Neith (hypothetical moon)
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Neith is a hypothetical natural satellite of Venus reportedly sighted by Giovanni Cassini in 1672 and by several other astronomers in following years. It was 'observed' up to 30 times by astronomers until 1770, when there were no new sightings and it was not found during the transit of Venus in 1761 and 1769.[1]
Discovery
In 1672, Giovanni Cassini found a small object close to Venus. He did not take great note of his observation, but when he saw it again in 1686, he made a formal announcement of a possible moon of Venus. The object was seen by many other
Summary of sightings
Year | City | Person | Number of sightings |
---|---|---|---|
1645 | Naples | Francesco Fontana | 3 |
1646 | Naples | Francesco Fontana | 1 |
1672 | Paris | Giovanni Domenico Cassini | 1 |
1686 | Paris | Giovanni Domenico Cassini | 1 |
1740 | London | James Short | 1 |
1759 | Greifswald | Andreas Mayer | 1 |
1761 | Marseilles | Joseph Lagrange |
3 |
1761 | Limoges | Jacques Montaingne | 4 |
1761 | St. Neots | unknown | 1 |
1761 | Greifswald | Friedrich Artzt | 1 |
1761 | Krefeld | Abraham Scheuten | 2 |
1761 | Copenhagen | Peter Roedkiær | 8 |
1764 | Copenhagen | Peter Roedkiær | 2 |
1764 | Copenhagen | Christian Horrebow and others | 3 |
1764 | Auxerre | Marian | 3 |
1768 | Copenhagen | Christian Horrebow | 1 |
Observations
Many astronomers failed to find any moon during their observations of Venus, including
In 1884, Jean-Charles Houzeau, the former director of the Royal Observatory of Brussels suggested that the "moon" was actually a planet which orbited the Sun every 283 days. Such a planet would be in conjunction with Venus every 1080 days, which fit with the recorded observations. Houzeau was also the first to give the object the name Neith, after an Egyptian goddess.
The
See also
- List of hypothetical astronomical objects
- 524522 Zoozve, a quasi-satellite of Venus
- trojanof Venus
- Venus
References
- ISBN 978-3-7643-8908-6.
- ^ Stevenson, David (2014). "Making the Moon" (PDF). Physics Today: 37. Retrieved 1 May 2022.