HD 81688

Artist impression by ESO/L. Calçada/Nick Risinger

HD 81688

Star details
  • Constellation: the Great Bear
  • Vmag: 5.4
  • Visibility: Visible to the naked eye
  • Number of Planets: 1

Planet details

HD 81688 b

  • Mass (Jupiters): 2.7
  • Mass (Earths): 858.1
  • Period (days): 184.02
  • Semi Major Axis (AU): 0.81

Proposed names

Star name / planet name Proposed names
HD 81688 Rosalind
Rosalind Franklin's x-ray crystallography work played a large role in determining the structure of DNA, the molecule from which all life finds itself derived. Rosalind's contributions to the fields of both biology and biochemistry, while not fully recognized until after her death, affirm her place among the 'greats' of science, not to mention her role as an inspirational figure for women in the sciences.
Naming a foreign star after such an individual would serve as a testament to her contributions to science, as well as a reminder to future aspiring scientists to never stop asking questions, to never stop moving forwards.
HD 81688 b Hippocrates
Hippocrates is often referred to as the “Father of Western Medecine”, reflecting his lasting contributions to the development of medicinal practices which still demonstrate their impacts to this day. Most notable of Hippocrates' teachings was the belief that disease was a product of environmental factors, and not of a mystical origin. Naming an exoplanet after such a pivotal figure in the history of medicine would paying homage to a man for which we modern day society owes so much.
Star name / planet name Proposed names
HD 81688 Eriqqu
"Eriqqu" is the Akkadian word for "Wagon". It remembers the Babylonian name of what became the modern constellation of the Great Bear, one of the oldest documented to be known to humanity. The "Wagon" already appears in a text of the Old-Babylonian era. It stands for one of the longest surviving concepts that has been passed through and adopted by many cultures on our planet.
HD 81688 b Bibbu
"Bibbu" is an Akkadian word for planet. "Bibbu", literally meaning "wild sheep" was used to refer to the wandering "stars" by Babylonians. The way how sheep moved around may well have been used as an analogy to the often complicated appearance of the motion of the solar system's planets when they are observed from Earth. "Bibbu"'s simple and clear motion as observed from Earth celebrates the millennia long effort of humanity to understand the fundamental laws of the motion of all planets.

The first theory of planetary phenomena is of Babylonian origin. It resulted from systematic observations over many hundreds of years that are documented and preserved as original cuneiform tablets in archives worldwide. Records reach back to the first millennium before the common era. The naming celebrates this early cultural and scientific achievement by often unknown scholars.

Eriqqu - also know as HIP 46471 in the HIPPARCOS catalogue - is in the constellation of Ursa Majoris, the Great Bear. Some of its brightest stars are known as "Wagon" in many Eurasian cultures (1). The name literally survived over more than 3000 years into the present as the "Großer Wagen" ("Great Wagon") in German language. The Babylonian "Eriqqu" thus became a lasting bridge between cultures and times.

Naming one of the first planets outside the solar system and its host star with the Akkadian terms "Eriqqu" (2) and "Bibbu" (3) should also serve as a reminder that a long way may lie ahead of us until we understand the surprising properties of the new planets - Bibbu, e.g. is measured with a mass of more than twice the one of the largest planet of the solar system. The ancient names remember the historic modern step of understanding that has been completed across the vast space that separates us from the worlds of neighbouring stars. They remind us that many more steps may well be necessary until we will finally be able to better understand how the solar system fits into the diversity of planetary systems in our Galaxy.

"Eriqqu" and "Bibbu" remember how a new perspective has taken shape as a result of Astronomy in the first decades with planets known to orbit stars other then the Sun. No less surprises have to be expected than those that followed when the Babylonian theories and observations were taken up in Hipparch's and Ptolemy's time.

(1) Erica Reiner, "Astral Magic in Babylonia", Transactions of the American Philosophical Society, New Ser., Vol. 85, No. 4 (1995),
i-xiii+l- 150, p. 56
(2) ibid.
(3) Hermann Hunger, in Reallexikon der Assyriologie und Vorderasiatischen Archäologie, Band 10, von Erich Ebeling, Dietz Otto Edzard, Michael P. Streck, de Gruyter, Berlin 2005.

