******************************************************************************* JPL/HORIZONS 141P/Machholz 2 2020-Dec-09 20:37:31 Rec #:90001029 (+COV) Soln.date: 2020-Aug-25_12:04:35 # obs: 264 (2005-2020) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457102.5 ! 2015-Mar-21.0000000 (TDB) RMSW= n.a. EC= .748198785637231 QR= .7608118290269178 TP= 2457259.5197989587 OM= 246.0208795754483 W= 149.4764177467125 IN= 12.81038012288554 A= 3.021477997841659 MA= 330.5334468841493 ADIST= 5.2821441666564 PER= 5.2521529939712 N= .187661381 ANGMOM= .019838804 DAN= 3.74149 DDN= .8087800000000001 L= 36.1252527 B= 6.4659444 MOID= .102968 TP= 2015-Aug-25.0197989587 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 14.9 M2= 18.9 k1= 22. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 4.257798790932E-9 A2= 3.054697066545E-10 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 COMET comments 1: soln ref.= JPL#K204/1, data arc: 2005-03-16 to 2020-08-16 2: k1=22., k2=5., phase coef.=0.03; ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Wed Dec 9 20:37:31 2020 Pasadena, USA / Horizons ******************************************************************************* Target body name: 141P/Machholz 2 {source: JPL#K204/1} Center body name: Earth (399) {source: DE431} Center-site name: Xingming Observatory, Nanshan ******************************************************************************* Start time : A.D. 2020-Dec-10 00:00:00.0000 UT Stop time : A.D. 2020-Dec-22 00:00:00.0000 UT Step-size : 30 minutes ******************************************************************************* Target pole/equ : No model available Target radii : (unavailable) Center geodetic : 87.1732000,43.4717611,2.0429181 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 87.1732000,4637.53399,4367.0910 {E-lon(deg),Dxy(km),Dz(km)} Center pole/equ : High-precision EOP model {East-longitude positive} Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole} Target primary : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE431} Rel. light bend : Sun, EARTH {source: DE431} Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2 Small-body perts: Yes {source: SB431-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : BOTH RTS-only print : NO EOP file : eop.201209.p210302 EOP coverage : DATA-BASED 1962-JAN-20 TO 2020-DEC-09. PREDICTS-> 2021-MAR-01 Units conversion: 1 au= 149597870.700 km, c= 299792.458 km/s, 1 day= 86400.0 s Table cut-offs 1: Elevation ( 15.0deg=YES),Airmass (>38.000=NO), Daylight (YES) Table cut-offs 2: Solar elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2457102.5 ! 2015-Mar-21.0000000 (TDB) RMSW= n.a. EC= .748198785637231 QR= .7608118290269178 TP= 2457259.5197989587 OM= 246.0208795754483 W= 149.4764177467125 IN= 12.81038012288554 Equivalent ICRF heliocentric equatorial cartesian coordinates (au, au/d): X= 8.305848125317339E-02 Y=-2.128266804589662E+00 Z=-6.799913681651955E-01 VX= 8.334433832522086E-03 VY= 8.691310384504408E-03 VZ= 4.665362760357889E-03 Comet physical (GM= km^3/s^2; RAD= km): GM= n.a. RAD= n.a. M1= 14.9 M2= 18.9 k1= 22. k2= 5. PHCOF= .030 Comet non-gravitational force model (AMRAT=m^2/kg;A1-A3=au/d^2;DT=days;R0=au): AMRAT= 0. DT= 0. A1= 4.257798790932E-9 A2= 3.054697066545E-10 A3= 0. Standard model: ALN= .1112620426 NK= 4.6142 NM= 2.15 NN= 5.093 R0= 2.808 ********************************************************************************************************************************************************************************************************* Date__(UT)__HR:MN Date_________JDUT