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Scintillation or twinkling are generic terms for rapid variations in apparent brightness or color of a distant luminous object viewed through a medium, most commonly the atmosphere (atmospheric scintillation).
If the object lies outside the earth's atmosphere, as in the case of stars and planets, the phenomenon is termed astronomical scintillation; if the luminous source lies within the atmosphere, the phenomenon is termed terrestrial scintillation.
As one of the three principal factors governing astronomical seeing, atmospheric scintillation is defined as variations in illuminance only, and so twinkling does not cause blurring of astronomical images. It is clearly established that almost all scintillation effects are caused by anomalous refraction caused by small-scale fluctuations in air density usually related to temperature gradients. Normal wind motion transporting such fluctuations across the observer's line of sight produces the irregular changes in intensity characteristic of scintillation. The primary cause of such small-scale fluctuations is turbulent mixing of air with different temperatures.
Scintillation effects are always much more pronounced near the horizon than near the zenith (straight up). Parcels of air with sizes of the order of only centimeters to decimeters are believed to produce most of the scintillatory irregularities in the atmosphere. Atmospheric scintillation is measured quantitatively using a scintillometer.
Scintillation effects are reduced by using a larger receiver aperture. This effect is known as aperture averaging.
Sirius is the brightest star in the night sky.
Sirius A is about twice as massive as the Sun and has an absolute visual magnitude of 1.42. It is 25 times more luminous than the Sun[8] but has a significantly lower luminosity than other bright stars such as Canopus or Rigel.
Originally posted by Regenstorm
Those that think that it is a star or planet forget the many, many lights below. Planets and stars don't shine that bright that you can catch them with a camera among those bright lights around!
Originally posted by ugie1028
I thought it was a star too, but i lived out here all my life, and i never saw a star do that before in the NYC/NJ area.
Originally posted by ugie1028
reply to post by Mr_skepticc
Ill figure it out tonight. since this was just yesterday, it should show up again right? we have clear skies, so i wont be blocked by cloud cover.
If its there, its there, if not, then well... what WAS it then...
But we, or i wont know until 7-7:30.