Close Approach Data
| Date | Miss Distance | Speed |
|---|---|---|
| February 18, 1902 | 0.0659 AU (9.9 million km) | 15.7 km/s |
| August 27, 1910 | 0.0489 AU (7.3 million km) | 13.9 km/s |
| April 11, 1914 | 0.1787 AU (26.7 million km) | 18.8 km/s |
| August 20, 1921 | 0.1379 AU (20.6 million km) | 19.0 km/s |
| October 22, 1922 | 0.1184 AU (17.7 million km) | 15.5 km/s |
| April 2, 1925 | 0.1333 AU (19.9 million km) | 13.4 km/s |
| May 11, 1927 | 0.0653 AU (9.8 million km) | 15.8 km/s |
| August 27, 1944 | 0.0562 AU (8.4 million km) | 13.6 km/s |
| January 13, 1948 | 0.1229 AU (18.4 million km) | 14.2 km/s |
| April 12, 1948 | 0.1893 AU (28.3 million km) | 19.2 km/s |
| August 3, 1952 | 0.0700 AU (10.5 million km) | 17.6 km/s |
| August 22, 1955 | 0.1058 AU (15.8 million km) | 18.1 km/s |
| April 5, 1959 | 0.1218 AU (18.2 million km) | 14.6 km/s |
| May 26, 1963 | 0.1467 AU (22.0 million km) | 19.9 km/s |
| December 8, 1967 | 0.1038 AU (15.5 million km) | 13.8 km/s |
| October 30, 1977 | 0.1415 AU (21.2 million km) | 22.0 km/s |
| August 29, 1978 | 0.1440 AU (21.5 million km) | 11.3 km/s |
| August 19, 1988 | 0.1191 AU (17.8 million km) | 15.4 km/s |
| August 25, 1989 | 0.0269 AU (4.0 million km) | 15.6 km/s |
| March 7, 1993 | 0.0679 AU (10.2 million km) | 15.5 km/s |
| April 8, 1993 | 0.1319 AU (19.7 million km) | 16.4 km/s |
| August 28, 2012 | 0.1135 AU (17.0 million km) | 12.1 km/s |
| November 6, 2013 | 0.1275 AU (19.1 million km) | 18.0 km/s |
| May 22, 2018 | 0.0945 AU (14.1 million km) | 14.0 km/s |
| August 22, 2023 | 0.1100 AU (16.5 million km) | 18.2 km/s |
| April 4, 2027 | 0.1288 AU (19.3 million km) | 13.8 km/s |
| April 8, 2028 | 0.1099 AU (16.4 million km) | 20.3 km/s |
| August 2, 2043 | 0.1348 AU (20.2 million km) | 13.8 km/s |
| August 26, 2046 | 0.0251 AU (3.8 million km) | 14.7 km/s |
| December 7, 2048 | 0.1367 AU (20.4 million km) | 12.5 km/s |
| April 11, 2050 | 0.1558 AU (23.3 million km) | 17.8 km/s |
| June 27, 2053 | 0.0830 AU (12.4 million km) | 18.5 km/s |
| August 19, 2057 | 0.1649 AU (24.7 million km) | 19.8 km/s |
| April 1, 2061 | 0.1447 AU (21.6 million km) | 12.7 km/s |
| April 16, 2064 | 0.1436 AU (21.5 million km) | 19.6 km/s |
| October 29, 2068 | 0.1056 AU (15.8 million km) | 13.8 km/s |
| September 20, 2078 | 0.1313 AU (19.6 million km) | 21.4 km/s |
| August 27, 2080 | 0.0618 AU (9.2 million km) | 13.5 km/s |
| April 13, 2084 | 0.1975 AU (29.6 million km) | 19.5 km/s |
| July 11, 2089 | 0.1198 AU (17.9 million km) | 15.3 km/s |
| August 23, 2091 | 0.0894 AU (13.4 million km) | 17.6 km/s |
| January 30, 2094 | 0.0665 AU (10.0 million km) | 16.7 km/s |
| April 6, 2095 | 0.1223 AU (18.3 million km) | 15.0 km/s |
| March 28, 2106 | 0.1986 AU (29.7 million km) | 10.6 km/s |
| June 4, 2109 | 0.1163 AU (17.4 million km) | 13.7 km/s |
| August 30, 2114 | 0.1766 AU (26.4 million km) | 10.6 km/s |
| April 29, 2119 | 0.1354 AU (20.3 million km) | 21.6 km/s |
| August 28, 2125 | 0.0286 AU (4.3 million km) | 14.6 km/s |
| April 13, 2129 | 0.1758 AU (26.3 million km) | 18.6 km/s |
| February 19, 2130 | 0.1234 AU (18.5 million km) | 14.3 km/s |
| September 11, 2134 | 0.0847 AU (12.7 million km) | 18.6 km/s |
| August 24, 2136 | 0.0902 AU (13.5 million km) | 17.6 km/s |
| April 8, 2140 | 0.1241 AU (18.6 million km) | 15.5 km/s |
| July 5, 2145 | 0.1199 AU (17.9 million km) | 15.8 km/s |
| August 20, 2147 | 0.1990 AU (29.8 million km) | 20.8 km/s |
| January 25, 2150 | 0.0691 AU (10.3 million km) | 17.1 km/s |
| April 2, 2151 | 0.1541 AU (23.1 million km) | 12.3 km/s |
| November 19, 2160 | 0.1274 AU (19.1 million km) | 17.8 km/s |
| June 9, 2165 | 0.0708 AU (10.6 million km) | 15.4 km/s |
| August 31, 2170 | 0.1650 AU (24.7 million km) | 10.8 km/s |
| October 20, 2180 | 0.0957 AU (14.3 million km) | 14.0 km/s |
| August 29, 2181 | 0.0528 AU (7.9 million km) | 13.8 km/s |
| August 26, 2192 | 0.0475 AU (7.1 million km) | 16.3 km/s |
| March 4, 2196 | 0.1086 AU (16.3 million km) | 13.8 km/s |
| April 10, 2196 | 0.1363 AU (20.4 million km) | 16.7 km/s |
Potentially Hazardous Asteroid
4769 Castalia (1989 PB) is classified as a Potentially Hazardous Asteroid (PHA) because it is estimated to be larger than 140 meters and its orbit comes within 0.05 AU of Earth. NASA continuously monitors this object for any future impact risk. Current data does not indicate a confirmed impact event.
Asteroid
4769 Castalia is a near-Earth object and potentially hazardous asteroid of the Apollo group, approximately 1.4 kilometers in diameter and was the first asteroid to be modeled by radar imaging. It was discovered on 9 August 1989, by American astronomer Eleanor Helin (Caltech) on photographic plates taken at Palomar Observatory in California. It is named after Castalia, a nymph in Greek mythology. It is also a Mars- and Venus-crosser asteroid.
Frequently Asked Questions
Is 4769 Castalia (1989 PB) dangerous?โพ
4769 Castalia (1989 PB) is classified as a potentially hazardous asteroid (PHA) by NASA. This means it is large enough and its orbit brings it close enough to Earth to warrant close monitoring. However, a PHA classification does not mean an impact is imminent.
How close will 4769 Castalia (1989 PB) come to Earth?โพ
The closest recorded Earth approach of 4769 Castalia (1989 PB) is 0.0489 AU (7.3 million km) on August 27, 1910, at a speed of approximately 13.9 km/s.
How big is 4769 Castalia (1989 PB)?โพ
4769 Castalia (1989 PB) has an estimated diameter of 1.42 km (880โ1968 meters range). Its absolute magnitude (H) is 17.4, which NASA uses along with assumed albedo to estimate size.