51 Pegasi

Artist impression by ESO/L. Calçada

51 Pegasi

Star details
  • Constellation: the Winged Horse
  • Vmag: 5.5
  • Visibility: Visible to the naked eye
  • Number of Planets: 1

Planet details

51 Pegasi b

  • Mass (Jupiters): 0.47
  • Mass (Earths): 148.7
  • Period (days): 4.23
  • Semi Major Axis (AU): 0.052

Proposed names

Star name / planet name Proposed names
51 Pegasi Apollonis
Our proposed names honor the human exploration of worlds beyond the Earth, referencing the Apollo program. We choose to name the ExoWorld 51 Pegasi because it contains the first exoplanet discovered around a Sun-like star and is therefore the exoplanet-discovery counterpart to the first instance of a human traveling to a world beyond our own. As a member of “the Winged Horse” constellation, there is additional synergy between 51 Peg and the Apollo program, which NASA manager Silverstein named as such because “Apollo riding his chariot across the Sun was appropriate to the grand scale of the proposed program” (7.13.1969 Apollo 11 Press Release 69-36).

Apollonis is a Muse and one of the daughters of Apollo in Greek mythology. We choose this name because it helps to honor the many women that have contributed to the human space exploration and exoplanet discovery endeavors, even though their names are often less well known.

Neil is in reference to Neil Armstrong, the first person to walk on the Moon. We choose to use Armstrong’s given name over his surname in analogy to the way that the scientific designation for exoplanets uses a lower case letter instead of capital one (51 Peg b), suggesting a level of informality or familiarity.
51 Pegasi b Neil
Our proposed names honor the human exploration of worlds beyond the Earth, referencing the Apollo program. We choose to name the ExoWorld 51 Pegasi because it contains the first exoplanet discovered around a Sun-like star and is therefore the exoplanet-discovery counterpart to the first instance of a human traveling to a world beyond our own. As a member of “the Winged Horse” constellation, there is additional synergy between 51 Peg and the Apollo program, which NASA manager Silverstein named as such because “Apollo riding his chariot across the Sun was appropriate to the grand scale of the proposed program” (7.13.1969 Apollo 11 Press Release 69-36).

Apollonis is a Muse and one of the daughters of Apollo in Greek mythology. We choose this name because it helps to honor the many women that have contributed to the human space exploration and exoplanet discovery endeavors, even though their names are often less well known.

Neil is in reference to Neil Armstrong, the first person to walk on the Moon. We choose to use Armstrong’s given name over his surname in analogy to the way that the scientific designation for exoplanets uses a lower case letter instead of capital one (51 Peg b), suggesting a level of informality or familiarity.
Star name / planet name Proposed names
51 Pegasi Carousel
The Planet carousel orbits 51 Pegasi relatively fast, so that the planet looks like a carousel. To avoid confusion the Sun should have also a similar name like the planet.
51 Pegasi b Carousel Hell b
The Planet orbits 51 pegasi fast, that the planet looks like a carousel. And the planet is very near at the host sun (0.052AU), so that it has a bounded rotation and must have a really hellish environment.
Star name / planet name Proposed names
51 Pegasi Jiguang
Jiguang "吉光" is the name of legendary horse appears in Chinese mythology that is a symbol of good luck . Since Jiguang is a very rare animal , so the Chinese idiom use "A piece of feather from Jiguang" "吉光片羽" to describe some extremely rare documents or artifacts.
51 Pegasi b Matafeiyan
Matafeiyan "馬踏飛燕" is the famous Han Dynasty bronze statue of a lifelike horse in Gansu Provincial Museum, China. As the exoplanet orbits the host star in around 4days, the relatively high revolution speed is just like Matafeiyan - a galloping horse which looks like a swallow flying in the air.
Star name / planet name Proposed names
51 Pegasi Umisachi
“Umisachi” is called “Umisachihiko” for short.
A god of Japanese ancient myth, who created resources obtained from sea.
51 Pegasi b Yamasachi
“Yamasachi” is called “Yamasachihiko” for short.
“Yamasachi” created resources obtained from mountain.
“Yamasachi” is “Umisachi” 's younger brother.

