C / 1468 S1
| C / 1468 S1 [i] | |
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | parabolic |
| Numerical eccentricity | 1.0 |
| Perihelion | 0.850 AU |
| Inclination of the orbit plane | 138 ° |
| Perihelion | October 7, 1468 |
| Orbital velocity in the perihelion | 46 km / s |
| history | |
| Explorer | |
| Date of discovery | September 17, 1468 |
| Older name | 1468 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . Please also note the note on comet articles . | |
C / 1468 S1 was a comet that could be seen with the naked eye in 1468 . It is counted among the " Great Comets " due to its extraordinary brightness .
Discovery and Visibility
The comet was discovered by Chinese astronomers on the morning of September 18, 1468 (local time). Four days later, the comet had moved northeast, it was blue-white in color, and its tail pointed southwest and was 30 degrees long. In October the comet was observed in the evening sky. At the beginning of November the size of the comet decreased somewhat and on November 18th it was observed for the last time.
In Japan the comet was sighted in the east on September 21st at 2 a.m., its 10 ° long tail pointed to the southwest. The observations could be continued until October 20th.
In Europe the comet was reported in a contemporary treatise: it appeared in September, October and November. Its color was a pale blue, it had a long tail that rose constantly while its head was low. In mid to late September it was circumpolar , moving through the Great Bear . In England , the comet was observed from late September to early November.
The comet reached a brightness of 1 to 2 mag on October 2nd .
Orbit
For the comet, only an uncertain parabolic orbit could be determined due to the few observations made , which is inclined by around 138 ° to the ecliptic . It thus runs in the opposite direction (retrograde) like the planets through its orbit. At the point of the orbit closest to the sun ( perihelion ), which the comet traversed around October 7, 1468, it was located at a distance of about 127 million km between the orbit of Venus and the earth . By October 1st it had already come close to the earth to about 0.69 AU / 100 million km. Around October 7th, it still approached Venus within about 92 million km.
Although attempts have been made to associate the comet with other historical comets (e.g. C / 1337 M1) and ascribe to it an orbital period of 132 years, it may no longer become part of the comet or only after many tens or hundreds of thousands of years return inner solar system .
See also
Individual evidence
- ^ AG Pingré: Cométographie ou Traité historique et théorique des comètes . Tome I, Paris, 1783, pp. 352-353.
- ^ GW Kronk: Cometography - A Catalog of Comets, Volume 1. Ancient - 1799 . Cambridge University Press, 1999, ISBN 978-0-521-58504-0 , pp. 282-284.
- ^ Donald K. Yeomans: NASA JPL Solar System Dynamics: Great Comets in History. Retrieved June 9, 2014 .
- ↑ C / 1468 S1 in the Small-Body Database of the Jet Propulsion Laboratory (English).
- ↑ SOLEX 11.0 A. Vitagliano. Archived from the original on September 18, 2015 ; accessed on May 2, 2014 .
- ^ I. Hasegawa, S. Nakano: Periodic Comets Found in Historical Records . In: Publications of the Astronomical Society of Japan , Vol. 47, 1995, pp. 699-710. ( bibcode : 1995PASJ ... 47..699H )