An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 285 Search : if
109P/Swift-Tuttle
  ۱۰۹P/سوییفت-تاتل   
109P/Swift-Tuttle

Fr.: 109P/Swift-Tuttle   

The largest → comet orbiting periodically around the → Sun. Its nucleus is about 26 km across and its orbital period 133 years. Comet Swift-Tuttle is the parent body of the → meteor shower called the → Perseids. The comet was discovered in July 1862, when it was apparently as bright as → Polaris in the night sky. The comet's reappearance was predictaed for 1992, when it was rediscovered by Japanese amateur astronomer Tsuruhiko Kiuchi. In 2126 it will be a bright naked-eye comet when it will come within about 23 million km of Earth, or about 60 times the distance from Earth to the Moon. Its nearest approach to Earth is expected in 3044, when the comet will come within 1.6 million kilometres of the Earth's surface.

Named after the American astronomers who independently discovered the comet in 1862, Lewis Swift (1820-1913) on July 16, and Horace Parnell Tuttle (1837-1923) on July 19.

accurate to n significant digits
  رشمند با n رقم ِ نشانار   
rašmand bâ n raqam-e nešânâr

Fr.: écrit avec n chiffres significatifs   

An expression specifying the number of meaningful digits used to express the value of a measured quantity. Same as accurate to n significant figures. For example, e = 2.71828 ... = 2.718 is rounded to four significant digits, and 2.72 to three significant digits. → accurate to n decimal places.

accurate; → significant; → digit.

ambipolar diffusion
  پخش ِ اوبا قطبی   
paxš-e ubâqotbi

Fr.: diffusion ambipolaire   

A physical process which allows a → molecular cloud to decouple from → interstellar magnetic field in order to undergo → gravitational collapse. A cloud of pure molecular gas would form stars very fast through collapse since neutral matter does not respond to the magnetic field. However, the magnetic field holds up a collapse because the ions present in the cloud collide with the neutrals and tie them to the field. The collapse can then only proceed if the magnetic field can be separated from the gas. In denser molecular cores the ionization degree decreases substantially and therefore neutrals and ions decouple.

ambipolar; → diffusion.

amplification
  دامنه‌دهی، دامنه‌گیری   
dâmane-dehi, dâmane-giri (#)

Fr.: amplification   

1) General: The act or result of amplifying, enlarging, or extending.
2) Physics: The process of increasing the magnitude of a variable quantity, especially the magnitude of voltage, power, or current, without altering any other quantity.

Verbal noun of → amplify.

amplification factor
  کروند ِ دامنه‌دهی   
karvand-e dâmane-dahi

Fr.: facteur d'amplification   

1) Electronics: The extent to which an → analogue → amplifier boosts the strength of a → signal. Also called → gain.
2) In → gravitational lensing, the ratio of the lensed brightness to unlensed brightness. This factor depends on the mass of the → lensing object and the closeness of the alignment between observer, lens, and source (→ impact parameter).

amplification; → factor.

amplifier
  دامنه‌ده   
dâmane-deh

Fr.: amplificateur   

Device for reproducing an electrical input at increased intensity.

Agent noun of → amplify.

amplify
  دامنه‌دادن، دامنه‌گرفتن   
dâmané dâdan, dâmané gereftan (#)

Fr.: amplifier   

General:To make larger, greater, or more powerful.
Physics:To increase the amplitude of an input signal.

From M.F. amplifier, from L. amplificare "to increase, augmant," from L. amplus "wide, large."

Dâmané, → amplitude; dâdan "to give" (Mid.Pers. dâdan "to give," O.Pers./Av. dā- "to give, grant, yield," dadāiti "he gives;" Skt. dadáti "he gives," Gk. didomi "I give," tithenai "to put, set, place;" L. dare "to give, offer;" Rus. delat "to do;" O.H.G. tuon, Ger. tun, O.E. don "to do"); gereftan "to take, seize, catch," (Mid.Pers. griftan, Av./O.Pers. grab- "to take, seize," cf. Skt. grah-, grabh- "to seize, take," graha "seizing, holding, perceiving," M.L.G. grabben "to grab," from P.Gmc. *grab, E. grab "to take or grasp suddenly;" PIE base *ghrebh- "to seize").

angular differential imaging (ADI)
  تصویرگری ِ دگرسانه‌ای ِ زاویه‌ای   
tasvigari-ye degarsâne-yi-ye zâviye-yi

Fr.: imagerie différentielle angulaire   

A high-contrast imaging technique that reduces minute temporal and spatial → seeing fluctuations and facilitates the detection of faint point sources, in close separation from their stars. It consists of the acquisition of a sequence of images with an → altazimuth mounting telescope while the instrument field derotator is switched off. This keeps the instrument and telescope optics aligned and allows the field of view to rotate with respect to the instrument. For each image, a reference → point spread function (PSF) is constructed from other appropriately selected images of the same sequence and subtracted to remove quasistatic PSF structure (Marois et al. 2006, ApJ 641, 556).

angular; → differential; → imaging.

anomalous redshift
  سرخ-کیب ِ ناسان   
sorx-kib-e nâsân

Fr.: décalage anormal vers le rouge   

The high redshift of a quasar which is seemingly physically associated with a galaxy of low redshift.

anomalous; → redshift.

antiferromagnetism
  پاد‌آهن‌مغنات‌مندی   
pâd-âhanmeqnâtmandi

Fr.: antiferromagnétisme   

A property possessed by some → metals, → alloys, and salts of transition elements in which there is a lack of → magnetic moment due to the antiparallel or spiral arrangement of atomic → magnetic moments.

anti- + → ferromagnetism.

