API VERSION: 1.2 API SOURCE: NASA/JPL Horizons API ******************************************************************************* Revised: Sep 02, 2026 Chandra Spacecraft (X-ray observatory) / (Earth) -151 http://xrtpub.harvard.edu/index.html Chandra X-ray Observatory: Deployment (STS-93) = July 23, 1999 Data storage = 1.8 gbs Science mission = ~5 years Length (sun shade open) = 45.3 m Orbital check-out = 2 months Length (sun shade clsd) = 38.7 m ORBITAL DATA: Inclination = 28.5 degrees Orbital period = ~64 hours Apogee altitude = ~ 86,487 km Observing time / orbit = ~55 hours Perigee altitude = ~ 5,999 km WEIGHTS & PROPULSION: Dry = 10,560 lbs Propellant = 2,153 lbs Pressurant = 10 lb Total launch weight = 12,930 lb Engines = 4 Thrust per engine = 105 lb SPACECRAFT TRAJECTORY (from CFA): Trajectory after 2026-Sep-01 is a prediction Trajectory name Start Stop ---------------------------- ----------- ----------- cxo_99219_06045 1999-Aug-07 2006-Feb-14 cxo_06002_10103 2006-Feb-03 2010-Feb-25 CXO_10056_27061 2010-Feb-25 2027-Mar-02 ******************************************************************************* ******************************************************************************* Ephemeris / API_USER Mon Sep 14 14:05:29 2026 Pasadena, USA / Horizons ******************************************************************************* Target body name: Chandra Observatory (spacecraft) (-151) {source: chandra_merged} Center body name: Earth (399) {source: chandra_merged} Center-site name: iTelescope Obs., Siding Spring ******************************************************************************* Start time : A.D. 2026-Sep-02 00:00:00.0000 UT Stop time : A.D. 2026-Sep-05 00:00:00.0000 UT Step-size : 10 minutes ******************************************************************************* Target pole/equ : undefined Target radii : undefined Center geodetic : 149.0644, -31.2733577, 1.16499 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 149.0644,5457.31536,-3292.4397 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : ITRF93 {East-longitude positive} Center radii : 6378.137, 6378.137, 6356.752 km {Equator_a, b, pole_c} Target primary : Earth Vis. interferer : MOON (R_eq= 1737.400) km {source: chandra_merged} Rel. light bend : Sun {source: chandra_merged} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian RTS-only print : NO EOP file : eop.260911.p261208 EOP coverage : DATA-BASED 1962-JAN-20 TO 2026-SEP-11. PREDICTS-> 2026-DEC-07 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation ( 0.0deg=YES),Airmass (>38.000=NO), Daylight (YES) Table cut-offs 2: Solar elongation ( 12.0,180.0=YES),Local Hour Angle( 0.0=NO ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) *************************************************************************************************************************************************************************************************************************************************** Date__(UT)__HR:MN R.A._____(ICRF)_____DEC Azi____(a-app)___Elev APmag S-brt r rdot delta deldot S-O-T /r S-T-O T-O-M/MN_Illu% RA_3sigma DEC_3sigma Sky_motion Sky_mot_PA RelVel-ANG *************************************************************************************************************************************************************************************************************************************************** $$SOE >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2026-Sep-02 08:00 C 18 27 03.22 +29 15 33.8 25.279554 24.422109 n.a. n.a. 1.009236385142 0.0698634 0.00080127325730 -1.0083185 107.8474 /T 72.1091 105.7/ 71.6317 n.a. n.a. 68.382432 160.62244 -56.70138 2026-Sep-02 08:10 C 18 27 20.18 +29 04 41.0 23.212965 25.442917 n.a. n.a. 1.009236655664 0.0650188 0.00079722888820 -1.0082950 107.9646 /T 71.9921 105.8/ 71.5379 n.a. n.a. 69.525095 161.43256 -56.39744 2026-Sep-02 08:20 N 18 27 36.72 +28 53 34.2 21.085502 26.400464 n.a. n.a. 1.009236906564 0.0600783 0.00079318506095 -1.0080516 108.0818 /T 71.8752 105.9/ 71.4444 n.a. n.a. 70.728030 162.17721 -56.07158 2026-Sep-02 08:30 N 18 27 52.87 +28 42 13.0 18.898370 27.291485 n.a. n.a. 1.009237137453 0.0550397 0.00078914261137 -1.0076115 108.1990 /T 71.7582 106.0/ 71.3514 n.a. n.a. 71.988337 162.85593 -55.72609 2026-Sep-02 08:40 N 18 28 08.68 +28 30 37.1 16.653354 28.112760 n.a. n.a. 1.009237347932 0.0499004 0.00078510228101 -1.0069985 108.3166 /T 71.6409 106.2/ 71.2587 n.a. n.a. 73.303162 163.46869 -55.36327 2026-Sep-02 08:50 A 18 28 24.22 +28 18 46.2 14.352857 28.861149 n.a. n.a. 1.009237537592 0.0446578 0.00078106471417 -1.0062372 108.4346 /T 71.5231 106.3/ 71.1665 n.a. n.a. 74.669731 164.01589 -54.98533 2026-Sep-02 09:00 A 18 28 39.52 +28 06 40.2 11.999934 29.533640 n.a. n.a. 1.009237706014 0.0393092 0.00077703045486 -1.0053530 108.5532 /T 71.4047 106.4/ 71.0748 n.a. n.a. 76.085384 164.49823 -54.59447 2026-Sep-02 09:10 18 28 54.65 +27 54 18.6 9.598298 30.127392 n.a. n.a. 1.009237852766 0.0338517 0.00077299994400 -1.0043720 108.6728 /T 71.2855 106.6/ 70.9837 n.a. n.a. 77.547595 164.91674 -54.19279 2026-Sep-02 09:20 18 29 09.66 +27 41 41.4 7.152320 30.639788 n.a. n.a. 1.009237977407 0.0282824 0.00076897351695 -1.0033207 108.7933 /T 71.1651 106.7/ 70.8932 n.a. n.a. 79.053997 165.27271 -53.78232 2026-Sep-02 09:30 18 29 24.60 +27 28 48.2 4.667004 31.068477 n.a. n.a. 1.009238079481 0.0225984 0.00076495140091 -1.0022264 108.9152 /T 71.0436 106.8/ 70.8032 n.a. n.a. 80.602399 165.56760 -53.36504 2026-Sep-02 09:40 18 29 39.53 +27 15 39.0 2.147932 31.411426 n.a. n.a. 1.009238158523 0.0167964 0.00076093371289 -1.0011168 109.0384 /T 70.9205 107.0/ 70.7139 n.a. n.a. 82.190802 165.80308 -52.94283 2026-Sep-02 09:50 t 18 29 54.51 +27 02 13.4 359.601199 31.666957 n.a. n.a. 1.009238214052 0.0108731 0.00075692045764 -1.0000203 109.1634 /T 70.7958 107.1/ 70.6254 n.a. n.a. 83.817408 165.98095 -52.51749 2026-Sep-02 10:00 18 30 09.59 +26 48 31.3 357.033321 31.833790 n.a. n.a. 1.009238245575 0.0048251 0.00075291152595 -0.9989652 109.2902 /T 70.6693 107.3/ 70.5375 n.a. n.a. 85.480634 166.10312 -52.09076 2026-Sep-02 10:10 18 30 24.84 +26 34 32.6 354.451118 31.911066 n.a. n.a. 1.009238252585 -0.0013511 0.00074890669302 -0.9979808 109.4190 /T 70.5407 107.4/ 70.4504 n.a. n.a. 87.179112 166.17158 -51.66427 2026-Sep-02 10:20 e 18 30 40.32 +26 20 17.0 351.861596 31.898371 n.a. n.a. 1.009238234560 -0.0076594 0.00074490561728 -0.9970961 109.5502 /T 70.4097 107.6/ 70.3641 n.a. n.a. 88.911701 166.18838 -51.23959 2026-Sep-02 10:30 18 30 56.07 +26 05 44.5 349.271807 31.795749 n.a. n.a. 1.009238190963 -0.0141035 0.00074090783923 -0.9963408 109.6839 /T 70.2763 107.7/ 70.2787 n.a. n.a. 90.677484 166.15563 -50.81819 2026-Sep-02 10:40 18 31 12.18 +25 50 54.9 346.688717 31.603696 n.a. n.a. 1.009238121241 -0.0206876 0.00073691278074 -0.9957444 109.8203 /T 70.1401 107.9/ 70.1940 n.a. n.a. 92.475772 166.07545 -50.40149 2026-Sep-02 10:50 18 31 28.68 +25 35 48.0 344.119067 31.323155 n.a. n.a. 1.009238024824 -0.0274158 0.00073291974441 -0.9953368 109.9597 /T 70.0010 108.0/ 70.1103 n.a. n.a. 94.306104 165.95000 -49.99080 2026-Sep-02 11:00 18 31 45.66 +25 20 23.9 341.569256 30.955494 n.a. n.a. 1.009237901126 -0.0342926 0.00072892791330 -0.9951478 110.1022 /T 69.8587 108.2/ 70.0275 n.a. n.a. 96.168244 165.78142 -49.58737 2026-Sep-02 11:10 18 32 03.16 +25 04 42.2 339.045224 30.502477 n.a. n.a. 1.009237749540 -0.0413226 0.00072493635083 -0.9952072 110.2482 /T 69.7130 108.3/ 69.9456 n.a. n.a. 98.062183 165.57189 -49.19237 2026-Sep-02 11:20 18 32 21.25 +24 48 43.1 336.552370 29.966227 n.a. n.a. 1.009237569444 -0.0485105 0.00072094400108 -0.9955447 110.3977 /T 69.5637 108.5/ 69.8647 n.a. n.a. 99.988132 165.32353 -48.80689 2026-Sep-02 11:30 18 32 39.99 +24 32 26.3 334.095478 29.349188 n.a. n.a. 1.009237360194 -0.0558614 0.00071694968910 -0.9961899 110.5511 /T 69.4106 108.6/ 69.7847 n.a. n.a. 101.94652 165.03849 -48.43195 2026-Sep-02 11:40 18 32 59.44 +24 15 51.7 331.678675 28.654075 n.a. n.a. 1.009237121126 -0.0633805 0.00071295212173 -0.9971722 110.7085 /T 69.2534 108.8/ 69.7058 n.a. n.a. 103.93799 164.71889 -48.06850 2026-Sep-02 11:50 18 33 19.66 +23 58 59.4 329.305402 27.883831 n.a. n.a. 1.009236851553 -0.0710734 0.00070894988850 -0.9985207 110.8702 /T 69.0920 108.9/ 69.6278 n.a. n.a. 105.96341 164.36682 -47.71740 2026-Sep-02 12:00 18 33 40.71 +23 41 49.2 326.978417 27.041577 n.a. n.a. 1.009236550768 -0.0789458 0.00070494146277 -1.0002641 111.0364 /T 68.9261 109.1/ 69.5509 n.a. n.a. 108.02382 163.98436 -47.37945 2026-Sep-02 12:10 18 34 02.66 +23 24 21.1 324.699805 26.130569 n.a. n.a. 1.009236218039 -0.0870037 0.00070092520321 -1.0024309 111.2073 /T 68.7554 109.2/ 69.4751 n.a. n.a. 110.12050 163.57357 -47.05538 2026-Sep-02 12:20 18 34 25.55 +23 06 35.0 322.471009 25.154154 n.a. n.a. 1.009235852609 -0.0952534 0.00069689935540 -1.0050490 111.3832 /T 68.5798 109.4/ 69.4003 n.a. n.a. 112.25489 163.13647 -46.74585 2026-Sep-02 12:30 18 34 49.45 +22 48 30.7 320.292871 24.115732 n.a. n.a. 1.009235453695 -0.1037016 0.00069286205370 -1.0081460 111.5642 /T 68.3990 109.5/ 69.3265 n.a. n.a. 114.42866 162.67506 -46.45144 2026-Sep-02 12:40 18 35 14.42 +22 30 08.3 318.165679 23.018721 n.a. n.a. 1.009235020489 -0.1123551 0.00068881132331 -1.0117487 111.7507 /T 68.2128 109.7/ 69.2539 n.a. n.a. 116.64365 162.19131 -46.17265 2026-Sep-02 12:50 18 35 40.51 +22 11 27.6 316.089221 21.866527 n.a. n.a. 1.009234552151 -0.1212213 0.00068474508253 -1.0158836 111.9427 /T 68.0210 109.8/ 69.1823 n.a. n.a. 118.90187 161.68717 -45.90995 2026-Sep-02 13:00 m 18 36 07.78 +21 52 28.6 314.062845 20.662519 n.a. n.a. 1.009234047814 -0.1303078 0.00068066114526 -1.0205763 112.1406 /T 67.8234 110.0/ 69.1118 n.a. n.a. 121.20555 161.16455 -45.66370 2026-Sep-02 13:10 m 18 36 36.29 +21 33 11.1 312.085507 19.410006 n.a. n.a. 1.009233506577 -0.1396227 0.00067655722350 -1.0258519 112.3446 /T 67.6197 110.1/ 69.0424 n.a. n.a. 123.55707 160.62532 -45.43420 2026-Sep-02 13:20 m 18 37 06.10 +21 13 35.1 310.155830 18.112226 n.a. n.a. 1.009232927509 -0.1491744 0.00067243093026 -1.0317347 112.5548 /T 67.4097 110.2/ 68.9741 n.a. n.a. 125.95899 160.07132 -45.22170 2026-Sep-02 13:30 m 18 37 37.26 +20 53 40.4 308.272152 16.772329 n.a. n.a. 1.009232309642 -0.1589717 0.00066827978234 -1.0382483 112.7716 /T 67.1932 110.4/ 68.9069 n.a. n.a. 128.41407 