giant · +4
Multi-planet system · +6

Trivia

Could we get there?

Verdict. Hopelessly far for any craft humanity can build today.

Getting there

Aboard Voyager 1. ≈ 5.3 million years at Voyager 1's speed (17 km/s).
Fastest probe ever. ≈ 470.5 thousand years even at the Parker Solar Probe's 192 km/s.
At 10% light speed. ≈ 3013 years in a starship at a tenth of light speed.
Distance. 301 light-years from Earth.

Look-back time

Look-back time. The light you'd see left around the year 1725.

Saying hello

Say hello. A radio message and its reply would take 603 years round-trip.

Standing on it

A year here. A full year lasts just 10.3 Earth days.

By the numbers

Size. About 11.8× the width of Earth.
Volume. About 1630 Earths could fit inside it.
Mass. Roughly 184× Earth's mass — about 0.6 Jupiters.
Your weight. You'd weigh about 1.3× your Earth weight standing here.
Density. Less dense than water — drop it in a big enough ocean and it would float.
Temperature. Around 527°C — hotter than a self-cleaning oven.

How we found it

Discovery. Found by HATNet using the transit method.

Cosmic context

Crowded system. One of at least 2 planets orbiting its star.

Properties

density gcc: 0.44
discovery facility: HATNet
discovery method: Transit
dist ly: 301.313
eccentricity: 0.35
eq temp k: 800
insolation: 110.512
mass earth: 184.3414
name: HAT-P-17 b
orbital period days: 10.3385
radius earth: 11.7695
sys num planets: 2

About HAT-P-17 b

HAT-P-17 b is a common exoplanet. It lies about 301.3 light-years from Earth, has an equilibrium temperature near 800 K, spans roughly 11.77 Earth radii and weighs about 184.34 Earth masses.

One of at least 2 planets orbiting its star.

How to see it

Like any astronomical target, HAT-P-17 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-17 b is a common exoplanet

HAT-P-17 b scores 15 points on Spacedle's rarity scale, which places it in the common tier. Another 9 points would lift it into a rarer tier.

That score comes from 3 science badges — Confirmed exoplanet, Gas giant and Multi-planet system — 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.