(5645) 1990 SP

(5645) 1990 SP
Discovery
Discovered by	R. H. McNaught
Discovery site	Siding Spring Obs.
Discovery date	20 September 1990
Designations
MPC designation	(5645) 1990 SP
Alternative designations	1990 SP
Minor planet category	Apollo · NEO
Orbital characteristics
	Epoch 4 September 2017 (JD 2458000.5)
	Uncertainty parameter 0
Observation arc	40.89 yr (14,935 days)
Aphelion	1.8798 AU
Perihelion	0.8302 AU
Semi-major axis	1.3550 AU
Eccentricity	0.3873
Orbital period (sidereal)	1.58 yr (576 days)
Mean anomaly	339.42°
Mean motion	0° 37m 29.64s / day
Inclination	13.507°
Longitude of ascending node	45.762°
Argument of perihelion	48.178°
Earth MOID	0.0537 AU
Physical characteristics
Dimensions	1.648 km; 1.65 km (taken); 1.668±0.018 km; 1.849±0.334 km; 2.20±0.74 km
Synodic rotation period	30.39±0.04 h
Geometric albedo	0.06±0.08; 0.062±0.079; 0.068±0.032; 0.0827; 0.121±0.022
Spectral type	P · CXT · S
Absolute magnitude (H)	16.75±0.2 (R) · 16.8 · 17.1 · 17.20±0.3 · 17.24±0.206

(5645) 1990 SP is an eccentric and tumbling asteroid, classified as near-Earth object of the Apollo group, approximately 1.7 kilometers in diameter. It was discovered on 20 September 1990, by Scottish–Australian astronomer Robert McNaught at the Siding Spring Observatory in Canberra, Australia.^[2] Scientists have said that it has a '1 in 364 billion chance' of colliding with the Earth.

^ ^a ^b ^c Cite error: The named reference jpldata was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference MPC-5645 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Pravec-2012b was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference lcdb was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference WISE was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Mainzer-2011 was invoked but never defined (see the help page).
^ ^a ^b ^c Cite error: The named reference Mainzer-2012 was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Mueller-2011a was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Pravec-2005a was invoked but never defined (see the help page).
^ ^a ^b Cite error: The named reference Thomas-2011b was invoked but never defined (see the help page).
^ Cite error: The named reference Thomas-2014 was invoked but never defined (see the help page).

[jpldata-1] Cite error: The named reference jpldata was invoked but never defined (see the help page).

[MPC-5645-2] Cite error: The named reference MPC-5645 was invoked but never defined (see the help page).

[Pravec-2012b-3] Cite error: The named reference Pravec-2012b was invoked but never defined (see the help page).

[lcdb-4] Cite error: The named reference lcdb was invoked but never defined (see the help page).

[WISE-5] Cite error: The named reference WISE was invoked but never defined (see the help page).

[Mainzer-2011-6] Cite error: The named reference Mainzer-2011 was invoked but never defined (see the help page).

[Mainzer-2012-7] Cite error: The named reference Mainzer-2012 was invoked but never defined (see the help page).

[Mueller-2011a-8] Cite error: The named reference Mueller-2011a was invoked but never defined (see the help page).

[Pravec-2005a-9] Cite error: The named reference Pravec-2005a was invoked but never defined (see the help page).

[Thomas-2011b-10] Cite error: The named reference Thomas-2011b was invoked but never defined (see the help page).

[Thomas-2014-11] Cite error: The named reference Thomas-2014 was invoked but never defined (see the help page).

[1]

[2]

[3]

[4]

[5]

[6]

[7]

[8]

[9]

[10]

[11]

(5645) 1990 SP

From Wikipedia, the free encyclopedia · View on Wikipedia