2009 DD45
{{DISPLAYTITLE:{{mp|2009 DD|45}}}}
{{Use dmy dates|date=September 2020}}
{{Infobox planet
| minorplanet = yes
| name = {{mp|2009 DD|45}}
| background = #FFC2E0
| image = Астероид 2009 DD45.gif
| image_scale =
| caption = {{mp|2009 DD|45}}: orbital animation of its 2009-flyby
| discoverer = SSS
| discovery_site = Siding Spring Obs.
| discovered = 27 February 2009
| mpc_name = {{mp|2009 DD|45}}
| alt_names =
| pronounced =
| named_after =
| mp_category = NEO{{·}}Apollo
| epoch = 31 May 2020 (JD 2459000.5)
| observation_arc = 7 days
| aphelion = 1.4952 AU
| perihelion = 0.9868 AU
| semimajor = 1.2410 AU
| eccentricity = 0.2048
| period = 1.38 yr (505 d)
| mean_anomaly = 39.793°
| mean_motion = {{Deg2DMS|0.7130|sup=ms}} / day
| inclination = 13.743°
| asc_node = 161.92°
| arg_peri = 13.919°
| moid = {{convert|0.000339|AU|LD|abbr=on|lk=on|sigfig=3}}
| mean_diameter = {{val|19|4|u=m}} {{small|(est. at 0.36)}}
| rotation = {{val|1.2|ul=h}} {{small|(poor)}}
| albedo = 0.36 {{small|(est.)}}
| spectral_type = SMASS {{=}} S
}}
{{mp|2009 DD|45}} is a very small Apollo asteroid that passed near Earth at an altitude of {{convert|63,500|km|mi|abbr=on}} 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 {{convert|72,000|km|mi|abbr=on}} (about 1/5 lunar distances).Scientific American, May 2009 issue, listed the minimum distance as 72,200 km (p. 26) {{mp|2009 DD|45}} 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 {{convert|6,500|km|mi|abbr=on}} 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
{{reflist|30em|refs=
|type = 2009-03-06 last obs.
|title = JPL Small-Body Database Browser: (2009 DD45)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=3448992
|publisher = Jet Propulsion Laboratory
|accessdate = 9 September 2020}}
|title = 2009 DD45
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=2009+DD45
|accessdate = 9 September 2020}}
|title = LCDB Data for (2009+DD45)
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=2009+DD45
|accessdate = 9 September 2020}}
{{cite web|url=http://www.skyandtelescope.com/community/skyblog/observingblog/40504617.html|title=Space Rock 2009 DD45 Buzzes Earth|date=2009-03-01|author=Kelly Beatty|publisher=Sky & Telescope|accessdate=2009-03-04|archive-url=https://archive.today/20090306071211/http://www.skyandtelescope.com/community/skyblog/observingblog/40504617.html|archive-date=6 March 2009|url-status=dead}}
{{cite web|url=http://news.nationalgeographic.com/news/2009/03/090302-asteroid-earth.html|title=Surprise Asteroid Just Buzzed Earth|date=2009-03-02|author=Victoria Jaggard|publisher=National Geographic Society|accessdate=2009-03-04| archiveurl= https://web.archive.org/web/20090304084808/http://news.nationalgeographic.com/news/2009/03/090302-asteroid-earth.html| archivedate= 4 March 2009 | url-status=dead}}
{{cite news|url=http://news.bbc.co.uk/1/hi/sci/tech/7921279.stm|title=Space rock makes close approach|date=2009-03-03|publisher=BBC News Online|accessdate=2009-03-03| archiveurl= https://web.archive.org/web/20090304094851/http://news.bbc.co.uk/1/hi/sci/tech/7921279.stm| archivedate= 4 March 2009 | url-status=live}}
}}
External links
- [http://www.universetoday.com/2009/03/02/asteroid-2009-dd45-just-buzzed-by-earth/ Universe Today article on 2009 DD45]
- [http://blogs.discovermagazine.com/badastronomy/2009/03/01/100-meter-asteroid-will-pass-earth-monday/ 100-meter asteroid will pass Earth Monday!] {{Webarchive|url=https://web.archive.org/web/20090303153932/http://blogs.discovermagazine.com/badastronomy/2009/03/01/100-meter-asteroid-will-pass-earth-monday/ |date=3 March 2009 }}, Phil Plait's Bad Astronomy blog
- {{YouTube|_RKKgMDK7A4|NEO Asteroid 2009 DD45 from Canberra}}
- [https://www.minorplanetcenter.net/iau/lists/t_apollos.html List Of Apollo Minor Planets (by designation)], Minor Planet Center
- {{NeoDys|2009+DD45}}
- {{ESA-SSA|2009DD45}}
- {{JPL small body}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:2009 DD45}}
Category:Minor planet object articles (unnumbered)
{{NE-asteroid-stub}}