Name a planet

There’s a planet orbiting a distant star and

it’s waiting for someone in New Zealand to give it a new name.


Make a submissionFAQs

In celebration of 100 years of the International Astronomical Union, the IAU NameExoWorld global competition allows any country in the world to give a popular name to a selected exoplanet and its host star.

New Zealand has been assigned the planet HD 137388b and its host star HD 137388 and we need your help in choosing names! 

You can make a submission here between 1 September 2019 and 30 September 2019 (5:00 p.m. NZST).

A panel of judges will select the name of the star and the planet by 30 October 2019 and will make its submission to the IAU by the 31 October 2019. IAU will make it’s final announcement in by 31 December 2019. The winner will then be notified via email.

Please note that entries can only be accepted from people living in NZ during the time of the submission.

Learn more and make a submission below.

Questions? Contact us


Suggest a name

Please see the official naming rules for the full details, but here are the main do’s and don’ts for naming HD 137388b and its star.


  • Suggest two names, one for the planet and one for its star.
  • Use either English or Te Reo.
  • Choose things, people, or places of long-standing cultural, historical, or geographical significance, worthy of being assigned to a celestial object.
  • Choose names for the star and the planet which follow a common naming theme.
  • Make sure any other objects in the exoplanetary system can be named using this naming theme.
  • Provide a brief explanation (maximal 200 words) why you chose your names.


  • Use names which are offensive.
  • Suggest names of individuals, places or events principally known for political, military or religious activities.

You can make your submission here between 1/09/2019 and 30/09/2019 5:00pm NZST. 

The winner will be notified via email.

Entries can only be accepted from people living in NZ during the time of the submission.

Your submission should include:

  • Your name, age range and contact email
  • Your suggested names for the star and the planet
  • A maximum 200 word statement on your reason for choosing those name


This competition is now closed

Credit: ESO

The planet HD 137388b is in a system with an orange dwarf star in the constellation Apus identified as HD 137388, and is 132 light years from Earth.

According to NASA, exoplanet HD 137388 b is a gas giant, with a mass of 0.2 Jupiters. It takes 330 days to complete one orbit of its star, and is 0.89 astronomical units (the average distance between Earth and our Sun) from its star. Its discovery was announced in 2011.

HD 137388 b was found with the European High Accuracy Radial Velocity Planet Searcher (HARPS), at the European Southern Observatory La Silla 3.6m telescope (pictured), which is dedicated to the discovery of extrasolar planets

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