(196256) 2003 EH1

(196256) 2003 EH₁ is an asteroid, classified as near-Earth object of the Amor group. It was discovered on 6 March 2003, by astronomers of the LONEOS program at Anderson Mesa Station near Flagstaff, Arizona, in the United States.^[2][4] Peter Jenniskens (2003–2004) proposed that it is the parent body of the Quadrantid meteor shower.^[5][6] 2003 EH₁ is likely an extinct comet and may even be related to the comet C/1490 Y1. 2003 EH₁ came to perihelion on 12 March 2014.^[1]

The orbit of 2003 EH1

(196256) 2003 EH₁

Discovery[1][2]
Discovered by	LONEOS
Discovery date	6 March 2003
Designations
MPC designation	(196256) 2003 EH1
Minor planet category	NEO · Amor[1] extinct comet
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc	4035 days (11.05 yr)
Aphelion	5.055446 AU (756.2840 Gm) (Q)
Perihelion	1.190060 AU (178.0304 Gm) (q)
Semi-major axis	3.12275 AU (467.157 Gm) (a)
Eccentricity	0.618907 (e)
Orbital period (sidereal)	5.52 yr (2015.6 d)
Mean anomaly	119.8736° (M)
Mean motion	0° 10m 42.984s / day (n)
Inclination	70.865968° (i)
Longitude of ascending node	282.972499° (Ω)
Argument of perihelion	171.3709° (ω)
Earth MOID	0.21143 AU (31.629 Gm)
Jupiter MOID	0.231939 AU (34.6976 Gm)
TJupiter	2.065
Physical characteristics
Dimensions	2.6–4.0 km (1.6–2.5 mi)†
Sidereal rotation period	12.650±0.033 h[3]
Absolute magnitude (H)	16.2[1]

Notes

^†Assuming an albedo between 0.04 (typical of extinct comet nuclei) and 0.09.