| Discovery | |
|---|---|
| Discovered by | LONEOS |
| Discovery date | 6 March 2003 |
| Designations | |
| MPC designation | (196256) 2003 EH1 |
| Minor planet category | NEO · Amor extinct comet |
| Orbital characteristics | |
| 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° 10 42.984 / 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 |
| Sidereal rotation period | 12.650±0.033 h |
| Absolute magnitude (H) | 16.2 |
(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. Peter Jenniskens (2003–2004) proposed that it is the parent body of the Quadrantid meteor shower. 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.
Notes
Assuming an albedo between 0.04 (typical of extinct comet nuclei) and 0.09.
References
- ^ "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.
- ^ "IAUC 8252: 2003kw; 2003 EH_1, THE QUADRANTIDS". IAU Central Bureau for Astronomical Telegrams. 8 December 2003. Retrieved 14 October 2015.
- 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.
- Ball, Philip (2003). "Dead comet spawned New Year meteors". Nature News. doi:10.1038/news031229-5.
- 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.
- 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.
External links
- Quadrantid Parent Discovered (Leonid Daily News: 8 December 2003)
- (196256) 2003 EH1 at NeoDyS-2, Near Earth Objects—Dynamic Site
- (196256) 2003 EH1 at ESA–space situational awareness
- (196256) 2003 EH1 at the JPL Small-Body Database
| Minor planets navigator | |
|---|---|
| Small Solar System bodies | |||||||
|---|---|---|---|---|---|---|---|
| Minor planets |
| ||||||
| Comets | |||||||
| Other | |||||||