R.A._____(ICRF)_____DEC Azi_(a-appr)_Elev r delta S-O-T /r PsAng PsAMV PlAng RA_3sigma DEC_3sigma phi PAB-LON PAB-LAT ********************************************************************************************************************************************************************************************************* $$SOE >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-10 11:00 2459193.958333333 C 20 43 44.01 -09 35 30.6 204.6753 33.7950 0.813547053564 0.81903702876856 52.6495 /T 68.382 272.048 4.80650 4.017 0.622 74.1877 348.2986 10.3947 2020-Dec-10 11:30 2459193.979166667 N 20 43 49.74 -09 35 26.6 212.8752 31.1757 0.813507117157 0.81881084970042 52.6510 /T 68.379 272.073 4.81362 4.020 0.623 74.2020 348.3286 10.3879 2020-Dec-10 12:00 2459194.000000000 A 20 43 55.48 -09 35 22.6 220.5117 27.9247 0.813467321238 0.81858514062618 52.6525 /T 68.376 272.098 4.82074 4.023 0.625 74.2163 348.3585 10.3812 2020-Dec-10 12:30 2459194.020833333 20 44 01.22 -09 35 18.5 227.5848 24.1424 0.813427665837 0.81835986559096 52.6540 /T 68.374 272.124 4.82787 4.026 0.626 74.2305 348.3885 10.3744 2020-Dec-10 13:00 2459194.041666667 20 44 06.98 -09 35 14.4 234.1373 19.9236 0.813388150983 0.81813498137288 52.6556 /T 68.371 272.149 4.83500 4.029 0.628 74.2447 348.4185 10.3676 2020-Dec-10 13:30 2459194.062500000 20 44 12.74 -09 35 10.4 240.2373 15.3526 0.813348776704 0.81791043822379 52.6571 /T 68.368 272.174 4.84215 4.032 0.629 74.2589 348.4485 10.3608 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-11 11:00 2459194.958333333 C 20 48 24.36 -09 32 20.8 204.4894 33.9019 0.811789071164 0.80811292890458 52.7389 /T 68.248 273.248 5.15719 4.176 0.692 74.8582 349.7468 10.0588 2020-Dec-11 11:30 2459194.979166667 N 20 48 30.18 -09 32 16.7 212.7074 31.2974 0.811755910161 0.80788727062567 52.7407 /T 68.245 273.273 5.16447 4.180 0.693 74.8723 349.7769 10.0517 2020-Dec-11 12:00 2459195.000000000 A 20 48 36.01 -09 32 12.6 220.3615 28.0587 0.811722890977 0.80766208776010 52.7425 /T 68.243 273.297 5.17175 4.183 0.695 74.8864 349.8071 10.0446 2020-Dec-11 12:30 2459195.020833333 20 48 41.85 -09 32 08.6 227.4506 24.2863 0.811690013636 0.80743734454069 52.7444 /T 68.240 273.322 5.17904 4.186 0.696 74.9004 349.8373 10.0375 2020-Dec-11 13:00 2459195.041666667 20 48 47.70 -09 32 04.5 234.0170 20.0754 0.811657278164 0.80721299791703 52.7462 /T 68.238 273.347 5.18634 4.190 0.698 74.9144 349.8675 10.0304 2020-Dec-11 13:30 2459195.062500000 20 48 53.55 -09 32 00.4 240.1284 15.5105 0.811624684584 0.80698899829332 52.7480 /T 68.235 273.371 5.19365 4.193 0.699 74.9284 349.8977 10.0232 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-12 11:00 2459195.958333333 C 20 53 09.23 -09 29 09.5 204.2817 34.0144 0.810357725275 0.79721961882927 52.8436 /T 68.125 274.415 5.51590 4.345 0.768 75.5179 351.2044 9.7066 2020-Dec-12 11:30 2459195.979166667 N 20 53 15.15 -09 29 05.4 212.5193 31.4266 0.810331398025 0.79699470440791 52.8458 /T 68.123 274.439 5.52335 4.349 0.770 75.5318 351.2348 9.6992 2020-Dec-12 12:00 2459196.000000000 A 20 53 21.08 -09 29 01.3 220.1925 28.2016 0.810305213685 0.79677027101974 52.8479 /T 68.121 274.463 5.53080 4.352 0.771 75.5456 351.2651 9.6917 2020-Dec-12 12:30 2459196.020833333 20 53 27.01 -09 28 57.2 227.2991 24.4405 0.810279172276 0.79654628310513 52.8501 /T 68.118 274.486 5.53826 4.356 0.773 75.5594 351.2955 9.6843 2020-Dec-12 13:00 2459196.041666667 20 53 32.95 -09 28 53.1 233.8806 20.2384 0.810253273818 0.79632269780345 52.8522 /T 68.116 274.510 5.54572 4.359 0.775 75.5732 351.3259 9.6768 2020-Dec-12 13:30 