Dastcom5 parameters

avail:

  • a if it is available for asteroids.
  • c if it is available for comets.
  • [number]+ since which version of DASTCOM5 is available.
avail Label Definition
ac/3+ EPOCH Time of osc. orbital elements solution, JD (CT,TDB)
ac/3+ CALEPO Time of osc. orbital elements solution, YYYYDDMM.ffff
ac/3+ MA Mean anomaly at EPOCH, deg (elliptical & hyperbolic cases “9.999999E99” if not available)
ac/3+ W Argument of periapsis at EPOCH, J2000 ecliptic, deg.
ac/3+ OM Longitude of ascending node at EPOCH, J2000 ecliptic,deg.
ac/3+ IN Inclination angle at EPOCH wrt J2000 ecliptic, deg.
ac/3+ EC Eccentricity at EPOCH
ac/3+ A Semi-major axis at EPOCH, au
ac/3+ QR Perihelion distance at EPOCH, au
ac/3+ TP Perihelion date for QR at EPOCH, JD (CT,TDB)
ac/3+ TPCAL Perihelion date for QR at EPOCH, format YYYYMMDD.fff
ac/5+ TPFRAC Decimal (fractional) part of TP for extended precision
ac/4+ SOLDAT Date orbit solution was performed, JD (CT,TDB)
ac/4+ SRC(01) Square root covariance vector. Vector-stored upper- triangular matrix with order {EC,QR,TP,OM,W,IN,{ ESTL }}
ac/3+ H Absolute visual magnitude (IAU H-G system) (99=unknown)
ac/3+ G Mag. slope parm. (IAU H-G)(99=unknown & 0.15 not assumed)
c/3+ M1 Total absolute magnitude, mag.
c/3+ M2 Nuclear absolute magnitue, mag.
c/4+ K1 Total absolute magnitude scaling factor
c/4+ K2 Nuclear absolute magnitude scaling factor
c/4+ PHCOF Phase coefficient for K2= 5
ac/3+ A1 Non-grav. accel., radial component, [s:10^-8 au/day^2]
ac/3+ A2 Non-grav. accel., transverse component,[s:10^-8 au/day^2
ac/4+ A3 Non-grav. accel., normal component, [s:10^-8 au/day^2]
c/4+ DT Non-grav. lag/delay parameter, days
ac/5+ R0 Non-grav. model constant, normalizing distance, au
ac/5+ ALN Non-grav. model constant, normalizing factor
ac/5+ NM Non-grav. model constant, exponent m
ac/5+ NN Non-grav. model constant, exponent n
ac/5+ NK Non-grav. model constant, exponent k
c/4+ S0 Center-of-light estimated offset at 1 au, km
c/5+ TCL Center-of-light start-time offset, d since “ref.time”
a /5+ LGK Surface thermal conductivity log_10(k), (W/m/K)
ac/5+ RHO Bulk density, kg/m^3
ac/5+ AMRAT Solar pressure model, area/mass ratio, m^2/kg
c/5+ AJ1 Jet 1 acceleration, au/d^2
c/5+ AJ2 Jet 2 acceleration, au/d^2
c/5+ ET1 Thrust angle, colatitude of jet 1, deg.
c/5+ ET2 Thrust angle, colatitude of jet 2, deg.
c/5+ DTH Jet model diurnal lag angle, deg. (delta_theta)
ac/5+ ALF Spin pole orientation, RA, deg.
ac/5+ DEL Spin pole orientation, DEC, deg.
ac/5+ SPHLM3 Earth gravity sph. harm. model limit, Earth radii
ac/5+ SPHLM5 Jupiter grav. sph. harm. model limit, Jupiter radii
ac/3+ RP Object rotational period, hrs
ac/3+ GM Object mass parameter, km^3/s^2
ac/3+ RAD Object mean radius, km
ac/5+ EXTNT1 Triaxial ellipsoid, axis 1/largest equat. extent, km
ac/5+ EXTNT2 Triaxial ellipsoid, axis 2/smallest equat. extent, km
ac/5+ EXTNT3 Triaxial ellipsoid, axis 3/polar extent, km
ac/4+ MOID Earth MOID at EPOCH time, au; ‘99’ if not computed
ac/3+ ALBEDO Geometric visual albedo, 99 if unknown
a /3+ BVCI B-V color index, mag., 99 if unknown
a /5+ UBCI U-B color index, mag., 99 if unknown
a /5+ IRCI I-R color index, mag., 99 if unknown
ac/4+ RMSW RMS of weighted optical residuals, arcsec
ac/5+ RMSU RMS of unweighted optical residuals, arcsec
ac/5+ RMSN RMS of normalized optical residuals
ac/5+ RMSNT RMS of all normalized residuals
a /5+ RMSH RMS of abs. visual magnitude (H) residuals, mag.
c/5+ RMSMT RMS of MT estimate residuals, mag.
c/5+ RMSMN RMS of MN estimate residuals, mag.
ac/3+ NO Logical record-number of this object in DASTCOM
ac/4+ NOBS Number of observations of all types used in orbit soln.
ac/4+ OBSFRST Start-date of observations used in fit, YYYYMMDD
ac/4+ OBSLAST Stop-date of observations used in fit, YYYYMMDD
ac/5+ PRELTV Planet relativity “bit-switch” byte: bits 0-7 are set to 1 if relativity for corresponding planet was computed, 0 if not. For example, if Earth & Jupiter, FORTRAN(95) statement IBITS(PRELTV,J,1) should return 1 when J=2 or J=4, but zero for every other J through 7. No provision for supporting Pluto relativity.
ac/5+ SPHMX3 Earth grav. model max. degree; 0=point-mass, 2= J2 only, 3= up to J3 zonal, 22= 2x2 field, 33=3x3 field, etc.
ac/5+ SPHMX5 Jupiter grav. max. deg.; 0=point-mass, 2= J2 only, 3= up to J3 zonal, 22= 2x2 field, 33=3x3 field, etc.
ac/5+ JGSEP Galilean satellites used as sep. perturbers; 0=no 1=yes
ac/5+ TWOBOD Two-body orbit model flag; 0=no 1=yes
ac/5+ NSATS Number of satellites; 99 if unknown.
ac/4+ UPARM Orbit condition code; 99 if not computed
ac/4+ LSRC Length of square-root cov. vector SRC (# elements used)
c/3+ IPYR Perihelion year (i.e., 1976, 2012, 2018, etc.)
ac/3+ NDEL Number of radar delay measurements used in orbit soln.
ac/3+ NDOP Number of radar Doppler measurements used in orbit soln.
c/5+ NOBSMT Number of magnitude measurements used in total mag. soln.
c/5+ NOBSMN Number of magnitude measurements used in nuc. mag. soln.
c/3+ COMNUM IAU comet number (parsed from DESIG)
ac/3+ EQUNOX Equinox of orbital elements (‘1950’ or ‘2000’)
ac/4+ PENAM Planetary ephemeris ID/name
ac/3+ SBNAM Small-body perturber ephemeris ID/name
a /3 SPTYPT Tholen spectral type
a /4+ SPTYPS SMASS-II spectral type
ac/3+ DARC Data arc span (year-year, OR integer # of days)
a /3+ COMNT1 Asteroid comment line #1
a /3+ COMNT2 Asteroid comment line #2
c/3+ COMNT3 Comet comment line #1
c/3+ COMNT4 Comet comment line #2
ac/3+ DESIG Object designation
ac/4+ ESTL Dynamic parameter estimation list. Last symbol set to ‘+’ if list is too long for field; check object record comments field for full list.
ac/3+ IREF Solution reference/ID/name
ac/3+ NAME Object name