38 relations: Accretion disk, Aerobee, American Association of Variable Star Observers, American Science and Engineering, Angular resolution, Apparent magnitude, Cambridge, Massachusetts, Catalogue of spectroscopic binary orbits, Declination, Eddington luminosity, Epoch (astronomy), Extreme Ultraviolet Explorer, Flux, Galactic Center, Globular cluster, H, INTEGRAL, International Astronomical Union, Iosif Shklovsky, Light, Light-year, List of X-ray pulsars, Neutron star, Pulsar, Riccardo Giacconi, Right ascension, Scorpius, Sky, Solar mass, Solar System, Star, Sun, Watt, Wavelength, X-ray, X-ray binary, 2MASS, 2RE.
An accretion disk is a structure (often a circumstellar disk) formed by diffused material in orbital motion around a massive central body.
The Aerobee rocket was a small (8 m) unguided suborbital sounding rocket used for high atmospheric and cosmic radiation research in the United States in the 1950s.
Since its founding in 1911, the American Association of Variable Star Observers (AAVSO) has coordinated, collected, evaluated, analyzed, published, and archived variable star observations made largely by amateur astronomers and makes the records available to professional astronomers, researchers, and educators.
American Science and Engineering Inc, (AS&E) is an American manufacturer of advanced X-ray equipment and related technologies, originating in 1958 as a developer for NASA, with an early focus on X-ray astronomy led by Riccardo Giacconi.
Angular resolution or spatial resolution describes the ability of any image-forming device such as an optical or radio telescope, a microscope, a camera, or an eye, to distinguish small details of an object, thereby making it a major determinant of image resolution.
The apparent magnitude of a celestial object is a number that is a measure of its brightness as seen by an observer on Earth.
Cambridge is a city in Middlesex County, Massachusetts, and part of the Boston metropolitan area.
The catalogue of spectroscopic binary orbits (SB) is a compilation of orbital data for spectroscopic binary stars which have been produced since 1969 by Alan Henry Batten of the Dominion Astrophysics Observatory and various collaborators.
In astronomy, declination (abbreviated dec; symbol δ) is one of the two angles that locate a point on the celestial sphere in the equatorial coordinate system, the other being hour angle.
The Eddington luminosity, also referred to as the Eddington limit, is the maximum luminosity a body (such as a star) can achieve when there is balance between the force of radiation acting outward and the gravitational force acting inward.
In astronomy, an epoch is a moment in time used as a reference point for some time-varying astronomical quantity, such as the celestial coordinates or elliptical orbital elements of a celestial body, because these are subject to perturbations and vary with time.
The Extreme Ultraviolet Explorer (EUVE) was a space telescope for ultraviolet astronomy, launched on June 7, 1992.
Flux describes the quantity which passes through a surface or substance.
The Galactic Center is the rotational center of the Milky Way.
A globular cluster is a spherical collection of stars that orbits a galactic core as a satellite.
H (named aitch or, regionally, haitch, plural aitches)"H" Oxford English Dictionary, 2nd edition (1989); Merriam-Webster's Third New International Dictionary of the English Language, Unabridged (1993); "aitch" or "haitch", op.
INTErnational Gamma-Ray Astrophysics Laboratory (INTEGRAL) is a currently operational space telescope for observing gamma rays.
The International Astronomical Union (IAU; Union astronomique internationale, UAI) is an international association of professional astronomers, at the PhD level and beyond, active in professional research and education in astronomy.
Iosif Samuilovich Shklovsky (Ио́сиф Самуи́лович Шкло́вский; sometimes transliterated Josif, Josif, Shklovskii, Shklovskij) (July 1, 1916 – March 3, 1985) was a Soviet astronomer and astrophysicist.
Light is electromagnetic radiation within a certain portion of the electromagnetic spectrum.
The light-year is a unit of length used to express astronomical distances and measures about 9.5 trillion kilometres or 5.9 trillion miles.
This is a partial list of known accretion-powered pulsars, as of 1997.
A neutron star is the collapsed core of a large star which before collapse had a total of between 10 and 29 solar masses.
A pulsar (from pulse and -ar as in quasar) is a highly magnetized rotating neutron star or white dwarf that emits a beam of electromagnetic radiation.
Riccardo Giacconi (born October 6, 1931) is an Italian Nobel Prize-winning astrophysicist who laid the foundations of X-ray astronomy.
Right ascension (abbreviated RA; symbol) is the angular distance measured only eastward along the celestial equator from the Sun at the March equinox to the (hour circle of the) point above the earth in question.
Scorpius is one of the constellations of the zodiac.
The sky (or celestial dome) is everything that lies above the surface of the Earth, including the atmosphere and outer space.
The solar mass is a standard unit of mass in astronomy, equal to approximately.
The Solar SystemCapitalization of the name varies.
A star is type of astronomical object consisting of a luminous spheroid of plasma held together by its own gravity.
The Sun is the star at the center of the Solar System.
The watt (symbol: W) is a unit of power.
In physics, the wavelength is the spatial period of a periodic wave—the distance over which the wave's shape repeats.
X-rays make up X-radiation, a form of electromagnetic radiation.
X-ray binaries are a class of binary stars that are luminous in X-rays.
The Two Micron All-Sky Survey, or 2MASS, was an astronomical survey of the whole sky in the infrared spectrum and one of the most ambitious such projects.
2RE is a commercial radio station that broadcasts to the Mid North Coast of New South Wales, Australia from its studios at Taree, near Forster.