2459196.062500000 20 53 38.90 -09 28 48.9 240.0045 15.6805 0.810227518330 0.79609946568753 52.8544 /T 68.114 274.534 5.55320 4.363 0.776 75.5869 351.3563 9.6693 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-13 11:00 2459196.958333333 C 20 57 58.75 -09 25 56.8 204.0515 34.1326 0.809255544469 0.78636801019736 52.9642 /T 68.015 275.542 5.88277 4.524 0.850 76.1648 352.6710 9.3379 2020-Dec-13 11:30 2459196.979166667 N 20 58 04.76 -09 25 52.7 212.3101 31.5632 0.809236097673 0.78614406894111 52.9667 /T 68.013 275.565 5.89039 4.528 0.852 76.1784 352.7015 9.3302 2020-Dec-13 12:00 2459197.000000000 A 20 58 10.79 -09 25 48.6 220.0040 28.3537 0.809216794633 0.78592061454826 52.9692 /T 68.011 275.588 5.89801 4.531 0.854 76.1920 352.7321 9.3224 2020-Dec-13 12:30 2459197.020833333 20 58 16.82 -09 25 44.5 227.1296 24.6050 0.809197635365 0.78569761168730 52.9717 /T 68.008 275.611 5.90563 4.535 0.855 76.2055 352.7626 9.3146 2020-Dec-13 13:00 2459197.041666667 20 58 22.86 -09 25 40.3 233.7276 20.4129 0.809178619883 0.78547501770624 52.9742 /T 68.006 275.634 5.91327 4.539 0.857 76.2190 352.7932 9.3068 2020-Dec-13 13:30 2459197.062500000 20 58 28.90 -09 25 36.1 239.8652 15.8628 0.809159748200 0.78525278336365 52.9767 /T 68.004 275.657 5.92092 4.543 0.859 76.2324 352.8238 9.2989 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-14 11:00 2459197.958333333 C 21 02 53.04 -09 22 42.8 203.7980 34.2563 0.808484489867 0.77556932704830 53.1013 /T 67.916 276.624 6.25791 4.713 0.937 76.7969 354.1460 8.9527 2020-Dec-14 11:30 2459197.979166667 N 21 02 59.15 -09 22 38.7 212.0790 31.7075 0.808471958237 0.77534659497299 53.1041 /T 67.914 276.647 6.26570 4.717 0.939 76.8102 354.1767 8.9445 2020-Dec-14 12:00 2459198.000000000 A 21 03 05.27 -09 22 34.6 219.7954 28.5150 0.808459570957 0.77512435581155 53.1070 /T 67.912 276.669 6.27349 4.721 0.941 76.8234 354.2074 8.9364 2020-Dec-14 12:30 2459198.020833333 21 03 11.40 -09 22 30.4 226.9415 24.7802 0.808447328035 0.77490257448171 53.1098 /T 67.910 276.691 6.28129 4.725 0.943 76.8366 354.2381 8.9283 2020-Dec-14 13:00 2459198.041666667 21 03 17.54 -09 22 26.2 233.5575 20.5991 0.808435229481 0.77468120855978 53.1126 /T 67.908 276.713 6.28910 4.729 0.945 76.8497 354.2689 8.9201 2020-Dec-14 13:30 2459198.062500000 21 03 23.69 -09 22 22.0 239.7100 16.0577 0.808423275304 0.77446020900763 53.1155 /T 67.907 276.735 6.29692 4.733 0.947 76.8628 354.2996 8.9119 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-15 11:00 2459198.958333333 Cm 21 07 52.22 -09 19 27.5 203.5203 34.3857 0.808045940670 0.76483512723200 53.2554 /T 67.829 277.657 6.64142 4.914 1.029 77.4121 355.6289 8.5507 2020-Dec-15 11:30 2459198.979166667 N 21 07 58.44 -09 19 23.3 211.8254 31.8593 0.808040346670 0.76461384745182 53.2586 /T 67.827 277.679 6.64938 4.918 1.031 77.4249 355.6597 8.5422 2020-Dec-15 12:00 2459199.000000000 A 21 08 04.66 -09 19 19.2 219.5657 28.6856 0.808034897356 0.76439306686242 53.2618 /T 67.826 277.700 6.65735 4.923 1.033 77.4378 355.6906 8.5337 2020-Dec-15 12:30 2459199.020833333 21 08 10.90 -09 19 15.0 226.7341 24.9661 0.808029592730 0.76417275065262 53.2650 /T 67.824 277.721 6.66532 4.927 1.035 77.4506 355.7214 8.5253 2020-Dec-15 13:00 2459199.041666667 21 08 17.14 -09 19 10.8 233.3695 20.7972 0.808024432797 0.76395285664715 53.2682 /T 67.823 277.741 6.67330 4.931 1.037 77.4634 355.7523 8.5168 2020-Dec-15 13:30 2459199.062500000 21 08 23.39 -09 19 06.5 239.5382 16.2655 0.808019417561 0.76373333602939 53.2713 /T 67.821 277.762 6.68129 4.935 1.039 77.4761 355.7832 8.5082 