C/1955 G1 Abell
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Comet C/1955 G1 was discovered on 13 April 1955, a year and three weeks after perihelion passage, and was last seen on 30 April 1956 [Kronk, Cometography: Volume 4].
The comet made two close approaches to the Earth: on 24 July 1953 (4.09 au, eight months before perihelion passage), and on 21 May 1954 (4.03 au, two months after perihelion).
Solution given here is based on data spanning over 1.1 yr in a range of heliocentric distances from 5.45 au to 7.42 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.
The comet made two close approaches to the Earth: on 24 July 1953 (4.09 au, eight months before perihelion passage), and on 21 May 1954 (4.03 au, two months after perihelion).
Solution given here is based on data spanning over 1.1 yr in a range of heliocentric distances from 5.45 au to 7.42 au.
This Oort spike comet suffers small planetary perturbations during its passage through the planetary system that lead to escape the comet from the planetary zone on a hyperbolic orbit (see future barycentric orbit).
See also Królikowska and Dybczyński 2017.
| solution description | ||
|---|---|---|
| number of observations | 35 | |
| data interval | 1955 04 13 – 1956 04 30 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 5.45 au – 7.42au | |
| 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 | 63 | |
| RMS [arcseconds] | 1.00 | |
| 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] | 59.50 – 81.22 – 102.39 | |
| previous perihelion distance [au] | 4.79 – 5.26 – 6.86 | |
| previous aphelion distance [103 au] | 20 – 25 – 34 | |
| time interval to previous perihelion [Myr] | 0.96 – 1.4 – 2.2 | |
| percentage of VCs with qprev < 10 | 94 | |
| percentage of VCs with qprev > 20 | 6 | |
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] | 59.50 – 81.21 – 102.39 | |
| previous perihelion distance [au] | 4.78 – 5.15 – 6.56 | |
| previous aphelion distance [103 au] | 20 – 25 – 34 | |
| time interval to previous perihelion [Myr] | 0.96 – 1.4 – 2.2 | |
| percentage of VCs with qprev < 10 | 98 | |
| percentage of VCs with 10 < qprev < 20 | 2 | |