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.[4][5] Its estimated diameter is between 15 and 23 metres.[2] This is about the same size as a hypothetical object that could have caused the Tunguska event in 1908.[6]
 2009 DD45: orbital animation of its 2009-flyby | |
| Discovery[1] | |
|---|---|
| Discovered by | SSS |
| Discovery site | Siding Spring Obs. |
| Discovery date | 27 February 2009 |
| Designations | |
| 2009 DD45 | |
| NEO · Apollo[1][2] | |
| Orbital characteristics[2] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 4[2] · 2[1] | |
| Observation arc | 7 days |
| Aphelion | 1.4952 AU |
| Perihelion | 0.9868 AU |
| 1.2410 AU | |
| Eccentricity | 0.2048 |
| 1.38 yr (505 d) | |
| 39.793° | |
| 0° 42m 46.8s / day | |
| Inclination | 13.743° |
| 161.92° | |
| 13.919° | |
| Earth MOID | 0.000339 AU (0.132 LD) |
| Physical characteristics | |
Mean diameter | 19±4 m (est. at 0.36)[2] |
| 1.2 h (poor)[2][3] | |
| 0.36 (est.)[2] | |
| SMASS = S[2] | |
| 25.8[1][2] | |
BBC News Online cites the minimum distance as 72,000 km (45,000 mi) (about 1/5 lunar distances).[6][7] 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,[6] 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.[2]
See also edit
References edit
- ^ a b c d "2009 DD45". Minor Planet Center. Retrieved 9 September 2020.
- ^ a b c d e f g h i j "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.
- ^ a b c "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 edit
- 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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