Misplaced Pages

#533466

35-473: Zeta Aquilae's two components can be designated Zeta Aquilae A (officially named Okab / ˈ oʊ k æ b / , the traditional name for the system) and B. Zeta Aquilae has a number of companions listed and together they are designated WDS J19054+1352. As the primary star of this group, Zeta Aquilae also bears the designation WDS J19054+1352A. The companions are then designated WDS J19054+1352B, C, D and E. ζ Aquilae , Latinised to Zeta Aquilae ,

70-507: A stellar classification of A0 Vn, with the luminosity class 'V' indicating is a main sequence star that is generating energy through the nuclear fusion of hydrogen at its core. It has more than double the mass and twice the radius of the Sun , and is radiating more than 39 times the Sun's luminosity . The effective temperature of the star's outer envelope is about 9620 K, which gives it

105-407: A 360 degree circle, east has azimuth 90°, south 180°, and west 270°. There are exceptions: some navigation systems use south as the reference vector. Any direction can be the reference vector, as long as it is clearly defined. Quite commonly, azimuths or compass bearings are stated in a system in which either north or south can be the zero, and the angle may be measured clockwise or anticlockwise from

140-497: A central point are preserved. Some navigation systems use south as the reference plane. However, any direction can serve as the plane of reference, as long as it is clearly defined for everyone using that system. If, instead of measuring from and along the horizon, the angles are measured from and along the celestial equator , the angles are called right ascension if referenced to the Vernal Equinox, or hour angle if referenced to

175-419: A horizontal angle measured clockwise from a north base line or meridian . Azimuth has also been more generally defined as a horizontal angle measured clockwise from any fixed reference plane or easily established base direction line. Today, the reference plane for an azimuth is typically true north , measured as a 0° azimuth, though other angular units ( grad , mil ) can be used. Moving clockwise on

210-741: A playful element of punning. Such names could be a cover for humble social origins. The title of the " Wilhelmus ", national anthem of the Netherlands , preserves a Latinised form of the name of William the Silent . In English, place names often appear in Latinised form. This is a result of many early text books mentioning the places being written in Latin. Because of this, the English language often uses Latinised forms of foreign place names instead of anglicised forms or

245-474: A telluric standard star. That is, the spectrum of this star is used to correct for telluric contamination from the Earth's atmosphere when examining the spectra of neighboring stars. Observation of this star in the infrared band during the 2MASS survey appeared to reveal excess emission . However, the distribution of this emission couldn't be readily explained by a conjectured disk of circumstellar dust . Instead,

280-571: Is also considered to be a co-moving companion with a mass of 0.14  M ☉ , at a projected separation of 38,000 AU from the primary. The Washington Double Star Catalog lists a second 12th magnitude star at 160" (WDS J19054+1352C) plus an 11th magnitude star separated by 200" (WDS J19054+1352D). The Catalog of Components of Double and Multiple Stars lists the two 12th magnitude companions at 6.5" and 160". Latinisation of names Latinisation (or Latinization ) of names , also known as onomastic Latinisation ,

315-399: Is called the azimuth. When used as a celestial coordinate , the azimuth is the horizontal direction of a star or other astronomical object in the sky . The star is the point of interest, the reference plane is the local area (e.g. a circular area with a 5 km radius at sea level ) around an observer on Earth's surface , and the reference vector points to true north . The azimuth

350-408: Is east or west. The directions are chosen so that the angle, stated between them, is positive, between zero and 90 degrees. If the bearing happens to be exactly in the direction of one of the cardinal points , a different notation, e.g. "due east", is used instead. We are standing at latitude φ 1 {\displaystyle \varphi _{1}} , longitude zero; we want to find

385-564: Is marking the left borderline of the enclosure, consisting of Zeta Aquilae; Delta , Lambda , Mu , Omicron and 112 Herculis ; Theta¹ and Eta Serpentis ; Nu Ophiuchi , Xi Serpentis and Eta Ophiuchi . Consequently, the Chinese name for Zeta Aquilae itself is 天市左垣六 ( Tiān Shì Zuǒ Yuán liù , English: the Sixth Star of Left Wall of Heavenly Market Enclosure ), representing the state mentioned above. The primary, designated component A, has

SECTION 10

#1732876555534

420-413: Is the horizontal angle from a cardinal direction , most commonly north , in a local or observer-centric spherical coordinate system . Mathematically, the relative position vector from an observer ( origin ) to a point of interest is projected perpendicularly onto a reference plane (the horizontal plane ); the angle between the projected vector and a reference vector on the reference plane

