By Brian D. Warner
Tools for beginner astronomers who desire to transcend CCD imaging and step into ‘serious’ technological know-how. The textual content bargains ideas for accumulating, reading, and publishing info, and describes joint initiatives within which amateurs and scholars can participate. Readers discover ways to realize and steer clear of universal blunders in accumulating photometry information, with specified examples for research. comprises stories of accessible software program, with reveal photographs and priceless tips.
Read Online or Download A Practical Guide to Lightcurve Photometry and Analysis (The Patrick Moore Practical Astronomy Series) PDF
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Additional resources for A Practical Guide to Lightcurve Photometry and Analysis (The Patrick Moore Practical Astronomy Series)
Therefore, to compute the true exoatmospheric magnitude of the star correctly – the magnitude as seen outside the Earth’s atmosphere – one must also determine and apply the second-order extinction. Second-order extinction is defined as units of magnitudes/air mass/unit of color index. The color index is the difference in the magnitudes of an object when measured in two colors, usually B and V. 0. Second-order terms involving (V–R) or (V–I) are usually considered insignificant in all but the most critical cases.
You can get an approximate error of any given measurement by using 1/SNR – assuming the SNR value is valid. However, this is in terms of flux and not magnitudes. 1 gives some examples of converting SNR to magnitudes. 1 Errors in magnitudes for given SNR values. Be careful about taking these values literally by assuming that SNR alone indicates the data errors. Other errors, including systematic, influence the true error. 4 What Is an Acceptable SNR? 1 m, an SNR of 100 becomes important; you don’t want the noise to be a significant portion of the lightcurve.
One is used to block light from shorter wavelengths and the Balmer discontinuity. The U band extends to shorter wavelengths than B. The original filter that defined the system actually passes a fair amount of red light. This red-leak must be filtered by a second filter in combination with the U filter or it must be measured independently and then subtracted from the U readings. 1 The Johnson UBV standard. The plot shows the response in the three colors of the UBV system and that of the human eye.