Star name / planet name Proposed names
HD 81688 Intercrus
Meaning between the legs in the Latin style. From that position sandwiched between the feet of Ursa Major.
HD 81688 b Arkas
Name of son of Callisto(Ursa Major) in Greek mythology.
Star name / planet name Proposed names
"SAKURA" is the beautiful flower which booms in spring over the world.
This flower is treated as a national flower of Japan.
HD 81688 b YAMATO
”YAMATO" is the name of famous space ship in popular japan anime, and olso the old poetic name of Japan. 
Star name / planet name Proposed names
The name of the constellation becoming the index to look for the polestar in Japan
I name it it as a thing representing it
HD 81688 b Hokuto-one
I name the planet of the sidereal group it in numerical order
Star name / planet name Proposed names
HD 81688 BABOR
The Babor Range is a mountain range of the Tell Atlas in Algeria. The highest point of the range is 2,004 m high Mount Babor. The Babor Range, together with the neighboring Bibans, is part of the mountainous natural region of small Kabylie.
HD 81688 b Lezzayer
lezzayer is the name of Algeria in Tamazight (Berber or the Amazigh languages or dialects are a family of similar and closely related languages and dialects indigenous to North Africa).
Star name / planet name Proposed names
HD 81688 Kazan
The word means "Volcano" in Japanese. It is a symbol of power and energy.
HD 81688 b Onsen
The word means "Hot spring" in Japanese. A volcano is usually surrounded
by hot springs. In Japan, a wooden dipper is used at hot springs, which
brings up the image of the Big Dipper.
Star name / planet name Proposed names
HD 81688 Hikari
A word meaning "Light" in Japanese.
HD 81688 b Mirai
A word meaning "Future" in Japanese.

“Hikari” shines on the planet and the bright future comes.

Star name / planet name Proposed names
HD 81688 出羽(DEWA)
DEWA was an ancient country name of my home town 'Yamagata Prefecture'.
HD 81688 b 瀧太郎(Takitarou)
Takitarou is a mysterious legendary fish,maybe huge white spotted char, possibly inhabiting in deep lake 'OOtori Ike' at deep mountains , 'DEWA Mountains area', located in Yamagata Prefecture.

Exoplanets and Takitarou stir up our interest and curiosity.
We hope to know their real figure some day.

Star name / planet name Proposed names
A Willow tree. According to American Indian’s myth, Big Bear was thrown up into the sky by the king of the forest. We imagine a big old willow tree as the king of the forest.
HD 81688 b RAIJU
RAIJU is a big Japanese ghost. It is revolving very fast and it makes thunder. Japanese traditionally said that a ghost appears under a big old willow tree. We imagine RAIJU related to a willow tree.
Star name / planet name Proposed names
HD 81688 Kimunkamuy
“Kimunkamuy” (Latin transcription) means “brown bear” in Ainu language. Ainu are the natives in north Japan. They believe that brown bear is one of very important gods.
HD 81688 b Heper
“Heper” (Latin transcription) means “child bear” in Ainu language.

HD81688 is a star of the Great Bear. And the planet was found by an astronomical observatory in Japan. So we offer these names.

Star name / planet name Proposed names
HD 81688 CHIBA
The name of Chiba Prefecture, located north east of Tokyo, comes from the feudal lord Chiba established around four hundred years ago.
The Chiba clan chose the Big Dipper and the polar star for the crest designed as “Kuyoumon” (literally nine stars).
The center is the polar star and the surroundings are the Big Dipper.
Chiba Shusaku, the great swordsman, created the sword school “Hokushin-Ittouryuu”, and “Hokushin” means the Big Dipper and the polar star.
We propose the name “CHIBA” for the central star HD81688, because this is apparently one of the closest Exoworlds to the Big Dipper.
HD 81688 b ABIKO
The Chiba clan’s ancestor Taira no Masakado , who also worshiped the Big Dipper and the polar star for victory,
has been an extremely popular figure in Japanese history and folk lore.
He once controlled the entire Kanto area around 940 A.D. against the central government in Kyoto which had long exploited the local people.
The story of Masakado, the hero, has been passed down from generation to generation particularly among people in Abiko
,where he was assassinated with the betrayal of his mistress according to the legend.
The local people do not plant the Kikyo flower (a.k.a. balloon flower), which is the name of the mistress,
and do not cut cucumbers horizontally to eat, because the cross sections look like the Kuyoumon.
Abiko at that time was a strategically important place in the Chiba area because of its location near the huge lake,
the much smaller remnant of which is the Tega-numa lake.
We propose the name “ABIKO” for the planet of HD81688b because of Taira no Masakado,
an ancestor of the Chiba clan and the hero for the people of ABIKO.