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Fix spelling mistakes

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Jon Beniston 2021-01-29 16:47:07 +00:00
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1 changed files with 16 additions and 13 deletions
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plugins/feature/startracker/readme.md
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@ -34,13 +34,13 @@ Pressing this button displays a settings dialog, that allows you to set:
* The epoch used when entering RA and Dec. This can be either J2000 (which is used for most catalogues) or JNOW which is the current date and time.
* The units used for the display of the calculated azimuth and elevation. This can be either degrees, minutes and seconds or decimal degrees.
* Whether to correct for atmospheric refaction. You can choose either no correction, the Saemundsson algorithm, typically used for optical astronomy or the more accurate Positional Astronomy Library calculation, which can be used for >250MHz radio frequencies or light. Note that there is only a very minor difference between the two.
* Whether to correct for atmospheric refraction. You can choose either no correction, the Saemundsson algorithm, typically used for optical astronomy or the more accurate Positional Astronomy Library calculation, which can be used for >250MHz radio frequencies or light. Note that there is only a very minor difference between the two.
* Air pressure in millibars for use in refraction correction.
* Air temperature in degrees Celsius for use in refraction correction.
* Relative humidity in % for use in refraction correction.
* Height above sea level in metres for use in refraction correction.
* Temperature lapse rate in Kelvin per kilometer for use in refraction correction.
* What data to display for the Solar flux measurement. Data can be selected from 2800 from DRAO or a number of different frequencies from Learmonth. Also, the Learnmonth data can be linearly interpolated to the observation frequency set in the main window.
* Temperature lapse rate in Kelvin per kilometre for use in refraction correction.
* What data to display for the Solar flux measurement. Data can be selected from 2800 from DRAO or a number of different frequencies from Learmonth. Also, the Learmonth data can be linearly interpolated to the observation frequency set in the main window.
* The units to display the solar flux in, either Solar Flux Units, Jansky or Wm^-2Hz-1. 1 sfu equals 10,000 Jansky or 10^-22 Wm^-2Hz-1.
* The update period in seconds, which controls how frequently azimuth and elevation are re-calculated.
* The IP port number the Stellarium server listens on.
@ -81,7 +81,7 @@ To allow Stellarium to set the RA and Dec, select Custom, and ensure the Stellar
| Moon | Moon | Targets our Moon | 2 (50MHz), 1000 (1.4GHz) |
| PSR B0329+54 | Pulsar | Strongest in Northern hemisphere (J0332+5434) | 1.8 (50MHz), 1.5 (400MHz), 0.2 (1.4GHz) |
| PSR B0833-45 | Pulsar | Strongest in Southern hemisphere (J0835-4510) | 5.4 (150MHz), 5.0 (400MHz), 1.0 (1.4GHz) |
| Sagittarius A | Galatic centre | First detected source of extrasolar radio | ~0.5 (<1GHz) for Sgr A* |
| Sagittarius A | Galactic centre | First detected source of extrasolar radio | ~0.5 (<1GHz) for Sgr A* |
| Cassiopeia A | Supernova | Brightest extrasolar radio source | 27k (50MHz), 10k (150MHz), 1768 (1.4GHz) |
| Cygnus A | Galaxy | First radio galaxy | 22k (50MHz), 11k (150MHz), 1579 (1.4GHz) |
| Taurus A (M1) | Supernova/Pulsar | Crab Nebular | 2008 (50MHz), 1368 (150MHz), 829 (1.4GHz) |
@ -100,7 +100,7 @@ Enter the frequency of observation in MHz. This value is used for sky temperatur
<h3>13: Beamwidth</h3>
Enter the halfpower (-3dB) beamwidth of your antenna. This value is used for sky temperature calculation.
Enter the half power (-3dB) beamwidth of your antenna. This value is used for sky temperature calculation.
<h3>14: Right Ascension</h3>
@ -124,22 +124,25 @@ Displays the calculated elevation (angle in degrees - 0 to horizon and 90 to zen
![Star Tracker Elevation vs Time](../../../doc/img/StarTracker_elevationvstime.png)
In order to assit in determining whether and when observations of the target object may be possible, an elevation vs time plot is drawn for the 24 hours encompassing the selected date and time.
Some objects may not be visible from a particular latitude for the specified time, in which case, the grahp title will indicate the object is not visible on that particular date.
In order to assist in determining whether and when observations of the target object may be possible, an elevation vs time plot is drawn for the 24 hours encompassing the selected date and time.
Some objects may not be visible from a particular latitude for the specified time, in which case, the graph title will indicate the object is not visible on that particular date.
<h3>Solar flux vs frequency</h3>
![Star Tracker Solar Flux](../../../doc/img/StarTracker_solarflux.png)
The Solar flux vs frequency plot, shows the solar flux data from the Learmonth observator as a function of frequency.
The Solar flux vs frequency plot, shows the solar flux density data from the Learmonth observatory as a function of frequency. The measurements are made at 245, 410, 610, 1415, 2695, 4995, 8800 and 15400MHz.
<h3>Sky temperature</h3>
![Star Tracker sky temperature](../../../doc/img/StarTracker_skytemp.png)
Sky temperature maps are available for display at 150MHz, 408MHz and 1420MHz, in both equatorial and galactic coordinates.
Background sky temperature maps are available for display at 150MHz, 408MHz and 1420MHz, in both equatorial and galactic coordinates.
For these first six temperature maps, the temperature reported, which is in Kelvin, is for the single pixel corresponding to the target coordinates.
This temperature is therefore valid for a beamwidth of less than 1 degree.
The Star Tracker plugin can also estimate a sky temperature based on the observation frequency and beamwidth entered.
The Star Tracker plugin can also estimate a sky temperature based on the user entered observation frequency and beamwidth.
To see this figure, which will be typically lower than the above, select one of the last two temperature maps from the right hand combo box.
<h2>Map</h2>
@ -163,7 +166,7 @@ Then in Stellarium:
* Press the telescope button in the main toolbar
* Press "Configure telescopes..."
* Press "Add a new telescope"
* Set "Telescope controlled by" to "External softare or a remote computer"
* Set "Telescope controlled by" to "External software or a remote computer"
* Set "Name" to "SDRangel" (Optional)
* Set "Coordinate system" to "J2000 (default)"
* Press OK
@ -181,7 +184,7 @@ Then select the SDRangel telescope reticle and press Ocular view.
Solar radio flux measurement at 10.7cm/2800MHz is from National Research Council Canada and Natural Resources Canada: https://www.spaceweather.gc.ca/solarflux/sx-4-en.php
Salar radio flux mesaurements at 245, 410, 610, 1415, 2695, 4995, 8800 and 15400MHz from the Learmonth Observatory: http://www.sws.bom.gov.au/World_Data_Centre/1/10
Solar radio flux measurements at 245, 410, 610, 1415, 2695, 4995, 8800 and 15400MHz from the Learmonth Observatory: http://www.sws.bom.gov.au/World_Data_Centre/1/10
150MHz (Landecker and Wielebinski) and 1420MHz (Stockert and Villa-Elisa) All Sky images from MPIfR's (Max-Planck-Institut Fur Radioastronomie) Survey Sampler: https://www3.mpifr-bonn.mpg.de/survey.html
@ -205,7 +208,7 @@ To start tracking:
curl -X POST "http://127.0.0.1:8091/sdrangel/featureset/0/feature/0/run"
<h2>Devloper Notes</h2>
<h2>Developer Notes</h2>
To convert FITS images between projections, use Montage: