Upload
hera
View
50
Download
0
Tags:
Embed Size (px)
DESCRIPTION
Polaris. The North Star. Who discovered Polaris?. Polaris was discovered by astronomer William Herschel in the year 1780. Apparent and Absolute Magnitude. - PowerPoint PPT Presentation
Citation preview
The North StarPolaris
Who discovered Polaris?
Polaris was discovered by astronomer William Herschel in the year 1780.
Apparent and Absolute Magnitude Apparent magnitude
of a celestial body is a measure of its brightness as seen by an observer on Earth, adjusted to the value it would have in the absence of the atmosphere
Polaris has an apparent magnitude of 1.97v
Absolute magnitude is the measure of a celestial object's intrinsic brightness
Its absolute magnitude is -3.64
Distance From EarthHow far away is Polaris?
Astronomers estimate Polaris’ distance at 430 light-years
Which means itmust be pretty bright!
What color is Polaris?
white and slightly yellowish
Polaris
How hot is it on Polaris?Surface temperature
The surface temperature of Polaris is 7200 degrees Kelvin. That is the equivalent of 12500.33 degrees Fahrenheit. It is also
comparable to 6926.85 Celcius
Where can I find Polaris?
Polaris is located in the constellation of Ursa Minor, the Little Bear.
The best way to find your way to Polaris is to use the so-called “Pointer” stars in the bowl of the Big Dipper, Dubhe and Merak. Just draw a line, between these two stars and extend it out about 5 times, and you eventually will arrive in the vicinity of Polaris.
What kind of star is Polaris?
Polaris is a hot, blue bright giant star. More specifically it is a Cepheid Variable star, which means that it is a pulsating variable star that pulsates with a period of almost four days.