*******************************************************************************
Ephemeris / WWW_USER Fri Apr 5 07:39:58 2013 Pasadena, USA / Horizons
*******************************************************************************
Target body name: ISON (C/2012 S1) {source: JPL#20}
Center body name: Earth (399) {source: DE405}
Center-site name: RIT Observatory, Rochester
*******************************************************************************
Start time : A.D. 2013-Oct-01 00:00:00.0000 UT
Stop time : A.D. 2014-Mar-01 00:00:00.0000 UT
Step-size : 7200 minutes
*******************************************************************************
Target pole/equ : No model available
Target radii : (unavailable)
Center geodetic : 282.335300,43.0758047,0.1516469 {E-lon(deg),Lat(deg),Alt(km)}
Center cylindric: 282.335300,4666.31662,4333.7606 {E-lon(deg),Dxy(km),Dz(km)}
Center pole/equ : High-precision EOP model {East-longitude +}
Center radii : 6378.1 x 6378.1 x 6356.8 km {Equator, meridian, pole}
Target primary : Sun {source: DE405}
Vis. interferer : MOON (R_eq= 1737.400) km {source: DE405}
Rel. light bend : Sun, EARTH {source: DE405}
Rel. lght bnd GM: 1.3271E+11, 3.9860E+05 km^3/s^2
Small perturbers: Ceres, Pallas, Vesta {source: SB405-CPV-2}
Small body GMs : 6.32E+01, 1.43E+01, 1.78E+01 km^3/s^2
Atmos refraction: NO (AIRLESS)
RA format : HMS
Time format : CAL
EOP file : eop.130404.p130626
EOP coverage : DATA-BASED 1962-JAN-20 TO 2013-APR-04. PREDICTS-> 2013-JUN-25
Units conversion: 1 AU= 149597870.691 km, c= 299792.458 km/s, 1 day= 86400.0 s
Table cut-offs 1: Elevation (-90.0deg=NO ),Airmass (>38.000=NO), Daylight (NO )
Table cut-offs 2: Solar Elongation ( 0.0,180.0=NO ),Local Hour Angle( 0.0=NO )
*******************************************************************************
Initial FK5/J2000.0 heliocentric ecliptic osculating elements (AU, DAYS, DEG):
EPOCH= 2456300.5 != 2013-Jan-08.0000000 (CT) Residual RMS= .51185
EC= 1.000004178571949 QR= .01250228833615271 TP= 2456625.2792846924
OM= 295.7371915514632 W= 345.5093083227027 IN= 61.86120174134099
Comet physical & dynamic parameters (KM, SEC; A1,A2,A3=AU/d^2; DT=days):
GM= n.a. RAD= n.a. A1= n.a.
A2= n.a. A3= n.a. DT= n.a.
M1= 8.2 M2= 9.9 k1= 7.
k2= 5. PHCOF= .030
********************************************************************************************************************************************************************************************************************
Date__(UT)__HR:MN R.A._(ICRF/J2000.0)_DEC dRA*cosD d(DEC)/dt a-mass T-mag N-mag Sl-lon Sl-lat SN.ang SN.dist hEcl-Lon hEcl-Lat delta deldot S-O-T /r S-T-O phi PAB-LON PAB-LAT
********************************************************************************************************************************************************************************************************************
$$SOE
2013-Oct-01 00:00 A 09 34 35.05 +17 37 23.3 76.57434 -30.9649 n.a. 11.39 13.45 n.a. n.a. 111.54 0.00 113.5770 3.9638 2.15060690307529 -50.6689873 47.6283 /L 26.6178 26.6216 126.9117 3.5993
2013-Oct-06 00:00 A 09 45 41.39 +16 31 27.1 84.28431 -35.5071 n.a. 11.05 13.25 n.a. n.a. 111.86 0.00 113.7179 3.6957 2.00261012159674 -51.4537924 49.6684 /L 29.3453 29.3489 128.4172 3.3930
