The K2-72 System

4 planets 1 in habitable zone Aquarius

K2-72 is a planetary system in the constellation Aquarius hosting 4 confirmed exoplanets, about 217 light-years from Earth. One of its planets orbits within the habitable zone, where liquid water could exist on a planetary surface.

Size Comparison: The Planets of K2-72

Compare any two worlds side by side in the Exoplanet Explorer app ›

K2-72: Star and Habitable Zone

K2-72

Surface temperature: 3,360 K (Sun: 5,772 K)
Mass: 0.27 M☉
Radius: 0.33 R☉

K2-72 b K2-72 c K2-72 d K2-72 e

Too hot Optimistic habitable zone Conservative habitable zone Too cold

Habitable zone of K2-72: 0.092–0.240 AU (conservative: 0.116–0.227 AU), per Kopparapu et al. (2014). Earth orbits the Sun at 1 AU.

See the full interactive habitable-zone view in the Exoplanet Explorer app ›

All 4 Planets in the K2-72 System

Planet	Type	Orbit	Radius	ESI	Discovered
K2-72 b	Terrestrial	5.6 d	1.08 R⊕	0.43	2016
K2-72 c	Terrestrial	15 d	1.16 R⊕	0.70	2016
K2-72 d	Terrestrial	7.8 d	1.01 R⊕	0.50	2016
K2-72 e HZ	Super Earth	24 d	1.29 R⊕	0.87	2016

Discovery History

The first planet found here, K2-72 b, was discovered in 2016 using the transit method.

2016 — K2-72 b (Transit)
2016 — K2-72 c (Transit)
2016 — K2-72 d (Transit)
2016 — K2-72 e (Transit)

Frequently Asked Questions About K2-72

How many planets does K2-72 have?

K2-72 has 4 confirmed exoplanets. More may await discovery.

Are any planets in the K2-72 system habitable?

One planet in the system orbits within the habitable zone, where liquid water could exist. Actual habitability depends on atmospheres and composition, which are not yet known.

How far away is K2-72?

K2-72 is about 217 light-years from Earth in the constellation Aquarius.

Explore the K2-72 system in the app

Browse, filter and compare 6,000+ exoplanets on iPhone, iPad and Apple Watch — with habitable-zone views, widgets and offline data.