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 |