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-16 11:00 2459199.958333333 Cm 21 12 56.44 -09 16 10.8 203.2178 34.5207 0.807940683888 0.75417731618116 53.4271 /T 67.754 278.637 7.03336 5.127 1.125 78.0081 357.1191 8.1320 2020-Dec-16 11:30 2459199.979166667 Nm 21 13 02.76 -09 16 06.6 211.5484 32.0188 0.807942037568 0.75395773906358 53.4307 /T 67.753 278.656 7.04150 5.131 1.127 78.0205 357.1501 8.1232 2020-Dec-16 12:00 2459200.000000000 Am 21 13 09.09 -09 16 02.4 219.3145 28.8656 0.807943536008 0.75373866764020 53.4343 /T 67.752 278.676 7.04964 5.136 1.129 78.0330 357.1811 8.1144 2020-Dec-16 12:30 2459200.020833333 21 13 15.43 -09 15 58.2 226.5068 25.1629 0.807945179208 0.75352006739327 53.4378 /T 67.750 278.696 7.05778 5.140 1.131 78.0453 357.2121 8.1056 2020-Dec-16 13:00 2459200.041666667 21 13 21.78 -09 15 53.9 233.1631 21.0076 0.807946967165 0.75330189641666 53.4414 /T 67.749 278.716 7.06594 5.145 1.133 78.0577 357.2431 8.0967 2020-Dec-16 13:30 2459200.062500000 21 13 28.13 -09 15 49.7 239.3494 16.4866 0.807948899879 0.75308410613403 53.4449 /T 67.748 278.736 7.07411 5.149 1.135 78.0700 357.2742 8.0878 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-17 11:00 2459200.958333333 Cm 21 18 05.82 -09 12 52.5 202.8895 34.6612 0.808168908447 0.74360814723777 53.6171 /T 67.692 279.558 7.43378 5.352 1.224 78.5828 358.6162 7.6967 2020-Dec-17 11:30 2459200.979166667 Nm 21 18 12.26 -09 12 48.3 211.2473 32.1860 0.808177207364 0.74339053025011 53.6211 /T 67.691 279.577 7.44209 5.357 1.226 78.5948 358.6473 7.6875 2020-Dec-17 12:00 2459201.000000000 Am 21 18 18.69 -09 12 44.1 219.0408 29.0553 0.808185650858 0.74317342567991 53.6250 /T 67.690 279.595 7.45041 5.362 1.228 78.6068 358.6785 7.6784 2020-Dec-17 12:30 2459201.020833333 m 21 18 25.14 -09 12 39.8 226.2587 25.3710 0.808194238920 0.74295679932584 53.6290 /T 67.688 279.614 7.45873 5.367 1.231 78.6187 358.7096 7.6692 2020-Dec-17 13:00 2459201.041666667 m 21 18 31.59 -09 12 35.5 232.9377 21.2304 0.808202971545 0.74274060957236 53.6329 /T 67.687 279.632 7.46706 5.371 1.233 78.6306 358.7408 7.6600 2020-Dec-17 13:30 2459201.062500000 21 18 38.06 -09 12 31.3 239.1430 16.7210 0.808211848726 0.74252480810265 53.6369 /T 67.686 279.651 7.47540 5.376 1.235 78.6425 358.7720 7.6508 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-18 11:00 2459201.958333333 Cm 21 23 20.51 -09 09 32.6 202.5345 34.8071 0.808730203766 0.73314020760489 53.8261 /T 67.641 280.418 7.84270 5.591 1.327 79.1341 0.1198 7.2448 2020-Dec-18 11:30 2459201.979166667 Nm 21 23 27.06 -09 09 28.4 210.9210 32.3609 0.808745433007 0.73292481488755 53.8304 /T 67.640 280.436 7.85118 5.596 1.329 79.1456 0.1510 7.2353 2020-Dec-18 12:00 2459202.000000000 Am 21 23 33.60 -09 09 24.1 218.7438 29.2546 0.808760806379 0.73270994151919 53.8348 /T 67.640 280.453 7.85967 5.601 1.331 79.1570 0.1823 7.2258 2020-Dec-18 12:30 2459202.020833333 m 21 23 40.16 -09 09 19.8 225.9893 25.5904 0.808776323872 0.73249555363869 53.8391 /T 67.639 280.471 7.86817 5.606 1.333 79.1685 0.2136 7.2163 2020-Dec-18 13:00 2459202.041666667 m 21 23 46.73 -09 09 15.5 232.6926 21.4659 0.808791985473 0.73228160994304 53.8435 /T 67.638 280.488 7.87668 5.611 1.335 79.1798 0.2449 7.2067 2020-Dec-18 13:30 2459202.062500000 m 21 23 53.30 -09 09 11.2 238.9183 16.9693 0.808807791171 0.73206806239514 53.8478 /T 67.637 280.505 7.88520 5.616 1.338 79.1912 0.2762 7.1972 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-19 11:00 2459202.958333333 Cm 21 28 40.65 -09 06 10.8 202.1520 34.9585 0.809623562833 0.72278639351224 54.0547 /T 67.603 281.216 8.26009 5.844 1.432 79.6597 