******************************************************************************* JPL/HORIZONS 1627 Ivar (1929 SH) 2024-May-04 18:38:01 Rec #: 1627 (+COV) Soln.date: 2024-Mar-14_06:24:19 # obs: 13333 (1929-2024) IAU76/J2000 helio. ecliptic osc. elements (au, days, deg., period=Julian yrs): EPOCH= 2457137.5 ! 2015-Apr-25.00 (TDB) Residual RMS= .27249 EC= .3964576537153551 QR= 1.124608024483787 TP= 2457409.7956322124 OM= 133.1496865439827 W= 167.7534285879283 IN= 8.451276790790796 A= 1.863345681387193 MA= 254.4873326263866 ADIST= 2.602083338290599 PER= 2.5436 N= .387493059 ANGMOM= .021557377 DAN= 2.56376 DDN= 1.13192 L= 301.0321476 B= 1.786474 MOID= .112348 TP= 2016-Jan-22.2956322124 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= 4.56 ROTPER= 4.795 H= 12.84 G= .600 B-V= .872 ALBEDO= .150 STYP= S Asteroid non-gravitational force model (AMRAT= m^2/kg;A1,A2,A3=au/d^2;R0=au): AMRAT= 0. A1= 0. A2= 1.69928355831E-15 A3= 0. Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 5.093 R0= 1. ASTEROID comments: 1: soln ref.= JPL#1335, OCC=0 radar( 3 delay, 1 Dop.) 2: source=ORB; Nongravitational accels. using nonstandard g(r) = (1 au/ r)^2 ******************************************************************************* ******************************************************************************* Ephemeris / WWW_USER Sat May 4 18:38:01 2024 Pasadena, USA / Horizons ******************************************************************************* Target body name: 1627 Ivar (1929 SH) {source: JPL#1335} Center body name: Earth (399) {source: DE441} Center-site name: GEOCENTRIC ******************************************************************************* Start time : A.D. 2023-Apr-29 06:00:00.0000 UT Stop time : A.D. 2023-Apr-30 00:00:00.0000 UT Step-size : 60 minutes ******************************************************************************* Target pole/equ : undefined Target radii : 4.56 km Center geodetic : 0.0, 0.0, -6378.137 {E-lon(deg),Lat(deg),Alt(km)} Center cylindric: 0.0, 0.0, 0.0 {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 : Sun Vis. interferer : MOON (R_eq= 1737.400) km {source: DE441} Rel. light bend : Sun {source: DE441} Rel. lght bnd GM: 1.3271E+11 km^3/s^2 Small-body perts: Yes {source: SB441-N16} Atmos refraction: NO (AIRLESS) RA format : HMS Time format : CAL Calendar mode : Mixed Julian/Gregorian EOP file : eop.240503.p240727 EOP coverage : DATA-BASED 1962-JAN-20 TO 2024-MAY-03. PREDICTS-> 2024-JUL-26 Units conversion: 1 au= 149597870.700 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 ) Table cut-offs 3: RA/DEC angular rate ( 0.0=NO ) ******************************************************************************* Initial IAU76/J2000 heliocentric ecliptic osculating elements (au, days, deg.): EPOCH= 2457137.5 ! 2015-Apr-25.00 (TDB) Residual RMS= .27249 EC= .3964576537153551 QR= 1.124608024483787 TP= 2457409.7956322124 OM= 133.1496865439827 W= 167.7534285879283 IN= 8.451276790790796 Equivalent ICRF heliocentric cartesian coordinates (au, au/d): X=-2.123318105700668E+00 Y= 6.900173424787079E-01 Z= 4.596619365712502E-01 VX=-1.435876381460531E-04 VY=-9.573015331587918E-03 VZ=-3.027302525551920E-03 Asteroid physical parameters (km, seconds, rotational period in hours): GM= n.a. RAD= 4.56 ROTPER= 4.795 H= 12.84 G= .600 B-V= .872 ALBEDO= .150 STYP= S Asteroid non-gravitational force model (AMRAT= m^2/kg;A1,A2,A3=au/d^2;R0=au): AMRAT= 0. A1= 0. A2= 1.69928355831E-15 A3= 0. Non-standard or simulated/proxy model: ALN= 1. NK= 0. NM= 2. NN= 5.093 R0= 1. ******************************************************************************************************************************************* Date__(UT)__HR:MN APmag S-brt r rdot delta deldot S-O-T /r Cnst RNG_3sigma RNGRT_3sig ******************************************************************************************************************************************* $$SOE 2023-Apr-29 06:00 13.880 4.713 1.650720347362 -9.3510871 0.74420247304133 -0.0532039 140.5621 /T Com 2.2941 0.0000003 2023-Apr-29 07:00 13.880 4.714 1.650495313396 -9.3514663 0.74420131718407 -0.0428568 140.5157 /T Com 2.2955 0.0000003 2023-Apr-29 08:00 13.881 4.714 1.650270270323 -9.3518447 0.74420041014109 -0.0325261 140.4692 /T Com 2.2969 0.0000003 2023-Apr-29 09:00 13.881 4.714 1.650045218163 -9.3522221 0.74419975151951 -0.0222117 140.4227 /T Com 2.2982 0.0000003 2023-Apr-29 10:00 13.881 4.714 1.649820156940 -9.3525986 0.74419934092640 -0.0119136 140.3763 /T Com 2.2996 0.0000003 2023-Apr-29 11:00 13.881 4.714 1.649595086675 -9.3529742 0.74419917796880 -0.0016318 140.3298 /T Com 2.3010 0.0000003 2023-Apr-29 12:00 13.882 4.714 1.649370007390 -9.3533489 0.74419926225376 0.0086336 140.2833 /T Com 2.3023 0.0000003 2023-Apr-29 13:00 13.882 4.715 1.649144919108 -9.3537227 0.74419959338831 0.0188827 140.2369 /T Com 2.3037 0.0000003 2023-Apr-29 14:00 13.882 4.715 1.648919821850 -9.3540955 0.74420017097944 0.0291155 140.1905 /T Com 2.3051 0.0000003 2023-Apr-29 15:00 13.882 4.715 1.648694715638 -9.3544674 0.74420099463417 0.0393319 140.1440 /T Com 2.3064 0.0000003 2023-Apr-29 16:00 13.883 4.715 1.648469600495 -9.3548384 0.74420206395950 0.0495321 140.0976 /T Com 2.3078 0.0000003 2023-Apr-29 17:00 13.883 4.715 1.648244476443 -9.3552085 0.74420337856241 0.0597158 140.0512 /T Com 2.3092 0.0000003 2023-Apr-29 18:00 13.883 4.715 1.648019343504 -9.3555777 0.74420493804989 0.0698833 140.0048 /T Com 2.3105 0.0000003 2023-Apr-29 19:00 13.883 4.715 1.647794201699 -9.3559459 0.74420674202892 0.0800344 139.9584 /T Com 2.3119 0.0000003 2023-Apr-29 20:00 13.884 4.716 1.647569051053 -9.3563132 0.74420879010652 0.0901692 139.9120 /T Com 2.3133 0.0000003 2023-Apr-29 21:00 13.884 4.716 1.647343891585 -9.3566796 0.74421108188965 0.1002877 139.8656 /T Com 2.3146 0.0000003 2023-Apr-29 22:00 13.884 4.716 1.647118723320 -9.3570451 0.74421361698534 0.1103898 139.8192 /T Com 2.3160 0.0000003 2023-Apr-29 23:00 13.884 4.716 1.646893546278 -9.3574096 0.74421639500061 0.1204756 139.7728 /T Com 2.3173 0.0000003 2023-Apr-30 00:00 13.885 4.716 1.646668360483 -9.3577732 0.74421941554245 0.1305450 139.7264 /T Com 2.3187 0.0000003 $$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. STATISTICAL UNCERTAINTIES Output includes formal +/- 3 standard-deviation statistical orbit uncertainty quantities. There is a 99.7% (1-D) or 98.9% (2-D) 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. 'APmag S-brt' = The asteroids' approximate apparent airless visual magnitude and surface brightness using the standard IAU H-G system magnitude model: APmag = H + 5*log10(delta) + 5*log10(r) - 2.5*log10((1-G)*phi_1 + G*phi_2) For solar phase angles >90 deg, the error could exceed 1 magnitude. For phase angles >120 degrees, output values are rounded to the nearest integer to indicate error could be large and unknown. 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 'Cnst' = Constellation ID; the 3-letter abbreviation for the name of the constellation containing the target centers' astrometric position, as defined by IAU (1930) boundary delineation. See documentation for list of abbreviations. 'RNG_3sigma RNGRT_3sig' = Range and range rate (radial velocity) formal 3-standard-deviation uncertainties. Units: KM, KM/S 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/hrzn_batch.txt scripts https://ssd.jpl.nasa.gov/ftp/ssd/SCRIPTS Author : Jon.D.Giorgini@jpl.nasa.gov ******************************************************************************************************************************************* !$$SOF COMMAND = 'Ivar' START_TIME = '2023-04-29 06:00' STOP_TIME = '2023-04-30' STEP_SIZE = '1 hour' QUANTITIES = '9,19,20,23,29,39'