The name of which artificial satellite constellation system was taken from the name of the element with atomic number 77?
"between planes. Another popular constellation type is the near-polar Walker Star, which is used by Iridium. Here, the satellites are in near-polar circular orbits across approximately 180 degrees, travelling north on one side of the Earth, and south on the other. The active satellites in the full Iridium constellation form a Walker Star of 86.4°:66/6/2, i.e. the phasing repeats every two planes. Walker uses similar notation for stars and deltas, which can be confusing. At least eight telecommunications satellite constellations are in-development in and : Satellite constellation simulation tools: More information: Satellite constellation A satellite constellation is a group of"
"largest radar, 70-meter Eupatoria Planetary Radar. The message was named Cosmic Call 1; it was sent on July 1, 1999, and it will arrive at Gliese 777 in April 2051. Gliese 777 Gliese 777, often abbreviated as Gl 777 or GJ 777, is a yellow subgiant approximately 52 light-years away in the constellation of Cygnus. The system is also a binary star system made up of two stars and possibly a third. As of 2005, two extrasolar planets are known to orbit the primary star. The primary star of the system (catalogued as Gliese 777A) is a yellow subgiant, a"
"74 Aquarii 74 Aquarii (abbreviated 74 Aqr) is a triple star system in the constellation of Aquarius. ""74 Aquarii"" is its Flamsteed designation and it also bears the variable star designation HI Aquarii. The combined apparent visual magnitude is 5.8 and it is located at a distance of from Earth. The inner pair of stars form a double-lined spectroscopic binary, where the presence of both components is revealed from the Doppler shift of their spectral lines. The spectroscopic binary was discovered and the orbit calculated by Richard J. Wolff of the University of Hawaii in 1974. A refined orbit was"
"87 Sylvia, 93 Minerva, 107 Camilla, 130 Elektra and 216 Kleopatra. It is named after the Canadian astronomer David Balam, principal observer at Victoria's Climenhaga Observatory in British Columbia. The approved naming citation was published by the Minor Planet Center on 31 May 1988 (). 3749 Balam 3749 Balam, provisionally known as , is a stony Florian asteroid and rare trinary system orbiting in the inner regions of asteroid belt. It was discovered on 24 January 1982, by American astronomer Edward Bowell at Lowell's Anderson Mesa Station near Flagstaff, Arizona, and named after Canadian astronomer David Balam. ""Balam"" measures approximately"
"while its companion is A7 V. Their composite spectrum shows the properties of a Lambda Boötis star, which means it displays peculiar abundances of certain elements. 97 Aquarii 97 Aquarii (abbreviated 97 Aqr) is a binary star system in the equatorial constellation of Aquarius. ""97 Aquarii"" is the Flamsteed designation. The combined apparent visual magnitude of the system is 5.20; the brighter star is magnitude 5.59 while the companion is magnitude 6.72. Based upon an annual parallax shift of 15.30 milliarcseconds, this system is at a distance of around from Earth. The two stars in this system orbit each other"
"Messier 77 Messier 77 or M77, also known as NGC 1068, is a barred spiral galaxy about 47 million light-years away in the constellation Cetus. Messier 77 was discovered by Pierre Méchain in 1780, who originally described it as a nebula. Méchain then communicated his discovery to Charles Messier, who subsequently listed the object in his catalog. Both Messier and William Herschel described this galaxy as a star cluster. Today, however, the object is known to be a galaxy. The morphological classification of NGC 1068 in the De Vaucouleurs system is (R)SA(rs)b, where the '(R)' indicates an outer ring-like structure,"
"the primary is probably due to the companion star. In the ""Defiance"" TV series episode ""Of a Demon in My View"", the Omec ship ""Tsuroz"" was in this system in 1978 when they picked up a radio signal from Earth. HR 7703 HR 7703 (Gliese 783, 279 G. Sagittarii) is a binary star system in the constellation of Sagittarius. The brighter component has an apparent visual magnitude of 5.31, which means it is visible from suburban skies at night. The two stars are separated by an angle of 7.10″, which corresponds to an estimated semimajor axis of 56.30 AU for"
"as Kepler-47. Kepler-47c Kepler-47c (also known as Kepler-47(AB)-c and by its Kepler Object of Interest designation ""KOI-3154.02"") is an exoplanet orbiting the binary star system Kepler-47, the outermost of three such planets discovered by NASA's ""Kepler"" spacecraft. The system, also involving two other exoplanets, is located about 3,400 light-years (1,060 parsecs) away in the constellation Cygnus. The binary system is the first to be found with more than one circumbinary planet. The planet orbits at around the same distance as Earth does from the Sun, placing it within the habitable zone. Kepler-47c is a gas giant, an exoplanet that is"