159.50436 -45.02637 2026-Sep-02 13:40 m 18 38 09.82 +20 33 26.9 306.432573 15.393370 n.a. n.a. 1.009231651972 -0.1690241 0.00066410120352 -1.0454155 112.9950 /T 66.9700 110.5/ 68.8408 n.a. n.a. 130.92524 158.92622 -44.84831 2026-Sep-02 13:50 m 18 38 43.84 +20 12 54.4 304.634994 13.978305 n.a. n.a. 1.009230953456 -0.1793413 0.00065989252763 -1.0532584 113.2254 /T 66.7399 110.6/ 68.7757 n.a. n.a. 133.49561 158.33861 -44.68757 2026-Sep-02 14:00 m 18 39 19.37 +19 52 02.7 302.877157 12.529986 n.a. n.a. 1.009230213011 -0.1899339 0.00065565100179 -1.0617982 113.4630 /T 66.5026 110.8/ 68.7117 n.a. n.a. 136.12848 157.74324 -44.54411 2026-Sep-02 14:10 m 18 39 56.47 +19 30 51.8 301.156671 11.051162 n.a. n.a. 1.009229429512 -0.2008126 0.00065137378985 -1.0710551 113.7080 /T 66.2579 110.9/ 68.6488 n.a. n.a. 138.82735 157.14174 -44.41787 2026-Sep-02 14:20 m 18 40 35.18 +19 09 21.2 299.471041 9.544482 n.a. n.a. 1.009228601788 -0.2119892 0.00064705797566 -1.0810488 113.9606 /T 66.0056 111.0/ 68.5869 n.a. n.a. 141.59592 156.53571 -44.30868 2026-Sep-02 14:30 m 18 41 15.57 +18 47 30.9 297.817689 8.012496 n.a. n.a. 1.009227728619 -0.2234759 0.00064270056659 -1.0917978 114.2211 /T 65.7454 111.1/ 68.5261 n.a. n.a. 144.43810 155.92670 -44.21636 2026-Sep-02 14:40 m 18 41 57.68 +18 25 20.5 296.193971 6.457663 n.a. n.a. 1.009226808737 -0.2352855 0.00063829849700 -1.1033199 114.4896 /T 65.4772 111.2/ 68.4662 n.a. n.a. 147.35803 155.31621 -44.14063 2026-Sep-02 14:50 m 18 42 41.56 +18 02 49.6 294.597188 4.882353 n.a. n.a. 1.009225840819 -0.2474317 0.00063384863165 -1.1156320 114.7664 /T 65.2007 111.3/ 68.4074 n.a. n.a. 150.36009 154.70569 -44.08120 2026-Sep-02 15:00 m 18 43 27.27 +17 39 58.0 293.024599 3.288859 n.a. n.a. 1.009224823486 -0.2599291 0.00062934776924 -1.1287503 115.0518 /T 64.9156 111.4/ 68.3495 n.a. n.a. 153.44893 154.09654 -44.03768 2026-Sep-02 15:10 m 18 44 14.86 +17 16 45.2 291.473423 1.679400 n.a. n.a. 1.009223755299 -0.2727929 0.00062479264577 -1.1426898 115.3459 /T 64.6218 111.5/ 68.2926 n.a. n.a. 156.62948 153.49009 -44.00966 2026-Sep-02 15:20 m 18 45 04.39 +16 53 10.9 289.940845 0.056132 n.a. n.a. 1.009222634756 -0.2860395 0.00062017993803 -1.1574649 115.6491 /T 64.3189 111.6/ 68.2365 n.a. n.a. 159.90697 152.88762 -43.99669 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< >..... Elevation Cut-off Requested .....< 2026-Sep-04 08:00 C 17 20 21.70 +44 01 51.3 5.760187 14.384377 n.a. n.a. 1.008522830393 0.2435369 0.00094309731224 0.0110368 90.0871 /T 89.8593 107.9/ 50.0087 n.a. n.a. 48.505577 160.65183 1.1389067 2026-Sep-04 08:10 C 17 20 36.33 +43 54 07.9 3.963985 14.689448 n.a. n.a. 1.008523806762 0.2433340 0.00094314566793 0.0130991 90.1505 /T 89.7959 108.1/ 49.8989 n.a. n.a. 49.399404 161.26778 1.3278587 2026-Sep-04 08:20 N 17 20 50.76 +43 46 14.5 2.150566 14.932090 n.a. n.a. 1.008524782256 0.2431001 0.00094320256817 0.0152940 90.2140 /T 89.7324 108.2/ 49.7892 n.a. n.a. 50.318624 161.79399 1.5225035 2026-Sep-04 08:30 N 17 21 05.06 +43 38 10.9 0.322781 15.111397 n.a. n.a. 1.008525756750 0.2428354 0.00094326850321 0.0176007 90.2778 /T 89.6686 108.3/ 49.6795 n.a. n.a. 51.259529 162.23382 1.7203186 2026-Sep-04 08:40 Nt 17 21 19.28 +43 29 57.1 358.483599 15.226631 n.a. n.a. 1.008526730120 0.2425397 0.00094334387929 0.0199981 90.3420 /T 89.6045 108.5/ 49.5700 n.a. n.a. 52.218692 162.59087 1.9189651 2026-Sep-04 08:50 A 17 21 33.48 +43 21 33.2 356.636072 15.277234 n.a. n.a. 1.008527702242 