C / 565 O1
| C / 565 O1 [i] | |
|---|---|
| Properties of the orbit ( animation ) | |
| Orbit type | parabolic |
| Numerical eccentricity | 1.0 |
| Perihelion | ~ 0.83 AU |
| Inclination of the orbit plane | ~ 121 ° |
| Perihelion | ~ July 15, 565 |
| Orbital velocity in the perihelion | ~ 46 km / s |
| history | |
| Explorer | |
| Date of discovery | July 21, 565 |
| Older name | 565 |
| Source: Unless otherwise stated, the data comes from JPL Small-Body Database Browser . Please also note the note on comet articles . | |
C / 565 O1 is a comet that could be seen with the naked eye in 565 . It is counted among the " Great Comets " due to its extraordinary brightness .
Discovery and observation
The Chinese chronicles Běi Zhōu Shū and Suí Shū from the 7th century report that a "broom star" was seen for the first time on July 22nd and 23rd, 565 respectively. They agree that the comet appeared in the constellation Great Bear , probably there it was seen in the morning sky on the specified days (local time). Its tail was initially no longer than a few tenths of a degree , but gradually reached a length of 10 ° and the comet was visible in the sky for over 100 days. It was last seen in the constellation Aquarius towards the end of October , when the tail was still 2.5 ° in length.
In his cometography , Pingré gives different information about this comet: On one occasion, he mentions August 4th as the date of the first observation, in addition he cites chronicles of three different dynasties, according to which the comet first came on July 22nd, 23rd or 24th Was seen. Even Williams reported in the same way about it.
The early 9th century Italian text Agnelli Liber Pontificalis Ecclesiae Ravennatis mentions a comet that was seen shortly before the death of Justinian I , from August to the beginning of October (“Et post haec apparuit stella comis mense Augusto usque in Kalendas Octubris. Et mortuus est Iustinianus augustus… ”) The text Corpus Chronicorum Bononiensium from the 15th century moves the comet to the period 552-574, but also mentions that it appeared before Justinian's death, from August to the second half of September. Justinian died on November 14, 565.
The comet reached a magnitude of 0 to 1 mag around September 13th .
Orbit
For the comet, Johann Karl Burckhardt could only deduce the elements for two very uncertain parabolic orbits from observations over 105 days , which show the possible limits of the real orbit of the comet. They give a probable date for the point of the orbit closest to the Sun ( perihelion ) between July 9 and July 15, 565.
The data given in the info box refer to the orbit calculation for the later perihelion date. After that, the comet's orbit is inclined at around 121 ° to the ecliptic . It thus runs in the opposite direction (retrograde) like the planets through its orbit. According to these data, in perihelion it would have been with about 125 million km of the sun between the orbits of Venus and Earth . By August 30th, it would have approached Venus within 100 million km, and on September 12th it could have approached Earth within around 0.54 AU / 80 million km.
Due to the uncertain initial data, no statement can be made as to whether and, if so, when the comet could return to the inner solar system .
See also
Individual evidence
- ^ AG Pingré: Cométographie ou Traité historique et théorique des comètes. Tome I. Imprimerie Royale, Paris 1783, p. 322, 603-604 ( PDF; 56.49 MB ).
- ↑ J. Williams: Observations of Comets, from BC 611 to AD 1640. Strangeways and Walden, London 1871, p. 35 ( PDF, 20.93 MB ).
- ^ Agnellus of Ravenna: De Sancto Agnello XXVII. Paragraph 90. In: Liber Pontificalis Ecclesiae Ravennatis. James J. O'Donnell, accessed July 5, 2016 (Latin).
- ^ GW Kronk: Cometography - A Catalog of Comets, Volume 1, Ancient - 1799. Cambridge University Press, Cambridge 1999, ISBN 978-0-521-58504-0 , pp. 91-92.
- ↑ DK Yeomans: NASA JPL Solar System Dynamics: Great Comets in History. Accessed June 30, 2016 .
- ↑ C / 565 O1 in the Small-Body Database of the Jet Propulsion Laboratory (English).
- ↑ A. Vitagliano: SOLEX 11.0. Archived from the original on September 18, 2015 ; accessed on May 2, 2014 .