"HR 7703 HR 7703 (Gliese 783, 279 G. Sagittarii) is a binary star system in the constellation of Sagittarius. The brighter component has an apparent visual magnitude of 5.31, which means it is visible from suburban skies at night. The two stars are separated by an angle of 7.10″, which corresponds to an estimated semimajor axis of 56.30 AU for their orbit. Based upon an annual parallax shift of 0.16625 arc seconds as measured by the Hipparcos satellite, this system is from Earth. It is approaching the Solar System at a velocity of approximately 129 kilometers per second. At this"
"rather than entire multiple systems. It approved the name ""Secunda Hyadum"" for the component Delta¹ Tauri Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. In Chinese, (), meaning ""Net"", refers to an asterism consisting of δ¹ Tauri, Epsilon Tauri, Delta³ Tauri, Gamma Tauri, Alpha Tauri (Aldebaran), 71 Tauri and Lambda Tauri. Consequently, Delta¹ Tauri itself is known as (), ""the Third Star of Net"". Delta¹ Tauri A is a single-lined spectroscopic binary with an orbital period of 529.8 days and an eccentricity of 0.42. The visible member, component Aa, is"
"Nu1 Sagittarii Nu¹ Sagittarii (ν¹ Sagittarii, abbreviated Nu¹ Sgr, ν¹ Sgr) is a triple star system lying approximately 1,100 light-years from Earth. Its three components are designated Nu¹ Sagittarii A (also named Ainalrami), B and C. A and B themselves form a spectroscopic binary. ""ν¹ Sagittarii"" (Latinised to ""Nu¹ Sagittarii"") is the system's Bayer designation. Nu¹ and Nu² Sagittarii (together designated Nu Sagittarii) bore the traditional name ""Ain al Rami"", which is from the Arabic عين الرامي ""ain ar-rāmī"" meaning 'eye of the archer'. In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize"
"Kepler-47c Kepler-47c (also known as Kepler-47(AB)-c and by its Kepler Object of Interest designation ""KOI-3154.02"") is an exoplanet orbiting the binary star system Kepler-47, the outermost of three such planets discovered by NASA's ""Kepler"" spacecraft. The system, also involving two other exoplanets, is located about 3,400 light-years (1,060 parsecs) away in the constellation Cygnus. The binary system is the first to be found with more than one circumbinary planet. The planet orbits at around the same distance as Earth does from the Sun, placing it within the habitable zone. Kepler-47c is a gas giant, an exoplanet that is near the"
"include 87 Sylvia, 107 Camilla, 45 Eugenia, 121 Hermione, 130 Elektra, 22 Kalliope, 283 Emma, 379 Huenna and 243 Ida (in order of decreasing primary size). Some binary systems have a mass ratio near unity, i.e., two components of similar mass. They include 90 Antiope, , and 69230 Hermes, with average component diameters of 86, 1.8, 0.9 and 0.3 km, respectively. Several theories have been posited to explain the formation of binary-asteroid systems. Many systems have significant macro-porosity (a ""rubble-pile"" interior). The satellites orbiting large main-belt asteroids such as 22 Kalliope, 45 Eugenia or 87 Sylvia may have formed by"
"Messier 75 Messier 75 or M75, also known as NGC 6864, is a globular cluster of stars in the southern constellation Sagittarius. It was discovered by Pierre Méchain in 1780 and included in Charles Messier's catalog of comet-like objects that same year. M75 is at a distance of about 67,500 light years away from Earth and is 14,700 light years away from, and on the opposite side of, the Galactic Center. Its apparent size on the sky translates to a true radius of some 67 light years. M75 is classified as class ""I"", meaning it is one of the more"
"75 Cancri 75 Cancri (abbreviated to 75 Cnc) is a binary star in the constellation of Cancer. The system is located about 102 light-years (31 parsecs) away, based on its stellar properties. 75 Cancri is a spectroscopic binary, which means the two stellar components are too close to be resolved, but periodic Doppler shifts in their spectra indicate orbital motion. In this case, light from both stars can be detected, and it is a double-lined spectroscopic binary. The orbital period of the system is 19.41 days, and the eccentricity of the system is 0.19494, implying a slightly elliptical orbit. The"
"was his fourteenth and last asteroid discovery. It is named after Panopea, a nymph in Greek mythology; the name was chosen by Robert Main, President of the Royal Astronomical Society. In 1862, Swedish astronomer Nils Christoffer Dunér gave a doctoral thesis on the orbital elements of this asteroid. The orbit of 70 Panopaea places it in a mean motion resonance with the planets Jupiter and Saturn. The computed Lyapunov time for this asteroid is 24,000 years, indicating that it occupies a chaotic orbit that will change randomly over time because of gravitational perturbations of the planets. The asteroid frequently makes"