2013-Oct-11 00:00 Am 09 57 55.74 +15 15 10.4 94.15978 -41.3681 n.a. 10.68 13.03 n.a. n.a. 112.23 0.00 113.8775 3.3918 1.85273781235214 -51.9728545 51.3916 /L 32.3880 32.3915 130.0979 3.1538
2013-Oct-16 00:00 Am 10 11 38.25 +13 45 23.8 107.1141 -49.1023 n.a. 10.28 12.79 n.a. n.a. 112.64 0.00 114.0607 3.0427 1.70187324679182 -52.1400514 52.6960 /L 35.8415 35.8450 132.0061 2.8710
2013-Oct-21 00:00 m 10 27 17.64 +11 57 37.1 124.4685 -59.5090 n.a. 9.83 12.53 n.a. n.a. 113.07 0.00 114.2742 2.6354 1.55119188377114 -51.8300198 53.4389 /L 39.8424 39.8458 134.2170 2.5291
2013-Oct-26 00:00 10 45 34.94 +09 45 24.3 148.1450 -73.7360 n.a. 9.33 12.25 n.a. n.a. 113.48 0.00 114.5283 2.1504 1.40235960670297 -50.8147877 53.4168 /L 44.5856 44.5890 136.8380 2.1043
2013-Oct-31 00:00 11 07 29.58 +06 59 36.0 180.9860 -93.3511 n.a. 8.76 11.95 n.a. n.a. 113.79 0.00 114.8387 1.5575 1.25793496830800 -48.6874475 52.3349 /L 50.3508 50.3543 140.0249 1.5587
2013-Nov-05 00:00 11 34 28.29 +03 27 37.8 226.9549 -120.075 n.a. 8.12 11.64 n.a. n.a. 113.84 0.00 115.2317 0.8063 1.12204300157677 -44.7394228 49.7706 /L 57.5323 57.5360 144.0022 0.8279
2013-Nov-10 00:00 m 12 08 35.55 -01 05 39.1 290.6135 -154.270 n.a. 7.39 11.32 n.a. n.a. 113.27 0.00 115.7555 -0.1956 1.00152099532211 -37.7600476 45.1531 /L 66.6466 66.6507 149.0805 -0.2060
2013-Nov-15 00:00 m 12 52 37.37 -06 51 11.6 373.9656 -190.084 n.a. 6.54 11.00 n.a. n.a. 111.33 0.00 116.5129 -1.6436 0.90767546162155 -25.8347983 37.8385 /L 78.2216 78.2262 155.6432 -1.7819
2013-Nov-20 00:00 m 13 49 32.50 -13 34 58.0 469.2155 -206.950 n.a. 5.48 10.63 n.a. n.a. 106.51 0.00 117.7815 -4.0627 0.85845883353308 -6.2662383 27.4422 /L 92.3178 92.3229 164.0765 -4.4897
2013-Nov-25 00:00 15 01 33.99 -20 05 42.5 570.0445 -169.614 n.a. n.a. n.a. n.a. n.a. 95.01 0.00 120.8499 -9.8279 0.88208825669532 26.4137768 14.2791 /L 107.0262 107.0317 175.2954 -10.6569
2013-Nov-30 00:00 16 21 17.94 -16 18 58.7 -85.1851 395.2029 n.a. n.a. n.a. n.a. n.a. 173.56 0.00 84.2383 44.9111 0.91204416336777 -86.4098782 5.3182 /L 127.4462 127.4478 212.1813 63.9166
2013-Dec-05 00:00 16 13 32.81 -06 18 02.7 -34.8421 275.7466 n.a. n.a. n.a. n.a. n.a. 155.06 0.00 97.1448 31.2635 0.74013843506752 -46.0520009 17.7883 /L 123.3639 123.3669 181.1259 54.4440
2013-Dec-10 00:00 m 16 10 36.80 +03 17 51.9 -9.47292 308.2756 n.a. 5.30 11.00 n.a. n.a. 152.75 0.00 99.5635 27.9261 0.62321476090567 -35.3403859 29.6185 /L 115.5715 115.5744 172.4212 55.0513
2013-Dec-15 00:00 m 16 10 30.18 +14 40 56.1 9.343979 379.0145 n.a. 5.72 10.92 n.a. n.a. 152.64 0.00 100.7717 26.1599 0.53213036902991 -27.1455223 42.5588 /L 106.1537 106.1559 162.3897 57.6638
2013-Dec-20 00:00 16 12 53.46 +28 50 25.9 26.23388 469.2170 n.a. 5.98 10.67 n.a. n.a. 152.89 0.00 101.5381 25.0054 0.46628452363516 -17.5320585 57.4044 /L 94.3926 94.3940 147.8242 59.9551
2013-Dec-25 00:00 16 18 30.27 +45 48 34.4 42.96517 536.5190 6.209 6.25 10.40 n.a. n.a. 152.50 0.00 102.0836 24.1678 0.43224756058887 -5.1888942 73.9913 /L 80.3333 80.3339 129.2417 59.5698
2013-Dec-30 00:00 16 30 48.94 +63 50 38.7 63.75097 525.4687 2.533 6.63 10.24 n.a. n.a. 151.32 0.00 102.4993 23.5207 0.43676294363366 8.6026010 90.3999 /L 65.7173 65.7174 112.6108 55.5185
2014-Jan-04 00:00 m 17 13 20.02 +80 02 05.1 123.8613 428.0702 1.677 7.14 10.28 n.a. n.a. 154.78 0.00 102.8307 22.9993 0.47977418422758 20.8773462 103.7671 /L 53.2271 53.2272 101.9229 49.6039
