(85640) 1998 OX4 explained

Minorplanet:	yes
Background:	FFC2E0
Discovered:	26 July 1998
Alt Names:	MPO 267962
Orbit Ref:	^[1] ^[2] ^[3]
Epoch:	13 January 2016 (JD 2457400.5)
Aphelion:	2.347918212abbr=onNaNabbr=on
Perihelion:	0.81264205AU
Semimajor:	1.580280132AU
Eccentricity:	0.4857608
Period:	1.99 yr (725.60 d)
Inclination:	4.5134807°
Asc Node:	299.70814°
Arg Peri:	117.10906°
Mean Anomaly:	227.77555°
Dimensions:	300–600 m^[4]
Abs Magnitude:	21.1
Mean Motion:	/ day
Observation Arc:	3656 days (10.01 yr)
Uncertainty:	0
Moid:	0.00103632AU
Jupiter Moid:	3.03959AU

(provisional designation ) is a sub-kilometer asteroid, classified as near-Earth object and potentially hazardous asteroid of the Apollo group.

Description

It was discovered on 26 July 1998 by the Spacewatch program and subsequently lost. It was re-discovered by the Near-Earth Asteroid Tracking (NEAT) project on 31 August 2002, as . It was removed from the Sentry Risk Table on 8 August 2002. It has a well determined orbit with an observation arc of more than 10 years. It is included in the Minor Planet Center list of Potentially Hazardous Asteroids (PHAs) as it comes to within 0.05 AU of Earth periodically. It is also a Mars crossing asteroid

H < 22 asteroids passing less than 1 LD from Earth!Asteroid!Date!Nominal approach distance (LD)!Min. distance (LD)!Max. distance (LD)!Absolute magnitude (H)!Size (meters)

	1914-12-31	0.606	0.604	0.608	19.4	279–900
	1918-09-17	0.911	0.909	0.913	17.9	556–1795
	1925-08-30	0.903	0.901	0.905	18.5	443–477
	1971-04-11	0.616	0.587	0.651	21.2	122–393
	1981-11-04	0.818	0.813	0.823	21.4	111–358
	2001-11-08	0.454	0.318	3.436	20.7	153–494
	2011-11-08	0.845	0.845	0.845	21.9	320–400
	2028-06-26	0.647	0.647	0.647	18.2	921–943
	2029-04-13	0.0981	0.0963	0.1000	19.7	310–340
	2065-05-28	0.865	0.856	0.874	20.7	153–494
	2075-11-08	0.592	0.499	0.752	21.9	320–400
	2101-01-02	0.621	0.615	0.628	21.0	133–431
	2135-09-25	0.780	0.308	1.406	20.19	472–512
	2140-12-01	0.634	0.631	0.637	19.3	427–593
	2148-01-22	0.771	0.770	0.771	21.1	127–411
	2156-12-16	0.998	0.955	1.215	21.6	101–327

See also

• 99942 Apophis

Notes

• This is assuming an albedo of 0.25–0.05.

External links

• List Of Apollo Minor Planets, Minor Planet Center
• data at MPC
• List of Potentially Hazardous Asteroids (PHAs)

Notes and References

1. (85640) 1998 OX4. 2085640. 7 April 2016.
2. https://newton.spacedys.com/astdys/index.php?pc=1.1.0&n=1998+OX4 AstDys-2 on 1998 OX4
3. https://newton.spacedys.com/neodys2/index.php?pc=1.1.0&n=1998+OX4 NEODyS-2 on 1998 OX4
4. https://web.archive.org/web/20010302182040/http://neo.jpl.nasa.gov/glossary/h.html Absolute-magnitude conversion table (H)