The temperature and radius of each star are also listed. The light curve shows the relative brightness as a function of orbital phase. You must click on 'enter values' for values you change to take effect. One can control the spectral class of the stars, the inclination ('angle') and the binary separation (circular orbits assumed). This applet shows light curves for eclipsing Main Sequence binary stars. The applet can also be used to show that there is no directional dependence in the inverse-square law.Įclipsing Binary Light Curve (eclipsingBinaries.html) Each plot can be cleared using the button at the bottom right. For the faintest source, because of the noise, it is not clear which is better unless points quite close to the source are taken. The grey and black curves in each plot show inverse-square and inverse-linear relations, so students can discover which law fits the data better. The measurements have noise, which is very noticeable for the faintest source and not so noticeable for the brightest. By clicking anywhere within the grey circle surrounding the source, a point appears on the graph below it of intensity vs. The distance and apparent brightness (labeled 'intensity') are shown as you move the probe. Use the cursor to move the 'probe' to different distances from each source. The sources' luminosities increase by factors of 10. This allows students to explore the inverse square law by taking simulated measurements of the apparent brightness of sources of three different luminosities at different distances from them. Inverse Square Law for Light (luminosity.html) You can center the view on any of the objects, change the speed, and control which orbit paths and labels are shown. Alternatively, controls allow you to rotate and zoom the display. If you have a mouse wheel, you can use it to zoom in and out. By dragging the mouse you can change the viewing angle of the Solar System. The planets, Pluto, Eris, and Halley's Comet. This applet is similar to a Java version created by JPL, and shows an animation of the orbits of There is also a slow motion control and a 'clear' button to erase all the sweeps. The applet also continuously reports the object's distance from the Sun, it's current velocity, and it's maximum and minimum velocities over the orbit. For a custom object, you can enter your own semi-major axis and eccentricity in the boxes and then click on 'enter'. You can control the time interval with the "sector size" slider. By clicking at other times during the orbit, you can compare the swept out areas. By clicking anywhere in the image, an area is swept out, dictated by the location of the object when you clicked. The planet is shown orbiting around a focus which represents the center of mass of a two-body orbit. It allows you to visualize Kepler's Second Law by sweeping out equal areas for a fixed time interval for any of the planets, Pluto, Halley's Comet, or a custom object. This is similar to the applet created by the University of Nebraska-Lincoln but with a few differences. There are a few other controls to explore. You can also change the orbit radius of Venus or Mars to see the effect of orbit size on retrograde motion. For the planets Venus, Earth, and Mars, it allows you to view the retrograde motion of any of these planets from any one of the others. This is a version of the Java applet created by the McGraw-Hill Companies. Just choose an object, or choose 'custom' and put in a mass and radius, then put in an Earth weight, and your weight on the other object will be displayed. This applet is a simple one that allows you to calculate your weight on other objects: the planets, Pluto, and a custom object where you can enter your own mass and radius (in Earth units). The applets are as follows:Ĭalculate Your Weight on Other Objects (weightCalc.html) These applets are provided free to the community but if you use them, please acknowledge Kevin Dilts and the University of New Mexico. The applets have been tested in recent versions of Firefox, Internet Explorer and Chrome browsers. To run an applet in Windows, for example, just double-click on the html filename and it should open in your default browser. So to ensure that they all work, keep this folder structure unchanged. js files in subfolders called js and d3 that are called upon by most of the applets. The applets extract into one folder, with auxiliary. The files are in a zip archive called astro_applets.zip. They are designed to replace Java versions of the same applets that we have been using in our introductory astronomy courses but which have become increasingly difficult to support. These Javascript applets have been written at the Department of Physics and Astronomy of the University of New Mexico by Kevin Dilts. Javascript Versions of Popular Java Applets for Introductory Astronomy
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