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PHOTOMETRY AND SPECTRUMCOPY STAR

The human curiosity of the universe is always increasing from time-to-time. Humans not only follow the motion and appearance of celestial bodies, but also try to know the nature of the heavenly bodies.With the support of the development of science, especially physics and mathematics, humans trying to find out how the heavenly bodies are formed and developed From here develops Astrophysics or Star Physics, namely the application of physics to the universe.To study celestial bodies, the information received is only a shaft of lightLight (electromagnetic waves)The emission of electromagnetic waves can be divided into several types, depending on their wavelength (l)1. Radio waves, with l between several millimeters to 20 meters.2. Infrared wave emitting, with l about 7500 Å to about 1 mm (1 Å = 1 Angstrom = 10-8 cm).3. Optical waves or visible jets with  about 3 800Å to 7 500 ÅThe optical wavelength is divided into various colors red l: 6 300 - 7 500 Å red orange l: 6 000 - 6 300 Å orange l: 5 900 - 6 000 Å yellow l: 5 700 - 5 900 Å yellow green l: 5 500 - 5 700 Å green l: 5 100 - 5 500 Å blue green l: 4 800 - 5 100 Å blue l: 4 500 - 4 800 Å blue purple l: 4 200 - 4 500 Å lilac l: 3 800 - 4 200 Å

4. The emission of ultraviolet waves, X-rays and g-rays has  <3 500 Å
 The picture above shows the exposure of electromagnetic waves from short wavelengths to long wavelengths. The image shows also how narrow the visible wavelength region of light is. If we only rely on visible light then the information provided by outer space is also limited to a fairly narrow area with all the limitations and constraints that may occur naturally. Therefore human beings are trying to uncover
 the secret of the sky by widening the window area of information with tools that are able to detect these areas.
    balloon radio telescope, satellite
                                                           optical telescopes
                                                                         satellite balloon, satellite



Reach "vehicle" to bring the detector

By observing the emission of electromagnetic waves we can learn some things that is,
 The direction of the jet. From observation we can observe the location and motion of the object that radiates it
The quantity of jets. We can measure strong or brightness of the beam
 The quality of the jet. In this case we can study the color, spectrum and polarisasinya
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