"Messier 70 Messier 70 or M70, also known as NGC 6681, is a globular cluster of stars in the southern constellation of Sagittarius. It was discovered by Charles Messier on August 31, 1780. The famous comet Hale–Bopp was discovered near this cluster July 23, 1995. M70 is at a distance of about 29,400 light years away from Earth and around from the Galactic Center. It is roughly the same size and luminosity as its neighbour in space, M69. M70 has a very small core radius of and a half-light radius of . This cluster has undergone core collapse, leaving it"
"Gliese 777 Gliese 777, often abbreviated as Gl 777 or GJ 777, is a yellow subgiant approximately 52 light-years away in the constellation of Cygnus. The system is also a binary star system made up of two stars and possibly a third. As of 2005, two extrasolar planets are known to orbit the primary star. The primary star of the system (catalogued as Gliese 777A) is a yellow subgiant, a Sun-like star that is ceasing fusing hydrogen in its core. The star is much older than the Sun, about 6.7 billion years old. It is 4% less massive than the"
"64 Piscium 64 Piscium is the Flamsteed designation for a close binary star system in the zodiac constellation of Pisces. It can be viewed with the naked eye, with the components having a combined apparent visual magnitude of 5.07. An annual parallax shift of 42.64 mas provides a distance estimate of 46.5 light years. The system is moving further from the Sun with a radial velocity of +3.76 km/s. This is a double-lined spectroscopic binary system consisting of two similar components designated Aa and Ab. The initial orbital elements were determined by Abt and Levy (1976), giving an orbital period"
"multiple systems. It approved the name ""Cujam"" for the component Omega Herculis A on February 1, 2017 and it is now so included in the List of IAU-approved Star Names. In Chinese, (), meaning ""Dipper for Liquid"", refers to an asterism consisting of Omega Herculis, 49 Serpentis, 13 Herculis, 29 Herculis and 33 Herculis. Consequently, Omega Herculis itself is known as (, ). The primary, Omega Herculis A, is a chemically peculiar Ap star with a stellar classification of A2 Vp CrSr. The spectrum displays abnormally strong absorption lines of chromium and strontium, and weak lines of calcium and magnesium."
"WASP-17. The discovery of the J1407 system and its unusual eclipses were first reported by a team led by University of Rochester astronomer Eric Mamajek in 2012. The existence and parameters of the ring system around the substellar companion J1407b were deduced from the observation of a very long and complex eclipse of the previously anonymous star J1407 during a 56-day period during April and May 2007. The low-mass companion J1407b has been referred to as a ""Saturn on steroids"" or “Super Saturn” due to its massive system of circumplanetary rings with a radius of approximately 90 million km (0.6"
"171 Ophelia Ophelia (minor planet designation: 171 Ophelia) is a large, dark Themistian asteroid that was discovered by French astronomer Alphonse Borrelly on 13 January 1877, and named after the fictional character Ophelia in Shakespeare's play ""Hamlet"". This asteroid is a member of the Themis family of asteroids that share similar orbital elements. It probably has a primitive composition, similar to that of the carbonaceous chondrite meteorites. A 1979 study of the Algol-like light curve produced by this asteroid concluded that it was possible to model the brightness variation by assuming a binary system with a circular orbit, a period"
"and dust. This is a spectroscopic binary system where the presence of an orbiting companion is revealed by shifts in the spectral lines caused by the Doppler effect. The primary component is a giant star with a stellar classification of G8 III. The secondary is following a circular orbit with a period of 205.2 days. 71 Aquilae 71 Aquilae (abbreviated 71 Aql) is a binary star in the equatorial constellation of Aquila. ""71 Aquilae"" is its Flamsteed designation though it also bears the Bayer designation l Aquilae. The apparent visual magnitude of the system is 4.33, making it bright enough"
"(IAU). The system bore the traditional name ""Polis"", which is derived from a Coptic word meaning ""foal"". In 2016, the IAU organized a Working Group on Star Names (WGSN) to catalog and standardize proper names for stars. The WGSN decided to attribute proper names to individual stars rather than entire multiple systems. It approved the name ""Polis"" for the component Mu Sagittarii Aa on 5 September 2017 and it is now so included in the List of IAU-approved Star Names. In Chinese, (), meaning ""Dipper"", refers to an asterism consisting of Mu Sagittarii, Phi Sagittarii, Lambda Sagittarii, Sigma Sagittarii, Tau"
"71 Aquilae 71 Aquilae (abbreviated 71 Aql) is a binary star in the equatorial constellation of Aquila. ""71 Aquilae"" is its Flamsteed designation though it also bears the Bayer designation l Aquilae. The apparent visual magnitude of the system is 4.33, making it bright enough to be viewed by the naked eye. It has an annual parallax shift of 9.67 mas, which equates to a physical distance of from Earth, give or take a 30 light-year margin of error. At this distance, the brightness of the system is diminished by 0.065 in visual magnitude from extinction caused by interstellar gas"
