(410777) 2009 FD

(410777) 2009 FD
	Arecibo Observatory radar images of 2009 FD
Discovery
Discovered by	Spacewatch
Discovery site	Kitt Peak National Obs.
Discovery date	24 February 2009
Designations
MPC designation	(410777) 2009 FD
Alternative designations	2009 FD
Minor planet category	Apollo; NEO; PHA;
Orbital characteristics
	Epoch 3 July 2013 (JD 2456476.5)
	Uncertainty parameter 0
Observation arc	6.77 yr (2,471 days)
Aphelion	1.7361 AU
Perihelion	0.5896 AU
Semi-major axis	1.1629 AU
Eccentricity	0.4929
Orbital period (sidereal)	1.25 yr (458 days)
Mean anomaly	98.579°
Mean motion	0° 47m 9.6s / day
Inclination	3.1366°
Longitude of ascending node	9.5523°
Argument of perihelion	281.24°
Known satellites	1
Earth MOID	0.0025 AU (1 LD)
Physical characteristics
Mean diameter	0.113 km (calculated); 0.150 km; 0.472 km; Primary: 120–180 m; Secondary: 60–120 m;
Mass	8.3×1010 kg (assumed)
Synodic rotation period	2.5 h (at least); 4.0 h; 5.87±0.02 h; 6.22±0.41 h;
Geometric albedo	0.01; 0.20 (assumed);
Spectral type	C; S (assumed);
Absolute magnitude (H)	22.1

(410777) 2009 FD is a carbonaceous sub-kilometer asteroid and binary system,^[6]^[3] classified as near-Earth object and potentially hazardous asteroid of the Apollo group, discovered on 24 February 2009 by astronomers of the Spacewatch program at Kitt Peak National Observatory near Tucson, Arizona, in the United States.^[2]

Until 2019, the asteroid's modelled orbit placed it at risk of a possible future collision with Earth in 2185. With a Palermo Technical Impact Hazard Scale rating of -0.44, it had the fifth highest impact threat^[b] of all known asteroids based on its estimated diameter, kinetic yield, impact probability, and time interval.^[12] Observations to 2019 extended the observation arc by four years and detected a favourable Yarkovsky effect, which ruled out impact in 2185.^[13] Using observations from 16 November 2020, the asteroid was removed from the Sentry risk table on 19 November 2020.

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