2009 DD45 - Asteroid - astro.wikisort.org

astro.wikisort.org - Asteroid

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
Discovery[1]
2009 DD₄₅: orbital animation of its 2009-flyby
Discovered by	SSS
Discovery site	Siding Spring Obs.
Discovery date	27 February 2009
Designations
MPC designation	2009 DD₄₅
Minor planet category	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
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^m 46.8^s / 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)[2]
Synodic rotation period	1.2 h (poor)[2][3]
Geometric albedo	0.36 (est.)[2]
Spectral type	SMASS = S[2]
Absolute magnitude (H)	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]

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!, 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
- Ephemeris · Obs prediction · Orbital info · MOID · Proper elements · Obs info · Close · Physical info · NEOCC
2009 DD45 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical Properties · Summary
2009 DD45 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

Small Solar System bodies

Minor planets

Designation Groups List Moon Meanings of names
Asteroid	Active Aten asteroid Asteroid belt Family Jupiter trojan Near-Earth Spectral types
Distant minor planet	Cis-Neptunian object Centaur Neptune trojan Damocloid Trans-Neptunian object Detached Kuiper belt Oort cloud Scattered disc

Comets

Extinct
Great
Halley-type
Hyperbolic
Long-period
Lost
Near-parabolic
Periodic
Sungrazing

Other

Cosmic dust
Meteoroids
Space debris

This near-Earth asteroid-related article is a stub. You can help Wikipedia by expanding it.

На других языках

[de] 2009 DD45

2009 DD45 ist ein etwa 35 Meter großer Asteroid, der am 2. März 2009 die Erde in einer Entfernung von rund 72.000 Kilometern passierte. Die kürzeste Erdentfernung erreichte er am 2. März um 13:40 UTC.

- [en] 2009 DD45

[es] 2009 DD45

2009 DD45 es un pequeño asteroide Apolo[1] que pasó cerca de la Tierra a una altitud de 63,500 km el 2 de marzo de 2009 a las 13:44 UTC. El asteroide fue descubierto por Robert H. McNaught desde el Observatorio de Siding Spring en Australia el 27 de febrero de 2009, tan solo tres días antes de su aproximación más cercana a la Tierra.[2][3]

[ru] 2009 DD45

2009 DD45 — астероид из категории аполлонов. Астероид был обнаружен уже на подлёте к Земле, в австралийской обсерватории Сайдинг-Спринг, а также некоторыми астрономами-любителями. 2009 DD45 был обнаружен работником обсерватории Робертом Макнотом 27 февраля 2009 года, более точные данные о его орбите были вычислены 28 февраля, то есть всего за 3 дня до подлёта астероида к Земле.

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See also