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Vertex42 The Excel Nexus Summary

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Analysis Using Spreadsheets

A good way to begin the analysis of variable-star data, using a spreadsheet, is to import the data directly from your database. By using a database and the cut and paste capabilities of most software, you need only enter your data once, usually into the database. Then you can move large blocks of data into your spreadsheets. I recommend that you keep the field names the same within the database and spreadsheet. It will save time and reduce confusion. In some cases, you will want to expand your spreadsheet to include columns of calculated data that you do not wish to include within your database. A good way to keep your spreadsheet clean and uncluttered is to prepare one or more sections perhaps one section to allow you to import your database information, then a section separated by. a blank column in which you can perform your analysis calculations. Another section, slightly removed from the previous two, can be prepared to display your charts.

A spreadsheet approach to lightcurve period determination

What we'll do in this section is create an Excel spreadsheet that will enable you to determine the period of a lightcurve. If you created your differential photometry with TheSky, then you can export your data into Excel and use this spreadsheet to wrap the data from several sessions into a single lightcurve. This spreadsheet approach may be useful for your first few projects. It is a bit time-consuming, and it demands that you have some experience with spreadsheet formulas and graphs, but with it you can create a nice lightcurve. After you've used it a few times, and assuming that you get the asteroid lightcurve'' bug, you'll recognize the value of special-purpose data analysis software such as MPO Canopus or Peranso.

Apple Ladles on the Sauce

Apple's share in the personal computing market grew during the 1980s as improved versions of the Macintosh were introduced, complete with hard drives, increased RAM, and expansion slots. Also, a range of peripherals such as printers and scanners appeared. Among new software, all of which was produced by Apple itself, were spreadsheet and presentation software, and improved 'Pro' graphics and DTP applications. In 1989 Apple even launched a laptop, the Macintosh Portable, and the company later pioneered laptop ergonomics with the Powerbook 100, placing the keyboard behind a wrist rest and using a trackball pointing device to replace the mouse, which was placed centrally at the base of the keyboard.

Reducing and analyzing your data

Use carefully selected imaging parameters to gather your photometry of the target star during the transit window. Be sure to take good flats and darks for this condition. Reduce your images and perform photometric analysis in the usual way. For plotting the data, you may find it useful to export your photometry data (time, delta-mag) into a spreadsheet program. The spreadsheet allows you to adjust the plot parameters, to make any transit signature more visible, and also enables you to do some statistical filtering (averaging) to improve the SNR. If there is no transit signature, then the plot of delta-mag vs. time will be a straight line (i.e., constant brightness throughout the observing run). Determining the mean and standard deviation of the data gives you an indication of the quality of your data (e.g., ideally, you'll have a standard deviation of 0.01 mag or less). Determining the best-fit line through the data (which most spreadsheets can do quite automatically) will tell you...

Analysis Evaluation and Publication

Your treasured collection of results (descriptions, sketches) will grow with time, but what to do with them Maybe you have already discussed your observations with other amateurs. But you can do more. Analyze and evaluate your data, using the advantages of spreadsheet software. Input all relevant data in the table object, type, appearance (e.g., size and brightness estimates), place and time of observation, atmospheric conditions,

Dependence on junction site

Sample spreadsheet for calculating requirements to transfer water from LL1 to LEO. k2 is constant at 0.1, and the values of k correspond to those in Table 5.13. Table 5.15. Sample spreadsheet for calculating requirements to transfer water from LL1 to LEO. k2 is constant at 0.1, and the values of k correspond to those in Table 5.13. Table 5.16. Sample spreadsheet for calculating requirements to return the LWT from LEO to LL1. k2 is constant at 0.1 and k varies as shown in Table 5.13. Table 5.16. Sample spreadsheet for calculating requirements to return the LWT from LEO to LL1. k2 is constant at 0.1 and k varies as shown in Table 5.13.

Photometry Capable Computer Programs

Several computer programs that will perform photometric measurements are available to amateur astronomers. Essentially, you load an image from your CCD, designate the variable star, as well at the comparison star and a check star. The computer program will then compare the brightness of each star. When finished, the program will provide a report indicating the difference in magnitude between each star. Programs such as this are absolutely required when using a CCD. When using a photometer, a spreadsheet can be developed to quantify your measurements.

Earth Departure Stage EDS

A typical spreadsheet (for Case 4) is displayed as Table 7.8. A summary of estimates of IMLEO for the seven cases is given in Table 7.9. Serious doubts must be raised in regard to the ability of NASA-planned Launch Vehicles to deliver the various vehicles in their architecture.

Database Management

Within any database system, the field names are used to label each category of information, such as date, brightness estimate, type of observation, etc. Take a good look at your analysis needs and develop your field names with that requirement in mind. By doing so, you can move blocks of information from your database into your spreadsheet, for analysis, by simply using cut and paste. The reverse is also true you will be able to move data from your spreadsheet into your database by using cut and paste.

