Quick Mean to Apparent
CALL sla_MAPQK (RM, DM, PR, PD, PX, RV, AMPRMS, RA, DA)
RM,DM | D | mean [α,δ] (radians) |
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PR,PD | D | proper motions: [α,δ] changes per Julian year |
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PX | D | parallax (arcsec) |
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RV | D | radial velocity (km s−1, +ve if receding) |
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AMPRMS | D(21) | star-independent mean-to-apparent parameters: |
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(1) |
| time interval for proper motion (Julian years) |
(2-4) |
| barycentric position of the Earth (AU) |
(5-7) |
| heliocentric direction of the Earth (unit vector) |
(8) |
| (gravitational radius of Sun)×2/(Sun-Earth distance) |
(9-11) |
| v: barycentric Earth velocity in units of c |
(12) |
| √1−|Unknown node type: b|2 |
(13-21) |
| precession-nutation 3×3 matrix |
RA,DA | D | apparent [α,δ] (radians) |