We wish the human race to be going to leap to space further in the future, therefor we want to give the name of the god who is Japanese ancient myth written in “Kojiki”(the oldest tale of Japan) or “Nihon-Shoki”(the chronicles of Japan) to the 51st star of Winged Horse as flying horse Pegasus.
Japanese folk tale “Urashima Tarou” is based on this “Umisachi” story, Japanese people are widely familiar with this folk tale “Urashima Tarou”.

Star name / planet name Proposed names
51 Pegasi Starry Bunnies
Remarks about your submission
Like a bunny and a tortoise.
51 Pegasi b Tortoise
Remarks about your submission
Like a bunny and a tortoise.
Star name / planet name Proposed names
51 Pegasi Mondufemom
Mondufemom is the second name elected by children attending the French Kids Astronomy Festival during Summer 2014 (the first goes to the name of exoplanet).
51 Pegasi b Prantriguse
Prantriguse is a name elected by the 200 children involved in the French Kids Astronomy Festival during Summer 2014. Dozens of name have been submitted, and "Prantriguse" has been proposed by a 8-years old guy, named Imanol. "It means nothing but because exoplanets are new worlds, we have to invent new words !" he justified. To defend their choice, children asked, Leopold Eyharts, one of the European astronauts, to take a picture with them and the name they proposed.

Children that participated to the choice of the exoplanet name are aged from 4 to 16 years old. All the propositions have been done by the youngest children aged from 4 to 8 years old.
The French Kids Astronomy Festival takes place every year at Fleurance during the first half of August and welcome about 200 children each day.

Star name / planet name Proposed names
51 Pegasi 51 Pegasi
Same name as it is well known as 51 Pegasi.
51 Pegasi b Epicurus
Epicurus was proposed by Michel Mayor to our society from the Epicurian plurality of world’s theory. He discovered 51 Pegasi b along with Didier Queloz. Michel Mayor became the honorary President of our society, the "Société Astronomique de Genève" on the 17th April 2015. More info:
http://www.astro-ge.net/?p=1997
Star name / planet name Proposed names
51 Pegasi Chrysaor
It's because Chrysaor as well as Pegasus was born out of Medusa's blood at the time she was killed by Perseus.
51 Pegasi b Hydrogen
Because this was discovered as the first extra-solar planet around the stars, and hydrogen is known for its chemical element of the atomic number 1. We named it as "hydrogen" because there's a common factor in that they both can be characterized as 'being the first'.
Star name / planet name Proposed names
51 Pegasi Carl
As Carl Sagan has played a great role in the lives of countless space enthusiasts, it is time to name a star after him. He died in 1996, the year after the discovery of 51 Pegasi b, so he indeed experienced this discovery and contemplated the implications.
51 Pegasi b Dot
Carl Sagan famously called our planet "The Pale Blue Dot". This planet is yet another such dot in the Universe. To name this planet after his phrase is to honor a fantastic human being who gave so much to so many.

Our association, Astronomisk Ungdom, supports this name-suggestion. It was submitted by one of our members, Mikael Lidström, in a national competition of ours.

Star name / planet name Proposed names
51 Pegasi Helvetios
Helvetios is a word of Latin origin and essentially means “the Helvetian”. Because the term is derived from the Latin it is easy to pronounce in many languages. The Helvetians were a Celtic tribe and lived north of the Alps in the territory of present Switzerland. Due to the fact that the exosystem was discovered by Swiss citizens and we want to name it Helvetios (Swiss), we believe that the name fits in a dual way.
51 Pegasi b Dimidium
For the name of the planet we decided to choose “Dimidium”.
We selected it because the Planet has almost exactly the half of the mass of Jupiter. Dimidium is the Latin word for “the half” and also here it is easy to pronounce in different languages. Apart from the fact that the planet has the half of the Jupiter mass, it represents also the half of the system. Not in volume but quantitatively. Dividium is in our opinion in both of these aspects a very appropriate name.
Star name / planet name Proposed names
51 Pegasi pegasusfeather
“Pegasusfeather” was thought out by 7-8 years old children. This star locates near Pegasus constellation. “Pegasusfeather” expresses aspect the spread feathers from Pegasus.
51 Pegasi b soryolen
Soryolen is new word created by three children at age of 5-7 years old. “Soryolen”was originated from combination of three children’s names. “So” means “playing the sounds”. “Ryo” means “coolness”. “Len” means “lotus”. Therefore “soryolen” may mean “playing the sounds of cool lotus”