0.2422133 0.00094342901734 0.0224648 90.4067 /T 89.5397 108.6/ 49.4606 n.a. n.a. 53.192968 162.86886 2.1162817 2026-Sep-04 09:00 Ae 17 21 47.71 +43 12 59.4 354.783310 15.262833 n.a. n.a. 1.008528672993 0.2418560 0.00094352415186 0.0249791 90.4723 /T 89.4741 108.7/ 49.3515 n.a. n.a. 54.179480 163.07157 2.3102761 2026-Sep-04 09:10 17 22 02.03 +43 04 15.5 352.928448 15.183246 n.a. n.a. 1.008529642249 0.2414679 0.00094362943000 0.0275192 90.5387 /T 89.4077 108.9/ 49.2426 n.a. n.a. 55.175617 163.20279 2.4991142 2026-Sep-04 09:20 17 22 16.49 +42 55 21.9 351.074609 15.038478 n.a. n.a. 1.008530609887 0.2410490 0.00094374491079 0.0300629 90.6063 /T 89.3401 109.0/ 49.1341 n.a. n.a. 56.179015 163.26629 2.6811092 2026-Sep-04 09:30 17 22 31.15 +42 46 18.5 349.224876 14.828727 n.a. n.a. 1.008531575783 0.2405993 0.00094387056467 0.0325882 90.6751 /T 89.2713 109.1/ 49.0259 n.a. n.a. 57.187553 163.26576 2.8547103 2026-Sep-04 09:40 17 22 46.07 +42 37 05.5 347.382260 14.554374 n.a. n.a. 1.008532539814 0.2401187 0.00094400627310 0.0350728 90.7453 /T 89.2010 109.3/ 48.9182 n.a. n.a. 58.199328 163.20482 3.0184913 2026-Sep-04 09:50 17 23 01.29 +42 27 43.0 345.549666 14.215980 n.a. n.a. 1.008533501855 0.2396074 0.00094415182844 0.0374945 90.8172 /T 89.1292 109.4/ 48.8110 n.a. n.a. 59.212652 163.08696 3.1711402 2026-Sep-04 10:00 17 23 16.87 +42 18 11.3 343.729869 13.814280 n.a. n.a. 1.008534461784 0.2390651 0.00094430693402 0.0398312 90.8907 /T 89.0557 109.6/ 48.7043 n.a. n.a. 60.226028 162.91560 3.3114498 2026-Sep-04 10:10 17 23 32.84 +42 08 30.5 341.925489 13.350168 n.a. n.a. 1.008535419476 0.2384919 0.00094447120442 0.0420607 90.9661 /T 88.9802 109.7/ 48.5982 n.a. n.a. 61.238142 162.69399 3.4383084 2026-Sep-04 10:20 17 23 49.27 +41 58 40.8 340.138968 12.824687 n.a. n.a. 1.008536374807 0.2378878 0.00094464416595 0.0441612 91.0436 /T 88.9027 109.9/ 48.4927 n.a. n.a. 62.247847 162.42529 3.5506922 2026-Sep-04 10:30 17 24 06.20 +41 48 42.4 338.372559 12.239018 n.a. n.a. 1.008537327652 0.2372526 0.00094482525729 0.0461109 91.1233 /T 88.8231 110.0/ 48.3879 n.a. n.a. 63.254148 162.11252 3.6476579 2026-Sep-04 10:40 17 24 23.67 +41 38 35.6 336.628304 11.594466 n.a. n.a. 1.008538277888 0.2365863 0.00094501383034 0.0478883 91.2052 /T 88.7411 110.2/ 48.2838 n.a. n.a. 64.256190 161.75858 3.7283368 2026-Sep-04 10:50 17 24 41.73 +41 28 20.6 334.908037 10.892440 n.a. n.a. 1.008539225388 0.2358888 0.00094520915137 0.0494722 91.2896 /T 88.6567 110.3/ 48.1805 n.a. n.a. 65.253243 161.36626 3.7919292 2026-Sep-04 11:00 17 25 00.41 +41 17 57.6 333.213368 10.134446 n.a. n.a. 1.008540170029 0.2351601 0.00094541040219 0.0508417 91.3766 /T 88.5697 110.5/ 48.0780 n.a. n.a. 66.244695 160.93821 3.8376999 2026-Sep-04 11:10 17 25 19.76 +41 07 27.0 331.545692 9.322065 n.a. n.a. 1.008541111683 0.2343999 0.00094561668161 0.0519762 91.4663 /T 88.4800 110.7/ 47.9763 n.a. n.a. 67.230032 160.47700 3.8649742 2026-Sep-04 11:20 17 25 39.81 +40 56 48.9 329.906184 8.456941 n.a. n.a. 1.008542050226 0.2336083 0.00094582700709 0.0528559 91.5588 /T 88.3875 110.8/ 47.8755 n.a. n.a. 68.208835 159.98506 3.8731343 2026-Sep-04 11:30 17 26 00.60 +40 46 03.7 328.295809 7.540769 n.a. n.a. 1.008542985531 0.2327850 0.00094604031648 0.0534609 91.6543 /T 88.2920 111.0/ 47.7757 n.a. n.a. 69.180761 159.46475 3.8616165 2026-Sep-04 11:40 17 26 22.16 +40 35 11.7 326.715329 6.575278 n.a. n.a. 1.008543917469 0.2319300 0.00094625547005 0.0537723 91.7528 /T 