1.6294 6.7765 2020-Dec-19 11:30 2459202.979166667 Nm 21 28 47.30 -09 06 06.5 210.5688 32.5437 0.809645695121 0.72257349528462 54.0594 /T 67.602 281.232 8.26875 5.850 1.434 79.6706 1.6608 6.7666 2020-Dec-19 12:00 2459203.000000000 Am 21 28 53.97 -09 06 02.2 218.4228 29.4638 0.809667970842 0.72236112353174 54.0642 /T 67.602 281.248 8.27741 5.855 1.437 79.6815 1.6921 6.7568 2020-Dec-19 12:30 2459203.020833333 m 21 29 00.64 -09 05 57.9 225.6977 25.8213 0.809690389979 0.72214924475716 54.0689 /T 67.601 281.264 8.28608 5.860 1.439 79.6924 1.7235 6.7469 2020-Dec-19 13:00 2459203.041666667 m 21 29 07.32 -09 05 53.5 232.4271 21.7144 0.809712952514 0.72193781799338 54.0737 /T 67.601 281.280 8.29476 5.866 1.441 79.7032 1.7550 6.7371 2020-Dec-19 13:30 2459203.062500000 m 21 29 14.01 -09 05 49.1 238.6747 17.2316 0.809735658431 0.72172679550370 54.0785 /T 67.600 281.296 8.30346 5.871 1.443 79.7140 1.7864 6.7272 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-20 11:00 2459203.958333333 Cm 21 34 06.36 -09 02 46.8 201.7410 35.1152 0.810847389726 0.71255988010796 54.3036 /T 67.577 281.948 8.68589 6.112 1.540 80.1574 3.1447 6.2920 2020-Dec-20 11:30 2459203.979166667 Nm 21 34 13.14 -09 02 42.4 210.1898 32.7342 0.810876385629 0.71234975202154 54.3088 /T 67.576 281.963 8.69473 6.118 1.542 80.1677 3.1762 6.2818 2020-Dec-20 12:00 2459204.000000000 Am 21 34 19.92 -09 02 38.1 218.0770 29.6830 0.810905524014 0.71214015771545 54.3140 /T 67.576 281.977 8.70356 6.124 1.544 80.1780 3.2077 6.2716 2020-Dec-20 12:30 2459204.020833333 m 21 34 26.70 -09 02 33.7 225.3832 26.0640 0.810934804860 0.71193106408328 54.3191 /T 67.576 281.992 8.71241 6.129 1.547 80.1883 3.2392 6.2615 2020-Dec-20 13:00 2459204.041666667 m 21 34 33.50 -09 02 29.3 232.1405 21.9760 0.810964228146 0.71172243051670 54.3243 /T 67.575 282.006 8.72126 6.135 1.549 80.1985 3.2707 6.2512 2020-Dec-20 13:30 2459204.062500000 m 21 34 40.31 -09 02 24.8 238.4118 17.5084 0.810993793847 0.71151420960118 54.3295 /T 67.575 282.021 8.73012 6.140 1.551 80.2087 3.3023 6.2410 >..... Elevation Cut-off Requested .....< >..... Daylight Cut-off Requested .....< 2020-Dec-21 11:00 2459204.958333333 Cm 21 39 37.81 -08 59 20.1 201.3006 35.2772 0.812399511453 0.70247409088023 54.5736 /T 67.562 282.614 9.12001 6.396 1.649 80.6250 4.6653 5.7917 2020-Dec-21 11:30 2459204.979166667 Nm 21 39 44.70 -08 59 15.7 209.7831 32.9325 0.812435319671 0.70226701339973 54.5792 /T 67.562 282.627 9.12902 6.402 1.652 80.6347 4.6969 5.7812 2020-Dec-21 12:00 2459205.000000000 Am 21 39 51.60 -08 59 11.3 217.7053 29.9121 0.812471269178 0.70206047717127 54.5848 /T 67.562 282.640 9.13802 6.408 1.654 80.6443 4.7285 5.7707 2020-Dec-21 12:30 2459205.020833333 m 21 39 58.51 -08 59 06.8 225.0450 26.3186 0.812507359947 0.70185444950477 54.5904 /T 67.562 282.654 9.14704 6.414 1.656 80.6539 4.7602 5.7601 2020-Dec-21 13:00 2459205.041666667 m 21 40 05.42 -08 59 02.4 231.8321 22.2512 0.812543591953 0.70164889017568 54.5961 /T 67.562 282.667 9.15606 6.420 1.659 80.6635 4.7918 5.7496 2020-Dec-21 13:30 2459205.062500000 m 21 40 12.35 -08 58 57.9 238.1287 17.7999 0.812579965167 0.70144375211414 54.6017 /T 67.562 282.680 9.16509 6.426 1.661 80.6730 4.8235 5.7391 >..... 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 dates prior to 1582-Oct-15 are in the Julian calendar system. Later calendar dates are in the Gregorian system. 