Solar System
Dynamics &
Planetology
Group 		C/1989 X1 Austin


SSDP Cometary Note C1989X1N1-001

Comet C/1989 X1 Austin

number of observations 281
number of residuals 537
data interval 1989 Dec. 6 — 1990 June 27
rms [arcsec] 1.28
orbit quality class 1b

Osculating orbital elements (heliocentric; ecliptic J2000.0)

Epoch (TT) 19900419.0 = JD 2448000.5
time of perihelion passage (TT) 19900409.967504 ± 0.000033
perihelion distance 0.34977205 ± 0.00000053
eccentricity 1.00021591 ± 0.00000309
argument of perihelion [deg] 61.575931 ± 0.000097
longitude of the ascending node [deg] 75.925341 ± 0.000017
inclination [deg] 58.956430 ± 0.000065
inverse semimajor axis [10-6 au-1] -617.28 ± 8.83

Nongravitational parameters [10-8 au/day2] A1 = 0.2675 ± 0.0729 A2 = 0.0327 ± 0.0221 A3 = 0.0 (assumed)

Note: Epoch is given in a format: yyyymmdd.d, time of perihelion passage in a format of yyyymmdd.dddddd.

Original orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 16921106
time of perihelion passage (TT) 19900409.258092 ± 0.000128
perihelion distance 0.34831385 ± 0.00000156
eccentricity 0.99998577 ± 0.00000345
argument of perihelion [deg] 61.656955 ± 0.000303
longitude of the ascending node [deg] 75.909182 ± 0.000017
inclination [deg] 58.983562 ± 0.000065
inverse semimajor axis [10-6 au-1] 40.84 ± 9.89

Note: Values of uncertainties of original/future orbital elements were derived using a swarm of 5001 osculating orbits of VCs (including the nominal osculating orbit given above) for original/future orbital evolution calclulations and then by fitting the distribution of a given orbital element of original/future swarm of VCs to Gaussian distribution.

Original barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. before entering the planetary zone.

Future orbital elements (barycentric; at 250 au from the Sun)

Epoch (TT) 22830403
time of perihelion passage (TT) 19900410.752338 ± 0.000035
perihelion distance 0.34950188 ± 0.00000087
eccentricity 1.00012895 ± 0.00000189
argument of perihelion [deg] 61.606028 ± 0.000126
longitude of the ascending node [deg] 75.873023 ± 0.000017
inclination [deg] 58.880721 ± 0.000065
inverse semimajor axis [10-6 au-1] -368.96 ± 5.42


Future barycentric positions and velocities of 5001 VCs at 250 au from the Sun are given here   (data format), i.e. after leaving the planetary zone.





Solar System Dynamics & Planetology Group, 2013. All rights reserved

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