88.1935 111.1/ 47.6768 n.a. n.a. 70.145541 158.91830 3.8299089 2026-Sep-04 11:50 17 26 44.52 +40 24 13.1 325.165311 5.562220 n.a. n.a. 1.008544845915 0.2310431 0.00094647125259 0.0537714 91.8544 /T 88.0919 111.3/ 47.5789 n.a. n.a. 71.102964 158.34787 3.7775492 2026-Sep-04 12:00 17 27 07.71 +40 13 08.3 323.646143 4.503356 n.a. n.a. 1.008545770740 0.2301242 0.00094668637564 0.0534405 91.9593 /T 87.9870 111.5/ 47.4820 n.a. n.a. 72.052869 157.75552 3.7041229 2026-Sep-04 12:10 17 27 31.77 +40 01 57.6 322.158040 3.400451 n.a. n.a. 1.008546691815 0.2291731 0.00094689948004 0.0527620 92.0675 /T 87.8788 111.6/ 47.3862 n.a. n.a. 72.995140 157.14323 3.6092622 2026-Sep-04 12:20 17 27 56.70 +39 50 41.2 320.701066 2.255258 n.a. n.a. 1.008547609010 0.2281897 0.00094710913838 0.0517194 92.1791 /T 87.7671 111.8/ 47.2915 n.a. n.a. 73.929693 156.51290 3.4926442 2026-Sep-04 12:30 17 28 22.55 +39 39 19.6 319.275140 1.069512 n.a. n.a. 1.008548522195 0.2271737 0.00094731385778 0.0502966 92.2943 /T 87.6520 112.0/ 47.1979 n.a. n.a. 74.856473 155.86635 3.3539903 2026-Sep-04 12:40 17 28 49.32 +39 27 53.0 317.880054 -0.155075 n.a. n.a. 1.008549431241 0.2261250 0.00094751208266 0.0484785 92.4130 /T 87.5333 112.1/ 47.1055 n.a. n.a. 75.775442 155.20533 3.1930653 >..... Elevation Cut-off Requested .....< $$EOE *************************************************************************************************************************************************************************************************************************************************** Column meaning: TIME Times PRIOR to 1962 are UT1, a mean-solar time closely related to the prior but now-deprecated GMT. Times AFTER 1962 are in UTC, the current civil or "wall-clock" time-scale. UTC is kept within 0.9 seconds of UT1 using integer leap-seconds for 1972 and later years. Conversion from the internal Barycentric Dynamical Time (TDB) of solar system dynamics to the non-uniform civil UT time-scale requested for output has not been determined for UTC times after the next July or January 1st. Therefore, the last known leap-second is used as a constant over future intervals. Time tags refer to the UT time-scale conversion from TDB on Earth regardless of observer location within the solar system, although clock rates may differ due to the local gravity field and no analog to "UT" may be defined for that location. Any 'b' symbol in the 1st-column denotes a B.C. date. First-column blank (" ") denotes an A.D. date. CALENDAR SYSTEM Mixed calendar mode was active such that calendar dates after AD 1582-Oct-15 (if any) are in the modern Gregorian system. Dates prior to 1582-Oct-5 (if any) are in the Julian calendar system, which is automatically extended for dates prior to its adoption on 45-Jan-1 BC. The Julian calendar is useful for matching historical dates. The Gregorian calendar more accurately corresponds to the Earth's orbital motion and seasons. A "Gregorian-only" calendar mode is available if such physical events are the primary interest. NOTE: "n.a." in output means quantity "not available" at the print-time. SOLAR PRESENCE (OBSERVING SITE) Time tag is followed by a blank, then a solar-presence condition code: '*' Daylight (refracted solar upper-limb on or above apparent horizon) 'C' Civil twilight/dawn 'N' Nautical twilight/dawn 'A' Astronomical twilight/dawn ' ' Night OR geocentric ephemeris LUNAR PRESENCE WITH TARGET RISE/TRANSIT/SET EVENT MARKER (OBSERVING SITE) The solar-presence code column is immediately followed by another marker: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric The lunar presence marker (an ongoing state) can be over-ridden by a target event marker if an event has occurred since the last output step: 'r' Rise (target body on or went above cut-off RTS elevation) 'e' Elevation max (target body maximum elevation angle has occurred) 't' Transit (target body at or passed through observer meridian) 's' Set (target body on or went below cut-off RTS elevation) RTS MARKERS (TVH) Rise and set are with respect to the reference ellipsoid true visual horizon defined by the elevation cut-off angle. Horizon dip and yellow-light refraction (Earth only) are considered. Accuracy is < or = to twice the requested search step-size. 'R.A._____(ICRF)_____DEC' = Astrometric right ascension and declination of the target center with respect to the observing site (coordinate origin) in the reference frame of the planetary ephemeris (ICRF). Compensated for down-leg light-time delay aberration. Units: RA in hours-minutes-seconds of time, HH MM SS.ff{ffff} DEC in degrees-minutes-seconds of arc, sDD MN SC.f{ffff} 'Azi____(a-app)___Elev' = Airless apparent azimuth and elevation of target center. Compensated for light-time, the gravitational deflection of light, stellar aberration, precession and nutation. Azimuth is measured clockwise from north: North(0) -> East(90) -> South(180) -> West(270) -> North (360) Elevation angle is with respect to a plane perpendicular to the reference surface local zenith direction. TOPOCENTRIC ONLY. Units: DEGREES 'APmag S-brt' = The targets' approximate apparent visual magnitude and surface brightness. For planets and natural satellites, output is restricted to solar phase angles covered by observational data. Outside the observed phase angle range, "n.a." may be output to avoid extrapolation beyond the limit of model validity. For Earth-based observers, the estimated dimming due to atmospheric absorption (extinction) is available as a separate, requestable quantity. Surface brightness is the average airless visual magnitude of a square-arcsecond of the illuminated portion of the apparent disk. It is computed only if the target radius is known. Units: MAGNITUDES & MAGNITUDES PER SQUARE ARCSECOND 'r rdot' = The Sun's apparent range ("r", light-time aberrated) and range-rate ("rdot") relative to the target center, as seen by the observer. A positive "rdot" means the target center was moving away from the Sun, negative means moving toward the Sun. Units: AU and KM/S 'delta deldot' = Apparent range ("delta", light-time aberrated) and range-rate ("delta-dot") of the target center relative to the observer. A positive "deldot" means the target center is moving away from the observer, negative indicates movement toward the observer. Units: AU and KM/S 'S-O-T /r' = Sun-Observer-Target apparent SOLAR ELONGATION ANGLE seen from the observers' location at print-time. The '/r' column provides a code indicating the targets' apparent position relative to the Sun in the observers' sky, as described below: Case A: For an observing location on the surface of a rotating body, that body rotational sense is considered: /T indicates target TRAILS Sun (evening sky: rises and sets AFTER Sun) /L indicates target LEADS Sun (morning sky: rises and sets BEFORE Sun) Case B: For an observing point that does not have