Comet Pereyra
Comet Pereyra (formal designations: C/1963 R1, 1963 V, and 1963e) was a bright comet which appeared in 1963. It was a member of the Kreutz Sungrazers, a group of comets which pass extremely close to the Sun.
 Comet Pereyra on September 23, 1963 | |
| Discovery | |
|---|---|
| Discovered by | Zenon M. Pereyra |
| Discovery date | 14 September 1963 |
| Designations | |
| C/1963 R1, 1963 V, 1963e | |
| Orbital characteristics[1] | |
| Epoch | 1963-Oct-25.0 |
| Observation arc | 86 days |
| Number of observations | 12 |
| Aphelion | 182 AU |
| Perihelion | 0.005 AU |
| Semi-major axis | 91 AU |
| Eccentricity | 0.999945 |
| Orbital period | 875 years (1800)[2] 870 years (1963) 765 years (2200)[2] |
| Inclination | 144.60° |
| 8.05° | |
| Argument of periapsis | 86.23° |
| Last perihelion | 23 August 1963 |
| Earth MOID | 0.56 AU |
| Comet nuclear magnitude (M2) | 14.3 |
Discovery
The comet was first seen on 14 September 1963, by Z.M. Pereyra of Cordoba observatory in Argentina. British observer George Alcock later reported that he had observed a thin pencil-like beam of light low in the sky on 12 September, which may have been the comet's tail.
It was bright, at apparent magnitude 2, and had a short tail about 1 degree long. Over the next few days, the comet faded rapidly, having evidently already passed perihelion, although its tail grew to about 10° in length by late September. During its short period of naked eye visibility it was widely observed throughout the southern hemisphere.
Orbital studies
As the comet receded from the Sun, orbital studies showed that Pereyra had been a sungrazing comet, passing just 60,000 kilometres from the Sun's surface. Further analysis demonstrated that it was a member of the Kreutz Sungrazers, a group of comets all descended from one very large sungrazing comet which fragmented several centuries previously.
The Kreutz Sungrazers consist of two major subgroups, which are descended from further breakups of two different fragments of the original comet. Studies have shown that Pereyra is a member of the subgroup which includes the Great Comet of 1843 and the Great Comet of 1882, although the separation of Pereyra from the larger fragment probably occurred one orbit before the two Great Comets separated.
References
- "Small-Body Database Lookup: C/1963 R1 (Pereyra)". ssd.jpl.nasa.gov.
- Horizons output. "Barycentric Osculating Orbital Elements for Comet Pereyra (C/1963 R1)". Retrieved 2023-09-02. (Solution using the Solar System's barycenter (Sun+Jupiter). Select Ephemeris Type:Elements and Center:@0)
Epoch 1800: PR= 3.197E+05 / 365.25 = 875 years
Epoch 2200: PR= 2.794E+05 / 365.25 = 765 years
Sources
- Marsden B.G. (1967), The sungrazing comet group, Astronomical Journal, v. 72, p. 1170
- Marsden B.G. (1989), The sungrazing comet group. II, Astronomical Journal, v. 98, p. 2306
- Sekanina Z. (1967), Definitive orbit of Comet Pereyra (1963 V), Bulletin of the Astronomical Institute of Czechoslovakia, v. 18, p.229
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