Astronomy:1993 DA
| Discovery[1][2] | |
|---|---|
| Discovered by | Spacewatch |
| Discovery site | Kitt Peak Obs. |
| Discovery date | 17 February 1993 |
| Designations | |
| 1993 DA | |
| Minor planet category | Aten · NEO[1] |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 6 | |
| Observation arc | (5 days) |
| |{{{apsis}}}|helion}} | 1.0231 AU |
| |{{{apsis}}}|helion}} | 0.8491 AU |
| 0.9361 AU | |
| Eccentricity | 0.0929 |
| Orbital period | 0.91 yr (331 days) |
| Mean anomaly | 228.74° |
| Mean motion | 1° 5m 17.52s / day |
| Inclination | 12.385° |
| Longitude of ascending node | 329.05° |
| 354.06° | |
| Earth MOID | 0.0355 AU · 13.8 LD |
| Physical characteristics | |
| Dimensions | 13–30 m[3] |
| Absolute magnitude (H) | 26.4[1] |
1993 DA is a sub-kilometer asteroid, classified as a near-Earth object of the Aten group. It has only been observed during 5 days in February 1993, and not been detected ever since. The small body measures approximately 20 meters in diameter based on an absolute magnitude of 26.4, and has an Earth minimum orbital intersection distance of 13.8 lunar distances or 0.0355 astronomical unit|AU (5,310,000 km).[1][2]
Orbit
1993 DA was first observed on 17 February 1993, by the Spacewatch survey at Kitt Peak Observatory in Arizona, United States.[2] From 1993 to 1998, it was the asteroid with the lowest known aphelion at 1.023 AU, and was thus the closest thing to an Apohele asteroid known at the time. It currently orbits the Sun at a distance of 0.8–1.0 AU once every 11 months (331 days). Its orbit has an eccentricity of 0.09 and an inclination of 12° with respect to the ecliptic.[1]
Description
The orbit of 1993 DA brings it during the years 1900–2200 as close as 0.034 astronomical unit|AU (5,100,000 km; 3,200,000 mi) of the Earth (on 19 February 1993) and as close as 0.13 astronomical unit|AU (19,000,000 km; 12,000,000 mi) of Venus (on 15 October 1933, and 30 September 2077).[4] For comparison, the distance to the Moon is about 0.0026 AU (384,400 km). Because the orbit was determined with only 5 days worth of observations, the orbit of 1993 DA has an uncertainty of 6 on a scale of 0 to 9, with 0 being the most certain, and 9 being the most uncertain. This uncertainty is common for small asteroids that are difficult to observe.[1]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 "JPL Small-Body Database Browser: (1993 DA)". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3092114. Retrieved 2 August 2017.
- ↑ 2.0 2.1 2.2 "1993 DA". Minor Planet Center. http://www.minorplanetcenter.net/db_search/show_object?object_id=1993+DA. Retrieved 2 August 2017.
- ↑ "H (absolute magnitude)". NASA Jet Propulsion Laboratory. https://cneos.jpl.nasa.gov/glossary/h.html. Retrieved 10 October 2020.
- ↑ "JPL Small-Body Database Browser: (1993 DA) – Close-Approach Data". Jet Propulsion Laboratory. http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=1993%20DA;cad=1#cad. Retrieved 2015-06-05.
External links
- List Of Aten Minor Planets (by designation), Minor Planet Center
- 1993 DA at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
- 1993 DA at ESA–space situational awareness
- 1993 DA at the JPL Small-Body Database
 |  |