455-618: Is the angle between the north vector and the star's vector on the horizontal plane . Azimuth is usually measured in degrees (°), in the positive range 0° to 360° or in the signed range -180° to +180°. The concept is used in navigation , astronomy , engineering , mapping , mining , and ballistics . The word azimuth is used in all European languages today. It originates from medieval Arabic السموت ( al-sumūt , pronounced as-sumūt ), meaning "the directions" (plural of Arabic السمت al-samt = "the direction"). The Arabic word entered late medieval Latin in an astronomy context and in particular in

490-468: Is the angle measured at our viewpoint by a theodolite whose axis is perpendicular to the surface of the spheroid; geodetic azimuth (or geodesic azimuth ) is the angle between north and the ellipsoidal geodesic (the shortest path on the surface of the spheroid from our viewpoint to Point 2). The difference is usually negligible: less than 0.03 arc second for distances less than 100 km. Normal-section azimuth can be calculated as follows: where f

525-662: Is the binary's Bayer designation . The designations of the two components as Zeta Aquilae A and B derive from the convention used by the Washington Multiplicity Catalog (WMC) for multiple star systems , and adopted by the International Astronomical Union (IAU). WDS J19054+1352 is the entry of the wider system of which Zeta Aquilae is a member in the Washington Double Star Catalog . Zeta and Epsilon Aquilae together bore

560-399: Is the flattening and e the eccentricity for the chosen spheroid (e.g., 1 ⁄ 298.257 223 563 for WGS84 ). If φ 1 = 0 then To calculate the azimuth of the Sun or a star given its declination and hour angle at a specific location, modify the formula for a spherical Earth. Replace φ 2 with declination and longitude difference with hour angle, and change the sign (since

595-476: Is the practice of rendering a non - Latin name in a modern Latin style. It is commonly found with historical proper names , including personal names and toponyms , and in the standard binomial nomenclature of the life sciences. It goes further than romanisation , which is the transliteration of a word to the Latin alphabet from another script (e.g. Cyrillic ). For authors writing in Latin, this change allows

630-420: Is the reason why the X and Y axis in the above formula are swapped. If the azimuth becomes negative, one can always add 360°. The formula in radians would be slightly easier: Note the swapped ( x , y ) {\displaystyle (x,y)} in contrast to the normal ( y , x ) {\displaystyle (y,x)} atan2 input order. The opposite problem occurs when

665-552: The Calendarium of Al Achsasi Al Mouakket , Zeta Aquilae was designated Dzeneb al Tair (from the Arabic ذنب الطائر ðanab aṭ-ṭā’ir ), which was translated into Latin as Cauda (Vulturis) Volantis , meaning the eagle's tail . In Chinese , 天市左垣 ( Tiān Shì Zuǒ Yuán ), meaning Left Wall of Heavenly Market Enclosure , refers to an asterism which represents eleven old states in China and

700-526: The celestial meridian . In mathematics, the azimuth angle of a point in cylindrical coordinates or spherical coordinates is the anticlockwise angle between the positive x -axis and the projection of the vector onto the xy - plane . A special case of an azimuth angle is the angle in polar coordinates of the component of the vector in the xy -plane, although this angle is normally measured in radians rather than degrees and denoted by θ rather than φ . For magnetic tape drives , azimuth refers to

735-411: The horizontal coordinate system , used in celestial navigation , azimuth is one of the two coordinates . The other is altitude , sometimes called elevation above the horizon. It is also used for satellite dish installation (see also: sat finder ). In modern astronomy azimuth is nearly always measured from the north. In land navigation, azimuth is usually denoted alpha , α , and defined as

SECTION 20

#1732876555534

770-467: The azimuth from our viewpoint to Point 2 at latitude φ 2 {\displaystyle \varphi _{2}} , longitude L (positive eastward). We can get a fair approximation by assuming the Earth is a sphere, in which case the azimuth α is given by A better approximation assumes the Earth is a slightly-squashed sphere (an oblate spheroid ); azimuth then has at least two very slightly different meanings. Normal-section azimuth

805-601: The component Zeta Aquilae A on 1 June 2018 and it is now so included in the List of IAU-approved Star Names. Epsilon and Zeta Aquilae also bore the Mandarin names Woo / ˈ w uː / and Yuë / ˈ juː eɪ / , derived from and representing the old states Wú (吳) (located at the mouth of the Yangtze River ) and Yuè (越) (in Zhejiang province). In the catalogue of stars in

