def __init__(self):
self.jpv=[ ( 'JD %s TDT' % (jdtt,)
, ( spice.convrt(float(x),'AU','KM'), spice.convrt(float(y),'AU','KM'), spice.convrt(float(z),'AU','KM'), )
, ( spice.convrt(float(xdot),'AU','KM')/spice.spd(), spice.convrt(float(ydot),'AU','KM')/spice.spd(), spice.convrt(float(zdot),'AU','KM')/spice.spd(), )
, )
for nm,jdtt,x,y,z,xdot,ydot,zdot
in [ i.strip().split() for i in self.__doc__.split('\n') if i[:9]=='CK12S010 ' ]
]
def convertDiffs(diXDiffs):
if isinstance(diXDiffs, timediffs.didiff):
diVTC = diXDiffs.imFracSec
diSCLK = '%010.0f:%03.0f' % (int(diVTC),256 * (diVTC%1.0),)
diET = spice.scs2e(-70,diSCLK)
diDoy = 185 + ((diET - et) / spice.spd())
return diDoy,diXDiffs.imFbDiff
else:
rtnDoys = []
rtnDiffs = []
for diXDiff in diXDiffs:
diDoy,diDiff = convertDiffs(diXDiff)
rtnDoys.append(diDoy)
rtnDiffs.append(diDiff)
return (rtnDoys,rtnDiffs,)
def convertDiffs(diXDiffs):
if isinstance(diXDiffs, timediffs.didiff):
diVTC = diXDiffs.imFracSec
diSCLK = '%010.0f:%03.0f' % (
int(diVTC),
256 * (diVTC % 1.0),
)
diET = spice.scs2e(-70, diSCLK)
diDoy = 185 + ((diET - et) / spice.spd())
return diDoy, diXDiffs.imFbDiff
else:
rtnDoys = []
rtnDiffs = []
for diXDiff in diXDiffs:
diDoy, diDiff = convertDiffs(diXDiff)
rtnDoys.append(diDoy)
rtnDiffs.append(diDiff)
return (
rtnDoys,
rtnDiffs,
)
found, et = spice.gdpool('ETSTART', 0, 1)
### S/C IDs
scids = [-70, -140]
n = len(scids)
rn = range(len(scids))
### for 15 days leading up to TOI
for i in range(16):
### Convert
### - ET to ISO Calendar and DOY UTCs
### - ET to DII and DIF SCLKs
### - SCLKs to encoded SCLK, scale by 1/256 to get s past J2k epoch
utcs = [spice.et2utc(et, 'isoc', 3), spice.et2utc(et, 'isod', 3)]
sclks = [spice.sce2s(scids[i], et) for i in rn]
encds = [spice.scencd(scids[i], sclks[i]) / 256e0 for i in rn]
### Build and print output
f3 = ' %.3f'
sencds = (f3 * n).strip() % tuple(
[spice.scencd(scids[i], sclks[i]) / 256e0 for i in rn])
diff3 = (f3 * (n + 1)).strip() % tuple([encds[0] - encds[1]] +
[et - encds[i] for i in rn])
print((
utcs,
sclks,
sencds,
diff3,
))
### Increment ET by 1d (spice.spd() = seconds/day)
et += spice.spd()
def test_horizons(self):
import horizons
target = 'C/2013 S1'
target = 'C/2011 L4'
spkFilename,spiceId,status = horizons.gomain(target)
spice.furnsh( spkFilename )
self.kernels += [spkFilename]
target_ = '_'.join( target.split() )
et0 = spice.utc2et( '2013-01-10T12:00:00' )
ls2au = spice.convrt( spice.clight(), 'KM', 'AU' )
dpr = spice.dpr()
spd = spice.spd()
deltatime = None
while deltatime is None or abs(deltatime) > 5e-7:
stS2I,lsS2I = spice.spkgeo( spiceId, et0, 'J2000', 10 )
posn, veloc = stS2I[:3], stS2I[3:]
deltatime = - spice.vdot( posn, veloc ) / spice.vdot( veloc, veloc )
et0 += deltatime
valarrs = [ ]
print( (deltatime,spice.et2utc(et0,'ISOC',3),) )
deltatime = 1.0
sixmonths = spice.pi() * 1e7
while deltatime < sixmonths:
for pmdet in (-deltatime,deltatime):
et = et0 + pmdet
utc = spice.et2utc(et,'ISOC',1)
stD2I,lsD2I = spice.spkgeo( spiceId, et, 'J2000', -140)
stI2S,lsI2S = spice.spkgeo( 10, et, 'J2000', spiceId )
stD2S,lsD2S = spice.spkgeo( 10, et, 'J2000', -140 )
rD2I, rI2S = [ ls * ls2au for ls in [lsD2I,lsI2S] ]
aDIS, aSDI = [ ang * dpr for ang in
[ spice.vsep( spice.vminus(stD2I[:3]), stI2S[:-3] )
, spice.vsep( stD2S[:3], stD2I[:-3] )
]
]
valarrs += [ (et,pmdet,rD2I,rI2S,aDIS,aSDI,utc,) ]
deltatime *= 1.2
valarrs.sort()
for valarr in valarrs:
print( '%12.1f %9.3f %9.3f %7.2f %7.2f %s' % valarr[1:] )
days = [i[1]/spd for i in valarrs]
titles = [ i % (target_,) for i in """
Range, %s-DI, AU
Range, %s-Sun, AU
Phase, DI-%s-Sun, deg
Elongation, Sun-DI-%s, deg
""".strip().split('\n')]
try:
### Moved matplotlib import to here so test runs to here at least
from matplotlib import pyplot as plt
plt.figure(1)
for idx in range(len(titles)):
ordinate = [i[idx+2] for i in valarrs]
plt.subplot( 221+idx )
plt.plot( days, ordinate )
plt.plot( days, ordinate, '.')
