(458732) 2011 MD₅

(458732) 2011 MD₅
Discovery
Discovered by	Pan-STARRS 1
Discovery site	Haleakala Obs.
Discovery date	30 June 2011
Designations
MPC designation	(458732) 2011 MD5
Alternative designations	2011 MD5
Minor planet category	NEO; Apollo;
Orbital characteristics
	Epoch 31 May 2020 (JD 2459000.5)
	Uncertainty parameter 0
Observation arc	8.67 yr (3,165 d)
Aphelion	3.9869 AU
Perihelion	0.9895 AU
Semi-major axis	2.4882 AU
Eccentricity	0.6023
Orbital period (sidereal)	3.92 yr (1,434 d)
Mean anomaly	49.188°
Mean motion	0° 15m 3.96s / day
Inclination	10.553°
Longitude of ascending node	170.34°
Argument of perihelion	224.84°
Earth MOID	0.0627 AU (24.4 LD)
Physical characteristics
Mean diameter	730–1600 m (CNEOS); 0.8 km; 1.2 km
Absolute magnitude (H)	17.8; 17.9

(458732) 2011 MD₅ is an Apollo near-Earth asteroid around 1.2 kilometers (0.75 miles) in diameter. It is the largest asteroid known to have passed closer than the Moon.^[4] On 17 September 1918 the asteroid passed 0.00234 AU (350 thousand km; 0.91 LD) from Earth^[3] with a peak apparent magnitude of around 8.4. The 1918 close approach distance is known with an accuracy of roughly ±120 km. The asteroid had come to opposition (opposite the Sun in the sky) on 9 August 1918 at magnitude 16.

2011 MD₅ was not discovered until 30 June 2011,^[1] when the asteroid was 1.3 AU (190 million km) from Earth. As of 2023, the asteroid has a 12-year observation arc and a well determined orbit.

References

^ ^a ^b "MPEC 2011-N15 : 2011 MD5". IAU Minor Planet Center. 3 July 2011. Retrieved 14 June 2020. (K11M05D)
^ ^a ^b ^c "458732 (2011 MD5)". Minor Planet Center. Retrieved 15 June 2020.
^ ^a ^b ^c ^d "JPL Small-Body Database Browser: 458732 (2011 MD5)". Jet Propulsion Laboratory. Archived from the original on 2 May 2020. Retrieved 14 June 2020.
^ ^a ^b NEO Earth Close Approaches @ JPL CNEOS
Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"
^ "LCDB Data for (458732)". Asteroid Lightcurve Database (LCDB). Retrieved 15 June 2020.

External links

(458732) 2011 MD5 at NeoDyS-2, Near Earth Objects—Dynamic Site
- Ephemerides · Observation prediction · Orbital info · MOID · Proper elements · Observational info · Close approaches · Physical info · Orbit animation
(458732) 2011 MD5 at ESA–space situational awareness
- Ephemerides · Observations · Orbit · Physical properties · Summary
(458732) 2011 MD5 at the JPL Small-Body Database
- Close approach · Discovery · Ephemeris · Orbit viewer · Orbit parameters · Physical parameters

[MPEC2011-N15-1] "MPEC 2011-N15 : 2011 MD5". IAU Minor Planet Center. 3 July 2011. Retrieved 14 June 2020. (K11M05D)

[MPC-object-2] "458732 (2011 MD5)". Minor Planet Center. Retrieved 15 June 2020.

[jpldata-3] "JPL Small-Body Database Browser: 458732 (2011 MD5)". Jet Propulsion Laboratory. Archived from the original on 2 May 2020. Retrieved 14 June 2020.

[CNEOS-4] NEO Earth Close Approaches @ JPL CNEOS
Select "Nominal dist <= 1 LD", "Past only", Sort by "H (mag)"

[lcdb-5] "LCDB Data for (458732)". Asteroid Lightcurve Database (LCDB). Retrieved 15 June 2020.

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