2014-Jan-09 00:00 m 01 43 53.77 +85 32 17.1 204.5489 -273.688 1.356 7.72 10.52 n.a. n.a. 274.67 0.00 103.1037 22.5662 0.55393366599203 29.9927769 112.5670 /T 44.2766 44.2772 95.9964 43.9149
2014-Jan-14 00:00 m 03 31 42.52 +76 18 49.4 53.10028 -248.655 1.207 8.30 10.86 n.a. n.a. 292.20 0.00 103.3341 22.1982 0.65019543874467 36.2566577 117.1442 /T 38.5359 38.5371 92.7789 39.2357
2014-Jan-19 00:00 03 51 39.62 +69 04 23.2 32.35220 -187.562 1.128 8.85 11.25 n.a. n.a. 288.46 0.00 103.5322 21.8800 0.76157151473807 40.5679905 118.6222 /T 35.0126 35.0142 91.0121 35.5609
2014-Jan-24 00:00 04 02 07.12 +63 35 31.3 26.60142 -142.983 1.081 9.36 11.64 n.a. n.a. 283.50 0.00 103.7052 21.6008 0.88349903180516 43.6453817 118.0691 /T 32.8221 32.8240 90.0523 32.6790
2014-Jan-29 00:00 04 09 51.37 +59 22 34.2 25.09841 -111.163 1.051 9.84 12.02 n.a. n.a. 279.03 0.00 103.8581 21.3529 1.01309105741092 45.9316322 116.2536 /T 31.3723 31.3743 89.5714 30.3860
2014-Feb-03 00:00 Am 04 16 32.96 +56 04 09.6 25.17280 -88.1127 1.031 10.27 12.37 n.a. n.a. 275.33 0.00 103.9947 21.1307 1.14843750945769 47.6705963 113.6715 /T 30.3109 30.3129 89.3945 28.5281
2014-Feb-08 00:00 Am 04 22 47.15 +53 25 39.5 25.82021 -71.0767 1.018 10.67 12.70 n.a. n.a. 272.35 0.00 104.1177 20.9298 1.28816903128219 49.0060254 110.6273 /T 29.4408 29.4426 89.4212 26.9961
2014-Feb-13 00:00 Am 04 28 48.48 +51 16 55.3 26.66170 -58.2498 1.010 11.03 13.01 n.a. n.a. 269.95 0.00 104.2294 20.7470 1.43126891431073 50.0385669 107.3036 /T 28.6551 28.6567 89.5896 25.7129
2014-Feb-18 00:00 A 04 34 43.91 +49 30 47.8 27.56013 -48.4158 1.006 11.37 13.29 n.a. n.a. 268.02 0.00 104.3314 20.5795 1.57695824031592 50.8325830 103.8110 /T 27.8961 27.8974 89.8604 24.6228
2014-Feb-23 00:00 A 04 40 37.24 +48 02 09.2 28.46822 -40.7460 1.005 11.69 13.54 n.a. n.a. 266.46 0.00 104.4251 20.4252 1.72460640526450 51.4265314 100.2174 /T 27.1326 27.1336 90.2077 23.6854
2014-Feb-28 00:00 A 04 46 30.83 +46 47 15.5 29.36552 -34.6601 1.007 11.98 13.78 n.a. n.a. 265.18 0.00 104.5117 20.2824 1.87366048111316 51.8349887 96.5669 /T 26.3478 26.3485 90.6142 22.8709
$$EOE
********************************************************************************************************************************************************************************************************************
Column meaning:
TIME
Prior to 1962, times are UT1. Dates thereafter are UTC. 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.
Time tags refer to the same instant throughout the universe, regardless of
where the observer is located.
The uniform Coordinate Time scale is used internally. It is equivalent to
the current IAU definition of "TDB". Conversion between CT and the selected
non-uniform UT output scale has not been determined for UTC times after the
next July or January 1st. The last known leap-second is used over any future
interval.
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 (OBSERVING SITE)
The solar-presence symbol is immediately followed by a lunar-presence symbol:
'm' Refracted upper-limb of Moon on or above apparent horizon
' ' Refracted upper-limb of Moon below apparent horizon OR geocentric
ephemeris
R.A._(ICRF/J2000.0)_DEC =
J2000.0 astrometric right ascension and declination of target center.