Aquila Rift
  چاک ِ شاهین   
câk-e Šâhin

Fr.: Rift de l'Aigle   

A long, dark structure located close to the → Galactic plane and occupying an area between longitudes l ~15° and ~35° and latitudes b ± 10° in the constellations Aquila, Serpens, and eastern Ophiuchus. The Aquila Rift is a complex of dust and → molecular clouds making part of → Gould's Belt in the → Orion Arm. The mass of the molecular gas, derived from → carbon monoxide (CO) observations (Dame et al. 2001, ApJ 547, 792), is in the range ~ 1-3 x 105 → solar masses. A distance of ~260 pc has been estimated for the Aquila Rift, but it is uncertain. Recent Herschel observations have revealed a filamentary structure in the Aquila Rift and the presence of a population of → pre-stellar cores as well as → young stellar objects (André et al. 2010, A&A 518, L102; Bontemps et al. 2010, A&A 518, L85; Könyves et al. 2010, A&A 518, L106).

Aquila; → rift.

artifact
  دساچ   
dasâc

Fr.: objet fabriqué, artefact   

1) An object made by a human being, typically one of cultural or historical interest.
2) Something observed in a scientific investigation or experiment that is not naturally present but occurs as a result of the preparative or investigative procedure (OxfordDictionary.com).

From It. artefatto, from L. arte "by skill" (ablative of ars "→ art") + factum "thing made," from facere "to make, do," → -fy.

Dasâc "hand made," from das variant of dast, → hand, + sâc, variant of sâz-, sâxtan, → agree.

artificial
  ساختگی   
sâxtegi (#)

Fr.: artificiel   

Not occurring naturally; produced by man.

M.E., from O.Fr., from L. artificialis "belonging to art," from artificium "craftsmanship."

Sâxtegi "artificial," from sâxtan "to build, to make," → structure.

artificial horizon
  افق ِ ساختگی   
ofoq-e sâxtegi

Fr.: horizon artificiel   

A shallow flat vessel filled with → mercury or some other viscous → liquid used in special → sextant for measuring altitudes of celestial bodies at sea in the absence of a → visible horizon.

artificial; → horizon.

artificial language
  زبان ِ ساختگی   
zabân-e sâxtegi

Fr.: langue artificielle   

An artificially created language system for international communication or for a specific intellectual or scientific purpose. Examples include Esperanto, computer programing languages, → symbolic logic, and → tensor analysis.

artificial; → language.

artificial light
  نور ِ ساختگی   
nur-e sâxtegi

Fr.: lumière artificielle   

Any light other than that which proceeds from the heavenly bodies.

artificial; → light.

artificial satellite
  ماهواره   
mâhvâré (#)

Fr.: satellite artificiel   

A man-made equipment that orbits around Earth or a solar system body.

artificial; → satellite.

artificial star
  ستاره‌ی ِ ساختگی   
setâre-ye sâxtegi

Fr.: étoile artificielle   

In → adaptive optics, a point source created on the sky by means of a laser beam in order to correct for the → atmospheric turbulence. A laser tuned to the wavelength of 589 nm will excite sodium atoms at an altitude of ~ 100 km in the Earth's atmosphere, producing an artificial "star."

artificial; → star.

atomic diffusion
  پخش ِ اتمی   
paxš-e atomi

Fr.: diffusion atomique   

element diffusion.

atomic; → diffusion.

bifurcate
  ۱) دوگلیدن؛ ۲) دوگل   
1) dogalidan; 2) dogal

Fr.: 1) bifurquer; 2) à deux branches   

1) To divide into two branches.
2) Divided into two branches.

M.L. bifurcatus, from L. → bi- "two," + furca "pitchfork; fork used in cooking," of uncertain origin.

Dogalidan, from Gilaki dogal "fork, two-branched," cf. Tabari dekal, dokkal, doqâla, from do, → two, + gal, kal "branch, part," cf. Kurd. (Kurmanji) kar "part, piece," cognate with Pers. kârd "knife," (+ *niš-) nišgarda "cobbler's knife;" Mid.Pers. kârt "knife," karēnītan, karītan "to cut," (+ *fra-) fragard "chapter, section;" Av. karət- "to cut;" Proto-Iranian *kart- "to cut;" cf. Skt. kart- "to cut;" Gk. karpos "fruit;" L. carpere "to cut, divide, pluck;" PIE base *(s)ker- "to cut;" + -idan infinitive suffix. See also → shear.

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