Sentences with phrase «in apparent brightness»

For example, in dealing with the structural organization of the heavens, he assumed that all stars were equally bright, so that differences in apparent brightness are an index only of differences in distances.

The Sunyaev - Zel «dovich effect (SZE) causes a change in the apparent brightness of the CMB towards a cluster of galaxies or any other reservoir of hot plasma.

An interesting change in apparent brightness and to some degree form will result — what may be called a «here comes the sun» effect.

Not exact matches

We extract science by carefully modeling all the ways in which the spacecraft and the instruments themselves could have caused the apparent brightness of a planetary system to change over time... We are pretty sure we can trust our models of Spitzer down to about a part in 10,000; we are in uncharted territory as far as detector behavior is concerned.»

The apparent brightnesses of distant type Ia supernovae then reveal the distances of their galaxies, which in turn give the Hubble constant.

A few seconds before, and again a few seconds after the main occultation there were two further very short dips in the star's apparent brightness [7].

Although the explosion is unusually close, the supernova's light is attenuated by thick dust clouds in its galaxy, which may slightly reduce its apparent peak brightness.

One possible explanation for the color - blind advantage is that a reduction in color signals makes the differences in texture and brightness more apparent, so it's easier to see past color camouflage, says Melin.

Then, as with the Cepheids, he could compare that luminosity with the galaxy's apparent brightness to figure out its true place in deep space.

It ranges in brightness from about − 2.0 to 5.5 in apparent magnitude, but is not easily seen; its greatest angular separation from the Sun (greatest elongation) is only 28.3 ° (it can only be seen in twilight).

Astronomers measure the brightness of objects in the sky on a scale of apparent magnitude — the brighter the object, the greater the negative number; the dimmer, the greater the positive number.

Kepler continuously tracks more than 150,000 stars; when a planet passes in front of one of them, in a kind of mini eclipse known as a transit, the spacecraft registers a slight dip in the star's apparent brightness.

Because all the stars in the Small Magellanic Cloud have approximately the same distance to us, the observed relationship between apparent brightness and period implies that there is an equivalent relationship between absolute brightness and oscillation period.

By measuring about 2,400 Cepheid stars in 19 nearby galaxies and comparing the apparent brightness of both types of stars, they accurately determined the true brightness of the Type Ia supernovae.

In 1996, another group of astronomers using the Hubble Space Telescope discovered that they might have directly observed a companion to Proxima with the implied brightness of a brown dwarf and an apparent visual separation of only about half the Earth - Sun distance — 0.5 AU (Schultz et al, 1998).

[34] Alpha Centauri B at an apparent visual magnitude of 1.33 would be twenty - first in brightness if it could be seen independently of Alpha Centauri A.

Even though most of the visible radiation is concentrated in a few discrete emission lines, the total apparent brightness of the brightest is the equivalent of tens of thousands of solar luminosities.

Tucker Jones is discussing the lensing effect can cause galaxies to be magnified in apparent size and brightness by factors of more than 10.

When an input catalog is provided, the apparent brightness of each source needs to be specified in each filter; a future upgrade will allow spectral energy distributions to be specified instead.

Built - in crush is apparent, but shadow detail is much more satisfactory, as are brightness and contrast levels.

The gradient is more apparent with the brightness turned up high, and when reading at night in a dark room.

With auto - brightness enabled it keeps the light low enough the discoloration is almost unnoticeable; it's more apparent with brightness turned up high in a dark room.

Lockwood et al. 2006 http://adsabs.harvard.edu/abs/2006Icar..180..442L states: The apparent relationship between Neptune's brightness variation and the 11 - year solar cycle seen in cycles 21 22 (1972 1996) has apparently now faded away.

It works by sensing the increase in apparent microwave brightness temperature of the water surface caused by more foam as the wind increases.

This is at its most apparent in the form of extra brightness that occasionally appears down the left and right edges of dark HDR scenes.