2009 DD45

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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)
.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)
Jupiter Tisserand parameter 5.122
Physical characteristics
Dimensions 19 ± 4 meters (assumed)[1]
1.2 h (0.050 d)[1]
S[1]
25.8
Астероид 2009 DD45.gif

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[edit]

  1. ^ 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. 
  2. ^ Kelly Beatty (2009-03-01). "Space Rock 2009 DD45 Buzzes Earth". Sky & Telescope. Retrieved 2009-03-04. 
  3. ^ 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. 
  4. ^ 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. 
  5. ^ Scientific American, May 2009 issue, listed the minimum distance as 72,200 km (p. 26)

External links[edit]