HD 179949 b is an extrasolar planet discovered by the

Anglo-Australian Planet Search The Anglo Australian Planet Search or (AAPS) is a long-term astronomical survey started in 1998 and continuing to the present. It is being carried out on the 3.9-metre Anglo-Australian Telescope (AAT) of the Anglo-Australian Observatory in Austral ...

at the

Anglo-Australian Observatory The Australian Astronomical Observatory (AAO), formerly the Anglo-Australian Observatory, was an optical and near-infrared astronomy observatory with its headquarters in North Ryde in suburban Sydney, Australia. Originally funded jointly by the U ...

, which orbits the

star A star is an astronomical object comprising a luminous spheroid of plasma (physics), plasma held together by its gravity. The List of nearest stars and brown dwarfs, nearest star to Earth is the Sun. Many other stars are visible to the naked ...

HD 179949 HD 179949 is a 6th magnitude star in the constellation of Sagittarius. It is a yellow-white dwarf (spectral class F8 V), a type of star hotter and more luminous than the Sun. The star is located about 90 light years from Earth and ...

. The planet is a so-called "

hot Jupiter Hot Jupiters (sometimes called hot Saturns) are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital periods (). The close proximity to their stars and high surface-atmosphere temp ...

", a Jupiter-mass planet orbiting very close to its parent star. In this case, orbital distance is almost one-tenth that of

Mercury Mercury commonly refers to: * Mercury (planet), the nearest planet to the Sun * Mercury (element), a metallic chemical element with the symbol Hg * Mercury (mythology), a Roman god Mercury or The Mercury may also refer to: Companies * Merc ...

from the Sun. One orbital revolution lasts only about 3

day A day is the time period of a full rotation of the Earth with respect to the Sun. On average, this is 24 hours, 1440 minutes, or 86,400 seconds. In everyday life, the word "day" often refers to a solar day, which is the length between two so ...

s. Its magnetic field induces a bright spot on its star at 30 degrees latitude, which rotates at 87 degrees inclination. If the planet orbited at 83-97 degrees, then its transit would be visible from Earth. The angle of inclination is therefore 83 degrees or less, but not much less; and its mass is constrained to not much more than 0.923±0.077. The star is not tidally locked to the planet. Assuming the planet is perfectly grey with no greenhouse or tidal effects, and a Bond albedo of 0.1, the temperature would be 1533 K. This is, like Tau Boötis b, hotter than the predicted temperature of HD 209458 b (1392K), and close to that of

HD 149026 b HD 149026 b, formally named Smertrios , is an extrasolar planet approximately 250 light-years from the Sun in the constellation of Hercules. The 2.8766-day period planet orbits the yellow subgiant star HD 149026 at a distance of and is notable ...

, before they were measured. Searches for water in the planet's atmosphere have been inconclusive at first, as have attempts to determine whether titanium and vanadium oxides are present. In the meantime, both carbon monoxide and water have been found in the dayside emission of HD 179949b. HD 179949 b is a candidate for "near-infrared characterisation.... with the VLTI Spectro-Imager". The light reflected off planet could not be detected as in 2021, implying HD 179949 b has a low albedo. The planet HD 179949 b is named Mastika. The name was selected in the NameExoWorlds campaign by

Brunei Brunei ( , ), formally Brunei Darussalam ( ms, Negara Brunei Darussalam, Jawi alphabet, Jawi: , ), is a country located on the north coast of the island of Borneo in Southeast Asia. Apart from its South China Sea coast, it is completely sur ...

, during the 100th anniversary of the

IAU The International Astronomical Union (IAU; french: link=yes, Union astronomique internationale, UAI) is a nongovernmental organisation with the objective of advancing astronomy in all aspects, including promoting astronomical research, outreach ...

. Mastika is a

Malay Malay may refer to: Languages * Malay language or Bahasa Melayu, a major Austronesian language spoken in Indonesia, Malaysia, Brunei and Singapore ** History of the Malay language, the Malay language from the 4th to the 14th century ** Indonesi ...

word, which means a gem, precious stone, jewel or the prettiest, the most beautiful.

References

External links

The Extrasolar Planets Encyclopaediaentry
{{Sky, 19, 15, 33.23, -, 24, 10, 45.67, 88.18 Hot Jupiters Sagittarius (constellation) Exoplanets discovered in 2000 Giant planets Exoplanets detected by radial velocity Exoplanets with proper names es:HD 179949#Sistema planetario ru:HD 179949#HD 179949 b