Capella (α Aur / α Aurigae / Alpha Aurigae) is the brightest star in the constellation Auriga and sixth brightest star in the sky. In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... Pierce this website is not very reliable!!!!!!!!!!!!!!!!! Some well-known constellations contain striking and familiar patterns of bright stars. ... Auriga (Latin for chariot) is a northern constellation. ... Right ascension (RA; symbol α: Greek letter alpha; celestial longitude) is the astronomical term for one of the two coordinates of a point on the celestial sphere when using the equatorial coordinate system. ... In astronomy, declination (dec) is one of the two coordinates of the equatorial coordinate system, the other being either right ascension or hour angle. ... // Headline text HEY!! HOW ARE YOU ALL?? Its nice of you to come read this page. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... Shanil Davendra Singh rules 4 life! ... Shanil Davendra Singh rules 4 life! ... Most stars are of almost constant luminosity. ... This article does not cite its references or sources. ... Radial velocity is the velocity of an object in the direction of the line of sight. ... kilometre per second is an SI derived unit of both speed (scalar) and velocity (vector), signified by the symbol km/s or km s-1. ... The proper motion of a star is the motion of the position of the star in the sky (the change in direction in which we see it, as opposed to the radial velocity) after eliminating the improper motions of the stars, which affect their measured coordinates but are not real... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... Parallax (Greek: παραλλαγή (parallagé) = alteration) is the change of angular position of two stationary points relative to each other as seen by an observer, due to the motion of an observer. ... A milliarcsecond (m, mas) , or a thoundsanth of an arcsecond. ... The distance between two points is the length of a straight line segment between them. ... A light year, abbreviated ly, is the distance light travels in one year: roughly 9. ... The parsec (symbol pc) is a unit of length used in astronomy. ... In astronomy, absolute magnitude is the apparent magnitude, m, an object would have if it were at a standard luminosity distance away from us. ... Mass is a property of a physical object that quantifies the amount of matter it contains. ... In astronomy, the solar mass is a unit of mass used to express the mass of stars and larger objects such as galaxies. ... In classical geometry, a radius of a circle or sphere is any line segment with one endpoint on the circle (i. ... In astronomy, the solar radius is a unit of length used to express the size of stars and larger objects such as galaxies. ... Luminosity has different meanings in several different fields of science. ... The solar luminosity is a unit of luminosity (power emitted in the form of photons) conventionally used by astronomers to give the luminosities of stars. ... Temperature is the physical property of a system which underlies the common notions of hot and cold; the material with the higher temperature is said to be hotter. ... The kelvin (symbol: K) is the SI unit of temperature, and is one of the seven SI base units. ... In astronomy, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium. ... Rotation of a plane, seen as the rotation of the terrain relative to the plane (exposure time 1. ... The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... A year is the time between two recurrences of an event related to the orbit of the Earth around the Sun. ... A binary star system consists of two stars both orbiting around their barycenter. ... The orbital period is the time it takes a planet (or another object) to make one full orbit. ... In geometry, the semi-major axis (also semimajor axis) a applies to ellipses and hyperbolas. ... The astronomical unit (AU or au or a. ... In astrodynamics, under standard assumptions any orbit must be of conic section shape. ... Inclination in general is the angle between a reference plane and another plane or axis of direction. ... An orbital node is one of the two points where an inclined orbit crosses a plane of reference (e. ... This article is about several astronomical terms (apogee & perigee, aphelion & perihelion, generic equivalents based on apsis, and related but rarer terms. ... In astronomy, an epoch is a moment in time for which celestial coordinates or orbital elements are specified. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... The Henry Draper Catalogue is an astronomy catalogue with astrometric and spectroscopic data about more than 225,000 stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Fifth Fundamental Catalogue is a glossary of positions of stars. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... In astronomy, many stars are referred to simply by catalogue numbers. ... Alpha (uppercase Α, lowercase α) is the first letter of the Greek alphabet. ... Pierce this website is not very reliable!!!!!!!!!!!!!!!!! Some well-known constellations contain striking and familiar patterns of bright stars. ... Auriga (Latin for chariot) is a northern constellation. ... Bright stars can be bright because they produce more light, because they are closer to us, or both. ...