Adjusted for light-time. Units: HMS (HH MM SS.ff) and DMS (DD MM SS.f)
dRA*cosD d(DEC)/dt =
The rate of change of target center apparent RA and DEC (airless).
d(RA)/dt is multiplied by the cosine of the declination.
Units: ARCSECONDS PER HOUR
a-mass =
RELATIVE optical airmass; a measure of extinction. The ratio between
the absolute optical airmass at the target's refracted CENTER-POINT to the
absolute optical airmass at zenith. Based on work of Kasten and Young
(Applied Optics, vol. 28 no. 22, 15-Nov-1989). AVAILABLE ONLY FOR
TOPOCENTRIC SITES WITH THE TARGET ABOVE THE HORIZON. Unitless.
T-mag N-mag =
Comet's approximate apparent visual total magnitude ("T-mag") and nuclear
magnitude ("N-mag") by following definitions:
T-mag = M1 + 5*log10(delta) + k1*log10(r)
N-mag = M2 + 5*log10(delta) + k2*log10(r) + phcof*beta
For comet ISON (C/2012 S1), calculations are turned off near perihelion
since the standard IAU magnitude law may yield spurious brightness estimates
for cases so close to the Sun. Units: magnitudes
Sl-lon Sl-lat =
Apparent planetographic ("geodetic") longitude and latitude of the Sun
(IAU2006) as seen by the observer at print-time. This is NOT exactly the same
as the "sub-solar" (nearest) point for a non-spherical target shape, but is
generally very close if not an irregular body shape. Light travel-time from Sun
to target and from target to observer is taken into account. Latitude is the
angle between the equatorial plane and the line perpendicular to the reference
ellipsoid of the body. The reference ellipsoid is an oblate spheroid with a
single flatness coefficient in which the y-axis body radius is taken to be the
same value as the x-axis radius. Positive longitude is to the WEST.
Units: DEGREES
SN.ang SN.ds =
Target sub-solar point position angle (CCW, or east, with respect to the
direction of the true-of-date Celestial North Pole) and its' angular distance
from the sub-observer point (center of disk) at print time. Negative distance
indicates sub-solar point on hidden hemisphere. Units: DEGREES and ARCSECONDS
hEcl-Lon hEcl-Lat =
Geometric heliocentric J2000 ecliptic longitude and latitude of target
center at the instant light leaves it to be observed at print time (print time
minus 1-way light-time). Units: DEGREES
delta deldot =
Range ("delta") and range-rate ("delta-dot") of target center with respect
to the observer at the instant light seen by the observer at print-time would
have left the target center (print-time minus down-leg light-time); the
distance traveled by a light ray emanating from the center of the target and
recorded by the observer at print-time. "deldot" is a projection of the
velocity vector along this ray, the light-time-corrected line-of-sight from the
coordinate center, and indicates relative motion. A positive "deldot" means the
target center is moving away from the observer (coordinate center). A negative
"deldot" means the target center is moving toward the observer.
Units: AU and KM/S
S-O-T /r =
Sun-Observer-Target angle; target's apparent solar elongation seen from
observer location at print-time. If negative, the target center is behind
the Sun. Angular units: DEGREES.
The '/r' column is a Sun-relative code, output for observing sites
with defined rotation models only.
/T indicates target trails Sun (evening sky)
/L indicates target leads Sun (morning sky)
NOTE: The S-O-T solar elongation angle is the total separation in any
direction. It does not indicate the angle of Sun leading or trailing.
S-T-O phi PAB-LON PAB-LAT =
"S-T-O" is the Sun->Target->Observer angle; the measurable interior vertex
angle at target center formed by a vector to the apparent center of the Sun at
reflection time on the target and a vector to the observer at print-time.
"phi" is the PHASE ANGLE at the observer's location at print time. The
difference with S-T-O is due to down-leg stellar aberration affecting apparent
target position but not apparent solar illumination direction. When computing
phase, Horizons uses "phi", not "S-T-O".
"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, DEGREES
Computations by ...
Solar System Dynamics Group, Horizons On-Line Ephemeris System
4800 Oak Grove Drive, Jet Propulsion Laboratory
Pasadena, CA 91109 USA
Information: http://ssd.jpl.nasa.gov/
Connect : telnet://ssd.jpl.nasa.gov:6775 (via browser)
telnet ssd.jpl.nasa.gov 6775 (via command-line)
Author : Jon.Giorgini@jpl.nasa.gov
********************************************************************************************************************************************************************************************************************
|
