 2009 DD45: orbital animation of its 2009-flyby | |
| Discovery | |
|---|---|
| Discovered by | SSS |
| Discovery site | Siding Spring Obs. |
| Discovery date | 27 February 2009 |
| Designations | |
| MPC designation | 2009 DD45 |
| Minor planet category | NEO · Apollo |
| Orbital characteristics | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 4 · 2 | |
| Observation arc | 7 days |
| Aphelion | 1.4952 AU |
| Perihelion | 0.9868 AU |
| Semi-major axis | 1.2410 AU |
| Eccentricity | 0.2048 |
| Orbital period (sidereal) | 1.38 yr (505 d) |
| Mean anomaly | 39.793° |
| Mean motion | 0° 42 46.8 / day |
| Inclination | 13.743° |
| Longitude of ascending node | 161.92° |
| Argument of perihelion | 13.919° |
| Earth MOID | 0.000339 AU (0.132 LD) |
| Physical characteristics | |
| Mean diameter | 19±4 m (est. at 0.36) |
| Synodic rotation period | 1.2 h (poor) |
| Geometric albedo | 0.36 (est.) |
| Spectral type | SMASS = S |
| Absolute magnitude (H) | 25.8 |
2009 DD45 is a very small Apollo asteroid that passed near Earth at an altitude of 63,500 km (39,500 mi) on 2 March 2009 at 13:44 UTC. It was discovered by Australian astronomers with the Siding Spring Survey at the Siding Spring Observatory on 27 February 2009, only three days before its closest approach to the Earth. Its estimated diameter is between 15 and 23 metres. This is about the same size as a hypothetical object that could have caused the Tunguska event in 1908.
BBC News Online cites the minimum distance as 72,000 km (45,000 mi) (about 1/5 lunar distances). 2009 DD45 passed farther away (40 thousand miles versus 4 thousand miles) but was substantially larger than 2004 FU162, a small asteroid about 6 m (20 ft) across which came within about 6,500 km (4,000 mi) in 2004, and is more similar in size to 2004 FH. With an observation arc of 7 days and an uncertainty parameter of 3, the asteroid will make its next close encounter with Earth on 29 February 2056 and then potentially around 3 March 2067.
See also
References
- ^ "2009 DD45". Minor Planet Center. Retrieved 9 September 2020.
- ^ "JPL Small-Body Database Browser: (2009 DD45)" (2009-03-06 last obs.). Jet Propulsion Laboratory. Retrieved 9 September 2020.
- "LCDB Data for (2009+DD45)". Asteroid Lightcurve Database (LCDB). Retrieved 9 September 2020.
- Kelly Beatty (1 March 2009). "Space Rock 2009 DD45 Buzzes Earth". Sky & Telescope. Archived from the original on 6 March 2009. Retrieved 4 March 2009.
- Victoria Jaggard (2 March 2009). "Surprise Asteroid Just Buzzed Earth". National Geographic Society. Archived from the original on 4 March 2009. Retrieved 4 March 2009.
- ^ "Space rock makes close approach". BBC News Online. 3 March 2009. Archived from the original on 4 March 2009. Retrieved 3 March 2009.
- Scientific American, May 2009 issue, listed the minimum distance as 72,200 km (p. 26)
External links
- Universe Today article on 2009 DD45
- 100-meter asteroid will pass Earth Monday! Archived 3 March 2009 at the Wayback Machine, Phil Plait's Bad Astronomy blog
- NEO Asteroid 2009 DD45 from Canberra on YouTube
- List Of Apollo Minor Planets (by designation), Minor Planet Center
- 2009 DD45 at NeoDyS-2, Near Earth Objects—Dynamic Site
- 2009 DD45 at ESA–space situational awareness
- 2009 DD45 at the JPL Small-Body Database
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