(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 byLONEOS
Discovery date6 March 2003
Designations
(196256) 2003 EH1
NEO · Amor[1]
extinct comet
Orbital characteristics[1]
Epoch 13 January 2016 (JD 2457400.5)
Uncertainty parameter 0
Observation arc4035 days (11.05 yr)
Aphelion5.055446 AU (756.2840 Gm) (Q)
Perihelion1.190060 AU (178.0304 Gm) (q)
3.12275 AU (467.157 Gm) (a)
Eccentricity0.618907 (e)
5.52 yr (2015.6 d)
119.8736° (M)
0° 10m 42.984s / day (n)
Inclination70.865968° (i)
282.972499° (Ω)
171.3709° (ω)
Earth MOID0.21143 AU (31.629 Gm)
Jupiter MOID0.231939 AU (34.6976 Gm)
TJupiter2.065
Physical characteristics
Dimensions2.6–4.0 km†
12.650±0.033 h[3]
16.2[1]

    Notes

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

    References
    1. "JPL Small-Body Database Browser: 196256 (2003 EH1)" (2014-03-23 last obs and observation arc=11.05 years). Jet Propulsion Laboratory. Retrieved 7 April 2016.
    2. "IAUC 8252: 2003kw; 2003 EH_1, THE QUADRANTIDS". IAU Central Bureau for Astronomical Telegrams. 8 December 2003. Retrieved 14 October 2015.
    3. Kasuga, Toshihiro; Jewitt, David (2015). "Physical Observations of (196256) 2003 EH1, Presumed Parent of the Quadrantid Meteoroid Stream". The Astronomical Journal. 150 (5). 152. arXiv:1509.03361. Bibcode:2015AJ....150..152K. doi:10.1088/0004-6256/150/5/152. S2CID 50649.
    4. Ball, Philip (2003). "Dead comet spawned New Year meteors". Nature News. doi:10.1038/news031229-5.
    5. Jenniskens, Peter (2004). "2003 EH1 Is the Quadrantid Shower Parent Comet". The Astronomical Journal. 127 (5): 3018–3022. Bibcode:2004AJ....127.3018J. doi:10.1086/383213.
    6. Porubčan, V.; Kornoš, L. (2005). "The Quadrantid meteor stream and 2003 EH1". Contributions of the Astronomical Observatory Skalnaté Pleso. 35 (1): 5–16. Bibcode:2005CoSka..35....5P.
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