"Kepler-47 Kepler-47 is a binary star system with at least three planets in orbit around the pair of stars located about 3,400 light-years away from Earth. The first two planets announced are designated Kepler-47b, and Kepler-47c. Kepler-47 is the first circumbinary multi-planet system discovered by the Kepler mission. The outermost of the planets is a gas giant orbiting within the habitable zone of the stars. Because most stars are binary, the discovery that multi-planet systems can form in such a system impacts theories of planetary formation. A group of scientists from NASA and Tel-Aviv University in Israel discovered the system"
"NGC 147 NGC 147 (also known as DDO3 or Caldwell 17) is a dwarf spheroidal galaxy about 2.58 Mly away in the constellation Cassiopeia. NGC 147 is a member of the Local group of galaxies and a satellite galaxy of the Andromeda Galaxy (M31). It forms a physical pair with the nearby galaxy NGC 185, another remote satellite of M31. It was discovered by John Herschel in September 1829. Visually it is both fainter and slightly larger than NGC 185 (and therefore has a considerably lower surface brightness). This means that NGC 147 is more difficult to see than NGC"
"55 Cancri 55 Cancri ( or ) (abbreviated 55 Cnc) is a binary star approximately 41 light-years away from the Sun in the constellation of Cancer. The system consists of a G-type star (designated 55 Cancri A, also named Copernicus) and a smaller red dwarf (55 Cancri B). , five extrasolar planets (designated 55 Cancri b, c, d, e and f; named Galileo, Brahe, Lipperhey, Janssen and Harriot, respectively) are believed to orbit 55 Cancri A. 55 Cancri is the system's Flamsteed designation. It also bears the Bayer designation ρ¹ Cancri (Latinised to Rho¹ Cancri) and the Bright Star Catalogue"
"orbital elements. In observations made from 1990 to 1992, Eta Andromedae was resolved interferometrically by the Mark III Stellar Interferometer at Mount Wilson Observatory, California, United States. This allowed a more complete orbit to be computed and, in 1993, published. In Chinese, (), meaning ""Legs (asterism)"", refers to an asterism consisting of η Andromedae, 65 Piscium, ζ Andromedae, ε Andromedae, δ Andromedae, π Andromedae, ν Andromedae, μ Andromedae, β Andromedae, σ Piscium, τ Piscium, 91 Piscium, υ Piscium, φ Piscium, χ Piscium and ψ¹ Piscium. Consequently, η Andromedae itself is known as (, .) Eta Andromedae has a visual companion"
"47 Tauri 47 Tauri (abbreviated to 47 Tau) is a binary star in the zodiac constellation of Taurus. Parallax measurements made by the Hipparcos spacecraft put it at a distance of about 330 light-years (102 parsecs) from Earth. The system has a combined apparent magnitude of about 4.89, meaning it can be faintly seen with the naked eye, according to the Bortle scale. 47 Tauri is a visual binary, meaning that the two components can be resolved, and the orbit is derived from the positions of the two stars. The primary component is a G-type giant. Its radius is about"
"97 Aquarii 97 Aquarii (abbreviated 97 Aqr) is a binary star system in the equatorial constellation of Aquarius. ""97 Aquarii"" is the Flamsteed designation. The combined apparent visual magnitude of the system is 5.20; the brighter star is magnitude 5.59 while the companion is magnitude 6.72. Based upon an annual parallax shift of 15.30 milliarcseconds, this system is at a distance of around from Earth. The two stars in this system orbit each other over a period of 64.62 years at an eccentricity of 0.14. Both are A-type main sequence stars; the primary has a stellar classification of A2 V"
"A1V+A. The two components orbit each other with an period of 129 years. Lambda Ophiuchi Lambda Ophiuchi (λ Ophiuchi, abbreviated Lambda Oph, λ Oph) is a triple star system in the constellation of Ophiuchus. It is approximately 170 light-years from the Sun, based on its parallax. The system consists of a binary pair, designated Lambda Ophiuchi AB, together with a third companion, C. AB's two components are themselves designated Lambda Ophiuchi A (also named Marfik) and B. ""λ Ophiuchi"" (Latinised to ""Lambda Ophiuchi"") is the system's Bayer designation. The designations of the three components as ""Lambda Ophiuchi A"", ""B"" and"
"Gliese 777 b Gliese 777 b, also known as Gliese 777 Ab or HD 190360 b, is an extrasolar planet approximately 52 light-years away in the constellation of Cygnus. The planet was discovered orbiting the primary star of the Gliese 777 system in June 2002 (by the Geneva Extrasolar Planet Search Team) using the radial velocity method. The planet is at least one half more massive than Jupiter but roughly the same size as Jupiter. Because the inclination of the planet's orbit is not known, the true mass is unknown. But it is unlikely to be much more than the"