47 Ursae Majoris

Artist impression by ESO/L. Calçada

47 Ursae Majoris

Star details
  • Constellation: the Great Bear
  • Vmag: 5.1
  • Visibility: Visible to the naked eye
  • Number of Planets: 2

Planet details

47 Ursae Majoris b

  • Mass (Jupiters): 2.53
  • Mass (Earths): 804.1
  • Period (days): 1078
  • Semi Major Axis (AU): 2.1

47 Ursae Majoris c

  • Mass (Jupiters): 0.54
  • Mass (Earths): 171.6
  • Period (days): 2391
  • Semi Major Axis (AU): 3.6

Proposed names

Star name / planet name Proposed names
47 Ursae Majoris Midgard
Midgard is the name for the world inhabited by and known to humans in early Germanic cosmology, and specifically one of the Nine Worlds in Norse mythology.
47 Ursae Majoris b Ronin
A rōnin was a samurai with no lord or master during the feudal period (1185–1868) of Japan. A samurai became masterless from the death or fall of his master, or after the loss of his master's favor or privilege.
47 Ursae Majoris c Guimar
It is also the location of the Barranco de Badajoz and one of the possible locations for Atlantis. A portion of its volcanic landscape has been set aside as the Reserva Natural del Malpaís de Güímar, its highest point being Montaña Grande.
Star name / planet name Proposed names
47 Ursae Majoris Albion
The oldest term attributed to the island of Great Britain, but invoked by poets and writers to refer to a more general notion of far-away lands and “the world above”, and tied to notions of exploration and new encounters.
47 Ursae Majoris b Paramour
A Royal Navy ship commanded by the astronomer Edmund Halley. He sailed the Atlantic on several expeditions in his 40s, making magnetic observations to measure the discrepancy between magnetic and true north. Halley conducted extensive scientific observations from the Paramour, and in 1699 took her to St. Helena, where he had lived for a year over two decades earlier. During that time, at the age of 20, he made his chart of the Southern Stars.
47 Ursae Majoris c Endeavour
The vessel commanded by James Cook on his first voyage of discovery. Cook and his fellow astronomer Green observed the 1769 transit of Venus from the recently discovered Tahiti – an event predicted in detail by the late Edmund Halley. These observations provided valuable scientific information about the scale of the Solar System. Endeavour has a long association with astronomical exploration, the name carried by both an Apollo command module and the now-retired Space Shuttle.

At the Royal Observatory Greenwich , we chose names that touched upon the history of Britain and its long legacy of scientific achievements, while remaining separate from specific institutions or even Great Britain as a nation (as tempting as it was to go for something solely based of the works of the Royal Astronomers here at Greenwich!). We wanted to evoke the theme of “seeking knowledge”; tying a historic legacy of scientific investigation to extrasolar planets- a new frontier of discovery.

Finally, we feel that the names reward the interested stargazer. Pleasant and simple enough on first hearing, but with enough of a heritage as to reward further investigation.

Star name / planet name Proposed names
47 Ursae Majoris Takamaga
TAKAMAGA(TAKAMAGAHARA) is an old name for heaven in Japanese.
47 Ursae Majoris b Mahoroba
MAHOROBA is an old name for Japan in Japanese.
47 Ursae Majoris c Ashihara
ASHIHARA(TOYOASHIHARA) is an another old name for Japan in Japanese.

We'd like to propose a Japanese old names as the name to this planetary system. Of course, Japan is the country where we live. The country was green overcame, and was called an abundant and fertile country (TOYOASHIHARA). The gods which live in TAKAMAGAHARA are coming down to the ground in the national bearing myth, and it's said that they created Japan. Japan was also called "MAHOROBA" as "the country I'd like the living ".

Star name / planet name Proposed names
47 Ursae Majoris GHAZALA
In Western culture, the stars of the Big Dipper and those around it form the great bear, Ursa Major. The Dipper forms its body and tail, while three faint pairs of stars represent its feet.

