20 relations: Apparent magnitude, Chandra X-ray Observatory, Constellation, Convection, Exoplanet, Henry Draper Catalogue, Hot Jupiter, List of exoplanets, Lithium, Magnetic field, Phoenix (constellation), PPM Star Catalogue, Smithsonian Astrophysical Observatory Star Catalog, Solar mass, Southern Hemisphere, Star, Stellar atmosphere, WASP-18b, Wide Angle Search for Planets, X-ray.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
The Chandra X-ray Observatory (CXO), previously known as the Advanced X-ray Astrophysics Facility (AXAF), is a Flagship-class space observatory launched on STS-93 by NASA on July 23, 1999.
A constellation is a group of stars that are considered to form imaginary outlines or meaningful patterns on the celestial sphere, typically representing animals, mythological people or gods, mythological creatures, or manufactured devices.
Convection is the heat transfer due to bulk movement of molecules within fluids such as gases and liquids, including molten rock (rheid).
An exoplanet or extrasolar planet is a planet outside our solar system.
The Henry Draper Catalogue (HD) is an astronomical star catalogue published between 1918 and 1924, giving spectroscopic classifications for 225,300 stars; it was later expanded by the Henry Draper Extension (HDE), published between 1925 and 1936, which gave classifications for 46,850 more stars, and by the Henry Draper Extension Charts (HDEC), published from 1937 to 1949 in the form of charts, which gave classifications for 86,933 more stars.
Hot Jupiters are a class of gas giant exoplanets that are inferred to be physically similar to Jupiter but that have very short orbital period (P The close proximity to their stars and high surface-atmosphere temperatures resulted in the moniker "hot Jupiters". Hot Jupiters are the easiest extrasolar planets to detect via the radial-velocity method, because the oscillations they induce in their parent stars' motion are relatively large and rapid compared to those of other known types of planets. One of the best-known hot Jupiters is 51 Pegasi b. Discovered in 1995, it was the first extrasolar planet found orbiting a Sun-like star. 51 Pegasi b has an orbital period of about 4 days.
This is a list of exoplanets.
Lithium (from lit) is a chemical element with symbol Li and atomic number 3.
A magnetic field is a vector field that describes the magnetic influence of electrical currents and magnetized materials.
Phoenix is a minor constellation in the southern sky.
The PPM Star Catalogue (Positions and Proper Motions Star Catalogue) is the successor of the SAO Catalogue.
The Smithsonian Astrophysical Observatory Star Catalog is an astrometric star catalogue.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
The Southern Hemisphere is the half of Earth that is south of the Equator.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
The stellar atmosphere is the outer region of the volume of a star, lying above the stellar core, radiation zone and convection zone.
WASP-18b is an extrasolar planet that is notable for having an orbital period of less than one day.
WASP or Wide Angle Search for Planets is an international consortium of several academic organisations performing an ultra-wide angle search for exoplanets using transit photometry.
X-rays make up X-radiation, a form of electromagnetic radiation.