Oort Constants

Oort Constants

The Oort Constants, named after Jan Oort, are empirically measurable constants relating to the sun's distance from and motion relative to the galactic centre.

::A=frac{1}{2}(frac{V_{o{R_{o-frac{dv}{dr})

::B=-frac{1}{2}(frac{V_{o{R_{o+frac{dv}{dr})

A = 14.82 ± 0.84 km/(kpc·s)

B = −12.37 ± 0.64 km/(kpc·s)

V_{o} is the orbital velocity of the Sun, and the R_{o} is Sun's distance form the centre of the Galaxy.

reference: http://astroprofspage.com/archives/75

reference: M. Feast and P. Whitelock, Monthly Notices of the Royal Astronomical Society, 291, 683-693 (1997).

Further reading

*http://scienceworld.wolfram.com/astronomy/OortConstants.html


Wikimedia Foundation. 2010.

Игры ⚽ Поможем написать курсовую

Look at other dictionaries:

  • Oort constants — The Oort constants (discovered by Jan Oort) A and B are empirically derived parameters that characterize the local rotational properties of our galaxy, the Milky Way, in the following manner: where V0 and R0 are the rotational velocity and… …   Wikipedia

  • Jan Oort — Born 28 April 1900(1900 04 28) Franeker, Friesland …   Wikipedia

  • Milky Way — This article is about the galaxy. For other uses, see Milky Way (disambiguation). Milky Way galaxy Image of the Milky Way s Galactic Center in the night sky above Paranal Observatory Observation data …   Wikipedia

  • Постоянные Оорта — Постоянные Оорта  Две эмпирических величины, которые содержатся в математических соотношениях голландского астронома Яна Оорта, определяющих лучевую скорость и собственное движение звезд на их орбитах вокруг центра Галактики, которые… …   Википедия

  • Постоянная галактической структуры Оорта — Две эмпирических величины, которые содержатся в математических соотношениях голландского астронома Яна Оорта, определяющих лучевую скорость и собственное движение звезд на их орбитах вокруг центра Галактики, которые считаются круговыми. Выражения …   Википедия

  • Astronomical unit — This article is about unit of length. For the full system of units, see Astronomical system of units. 1 astronomical unit = SI units 149.60×10^6 km 149.60×10^9 m Astronomical units 4.8481 …   Wikipedia

  • cosmos — /koz meuhs, mohs/, n., pl. cosmos, cosmoses for 2, 4. 1. the world or universe regarded as an orderly, harmonious system. 2. a complete, orderly, harmonious system. 3. order; harmony. 4. any composite plant of the genus Cosmos, of tropical… …   Universalium

  • Orders of magnitude (mass) — Iron weights up to 50 kilograms depicted in Dictionnaire encyclopédique de l épicerie et des industries annexes. To help compare different orders of magnitude, the following list describes various mass levels between 10−36 kg and 1060 kg …   Wikipedia

  • Physical Sciences — ▪ 2009 Introduction Scientists discovered a new family of superconducting materials and obtained unique images of individual hydrogen atoms and of a multiple exoplanet system. Europe completed the Large Hadron Collider, and China and India took… …   Universalium

  • Light-year — For other uses, see Light year (disambiguation). Image showing the scale of a light year (outer shell) and a light month (inner shell) surrounding the Sun compared to Comet 1910 A1 s orbit (yellow line) and Comet Hyakutake s orbit (orange line).… …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”