In ancient Arabia (Middle Ages), before the Arabs adopted the Greek Astronomical figures for the constellations, they had different configurations in the sky, a lot of of starnames comes to us from this tradition, and those pairs of stars represented for them the springs or the leaps of a gazelle, and they’re named accordingly.
The first pair is known as Alula Borealis and Alula Australis — the northern and southern halves of the first leap.
The second pair is Tania Borealis and Australis — the second leap.
And the third pair is known by the name of its brighter star, Talitha — the third leap.
Location of 47 Ursae Majoris star (visible with naked eyes with a dark sky): is between the first and the second leap of the Gazelle.

In respect of the the arab tradition, our naming proposal for star 47 Ursae Majoris is : GHAZALA (Arabic name of Gazelle)
Ghazala is also the Swahili name of Gazelle.
47 Ursae Majoris b GHAZALEG
for its biggest planet with the celtic suffix EG (big)
47 Ursae Majoris c GHAZALIG
For the smallest planet with the celtic suffix IG (small)
Star name / planet name Proposed names
47 Ursae Majoris HERSCHEL
Herschel family contributed significantly fo the development of astronomy.
47 Ursae Majoris b WILLIAM
William Herschel discovered Uranus, built a telescope with f=12m and D= 1.26m, and made extensive catalogue of double stars.
47 Ursae Majoris c JOHN
John Herschel developed photography techniques in continued work of his father. He discovered several moons of Jupiter and Uranus and complemented catalogue of double stars.
Star name / planet name Proposed names
47 Ursae Majoris Kame
Kame is "tortoise" in Japanese. Kame is one of the most popular animals and the symbol of long life and good luck in Japan. A star is a symbol of long life. We named after it with a wish to shine forever.
47 Ursae Majoris b Turu
Turu is "crane" in Japanese. Turu is also a symbol of long life and good luck in Japan. The planet b is larger than the planet c, and the revolution around the primary star conjures up the image of "fly".
47 Ursae Majoris c Koi
Koi is "carp" in Japanese. Koi is also a symbol of long life and good luck in Japan. The planet c is smaller than the planet b, and the revolution around the primary star conjures up the image of swim in the pond of the sky.
Star name / planet name Proposed names
47 Ursae Majoris Baal
The phoenician father of gods. Since the star is older than the sun, we choose the phoenician mythology to give a fast idea of the star' s age.
47 Ursae Majoris b Tanit
She was, as well as a consort of Baal Hammon, a heavenly goddess of war, a virginal (not married) mother goddess and nurse, and, less specifically, a symbol of fertility, as are most female forms.
47 Ursae Majoris c Melkart
King of the Underworld and Cycle of Vegetation

The main idea is to reflect on the proposed names the age of the planets, taking into account the reference of the solar system planets and greek mythology.

Star name / planet name Proposed names
47 Ursae Majoris Virvatuli
Virvatuli means marsh light in Finnish thus being a suitable name for a distant, dim light calling us towards it. Maybe we might find a treasure there...
47 Ursae Majoris b Terrakoti
The name "Terrakoti" is a combination of "terra", earth as one might recognize, and "koti", meaning home in Finnish. The name derives from Metsätähti, a series of science fiction short stories by author and scholar in Comparative Literature, Markku Soikkeli. Terrakoti also happens to be the name of a club house of several SF associations in Turku. Since the star is visible from our location, we could host stargazing nights and see the world, perhaps carrying the name we proposed.

Although the planet itself has no solid surface, perhaps it's orbited by moons which some of our descendants may one day call "home".
47 Ursae Majoris c Lintukoto
In ancient Finnish mythology, Lintukoto was a warm region where the birds travelled for the winter along the "Linnunrata" (Birds' Path), that is, our Milky Way. Nowadays, the word means more of a peaceful, paradise-like place. More on Finnish mythology: https://en.wikipedia.org/wiki/Finnish_mythology#The_origins_and_the_structure_of_the_world

It would be wonderful if more Finnish language would appear on the night sky. It would especially do honour to the famous astronomer Yrjö Väisälä (https://en.wikipedia.org/wiki/Yrj%C3%B6_V%C3%A4is%C3%A4l%C3%A4) who worked here at the University of Turku and for example found and named several asteroids.

