C/1975 E1 Bradfield
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Comet C/1975 E1 was discovered on 12 March 1975 by William A. Bradfield (Dernancourt, South Australia, Australia), that is about 3 weeks before its perihelion passage.This comet was observed until 5 April 1976. [Kronk, Cometography: Volume 6].
Comet had its closest approach to the Earth on 19 April 1975 (1.838 au), about 2 weeks after its perihelion passage.
Solution given here is based on data spanning over 0.977 yr in a range of heliocentric distances: 1.26 au – 1.217 au (perihelion) – 4.44 au.
This Oort spike comet suffers large planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the solar system on hyperbolic orbit.
See also Królikowska 2020.
Comet had its closest approach to the Earth on 19 April 1975 (1.838 au), about 2 weeks after its perihelion passage.
Solution given here is based on data spanning over 0.977 yr in a range of heliocentric distances: 1.26 au – 1.217 au (perihelion) – 4.44 au.
This Oort spike comet suffers large planetary perturbations during its passage through the planetary system; these perturbations lead to escape the comet from the solar system on hyperbolic orbit.
See also Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 54 | |
| data interval | 1975 03 15 – 1976 03 07 | |
| data type | significantly more measurements after perihelion (POST+) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 1.26 au – 1.22 au (perihelion) – 4.44 au | |
| detectability of NG effects in the comet's motion | NG effects not determinable | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | NO | |
| number of residuals | 108 | |
| RMS [arcseconds] | 1.54 | |
| orbit quality class | 2a | |
| previous orbit statistics, both Galactic and stellar perturbations were taken into account | ||
|---|---|---|
| no. of returning VCs in the swarm | 3069 | * |
| no. of escaping VCs in the swarm | 1932 | |
| no. of hyperbolas among escaping VCs in the swarm | 716 | |
| previous reciprocal semi-major axis [10-6 au-1] | -5.32 – 26.67 – 58.81 | |
| previous perihelion distance [au] | 0.35 – 160 – 270 | R |
| previous aphelion distance [103 au] | 33 – 65 – 230 | |
| time interval to previous perihelion [Myr] | 1.9 – 3.6 – 10 | R |
| percentage of VCs with qprev < 10 | 24 | |
| percentage of VCs with 10 < qprev < 20 | 1 | |
| percentage of VCs with qprev > 20 | 75 | |
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 | 3353 | * |
| no. of escaping VCs in the swarm | 1648 | |
| no. of hyperbolas among escaping VCs in the swarm | 717 | |
| previous reciprocal semi-major axis [10-6 au-1] | -5.36 – 26.65 – 58.81 | |
| previous perihelion distance [au] | 0.12 – 2 – 360 | R |
| previous aphelion distance [103 au] | 33 – 65 – 230 | |
| time interval to previous perihelion [Myr] | 1.9 – 4.3 – 10 | R |
| percentage of VCs with qprev < 10 | 61 | |
| percentage of VCs with 10 < qprev < 20 | 5 | |
| percentage of VCs with qprev > 20 | 34 | |