method of small perturbations
raveš-e parturešhâ-ye kucak
Fr.: méthode des petites perturbations
The linearization of the appropriate equations governing a system by the assumption of a steady state, with departures from that steady state limited to small perturbations. Also called perturbation method.
kucak (#), kam (#)
M.E. smale; O.E. smæl "slender, narrow, small;" cf. Dan., Swed., M.Du., Du., O.H.G. smal, O.Fris. smel, Ger. schmal "narrow," Goth. smalista "smallest."
Kucak "small;" Mid.Pers. kucak "small,"
related to kutâh "short, small, little," kudak "child, infant,"
kutulé, → dwarf; Mid.Pers. kôtâh "low," kôtak
"small, young; baby;" Av. kutaka- "little, small."
haft xâharân, camce-ye kucak
Fr.: Petite Ourse
Same as → Little Dipper.
Small Magellanic Cloud (SMC)
Abr-e Kucak-e Magellan (#)
Fr.: Petit Nuage de Magellan
An irregular galaxy, the smaller of the two Magellanic Clouds that are satellites of our own Galaxy, lying in the southern constellation → Tucana. The SMC is about 10,000 light-years in diameter and some 200,000 light-years away. It has a visible mass of about 1/50-th that of our Galaxy and 1/10-th of that of the LMC. Its heavy element content is about a factor 5 smaller than that of the Galaxy. The SMC is the third-nearest external galaxy after the → Sagittarius Dwarf Elliptical Galaxy and the → Large Magellanic Cloud (LMC).
→ small; Magellanic named in honor of Ferdinand Magellan, the Portuguese navigator (c 1480-1521), who undertook the first voyage around the world. The two Clouds were first described by Magellan's chronicler Pigafetta, after leaving the Strait of Magellan in 1520; → cloud.
small solar system body
jesm-e kucak-e râžmân-e xoršidi
Fr.: petit corps du système solaire
A term introduced by the → International Astronomical Union (August 2006) to name the → solar system bodies other than → planets and → dwarf planets. Small solar system bodies include → asteroids, → comets, and → meteoroids.
TRAnsiting Planets and PlanetesImals Small Telescope (TRAPPIST)
A Belgian facility devoted to the detection and characterization of → exoplanets and to the study of → comets (→ transiting planet) and other → small solar system bodies. It consists of two 60 cm robotic telescopes located at the → European Southern Observatory, → La Silla, in Chile and at Oukaïmden Observatory in Marroco.
very small grain (VSG)
dâne-ye besyâr kucak
Fr.: très petit grain
A special type of carbonaceous → interstellar dust grains with a size ranging from 10 to 150 Å and consisting of tens to hundreds of atoms. In contrast to → big grains, VSGs are not in → thermal equilibrium. They can be heated to very high temperatures (~ 1000 K) by the absorption of a single photon. It is thought that VSGs are clusters of → PAH.