C/1996 E1 NEAT
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Comet C/1996 E1 was discovered on 15 March 1996 by Near-Earth-Asteroid Tracking Team (Jet Propulsion Laboratory), that is about 4.5 months before its perihelion passage.This comet was last observed in the mid-October 1996.
Comet had its closest approach to the Earth on 25 September 1996 (1.168 au), about 2 months after its perihelion passage.
This is a comet with nongravitational effects strongly manifested in positional data fitting.
Solutions given here are based on data spanning over 0.578 yr in a range of heliocentric distances: 2.31 au – 1.36 au (perihelion) – 1.76 au.
This Oort spike comet suffers rather moderate planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit.
See also Królikowska 2014 and Królikowska 2020.
Comet had its closest approach to the Earth on 25 September 1996 (1.168 au), about 2 months after its perihelion passage.
This is a comet with nongravitational effects strongly manifested in positional data fitting.
Solutions given here are based on data spanning over 0.578 yr in a range of heliocentric distances: 2.31 au – 1.36 au (perihelion) – 1.76 au.
This Oort spike comet suffers rather moderate planetary perturbations during its passage through the planetary system; these perturbations lead to a more tight future orbit.
See also Królikowska 2014 and Królikowska 2020.
| solution description | ||
|---|---|---|
| number of observations | 249 | |
| data interval | 1996 03 15 – 1996 10 12 | |
| data type | significantly more measurements before perihelion (PRE+) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.31 au – 1.36 au (perihelion) – 1.76 au | |
| type of model of motion | NS - non-gravitational orbits for standard g(r) | |
| data weighting | YES | |
| number of residuals | 492 | |
| RMS [arcseconds] | 0.60 | |
| orbit quality class | 1b | |
| orbital elements (heliocentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 1996 02 07 | |
| perihelion date | 1996 07 27.35305291 | ± 0.00038457 |
| perihelion distance [au] | 1.35878155 | ± 0.00001264 |
| eccentricity | 1.00079315 | ± 0.00001209 |
| argument of perihelion [°] | 81.117775 | ± 0.000510 |
| ascending node [°] | 149.841668 | ± 0.000048 |
| inclination [°] | 114.473203 | ± 0.000231 |
| reciprocal semi-major axis [10-6 au-1] | -583.72 | ± 8.90 |
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.
| non-gravitational parameters | ||
|---|---|---|
| A1 [10-8au/day2] | 6.9403 | ± 0.7435 |
| A2 [10-8au/day2] | 0.55214 | ± 0.37555 |
| A3 [10-8au/day2] | 0.08711 | ± 0.23275 |
| m | -2.15 | |
| n | 5.093 | |
| k | -4.6142 | |
| r0 [au] | 2.808 | |
| α | 0.1113 | |