Changes between Version 10 and Version 11 of Ask_an_expert

Timestamp:

Aug 10, 2009, 2:10:46 PM (17 years ago)

Author:

pitts

Comment:

--

Ask_an_expert

@@ -26 +26 @@
             1) You can use "mextract" to pull individual measurements, including magnitude (using the proper photcode) and time of the measurment (using the "time" keyword). Eventually, you will be able to use the "OBJID" keyword to pull all the measurements associated with a given object, but for now you can use the RA and DEC keywords to isolate the object (i.e., use boolean logic to pull out all measurments within about 1 arcsec of the object):
              -> catdir (data catalog)
+
              -> region (ra) (dec) (radius)
+
              -> define values for object's position obj_ra and obj_dec
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              -> mextract -region (photcode),(photcode):err,time where (sqrt(((RA-obj_ra)*cos(DEC))^2 + (DEC-obj_dec)^2) <= 0.0003)
+
             2) Now you can plot up the data:
              -> set xvec = time; set yvec = (photcode); set zvec = (photcode):err
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              -> device -n lightcurve
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              -> labels -fn times 14 -x "time (sec)" -y "mag" +x "Lightcurve"
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              -> limits xvec yvec; box -lw 2
+
              To plot points:
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              -> plot -x 2 -pt 1 -sz 1.5 -c black xvec yvec -dy zvec
+
              To connect the points:
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              -> plot -x 0 -lt 0 -lw 1 -c green xvec yvec