A yellow star, it traditionally marks the left shoulder of the constellation's eponymous charioteer, or sometimes the goat that the charioteer is carrying. It is closer to the north celestial pole than any other first magnitude star (Polaris is only second magnitude) and as a result has played a significant role in many mythological writings. A tablet dating back to 2000 BC refers to Capella. Polaris (α UMi / α Ursae Minoris / Alpha Ursae Minoris) is the brightest star in the constellation Ursa Minor. ... (Redirected from 2000 BC) (21st century BC - 20th century BC - 19th century BC - other centuries) (3rd millennium BC - 2nd millennium BC - 1st millennium BC) Events 2064 - 1986 BC -- Twin Dynasty wars in Egypt 2000 BC -- Farmers and herders travel south from Ethiopia and settle in Kenya. ...

Astronomically, Capella's interest lies in the fact that it is an easily-studied non-eclipsing spectroscopic binary star. These two giant G-class stars have luminosities of around 50 and 80 times that of the Sun and lie less than 100 million km apart with an orbital period of 104.02 days. The stars were probably of spectral class A during their main sequence, similar to Sirius, and are in the process of becoming red giants in a few million more years as they continue to expand, cool, and brighten. Capella is a source of X-rays, probably due to surface magnetic activity on one of the pair. Capella was the first star to be imaged using a long baseline optical astronomical interferometer in observations by COAST in 1995. Lunar astronomy: the large crater is Daedalus, photographed by the crew of Apollo 11 as they circled the Moon in 1969. ... A spectroscopic binary star is a binary star which cannot be resolved as a visual binary, even with telescopes of the highest existing resolving power. ... In astronomy, stellar classification is a classification of stars based initially on photospheric temperature and its associated spectral characteristics, and subsequently refined in terms of other characteristics. ... The Sun is the spectral type G2V yellow star at the center of Earths solar system. ... Hertzsprung-Russell diagram The main sequence of the Hertzsprung-Russell diagram is the curve where the majority of stars are located in this diagram. ... Sirius (α CMa / α Canis Majoris / Alpha Canis Majoris) is the brightest star in the nighttime sky, with a visual apparent magnitude of −1. ... According to the Hertzsprung-Russell diagram, a red giant is a large non-main sequence star of stellar classification K or M; so-named because of the reddish appearance of the cooler giants. Examples include Aldebaran and Arcturus. ... In the NATO phonetic alphabet, X-ray represents the letter X. An X-ray picture (radiograph) taken by Röntgen An X-ray is a form of electromagnetic radiation with a wavelength approximately in the range of 5 pm to 10 nanometers (corresponding to frequencies in the range 30 PHz... An astronomical interferometer or hypertelescope is an array of telescopes or mirror segments acting together to probe structures on higher resolutions. ... COAST. the Cambridge Optical Aperture Synthesis Telescope, is a multi-element optical interferometer with baselines of up to 100 metres, designed to observe stars with angular resolution as high as one thousandth of one arcsecond (much higher resolution than can be obtained with individual telescopes such as the Hubble Space... 1995 (MCMXCV) was a common year starting on Sunday of the Gregorian calendar. ...

The central stars also have a faint companion that is itself a double star, consisting of two M-class red dwarf stars, that orbit at around a light year away from the main pair. This article describes the British science fiction comedy television series. ...

The name Capella means 'little she goat' in Latin, as in Roman mythology the star represented the goat Amalthea that suckled Jupiter. It was this goat whose horn, after accidentally being broken off by Jupiter, was transformed into the Cornucopia, or "horn of plenty", which would be filled with whatever its owner desired. Latin is an ancient Indo-European language originally spoken in the region around Rome called Latium. ... Roman mythology, the mythological beliefs of the people of Ancient Rome, can be considered as having two parts. ... Infancy of Zeus by Jacob Jordaens, c. ... Jupiter et Thétis - by Jean Ingres, 1811. ... The cornucopia (Latin Cornu Copiae), also known as the Horn of Plenty, is a symbol of food dating back to the 5th century BC. In Greek mythology, Amalthea raised Zeus on the milk of a goat. ...

In Hindu mythology, Capella was seen as the heart of Brahma. The star is also often labelled "the shepherd's star" in English literature. Hindu mythology is a term used by modern scholarship for a large body of Indian literature that details the lives and times of legendary personalities, deities and divine incarnations on earth interspersed with often large sections of philosophical and ethical discourse. ... Brahma (written Brahmā in IAST transliteration) (Devanagari ब्रह्मा, pronounced as brəhmα:) is the Hindu creator god, and one of the Trimurti, the others being Vishnu and Shiva. ...

Astrologically, Capella portends civic and military honors and wealth. In the Middle Ages, it was considered a Behenian fixed star with sapphire and thyme as attributes. Cornelius Agrippa listed its kabbalistic sign with the name Hircus (Latin, "goat"). Astrology refers to any of several systems, traditions or beliefs in which knowledge of the apparent positions of celestial bodies is held to be useful in understanding, interpreting, and organizing knowledge about human affairs and events on earth. ... Honor (or honor) comprises the reputation, self-perception or moral identity of an individual or of a group. ... Wealth is an abundance of items of economic value, or the state of controlling or possessing such items, and encompasses money, real estate and personal property. ... The Middle Ages formed the middle period in a traditional schematic division of European history into three ages: the classical civilization of Antiquity, the Middle Ages, and modern times, beginning with the Renaissance. ... The Behenian fixed stars are a selection of fifteen stars considered especially useful for magical applications in the medieval astrology of Europe and the Arab world. ... Sapphire is the single-crystal form of aluminium oxide (Al2O3), a mineral known as corundum. ... Species About 350 species, including: Thymus adamovicii Thymus bracteosus Thymus broussonetii Thymus caespititius Thymus camphoratus Thymus capitatus Thymus capitellatus Thymus carnosus Thymus cephalotus Thymus cherlerioides Thymus ciliatus Thymus cilicicus Thymus cimicinus Thymus comosus Thymus comptus Thymus doerfleri Thymus glabrescens Thymus herba-barona Thymus hirsutus Thymus hyemalis Thymus integer Thymus lanuginosus... Cornelius Agrippa, as portrayed in Libri tres de occulta philosophia Heinrich Cornelius Agrippa von Nettesheim (born in Köln September 14, 1486 - died in Grenoble February 18, 1535) was a magician and occult writer, astrologer, and alchemist. ... The tree of life Kabbalah (קבלה Reception, Standard Hebrew Qabbala, Tiberian Hebrew Qabbālāh; also written variously as Cabala, Cabalah, Cabbala, Cabbalah, Kabala, Kabalah, Kabbala, Qabala, Qabalah) is a religious philosophical system claiming an insight into divine nature. ... Image File history File links after Agrippa File history Legend: (cur) = this is the current file, (del) = delete this old version, (rev) = revert to this old version. ...

Alternative and former names

• Akkadian: Dil-gan I-ku ("Messenger of Light"), Dil-gan Babill ("Patron star of Babylon")
• Arabic: Alhajoth ("Goat")
• Hindu: Brahma Ridaya ("Heart of Brahma")
• Inca: Colca
• Latin: Amalthea, Hircus ("Goat")

Akkadian (lišānum akkadītum) was a Semitic language (part of the greater Afro-Asiatic language family) spoken in ancient Mesopotamia, particularly by the Assyrians and Babylonians. ... The Arabic language (Arabic: ‎ translit: ), or simply Arabic (Arabic: ‎ translit: ), is the largest member of the Semitic branch of the Afro-Asiatic language family (classification: South Central Semitic) and is closely related to Hebrew and Aramaic. ... A Hindu (archaic Hindoo), as per modern definition is an adherent of philosophies and scriptures of Hinduism, the predominant religious, philosophical and cultural system of the Indian subcontinent and the island of Bali. ... For other meanings of Inca, see Inca (disambiguation). ... Latin was the language originally spoken in the region around Rome called Latium. ...

