(53319) 1999 JM 8 is a small near - Earth asteroid from the Apollo group, which is characterized by an extremely elongated orbit, with an eccentricity of almost 0.65, which allows it to significantly change its distance from the Sun, crossing not only the Earth 's orbit, but also Mars . It was opened on May 13, 1999 as part of the LINEAR project at the Socorro Observatory.
- Orbit of asteroid 1999 JM8 and its position in the solar system
| (53319) 1999 JM 8 | |
|---|---|
| Asteroid | |
 | |
| Opening | |
| Discoverer | LINEAR |
| Detection point | Socorro |
| Date of discovery | May 13, 1999 |
| Alternative designations | 1999 JM 8 ; 1990 HD 1 |
| Category | NEA ( Apollo ) |
| Orbital characteristics | |
| The Age of August 27, 2011 JD 2455800.5 | |
| Eccentricity ( e ) | 0.64892 |
| Semi-axis ( a ) | 405.084 million km (2,70782 a. E.) |
| Perihelion ( q ) | 142.217 million km (0.95066 a. E.) |
| Afhelia ( Q ) | 667.951 million km (4,46498 a. E.) |
| Period of circulation ( P ) | 1627,527 days (4,456 g. ) |
| Average orbital speed | 16.004 km / s |
| Inclination ( i ) | 13.829 ° |
| Ascending node longitude (Ω) | 133.901 ° |
| Perihelion Argument (ω) | 166.304 ° |
| Mean Anomaly ( M ) | 255.487 ° |
| physical characteristics | |
| Diameter | 7.0 km |
| Rotation period | 136 h |
| Apparent magnitude | 22.21 m (current) |
| Absolute magnitude | 15,112 m |
| Current distance from the Sun | 4,462 a. e. |
| Current distance from Earth | 5,474 a. e. |
Like the asteroid (4179) Tautatis , this asteroid has an extremely slow rotational speed around its axis - one revolution takes more than 5.6 days (136 hours), which may be due to the influence of the YORP effect . The YORP effect is a consequence of the Yarkovsky effect and is reflected in a change in the speed of rotation of small irregular asteroids under the action of the pressure of solar radiation reradiated by the cooling surface of the asteroid.
This asteroid completely intersects the Earth's orbits, which allows it to be classified as “potentially dangerous objects” . Over the past hundred years, this asteroid has flown at least 5 times past the Earth at a distance closer than 30 million km, and in 1990 it moved closer to a distance of 5 million km. However, in the next 100 years no serious concerns are associated with it, since in the 21st century its maximum approach to the Earth will not exceed 38.3 million km, and even that will not take place soon, only in 2075.
Radar observations of the asteroid (53319) 1999 JM 8 at the Goldstone and Arecibo observatories made it possible to determine its approximate diameter, which turned out to be about 7 km, and also to obtain several radar images. On them you can see that the asteroid has a rather bizarre shape, somewhat reminiscent of the shape of the body of a chicken.
See also
- List of asteroids ( 53301-53400 )
- Small Planet Classifications
- List of asteroids crossing the Earth's orbit
- List of asteroids crossing the orbit of Mars