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Encyclopedia > Carl A. Wirtanen

Carl Alvar Wirtanen (19101990) was an American astronomer who worked at Lick Observatory. 1910 was a common year starting on Saturday (see link for calendar). ... 1990 is a common year starting on Monday of the Gregorian calendar. ... An astronomer or astrophysicist is a scientist whose area of research is astronomy or astrophysics. ... The Lick Observatory is an astronomical observatory, owned and operated by the University of California. ...

He discovered periodic comet 46P/Wirtanen, as well as eight asteroids, including notably the Apollo asteroid (29075) 1950 DA, which is considered to have a non-negligible risk of impacting the earth in the year 2880. He also discovered two other Apollo asteroids: 1685 Toro and 1863 Antinous. Comet Hale-Bopp, showing a white dust tail and blue gas tail (February 1997) A comet is a small astronomical object similar to an asteroid but composed largely of ice. ... 46P/Wirtanen is a short-periodic comet with a current orbital period of 5. ... An asteroid is a small, solid object in our Solar System, orbiting the Sun. ... The Apollo asteroids are a group of near-Earth asteroids named after 1862 Apollo, the first asteroid of this group to be discovered. ... Asteroid 1950 DA (29075) 1950 DA is an asteroid considered to be the near Earth object with the highest known likelihood of crashing into Earth, according to the Palermo Technical Impact Hazard Scale. ... (Redirected from 2880) (28th century - 29th century - 30th century - more centuries) The 29th century (Gregorian Calendar) comprises the years 2801-2900. ...

Asteroids discovered: 8
1600 Vyssotsky October 22, 1947
1685 Toro July 17, 1948
1747 Wright July 14, 1947
1863 Antinous March 7, 1948
1951 Lick July 26, 1949
2044 Wirt November 8, 1950
6107 Osterbrock January 14, 1948
(29075) 1950 DA February 22, 1950



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