From d54fe7c1f704a63824c5bfa0ece65245572e9b27 Mon Sep 17 00:00:00 2001 From: Joseph Hunkeler Date: Wed, 4 Mar 2015 21:21:30 -0500 Subject: Initial commit --- src/slalib/sun67.htx/node148.html | 256 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 256 insertions(+) create mode 100644 src/slalib/sun67.htx/node148.html (limited to 'src/slalib/sun67.htx/node148.html') diff --git a/src/slalib/sun67.htx/node148.html b/src/slalib/sun67.htx/node148.html new file mode 100644 index 0000000..70ca411 --- /dev/null +++ b/src/slalib/sun67.htx/node148.html @@ -0,0 +1,256 @@ + + + + +SLA_PLANTE - of Planet from Elements + + + + + + + + + + + + +
+ +next + +up + +previous +
+ Next: SLA_PM - Proper Motion +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_PLANET - Planetary Ephemerides +

+

+

    +
+SLA_PLANTE - $[\,\alpha,\delta\,]$ of Planet from Elements +

+
+
ACTION: +
Topocentric apparent $[\,\alpha,\delta\,]$ of a Solar-System object whose +heliocentric orbital elements are known. +

CALL: +
CALL sla_PLANTE ( + DATE, ELONG, PHI, JFORM, EPOCH, ORBINC, ANODE, PERIH, + AORQ, E, AORL, DM, RA, DEC, R, JSTAT) +

+

+
GIVEN: +
+
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
DATEDMJD of observation (JD-2400000.5)
ELONG,PHIDobserver's longitude (east +ve) and latitude
radians)
JFORMIchoice of element set (1-3, see Note 4, below)
EPOCHDepoch of elements (t0 or T, TT MJD)
ORBINCDinclination (i, radians)
ANODEDlongitude of the ascending node ($\Omega$, radians)
PERIHDlongitude or argument of perihelion +($\varpi$ or $\omega$,
radians)
AORQDmean distance or perihelion distance (a or q, AU)
EDeccentricity (e)
AORLDmean anomaly or longitude (M or L,
radians, JFORM=1,2 only)
DMDdaily motion (n, radians, JFORM=1 only)
+

+
RETURNED: +
+
+ + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + +
RA,DECDtopocentric apparent $[\,\alpha,\delta\,]$ (radians)
RDdistance from observer (AU)
JSTATIstatus:
0 = OK
-1 = illegal JFORM
-2 = illegal E
-3 = illegal AORQ
-4 = illegal DM
-5 = numerical error
+

+
NOTES: +
+
1. +
DATE is the instant for which the prediction is +required. It is in the TT timescale (formerly +Ephemeris Time, ET) and is a + Modified Julian Date (JD-2400000.5). +
2. +
The longitude and latitude allow correction for geocentric + parallax. This is usually a small effect, but can become + important for Earth-crossing asteroids. Geocentric positions + can be generated by appropriate use of the routines + sla_EVP and sla_PLANEL. +
3. +
The elements are with respect to the J2000 ecliptic and equinox. +
4. +
Three different element-format options are available, as + follows.
+

+JFORM=1, suitable for the major planets: +


+ 		 EPOCH 		 = 		 epoch of elements t0 (TT MJD)
+		 ORBINC 		 = 		 inclination i (radians)
+		 ANODE 		 = 		 longitude of the ascending node $\Omega$ (radians)
+		 PERIH 		 = 		 longitude of perihelion $\varpi$ (radians)
+		 AORQ 		 = 		 mean distance a (AU)
+		 E 		 = 		 eccentricity e 
+		 AORL 		 = 		 mean longitude L (radians)
+		 DM 		 = 		 daily motion n (radians)        
+
+

+JFORM=2, suitable for minor planets: +


+ 		 EPOCH 		 = 		 epoch of elements t0 (TT MJD)
+		 ORBINC 		 = 		 inclination i (radians)
+		 ANODE 		 = 		 longitude of the ascending node $\Omega$ (radians)
+		 PERIH 		 = 		 argument of perihelion $\omega$ (radians)
+		 AORQ 		 = 		 mean distance a (AU)
+		 E 		 = 		 eccentricity e 
+		 AORL 		 = 		 mean anomaly M (radians)        
+
+

+JFORM=3, suitable for comets: +


+ 		 EPOCH 		 = 		 epoch of perihelion T (TT MJD)
+		 ORBINC 		 = 		 inclination i (radians)
+		 ANODE 		 = 		 longitude of the ascending node $\Omega$ (radians)
+		 PERIH 		 = 		 argument of perihelion $\omega$ (radians)
+		 AORQ 		 = 		 perihelion distance q (AU)
+		 E 		 = 		 eccentricity e
+
+
5. +
Unused elements (DM for JFORM=2, AORL and DM for JFORM=3) are + not accessed. +
+
+ +next + +up + +previous +
+ Next: SLA_PM - Proper Motion +
+Up: SUBPROGRAM SPECIFICATIONS +
+ Previous: SLA_PLANET - Planetary Ephemerides +

+

+

+SLALIB --- Positional Astronomy Library
Starlink User Note 67
P. T. Wallace
12 October 1999
E-mail:ptw@star.rl.ac.uk +
+ + -- cgit