C/1987 H1 Shoemaker
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Comet C/1987 H1 was discovered by Carolyn S. and Eugene M. Shoemaker (with the 0.46-m Schmidt telescope at Palomar) on 25 April 1987 (IAUC 4384), when the comet was more than five months after its perihelion passage. The comet was last seen on 4 January 1992.
Comet had its closest approach to the Earth on 22 June 1986 (4.551 au), almost 5 months before its perihelion passage. After perihelion passage, it has second close approach to the Earth on 16 May 1987 (4.74 au), that was three weeks after its discovery.
Solution given here is based on data spanning over 4.7 yr in a range of heliocentric distances from 5.58 au to 13.40 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system but these perturbations probably lead to escape of the comet from the solar system (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.
Comet had its closest approach to the Earth on 22 June 1986 (4.551 au), almost 5 months before its perihelion passage. After perihelion passage, it has second close approach to the Earth on 16 May 1987 (4.74 au), that was three weeks after its discovery.
Solution given here is based on data spanning over 4.7 yr in a range of heliocentric distances from 5.58 au to 13.40 au.
This Oort spike comet suffers slight planetary perturbations during its passage through the planetary system but these perturbations probably lead to escape of the comet from the solar system (see future barycentric orbit).
See also Królikowska 2014 and Królikowska and Dybczyński 2017.
| solution description | ||
|---|---|---|
| number of observations | 127 | |
| data interval | 1987 04 25 – 1992 01 04 | |
| data type | observed only after perihelion (POST) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 5.58 au – 13.4au | |
| 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 | 242 | |
| RMS [arcseconds] | 0.91 | |
| orbit quality class | 1a+ | |
| 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] | 39.14 – 41.49 – 42.91 | |
| previous perihelion distance [au] | 300 – 500 – 730 | |
| previous aphelion distance [103 au] | 46.3 – 47.7 – 50.4 | |
| time interval to previous perihelion [Myr] | 2.9 – 3.2 – 3.6 | |
| percentage of VCs with qprev > 20 | 100 | |
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] | 41.83 – 45.47 – 49.05 | |
| previous perihelion distance [au] | 8.9 – 10 – 12 | |
| previous aphelion distance [103 au] | 40.8 – 44 – 47.8 | |
| time interval to previous perihelion [Myr] | 2.9 – 3.3 – 3.7 | |
| percentage of VCs with qprev < 10 | 44 | |
| percentage of VCs with 10 < qprev < 20 | 56 | |