Star name / planet name Proposed names
47 Ursae Majoris TOKIWA
"TOKIWA" is the name of the beautiful park in Ube City at west Japan,and also, TOKIWA means "Our Ground is Forever".
47 Ursae Majoris b SACHI
"SACHI" represents the happiness in Japanese.
47 Ursae Majoris c EGAO
"EGAO" is Japanese. It represents a smile or a smiling face.
Star name / planet name Proposed names
47 Ursae Majoris Atsuta
The place of Shirotori legend. Shirotori legend is a tale of love in Japanese mythology (namely, Nihonshoki). "Atsu" means "hot" in Japanese.
47 Ursae Majoris b Miyasuhime
The wife of Yamatotakeru. She enshrined Yamatotakeru's sword (namely, Kusanagi-no-tsurugi) in Atsuta shrine after his death.
47 Ursae Majoris c Shirotori
The posthumous form of Yamatotakeru. Yamatotakeru is a hero in Japanese mythology. Legend has it that after his death he changes into Shirotori (white bird) to have a reunion with his wife Miyasuhime.
Star name / planet name Proposed names
47 Ursae Majoris Onyx
The onyx is one of the famous power stones.Because this name symbolizes "faith without the hesitation",it is naming that I expect that I bundle up two planets and build stable planetary system.
47 Ursae Majoris b Muspellzheimr
Muspellzheimr means the scorching country in theworld south end by ancient Norse word.I think that it is the name to excite our interest as an unknown planet.
47 Ursae Majoris c Roki
Roki is "mischievous God" in the north European myth. The behavior of
this small planet of the mass feels like resembling a person to move about quickly in the world of we earthian who there is what kind of mischief every day,or does not know it.

We can see Ursa Major from our place in all seasons.If there is the name that ourself suggested to this star,
we will remember this planetary system whenever we look up at the nighat sky.

Star name / planet name Proposed names
47 Ursae Majoris Chalawan
The asterism of Ursa Major has been known for centuries by the people of Thailand as the Crocodile. The Thai Astronomical Society thus proposes to name 47 Ursae Majoris as the legendary Chalawan, the great crocodile from a popular Thai folk tale ‘The Legend of Krai Thong’. Lord Chalawan was a large, powerful and aggressive crocodile made invulnerable by the magic of his crystal tooth. His lair was an underwater cave in the town of Phichit. The cave had an enchanted crystal that turned Lord Chalawan into a human when he was in the cave. Lord Chalawan abducted Taphao Thong and took her to his cave. He was later defeated by Krai Thong.
47 Ursae Majoris b Taphao Thong
Taphao Thong was the eldest daughter of the rich man of Phichit. She was taken by Lord Chalawan, the great crocodile, to his underwater cave. Taphao Thong lived with Lord Chalawan until she was rescued by Krai Thong.
47 Ursae Majoris c Taphao Kaew
Taphao Kaew, Taphao Thong’s sister, was the youngest daughter of the rich man of Phichit. She witnessed Taphao Thong’s abduction by Lord Chalawan, the great crocodile. After Krai Thong defeated Chalawan the rich man gave Taphao Kaew to Krai Thong as promised.

In Thailand, the asterism of the Great Bear constellation—or Ursa Major—is well known as the Crocodile stars. A popular nursery rhyme describes its movement in the night sky. Hence the proposal by the Thai Astronomical Society to name the 47 Ursae Majoris system as characters from a Thai folk tale centred around a great crocodile. Some of the names proposed were contributed by the Thai public who responded to the Thai Astronomical Society’s call to name exoplanets between 7 November 2014 and 23 January 2015. A summary of the story, the Legend of Krai Thong, is as follows:

Lord Chalawan was a large, powerful and aggressive crocodile who lived with his cohort in an underwater cave in the town of Phichit. The cave had an enchanted crystal with a power to turn any crocodile in the cave into human. One day while Lord Chalawan went out to feed, he spied the sisters Taphao Thong and Taphao Kaew, daughters of the rich man of Phichit, bathing in the river. Enamored with Taphao Thong, Lord Chalawan seized her in his mouth and carried her back to his lair. The rich man learned that a crocodile took his daughter away and paid many crocodile hunters to capture and kill the culprit crocodile. But Lord Chalawan was invincible due to the magic of his crystal tooth. No crocodile hunter came back alive.

