An Etymological Dictionary of Astronomy and Astrophysics
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فرهنگ ریشه شناختی اخترشناسی-اخترفیزیک

M. Heydari-Malayeri    -    Paris Observatory

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Number of Results: 82 Search : plane
born-again planetary nebula
  میغ ِ سیاره‌ای ِ باز‌زاد   
miq-e sayâreyi-ye bâzzâd

Fr.: nébuleuse planétaire recyclée   

A → planetary nebula which is thought to have experienced a → very late thermal pulse (VLTP) when the central star (→ CSPN) was on the → white dwarf cooling track. The VLTP event occurs when the thermonuclear → hydrogen shell burning has built up a → shell of helium with the critical mass to ignite its → fusion into carbon and oxygen (→ helium shell burning). Since the → white dwarf envelope is shallow, the increase of pressure from this last helium shell flash leads to the ejection of newly processed material inside the old planetary nebula, leaving the stellar core intact. As the stellar envelope expands, its → effective temperature decreases and the star goes back to the → asymptotic giant branch (AGB) region in the → H-R diagram. The subsequent stellar evolution is fast and will return the star back to the → Post-AGB track in the H-R diagram: the envelope of the star contracts, its effective temperature and ionizing photon flux increase, and a new fast stellar wind develops (see, e.g. J. A. Toalá et al. 2015, ApJ 799, 67).

born; → again; → planetary; → nebula.

compact planetary nebula B[e] star (cPNB[e])
  ستاره‌یِ B[e]ی ِ میغ ِ سیاره‌ای ِ همپک   
setâre-ye B[e]-ye miq-e sayyâre-yi-ye hampak

Fr.: étoile de nébuleuse planétaire compacte   

A star whose spectrum shows striking similarities to → B[e] stars and is evolving into a → planetary nebula (→ preplanetary nebula).

compact; → planetary; → nebula; → B[e] star.

dwarf planet
  سیاره‌ی ِ کوتوله   
sayyâre-ye kutulé (#)

Fr.: planète naine   

A new category of → astronomical objects in the → solar system introduced in a resolution by the 26th General Assembly of the → International Astronomical Union (IAU) on August 24, 2006. The characterizing properties are as follows: 1) It is in orbit around the Sun; 2) It has sufficient mass for its self-gravity to overcome rigid body forces so that it assumes a → hydrostatic equilibrium (nearly round) shape; 3) It has not "cleared the neighbourhood" around its orbit; and 4) It is not a → satellite of a → planet, or other non-stellar body. The property 3 reclassified → Pluto from a planet to a dwarf planet because it has not cleared the neighborhood of its orbit (the → Kuiper Belt). The largest known dwarf planets are: → Eris, → Pluto, → Ceres, → Makemake, and → 2015 RR245.

dwarf; → planet.

ecliptic plane
  هامن هورپهی   
hâmon-e hurpehi

Fr.: plan de l'écliptique   

The plane of Earth's orbit around the Sun.

ecliptic, → plane.

Ecliptic Plane Input Catalogue (EPIC)
  کاتالوگ ِ درداد ِ هامن ِ هورپهی   
kâtâlog-e dardâdâ-e hâmon-e hurpehi

Fr.: catalogue d'entrée du plan de l'écliptique   

A catalog of fields along the → ecliptic observed by the → K2 mission. The catalog is hosted at the → Mikulski Archive for Space Telescopes (MAST).

ecliptic; → plane; → input; → catalogue.

equator plane
  هامن ِ هموگاری   
hâmon-e hamugâri

Fr.: plan équatorial   

An imaginary plane → perpendicular to the → axis of a → sphere dividing the sphere into two congruent parts.

equator; → plane.

equatorial plane
  هامن ِ هموگاری   
hâmon-e hamugâri

Fr.: plan équatorial   

The plane containing a celestial object's equator.

equatorial; → plane.

exoplanet
  برون‌سیاره   
borun-sayyâreh

Fr.: exoplanète   

Same as → extrasolar planet.

exo- + → planet.

exoplanetary
  برون‌سیاره‌ای   
borun-sayyâre-yi

Fr.: exoplanétaire   

Of, relating to, or resembling an → exoplanet or exoplanets.

exoplanet; → -ary.

exoplanetary system
  راژمان ِ برون‌سیاره‌ای   
râſmân-e borun-sayyâre-yi

Fr.: système exoplanétaire   

A → planetary system consisting of → exoplanets orbiting a star other than Sun.

exoplanetary; → system.

extrasolar planet
  سیاره‌ی ِ اُسترخورشیدی   
sayyâre-ye ostarxoršidi

Fr.: planète extrasolaire   

A planet which belongs to a star other than → Sun, and therefore does not belong to our → solar system; same as → exoplanet.

extrasolar; → planet.

focal plane
  هامن ِ کانونی   
hâmon-e kânuni

Fr.: plan focal   

A plane at right angles to the principal axis of a lens or mirror on which the best image is formed.

focal; → plane.

galactic plane
  هامن ِ کهکشان   
hâmon-e kahkešân

Fr.: plan galactique   

The plane in which the → disk of a → spiral galaxy, such as our → Milky Way, lies.

galactic; → plane.

giant planet
  سیاره‌ی ِ غولپیکر   
sayyâre-ye qulpeykar (#)

Fr.: planète géante   

A planet much more massive than Earth. The solar system has four giant planets: → Jupiter, → Saturn, → Uranus, and → Neptune.

giant; → planet.

High Accuracy Radial velocity Planet Searcher (HARPS)
  هارپس   
HARPS

Fr.: HARPS   

A high-precision echelle spectrograph built for exoplanet findings and installed on the ESO's 3.6m telescope at La Silla Observatory in Chile. The first light was achieved in February 2003. HARPS has discovered dozens of exoplanets, making it the most successful planet finder behind the Kepler space observatory. HARPS can detect movements as small as 0.97 m s-1 (3.5 km h-1), with an effective precision of the order of 30 cm s-1, and a → resolving power of 120,000 (Mayor et al., 2003, ESO Messengar 114, 20).

high; → accuracy; → radial; → velocity; → planet; → search; → -er.

image plane
  هامن ِ تصویر   
hâmon-e tasvir

Fr.: plan d'image   

The plane in which is formed an image produced by an → optical system.

image; → plane.

inferior planet
  سیاره‌ی ِ زیرین   
sayyâre-ye zirin (#)

Fr.: planète inférieure   

A planet that orbits between the Earth and the Sun. Mercury and Venus are the only two inferior planets in the Solar System.

inferior; → planète.

inner planets
  سیاره‌های ِ درونی   
sayârehâ-ye daruni (#)

Fr.: planètes internes   

The planets Mercury, Venus, Earth and Mars collectively. T hey are also known as the terrestrial planets.

inner; → planet.

interplanetary coronal mass ejections (ICME)
  اشانش ِ اندرسیاره‌ای ِ جرم از تاج   
ešâneš-e andarsayyâreyi-ye jerm az tâj

Fr.: éjection de masse coronale interplanétaire   

An → interplanetary manifestation of a → coronal mass ejection.

interplanetary; → coronal; → mass; → ejection.

interplanetary dust
  غبار ِ اندرسیاره‌ای   
qobâr-e andarsayyâreyi

Fr.: poussière interplanétaire   

Particles of dust in the → interplanetary medium. They are left-overs from the beginning of the solar system or from other sources such as sublimating comets. Their existence was first deduced from observations of → zodiacal light.

interplanetary; → dust.

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