plt.title( titles[idx] )
plt.ylabel( titles[idx] )
if idx>1: plt.xlabel( 'T-Tperi, d' )
plt.show()
except:
print( "Bypassed, or failed, matplotlib tests" )
def test_horizons(self):
import horizons
target = 'C/2013 S1'
target = 'C/2011 L4'
spkFilename, spiceId, status = horizons.gomain(target)
spice.furnsh(spkFilename)
self.kernels += [spkFilename]
target_ = '_'.join(target.split())
et0 = spice.utc2et('2013-01-10T12:00:00')
ls2au = spice.convrt(spice.clight(), 'KM', 'AU')
dpr = spice.dpr()
spd = spice.spd()
deltatime = None
while deltatime is None or abs(deltatime) > 5e-7:
stS2I, lsS2I = spice.spkgeo(spiceId, et0, 'J2000', 10)
posn, veloc = stS2I[:3], stS2I[3:]
deltatime = -spice.vdot(posn, veloc) / spice.vdot(veloc, veloc)
et0 += deltatime
valarrs = []
print((
deltatime,
spice.et2utc(et0, 'ISOC', 3),
))
deltatime = 1.0
sixmonths = spice.pi() * 1e7
while deltatime < sixmonths:
for pmdet in (-deltatime, deltatime):
et = et0 + pmdet
utc = spice.et2utc(et, 'ISOC', 1)
stD2I, lsD2I = spice.spkgeo(spiceId, et, 'J2000', -140)
stI2S, lsI2S = spice.spkgeo(10, et, 'J2000', spiceId)
stD2S, lsD2S = spice.spkgeo(10, et, 'J2000', -140)
rD2I, rI2S = [ls * ls2au for ls in [lsD2I, lsI2S]]
aDIS, aSDI = [
ang * dpr for ang in [
spice.vsep(spice.vminus(stD2I[:3]), stI2S[:-3]),
spice.vsep(stD2S[:3], stD2I[:-3])
]
]
valarrs += [(
et,
pmdet,
rD2I,
rI2S,
aDIS,
aSDI,
utc,
)]
deltatime *= 1.2
valarrs.sort()
for valarr in valarrs:
print('%12.1f %9.3f %9.3f %7.2f %7.2f %s' % valarr[1:])
days = [i[1] / spd for i in valarrs]
titles = [
i % (target_, ) for i in """
Range, %s-DI, AU
Range, %s-Sun, AU
Phase, DI-%s-Sun, deg
Elongation, Sun-DI-%s, deg
""".strip().split('\n')
]
try:
### Moved matplotlib import to here so test runs to here at least
from matplotlib import pyplot as plt
plt.figure(1)
for idx in range(len(titles)):
ordinate = [i[idx + 2] for i in valarrs]
plt.subplot(221 + idx)
plt.plot(days, ordinate)
plt.plot(days, ordinate, '.')