The ultimate crocodile hunter to take the challenge was Krai Thong, a young merchant adventurer well versed in magic and possessor of Sattaloha spear, the only weapon that could hurt Lord Chalawan. Krai Thong used magic to summon Lord Chalawan up for a fight. The losing Lord Chalawan fled to his lair with Krai Thong in close pursuit. In the underwater cave Krai Thong overpowered the human Lord Chalawan and freed Taphao Thong. With Lord Chalawan in harness, Krai Thong took Taphao Thong back to her father. Lord Chalawan was slain by Sattaloha. As promised, the rich man gave Taphao Kaew along with half of this wealth to Krai Thong. As for Taphao Thong, the rich man also married her to Krai Thong since the crocodile hunter was her rescuer.

Youtube Link
Star name / planet name Proposed names
47 Ursae Majoris Cervino150
2015 is the 150th Anniversary of the Cervino's first ascent. Cervino (Matterhorn in German) is a 4478 meters high mountain in the Alps, on the border between Italy and Switzerland.
47 Ursae Majoris b Whymper
The british climber Edward Whymper reached the Cervino's summit from the Swiss side, together with his 6 members rope team, on 14th July 1865.
47 Ursae Majoris c Carrel
The italian climber Jean Antoine Carrel, reached the peak from the italian side, together with his rope team, on 17th July 1865.

150 years ago humans explored the world's highest mountains, today they are discovering Exoplanets and perhaps one day they will reach a Solar System planet.
Whymper and Carrel, during their ascents of the Cervino bivouacked at high altitude. Before they fell asleep they could observe a wonderful sky, full of stars: 47 Ursae Majoris was one of those.

Youtube Link
Star name / planet name Proposed names
47 Ursae Majoris Päivä
In the Finnish language the word "Päivä" means "day", but the old meaning is also "the Sun".
47 Ursae Majoris b Aamu
"Morning" in the Finnish language.
47 Ursae Majoris c Ilta
"Evening" in the Finnish language.
Star name / planet name Proposed names
47 Ursae Majoris Shatir
Alaa al-Din Ali ibn-Ibrahim Ibn-al-Shatir born and died in Damascus (Syria), (1305-1375), was the most distinguished Muslim astronomer of the 14th century. His most significant contribution to astronomy was his planetary theory. In his planetary models, Ibn-al-Shaṭir incorporated various ingenious modifications of those of Ptolemy. Also, with the reservation that they are geocentric, his models are the same as a number used by Copernicus. Ibn-al-Shatir’s planetary theory was investigated for the first time in the 1950s, and the discovery that his models were mathematically identical to those of Copernicus raised the very interesting question of a possible transmission of his planetary theory to Europe.
In "Nihayat al‐sul fi taṣḥiḥ al‐uṣul" (A final inquiry concerning the rectification of planetary theory), Ibn-al-Shaṭir presented the reasoning behind his new planetary models. The essence of Ibn-al-Shaṭir's planetary theory is the apparent removal of the eccentric deferent and equant of the Ptolemaic models, with secondary epicycles used instead. Finally, Ibn-al-Shaṭir's "al‐Zij al‐jadid" (The new astronomical handbook), extant in several manuscript copies, contains a new set of planetary tables based on his new theory and parameters.
Several works by the scholars of the mid‐13th century observatory at Maragha are mentioned in Ibn-a-Shatir’s introduction to this treatise, and it is clear that these were the main sources of inspiration for his own Non‐Ptolemaic planetary models.
Ibn-al-Shatir designed and constructed a magnificent horizontal sundial that was erected on the northern minaret of the Umayyad Mosque in Damascus.
47 Ursae Majoris b Aklim
Aklim means the planet in berber language (a family of similar languages in north Africa). Aklim is a mount which culminates at an altitude of 2390 m, located in the Anti-Atlas mountains in the South of Morocco. Mount Aklim was selected in 2009 by the European Space Observatory as a potential site for installing the European Extremly Large Telescope. ESO has chosen Morocco as three other countries in the world Chile, Argentina and Spain to host the EELT.
47 Ursae Majoris c Ayour
Ayour means the Moon in berber language (a family of similar languages in north Africa).