Specialpurpose period analysis programs

The advantage of programs such as Peranso or MPO Canopus is that they eliminate the need to re-format the spreadsheet for each new data set, they do all of the necessary calculations for you, they provide good estimates of the accuracy of the fit, and they each provide a wealth of other special features that are beyond the ability of a spreadsheet to offer. So, if you find yourself doing more than a few asteroid lightcurve projects, you will almost certainly want to invest in one or both of these fine programs.

Summary of Major Component Ratings

The power flow analysis determines the voltage and current throughout the power system, and establishes the power handling capability and heat dissipation of various components. It computes the power through various components, based on the component efficiencies marked on the spreadsheet. The converter efficiency, harness resistance and diode voltage drops The result of an energy balance analysis example for a 3000-W load LEO satellite on a spreadsheet is depicted in Figure 7.8. As seen in the lower half of the figure, the solar array must generate 5839 W and the battery must have an energy storage rating of 6804 Wh. An 80-cell NiH2 battery would require a 69-Ah rating to support a 3000-W load during an eclipse. The assumptions used in this example are listed on the spreadsheet. The spreadsheet algorithm is derived from the design methods developed in various chapters of this book. For a given EPS design, such a spreadsheet is also typically used to perform the following two types of...

Reducing and analyzing your observations

Now that you know the location and path of the asteroid, you are in a position to place your photometry aperture onto the comp stars and the asteroid, in frame after frame. If you're doing this manually, it can be something of a chore. A continuous series of 2-minute exposures for a 6-hour observing session, you'll have 180 images to reduce For my first asteroid lightcurve, I used a rudimentary CCD imaging program that allowed me to put the measuring aperture over one comp star to display the integrated ADUs. I typed this value into an Excel spreadsheet, then moved the measuring aperture to the asteroid, and entered its ADU into the spreadsheet. Then I loaded the next image, and repeated the process until all 180 images were reduced. This laborious routine had several meritorious consequences I learned a lot about the various flaws that you will find from time to time in your images, I avoided the cost of buying special-purpose software until after I had tried my hand at photometry,...

Figures

4.16 Overall layout of a spreadsheet for lightcurve period determination 127 4.17 Step 1 of creating the spreadsheet for lightcurve period determination 128 4.18 Step 2 of creating the spreadsheet for lightcurve period analysis 129 4.21 Completed spreadsheet, showing graph of un-adjusted data, ready for period

Mission Analysis

I like to think of the mission analysis process as a huge electronic spreadsheet model of a space system. On the left side of the spreadsheet matrix are die various parameters and alternatives that one might assess, such as power, orbit, number of satellites, and manning levels for ground stations. Along the bottom row are the system's quantitative outputs, indicating its performance, effectiveness, cost, and risk. The matrix itself would capture the functional relationships among the many variables. We would like to wiggle any particular parameter, such as the diameter of the objective in a detector lens or the number of people assigned to the ground station, and determine the effect on all other parameters. In this way, we could quantify the system's performance as a function of all possible variables and their combinations. Fortunately for the continuing employment of mission analysts, the above spreadsheet model does not yet exist* Instead, we analyze as many reasonable...

Transfer via LL1

Sample spreadsheet for calculating requirements to transfer 25 mT of water to LL1. Table 5.13. Sample spreadsheet for calculating requirements to transfer 25 mT of water to LL1. The next step is returning the empty LLT from LL1 to the Moon using some of the 25 mT of water at LL1 to produce propellants. The spreadsheet for doing this is shown in Table 5.14. Negative values in Column H for water remaining at LL1 indicate that for sufficiently high values of Kj, no water can be transferred. Table 5.14. Sample spreadsheet for calculating requirements to return the LLT from LL1 to the Moon. Table 5.14. Sample spreadsheet for calculating requirements to return the LLT from LL1 to the Moon. The next step is transfer of the remaining water from LL1 to LE0. Here, a trial-and-error procedure is used. We guess how much water can be transferred and the propellant requirements are calculated for this load, assuming some value of K2. The amount of water that must be electrolyzed at LL1...

Deepsky

Like other programs in this category, most indoor time with Deepsky is spent planning searching for objects in the program's databases, adding found objects to spreadsheets, and selecting objects from these spreadsheets to place in an evening's plan (observing list). A typical session starts with setting Deepsky s search filters. You might, for example, ask it to retrieve every NGC object in Virgo. That results in a spreadsheet full of 832 DSOs a bit much for a casual Saturday night run from the Mobile Astronomical Society dark site. To cull this list down, you scan through it, paying attention to object names, brightness, and extended details (retrieved by clicking on objects in the spreadsheet). When you happen on something that looks interesting or is on your lists of wannasees, you click the plan column on the sheet. The object is then automatically added to your observing list. When you're done, you save the completed plan, and you're all set for a night of productive DSO-ing. In...

