2009 DD45
| Discovery | |
|---|---|
| Discovery date | February 27, 2009 |
| Designations | |
| Apollo NEO[1] | |
| Orbital characteristics[1] | |
| Epoch 13 January 2016 (JD 2457400.5) | |
| Uncertainty parameter 2 | |
| Aphelion | 1.495206 AU (223.6796 Gm) |
| Perihelion | 0.98664198 AU (147.599539 Gm) |
| 1.240924 AU (185.6396 Gm) | |
| Eccentricity | 0.204913 |
| 1.38 yr (504.91 d) | |
Average orbital speed | .713018 °/d |
| 338.8474° | |
| 0° 42m 46.781s / day | |
| Inclination | 13.74426° |
| 161.937243° | |
| 13.91345° | |
| Earth MOID | 0.000315545 AU (47,204.9 km) |
| Jupiter MOID | 3.47225 AU (519.441 Gm) |
| TJupiter | 5.122 |
| Physical characteristics | |
| Dimensions | 19 ± 4 meters (assumed)[1] |
| 1.2 h (0.050 d)[1] | |
| S[1] | |
| 25.8 | |
2009 DD45 is a small Apollo asteroid[1] 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 at the Siding Spring Observatory on 27 February 2009, only three days before its closest approach to the Earth.[2][3] Its estimated diameter is between 15 and 23 metres.[1] This is about the same size as a hypothetical object that could have caused the Tunguska event in 1908.[4]
BBC News Online cites the minimum distance as 72,000 km (45,000 mi) (about 1/5 lunar distances).[4][5] 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,[4] and is more similar in size to 2004 FH. With an uncertainty parameter of 3, the asteroid is predicted to make its next close encounters with Earth on 2056-Feb-29 and 2067-Mar-03.[1]
References
- ^ a b c d e f g h "JPL Small-Body Database Browser (2009 DD45)" (last obs. used 2009-03-06). Jet Propulsion Laboratory. Retrieved 11 April 2016.
- ^ Kelly Beatty (2009-03-01). "Space Rock 2009 DD45 Buzzes Earth". Sky & Telescope. Archived from the original on 6 March 2009. Retrieved 2009-03-04.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ Victoria Jaggard (2009-03-02). "Surprise Asteroid Just Buzzed Earth". National Geographic Society. Archived from the original on 4 March 2009. Retrieved 2009-03-04.
{{cite web}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ a b c "Space rock makes close approach". BBC News Online. 2009-03-03. Archived from the original on 4 March 2009. Retrieved 2009-03-03.
{{cite news}}: Unknown parameter|deadurl=ignored (|url-status=suggested) (help) - ^ Scientific American, May 2009 issue, listed the minimum distance as 72,200 km (p. 26)
External links
- 2009 DD45 at the JPL Small-Body Database
- Universe Today article on 2009 DD45
- 100 meter asteroid will pass Earth Monday!, Phil Plait's Bad Astronomy blog
- NEO Asteroid 2009 DD45 from Canberra on YouTube
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