References

Hummel, C. A., et al., 1994, AJ, 107, 1859

Isaac Asimov on Capella's Comparative Luminosity

Isaac Asimov used a parsec to measure distances of stars from the Earth. A parsec is equal to 19,150,000,000,000 miles. The closest of all stars is [[Alpha Centauri], a distance of 1.3 parsecs from us. Capella is 14 parsecs distant from the Earth, or more than 10 times farther away than Alpha Centauri. Capella and Alpha Centauri appear equally bright in appearance, with the former having a magnitude of 0.2 and the latter 0.1, respectively. Asimov reminds us that the lower the magnitude the brighter the star. So each unit by which magnitude is decreased is equal to a multiplication of 2.52 in brightness. The intensity of light decreases as the square of the distance. So the light of Capella has had an opportunity to diminish by 10 X 10 or 100 times more than Alpha Centauri. Remembering that Capella appears to the naked eye viewer to be as bright as Alpha Centauri, the star must be 100 times as bright in reality. Isaac Asimov, photographed by Jay Kay Klein Dr. Isaac Asimov (c. ... Earth is the third planet from the Sun. ... In science, a magnitude is the numerical size of something: see orders of magnitude. ... The Pleiades star cluster A star is a massive body of plasma in outer space that is currently producing or has produced energy through nuclear fusion. ... Brightness is an attribute of visual perception in which a source appears to emit a given amount of light. ... In physics, intensity is a measure of the time-averaged energy flux. ... Prism splitting light Light is electromagnetic radiation with a wavelength that is visible to the eye (visible light) or, in a technical or scientific context, electromagnetic radiation of any wavelength. ...

The apparent magnitude of a star is the actual brightness it appears to us as observers. For Alpha Centauri this is 0.1 and for Capella 0.2. Asimov explains that the absolute magnitude is measured as the star's brightness as it would appear at a distance from Earth of 10 parsecs. For Alpha Centauri the absolute magnitude would be 4.8 and for Capella -0.6. Earth's Sun is approximately the same absolute magnitude of Alpha Centauri or 4.8. Both the Sun and Alpha Centauri are considered to be no more than average stars, nothing special. The Sun is the spectral type G2V yellow star at the center of Earths solar system. ...

Asimov proposes the following simple equation: M = m + 5 - 5 log D

M is the star's absolute magnitude, m is the apparent magnitude and D is the distance in parsecs. The equation checks to show that from a standard distance of 10 parsecs the apparent magnitude is equal to the absolute magnitude. D is 10 and log 10 equals 1. The equation becomes M = m + 5 - 5, or M = m.

Of stars brighter than the Sun, Sirius with an absolute magnitude of 1.36, can be discerned at a distance of 100 parsecs. Capella at -0.6 can be seen from a distance of 260 parsecs. In terms of volume of space Sirius is visible through a volume 600 times while Capella is seen through a volume of more than 2000 times as great as that through which the Sun can be seen. Sirius (α CMa / α Canis Majoris / Alpha Canis Majoris) is the brightest star in the nighttime sky, with a visual apparent magnitude of −1. ... Volume, also called capacity, is a quantification of how much space an object occupies. ...

Capella is not nearly the most luminous of stars. Of stars visible to the naked eye Rigel is perhaps the most luminous. Its absolute magnitude is -5.8. This makes it 20,000 times as bright as the Sun and 100 times as luminous as Capella. Rigel can be observed by the naked eye over a range of 1/5 the width of the Milky Way Galaxy or a distance of 2900 parsecs in any direction. Rigel (pronounced ) (β Orionis) is the brightest star in the constellation Orion and the seventh brightest star in the sky, with visual magnitude 0. ... Note: This article contains special characters. ... NGC 4414, a typical spiral galaxy in the constellation Coma Berenices, is about 56,000 light years in diameter and approximately 60 million light years distant. ...

Reference

Fact and Fancy {Intriguing Speculations on the Possibilities of Science} by Isaac Asimov, Discus/Avon Books, March 1972, pages 152-155.