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 symbol: '*' 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 MARKER (OBSERVING SITE) The solar-presence symbol is immediately followed by another marker symbol: 'm' Refracted upper-limb of Moon on or above apparent horizon ' ' Refracted upper-limb of Moon below apparent horizon OR geocentric 'r' Rise (target body on or above cut-off RTS elevation) 't' Transit (target body at or past local maximum RTS elevation) 's' Set (target body on or 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. STATISTICAL UNCERTAINTIES Output includes formal +/- 3 standard-deviation statistical orbit uncertainty quantities. There is a 99.7% chance the actual value is within given bounds. These statistical calculations assume observational data errors are random. If there are systematic biases (such as timing, reduction or star-catalog errors), results can be optimistic. Because the epoch covariance is mapped using linearized variational partial derivatives, results can also be optimistic for times far from the solution epoch, particularly for objects having close planetary encounters. '' = 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} '' = 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 '' = The Sun's apparent range ("r", light-time aberrated) relative to the target center, as seen by the observer. Units: AU '' = Apparent range ("delta", light-time aberrated) of the target center relative to the observer. Units: AU '' = 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 '' = The position angles of the extended Sun-to-target radius vector ("PsAng") and the negative of the targets' heliocentric velocity vector ("PsAMV"), as seen in the observers' plane-of-sky, measured counter-clockwise (east) from reference-frame north-pole. Primarily intended for ACTIVE COMETS, "PsAng" is an indicator of the comets' gas-tail orientation in the sky (being in the anti-sunward direction) while "PsAMV" is an indicator of dust-tail orientation. Units: DEGREES '' = Angle between observer and target orbital plane, measured from center of target at the moment light seen at observation time leaves the target. Positive values indicate observer is above the objects' orbital plane, in the direction of reference-frame +z axis. Units: DEGREES '' = Uncertainty in Right-Ascension and Declination. Output values are the formal +/- 3 standard-deviations (sigmas) around nominal position. Units: ARCSECONDS '' = "phi" is the true PHASE ANGLE at the observers' location at print time. "PAB-LON" and "PAB-LAT" are the J2000 ecliptic longitude and latitude of the phase angle bisector direction; the outward directed angle bisecting the arc created by the apparent vector from Sun to target center and the astrometric vector from observer to target center. For an otherwise uniform ellipsoid, the time when its long-axis is perpendicular to the PAB direction approximately corresponds to lightcurve maximum (or maximum brightness) of the body. PAB is discussed in Harris et al., Icarus 57, 251-258 (1984). Units: DEGREES, DEGREES, DEGREES Computations by ... Solar System Dynamics Group, Horizons On-Line Ephemeris System 4800 Oak Grove Drive, Jet Propulsion Laboratory Pasadena, CA 91109 USA Information : https://ssd.jpl.nasa.gov/ Documentation: https://ssd.jpl.nasa.gov/?horizons_doc Connect : https://ssd.jpl.nasa.gov/?horizons (browser) telnet ssd.jpl.nasa.gov 6775 (command-line) e-mail command interface available Script and CGI interfaces available Author : Jon.D.Giorgini@jpl.nasa.gov *********************************************************************************************************************************************************************************************************