plt.title(titles[idx])
plt.ylabel(titles[idx])
if idx > 1: plt.xlabel('T-Tperi, d')
plt.show()
except:
print("Bypassed, or failed, matplotlib tests")
import pprint
print(__doc__.replace('\b','\\b'))
spice.furnsh(__file__)
### ET of TOI-15d
found,et = spice.gdpool( 'ETSTART', 0, 1 )
### S/C IDs
scids = [-70,-140]
n = len(scids)
rn = range(len(scids))
### for 15 days leading up to TOI
for i in range(16):
### Convert
### - ET to ISO Calendar and DOY UTCs
### - ET to DII and DIF SCLKs
### - SCLKs to encoded SCLK, scale by 1/256 to get s past J2k epoch
utcs = [ spice.et2utc( et, 'isoc', 3), spice.et2utc( et, 'isod', 3) ]
sclks = [ spice.sce2s(scids[i],et) for i in rn ]
encds = [ spice.scencd(scids[i],sclks[i])/256e0 for i in rn ]
### Build and print output
f3 = ' %.3f'
sencds = (f3*n).strip() % tuple([ spice.scencd(scids[i],sclks[i])/256e0 for i in rn ])
diff3 = (f3*(n+1)).strip() % tuple( [encds[0] - encds[1]] + [ et-encds[i] for i in rn ])
print( (utcs,sclks,sencds,diff3,) )
### Increment ET by 1d (spice.spd() = seconds/day)
et += spice.spd()
### Convert ET to SCLKs and Vehicle Time Codes (=Encoded SCLK/256)
sclks = [ spice.sce2s(scids[i],et) for i in scidrn ]
vtcs = [ spice.scencd(scids[i],sclks[i])/256e0 for i in scidrn ]
### Calculate differences
diffs[iDay] = [vtcs[0] - vtcs[1]] + [ et-vtcs[i] for i in scidrn ]
### Output UTCs, SCLKs, and ET-SCLK differences for every ninth day
if (iDay%9) == 0:
utcs = [spice.et2utc( et, 'isoc', 3), spice.et2utc( et, 'isod', 3)]
svtcs = f3(n) % tuple([ spice.scencd(scids[i],sclks[i])/256e0
for i in scidrn
])
sdiffs = f3(n+1) % tuple( diffs[iDay] )
print( (utcs,sclks,svtcs,sdiffs,) )
### Increment ET by 1d
et += spice.spd()
et -= spice.spd()
print(__doc__.strip().replace('\b','\\b'))
### Get DII & DIF time correlation data for approach, suspect point,
### and TOI times
def convertDiffs(diXDiffs):
if isinstance(diXDiffs, timediffs.didiff):
diVTC = diXDiffs.imFracSec
diSCLK = '%010.0f:%03.0f' % (int(diVTC),256 * (diVTC%1.0),)
diET = spice.scs2e(-70,diSCLK)
diDoy = 185 + ((diET - et) / spice.spd())
return diDoy,diXDiffs.imFbDiff
### https://github.com/drbitboy/PySPICE import spice dot = '.' ### Load kernels using this source as SPICE meta-kernel spice.furnsh(dot.join(__file__.split(dot)[:-1] + ['py'])) ### Set arguments for Geometry Finder call ### - Times when VENUS crosses equator of Jupiter (Zjup = 0) ### - abcorr='LT+S' - correct for light time and stellar aberration ### - Timestep of 10 days (spice.spd() = seconds per day) ### - nintvls - 450 seems to work here target, frame, abcorr, obsrvr = 'VENUS', 'IAU_JUPITER', 'LT+S', 'JUPITER' relate, crdsys, coord = '=', 'RECTANGULAR', 'Z' refval, adjust, step, nintvls = 0.0, 0.0, spice.spd()*10, 450 ### Range of ETs to test etlo,ethi = [spice.gdpool(s,0,1)[1] for s in 'ETLO ETHI'.split()] cnfine = spice.wninsd( etlo, ethi, spice.objects.Cell(spice.DataType.SPICE_DP,2)) ### Create DP window to receive results result = spice.objects.Cell(spice.DataType.SPICE_DP,500) ### Make the call to the generic Geometry Finder call cnfine, result = spice.gfposc( target, frame, abcorr, obsrvr, crdsys, coord, relate, refval, adjust, step, nintvls, cnfine, result ) ### Output results as four columns ### - Crossing ordinal ### - UTC of crossing as ISO calendar time ### - TDB of crossing as calendar time (no leapseconds)
diffs[iDay] = [vtcs[0] - vtcs[1]] + [et - vtcs[i] for i in scidrn]
### Output UTCs, SCLKs, and ET-SCLK differences for every ninth day
if (iDay % 9) == 0:
utcs = [spice.et2utc(et, 'isoc', 3), spice.et2utc(et, 'isod', 3)]
svtcs = f3(n) % tuple(
[spice.scencd(scids[i], sclks[i]) / 256e0 for i in scidrn])
sdiffs = f3(n + 1) % tuple(diffs[iDay])
print((
utcs,
sclks,
svtcs,
sdiffs,
))
### Increment ET by 1d
et += spice.spd()
et -= spice.spd()
print(__doc__.strip().replace('\b', '\\b'))
### Get DII & DIF time correlation data for approach, suspect point,
### and TOI times
def convertDiffs(diXDiffs):
if isinstance(diXDiffs, timediffs.didiff):
diVTC = diXDiffs.imFracSec
diSCLK = '%010.0f:%03.0f' % (
int(diVTC),
256 * (diVTC % 1.0),