a rotational model (such as a spacecraft), the "leading" and "trailing" condition is defined by the observers' heliocentric ORBITAL motion: * If continuing in the observers' current direction of heliocentric motion would encounter the targets' apparent longitude first, followed by the Sun's, the target LEADS the Sun as seen by the observer. * If the Sun's apparent longitude would be encountered first, followed by the targets', the target TRAILS the Sun. Two other codes can be output: /* indicates observer is Sun-centered (undefined) /? Target is aligned with Sun center (no lead or trail) The S-O-T solar elongation angle is numerically the minimum separation angle of the Sun and target in the sky in any direction. It does NOT indicate the amount of separation in the leading or trailing directions, which would be defined along the equator of a spherical coordinate system. Units: DEGREES 'S-T-O' = The Sun-Target-Observer angle; the interior vertex angle at target center formed by a vector from the target to the apparent center of the Sun (at reflection time on the target) and the apparent vector from target to the observer at print-time. Slightly different from true PHASE ANGLE (requestable separately) at the few arcsecond level in that it includes stellar aberration on the down-leg from target to observer. Units: DEGREES 'T-O-M/MN_Illu%' = Target-Observer-Moon LUNAR ELONGATION angle and illuminated percentage. The apparent lunar elongation angle between target body center and Moon center, seen from the observing site, along with fraction of the lunar disk illuminated by the Sun. A negative lunar elongation angle indicates the target center is behind the Moon. Units: DEGREES & PERCENT 'RA_3sigma DEC_3sigma' = Uncertainty in Right-Ascension and Declination. Output values are the formal +/- 3 standard-deviations (sigmas) around nominal position. Units: ARCSECONDS 'Sky_motion Sky_mot_PA RelVel-ANG' = Total apparent angular rate of the target in the plane-of-sky. "Sky_mot_PA" is the position angle of the target's direction of motion in the plane-of-sky, measured counter-clockwise from the apparent of-date north pole direction. "RelVel-ANG" is the flight path angle of the target's relative motion with respect to the observer's line-of-sight, in the range [-90,+90], where positive values indicate motion away from the observer, negative values are toward the observer: -90 = target is moving directly toward the observer 0 = target is moving at right angles to the observer's line-of-sight +90 = target is moving directly away from the observer UNITS: ARCSECONDS/MINUTE, DEGREES, DEGREES Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA General site: https://ssd.jpl.nasa.gov/ Mailing list: https://ssd.jpl.nasa.gov/email_list.html System news : https://ssd.jpl.nasa.gov/horizons/news.html User Guide : https://ssd.jpl.nasa.gov/horizons/manual.html Connect : browser https://ssd.jpl.nasa.gov/horizons/app.html#/x API https://ssd-api.jpl.nasa.gov/doc/horizons.html command-line telnet ssd.jpl.nasa.gov 6775 e-mail/batch https://ssd.jpl.nasa.gov/ftp/ssd/horizons_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Inquiries : Jon.D.Giorgini@jpl.nasa.gov ***************************************************************************************************************************************************************************************************************************************************