C/1973 A1 Heck-Sause
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Comet C/1973 A1 was discovered on 11 January 1973 by André Heck and Gérard Sause (Haute Provence Observatory, France), that is more than 3 months after its perihelion passage.In the next few months prediscovery images were found taken on 4 January (Sendai Municipal Observatory, Japan) and 10 January (Montpellier, France). This comet was observed until 26 February 1974 [Kronk, Cometography: Volume 5].
Comet had its closest approach to the Earth on 11 February 1973 (1.978 au), a month after its discovery.
Solution given here is based on post-perihelion data spanning over 1.13 yr in a range of heliocentric distances from 2.70 au to 5.53 au.
This Oort spike comet suffers rather small planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit.
See also Królikowska 2020.
Comet had its closest approach to the Earth on 11 February 1973 (1.978 au), a month after its discovery.
Solution given here is based on post-perihelion data spanning over 1.13 yr in a range of heliocentric distances from 2.70 au to 5.53 au.
This Oort spike comet suffers rather small planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit.
See also Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 201 | |
| data interval | 1973 01 04 – 1974 02 19 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.7 au – 5.53au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | YES | |
| number of residuals | 400 | |
| RMS [arcseconds] | 1.24 | |
| orbit quality class | 1b | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 40.41 – 66.09 – 81.83 | |
| previous perihelion distance [au] | 3.1 – 3.9 – 150 | |
| previous aphelion distance [103 au] | 24 – 30 – 49 | |
| time interval to previous perihelion [Myr] | 1.3 – 1.9 – 2.7 | |
| percentage of VCs with qprev < 10 | 84 | |
| percentage of VCs with qprev > 20 | 16 | |
Time distribution of positional observations with corresponding heliocentric (red curve) and geocentric (green curve) distance at which they were taken. The horizontal dotted line shows the perihelion distance for a given comet whereas vertical dotted line — the moment of perihelion passage.
| previous orbit statistics, here only the Galactic tide has been included | ||
|---|---|---|
| no. of returning VCs in the swarm | 5001 | * |
| no. of escaping VCs in the swarm | 0 | |
| no. of hyperbolas among escaping VCs in the swarm | 0 | |
| previous reciprocal semi-major axis [10-6 au-1] | 50.63 – 66.08 – 81.86 | |
| previous perihelion distance [au] | 2.9 – 3.4 – 5 | |
| previous aphelion distance [103 au] | 24 – 30 – 39 | |
| time interval to previous perihelion [Myr] | 1.3 – 1.9 – 2.8 | |
| percentage of VCs with qprev < 10 | 99 | |
| percentage of VCs with 10 < qprev < 20 | 1 | |