840-408: The coordinates ( X 1 , Y 1 ) of one point, the distance D , and the azimuth α to another point ( X 2 , Y 2 ) are known, one can calculate its coordinates: This is typically used in triangulation and azimuth identification (AzID), especially in radar applications. There is a wide variety of azimuthal map projections . They all have the property that directions (the azimuths) from

875-451: The detection was later ascribed to errors caused by saturation of the near-infrared detectors. The primary forms a binary star system with component B. This is a magnitude 12.0 star at an angular separation of 7.20 ″ along a position angle of 46°, as of 2009. The pair have a projected separation of 185.1  AU . The secondary has an estimated mass equal to one half the mass of the Sun. The 16th magnitude star WDS J19054+1352E

910-773: The early 19th century, Europe had largely abandoned Latin as a scholarly language (most scientific studies and scholarly publications are printed in English), but a variety of fields still use Latin terminology as the norm. By tradition, it is still common in some fields to name new discoveries in Latin. And because Western science became dominant during the 18th and 19th centuries, the use of Latin names in many scholarly fields has gained worldwide acceptance, at least when European languages are being used for communication. Azimuth An azimuth ( / ˈ æ z ə m ə θ / ; from Arabic : اَلسُّمُوت , romanized :  as-sumūt , lit.   'the directions')

945-414: The hour angle is positive westward instead of east). The cartographical azimuth or grid azimuth (in decimal degrees) can be calculated when the coordinates of 2 points are known in a flat plane ( cartographical coordinates ): Remark that the reference axes are swapped relative to the (counterclockwise) mathematical polar coordinate system and that the azimuth is clockwise relative to the north. This

980-501: The name to function grammatically in a sentence through declension . In a scientific context, the main purpose of Latinisation may be to produce a name which is internationally consistent. Latinisation may be carried out by: Humanist names, assumed by Renaissance humanists , were largely Latinised names, though in some cases (e.g. Melanchthon ) they invoked Ancient Greek . Latinisation in humanist names may consist of translation from vernacular European languages, sometimes involving

1015-677: The original names. Examples of Latinised names for countries or regions are: Latinisation is a common practice for scientific names . For example, Livistona , the name of a genus of palm trees, is a Latinisation of Livingstone . During the age of the Roman Empire , translation of names into Latin (in the West) or Greek (in the East) was common. Additionally, Latinised versions of Greek substantives , particularly proper nouns , could easily be declined by Latin speakers with minimal modification of

1050-627: The original word. During the medieval period , after the Empire collapsed in Western Europe , the main bastion of scholarship was the Roman Catholic Church , for which Latin was the primary written language. In the early medieval period, most European scholars were priests and most educated people spoke Latin, and as a result, Latin became firmly established as the scholarly language for the West. By

1085-452: The star to assume an oblate spheroidal shape. The equatorial radius is about 30.7% greater than the polar radius. Because of the Doppler effect , this rapid rotation makes the absorption lines in the star's spectrum broaden and smear out, as indicated by the 'n' suffix in the stellar class. It likely exhibits differential rotation along different latitudes. Astronomers use Zeta Aquilae as

Zeta Aquilae - Misplaced Pages Continue

1120-461: The traditional name Deneb el Okab , from an Arabic term ذنب العقاب Dhanab al-ʽuqāb "the tail of the eagle", which they mark ( Aquila is Latin for 'eagle'). 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 Okab for

1155-613: The use of the Arabic version of the astrolabe astronomy instrument. Its first recorded use in English is in the 1390s in Geoffrey Chaucer 's Treatise on the Astrolabe . The first known record in any Western language is in Spanish in the 1270s in an astronomy book that was largely derived from Arabic sources, the Libros del saber de astronomía commissioned by King Alfonso X of Castile. In

1190-409: The white hue typical of A-type stars . The estimated age of this star is 50–150 million years. The primary is rotating nearly edge-on, with an inclination (with respect to the plane of sky) of 85°. It is rotating rapidly, with a projected rotational velocity of 317 km s giving a lower bound on the azimuthal velocity along the equator. As a result, it has a pronounced equatorial bulge, causing

1225-402: The zero. For example, a bearing might be described as "(from) south, (turn) thirty degrees (toward the) east" (the words in brackets are usually omitted), abbreviated "S30°E", which is the bearing 30 degrees in the eastward direction from south, i.e. the bearing 150 degrees clockwise from north. The reference direction, stated first, is always north or south, and the turning direction, stated last,

#533466