C/1958 R1 Burnham-Slaughter
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Comet C/1958 R1 was discovered on 7 September 1958 by Robert Burnham Jr and Charles D. Slaughter during the course of proper motion survey at Lowell Observatory (Flagstaff, Arizona,USA) [Kronk, Cometography: Volume 4], that is 6 months before its perihelion passage. C/1958 R1 was followed until 21 April 1960.
Comet had its closest approach to the Earth on 19 September 1958 (1.92 au, at this moment comet was 2.74 au from the Sun) and 18 March 1959 (1.94 au, six days after its perihelion passage).The MPC cometary database presents GR orbit based of 85 positional observations (data arc: 1958 09 07 – 1960 04 21), however only 40 observations obtained in Flagstaff are available in the MPC (data arc: 1958 09 14 – 1960 04 21), and the JPL offers GR osculating orbit based on this data set. We additionally collected observations from Yerkes, McDonald and Skalnaté Pleso observatories published in literature, and orbits 'ba' (GR) and 'bn' (NG) are based on 95 positional measurements (data arc: 1958 09 12 – 1960 04 21). For comparison purposes, we also presented orbits (GR and NG) using only Flagstaff data set (this set gives notable better rms for both types of orbits).
This is a comet with NG effects strongly manifested in positional data fitting. Solutions 'ba' and 'bn' are based on data spanning over 1.6 yr in a range of heliocentric distances: 2.81 au – 1.63 au (perihelion) – 4.92 au.
This Oort spike comet suffers moderate planetary perturbations while passing through the planetary system; these perturbations lead to more tight future orbit (see future barycentric orbits).
Comet had its closest approach to the Earth on 19 September 1958 (1.92 au, at this moment comet was 2.74 au from the Sun) and 18 March 1959 (1.94 au, six days after its perihelion passage).The MPC cometary database presents GR orbit based of 85 positional observations (data arc: 1958 09 07 – 1960 04 21), however only 40 observations obtained in Flagstaff are available in the MPC (data arc: 1958 09 14 – 1960 04 21), and the JPL offers GR osculating orbit based on this data set. We additionally collected observations from Yerkes, McDonald and Skalnaté Pleso observatories published in literature, and orbits 'ba' (GR) and 'bn' (NG) are based on 95 positional measurements (data arc: 1958 09 12 – 1960 04 21). For comparison purposes, we also presented orbits (GR and NG) using only Flagstaff data set (this set gives notable better rms for both types of orbits).
This is a comet with NG effects strongly manifested in positional data fitting. Solutions 'ba' and 'bn' are based on data spanning over 1.6 yr in a range of heliocentric distances: 2.81 au – 1.63 au (perihelion) – 4.92 au.
This Oort spike comet suffers moderate planetary perturbations while passing through the planetary system; these perturbations lead to more tight future orbit (see future barycentric orbits).
| solution description | ||
|---|---|---|
| number of observations | 97 | |
| data interval | 1958 09 12 – 1960 04 21 | |
| data type | perihelion within the observation arc (FULL) | |
| data arc selection | entire data set (STD) | |
| range of heliocentric distances | 2.81 au – 1.63 au (perihelion) – 4.92 au | |
| detectability of NG effects in the comet's motion | comet with NG effects strongly manifested in positional data fitting | |
| type of model of motion | GR - gravitational orbit | |
| data weighting | YES | |
| number of residuals | 188 | |
| RMS [arcseconds] | 1.76 | |
| orbit quality class | 1b | |
| orbital elements (barycentric ecliptic J2000) | ||
|---|---|---|
| Epoch | 1659 02 13 | |
| perihelion date | 1959 03 11.25978233 | ± 0.00039605 |
| perihelion distance [au] | 1.62876814 | ± 0.00000182 |
| eccentricity | 0.99988051 | ± 0.00000838 |
| argument of perihelion [°] | 100.711573 | ± 0.000157 |
| ascending node [°] | 323.891874 | ± 0.000092 |
| inclination [°] | 61.167565 | ± 0.000116 |
| reciprocal semi-major axis [10-6 au-1] | 73.36 | ± 5.15 |
| file containing 5001 VCs swarm |
|---|
| 1958r1b5.bmi |
Upper panel: 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.
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
Middle panel(s): O-C diagram for a given solution (sometimes in comparison to another solution available in CODE), where residuals in right ascension are shown using magenta dots and in declination by blue open circles.
Lowest panel: Relative weights for a given data set(s).
Six 2D-projections of the 6D space of original swarm including 5001 VCs. Each density map is given in logarithmic scale presented on the right in the individual panel.