./
esp_calc_pointing.pro
top source esp_calc_pointing
utility
esp_calc_pointing, diodes, jd, alpha=alpha, beta=beta, latitude=latitude, longitude=longitude
Calculate ESP pointing in alpha/beta and heliocentric latitude and longitude. This routine calculates the position of the ESP quadrant diode center of brightness in alpha and beta, explained below, and presuming that the spacecraft is properly pointed at the center of the Sun, the corresponding heliocentric latitude and longitude of the center of brightness.
Parameters
- diodes in required
calibrated/dark-corrected diode values. Can be quadrant fraction. These values are normalized before use. Array of 4 values, index 0 to 3 match up with quadrant diode names Q0-Q3
- jd in required
julian date of observation
Keywords
- alpha out
Solar alpha angle (E/W) in arcminutes. Positive when center of brightness is east/left of ESP axis
- beta out
Solar beta angle (N/S) in arcminutes. Positive when center of brightness is north/above ESP axis
- latitude out
Heliocentric latitude of ESP center, in degrees, positive north, taking into account the B0 nodding
- longitude out
Heliocentric longitude of ESP center, in degrees, sub-earth longitude is zero.
File attributes
Modification date: | Tue Sep 11 18:41:47 2012 |
Lines: | 29 |
Docformat: | rst rst |