Power Flow Analysis

The spreadsheet shown in Figure 7.8 illustrates the power flow necessary to maintain the energy balance for an EOS-AM satellite requiring 3000 W constant load during sunlight and also during an eclipse. It may use flywheel energy storage instead of a battery, but that would not change the analysis method. In addition to the power generation (solar array) and the energy storage (battery), it includes other components, such as the power

Tabula Rasa

M.F. came to see me with questions before each exam. They were typically about how much detailed information she needed to know. She was taking the course very seriously, organizing her notes into patterns that were particularly useful for her way of learning. The second clue (after the fact that she had never been interested in astronomy) that something about M.F. was unusual came as she turned in the final exam. Recall that I give the students the chance to get extra credit by turning in 42 incorrect beliefs that I have corrected for them throughout the semester. Handing me her list, she told me that she wanted to get the extra credit but could only think of a dozen incorrect beliefs. I'd never encountered a student who had any difficulty identifying 42, much less 12. The kicker came when I sat down to determine the final grades. I began with the raw exam scores, which I curved as necessary. Then I added in the extra-credit points. Finally I printed out a spreadsheet showing all the...

Below Bot 100

Click the Save button, and you will be prompted to save the spectrum data to a file. This file is spreadsheet friendly, and can be easily parsed into any standard program such as Microsoft Excel or Lotus 123. Once the spectral data have been loaded into a spreadsheet, you can use the same steps listed above to load the spectrum of a calibration source taken with the same spectrograph. To calibrate the wavelengths of the unknown spectrum, you must calibrate the wavelength curve of the spectrograph against a set of known spectral lines. Although grating spectra are nearly linear, they are not perfectly so and prism spectra are strongly nonlinear.

Rejection of Data

A spreadsheet is an excellent tool to analyze your variable-star data. Get to know the capabilities of your spreadsheet and how your observations can best be Spreadsheets allow you to display your information in many ways ranging from two-dimensional line graphs to three-dimensional contour maps. Selecting the proper display is important. If you've used spreadsheets before, and if you're familiar with statistics, then you know that you can support or refute almost any position using the same data. Because this is possible, you must be careful. Use methods that are familiar and accepted. If you're not sure what they are, ask. Present you observations with an honest intent to display your observations accurately. With all of that said, you're probably wondering what you can do with your data and a spreadsheet. You're going to be very pleased with the possibilities Now is when those lonely, cold nights of observing will result in something that you can show someone. You will be able to...

C3 Image Evaluation

Click on the Measure Statistics Image menu item. The Image Status window will be displayed. The information that appears in the Info window is also stored in the A P4 N'm Data Log. The Data Log is a separate window of the AIP4Win program and keeps a running log of all the measurements you make using the measurement tools. It appears in the icon tray at the bottom of your screen when A P4Win starts up. It can be minimized by clicking the minus (-) button in the upper right corner, and it will retire to the taskbar where it can be recalled later. This window is editable, it can be cleared, and it can be saved to a file. The tools that write to this window do so in a format that makes the contents easily parsed into a spreadsheet program such as Excel or Lotus. This permits you to perform further analysis on data you extract using AIP4Win. For now you can just minimize the Data Log. If you should accidentally close it, no problem it will be restarted the next...

Computer Databases

The example shown in Figure 23.2 is the data taken from a useful Excel spreadsheet by Brian Workman available via Another useful site is Richard Dibon-Smith's orbital pages at http www.dibonsmith.com orbits.htm. For raw data on double stars the data from the Hipparcos mission has been made available on a CD called Celestia 2000 which is available from Sky Publishing in North America or from ESA for the rest of the world. This CD allows you to search on the Hipparcos catalogue for double star data and provide a rudimentary plot of this data. The plotting functionality is not as great as the mainstream programs but the data is some of the more accurate positional data for the brighter stars that Hipparcos measured.

Dates and Times

You're probably wondering if you need to figure the number of days since 4713 BC. No, you don't. A list of Julian days, essentially a calendar, is available from the major variable star organizations. For your convenience, noon on 1 January 2002, is Julian day 2452276.0 It's easy to set up a list of Julian days using a spreadsheet. Remember, the Julian day begins at noon in Greenwich in other words, 1200 hrs UT. A calculator will help or you can set up a spreadsheet to help you. I find it easy to work with seconds when it comes to short intervals of time. If you multiply the number of hours in a day by 60 you can calculate the number of minutes in a day. The answer is 1440. If you now multiply the number of minutes in a day by 60 you can calculate the number of seconds in a day. The answer is 86,400. Now you can see that S Eri's period is 0.273 times 86,400, or 23,587.2 seconds. You can easily convert this to hours and minutes.

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