Encke (2P)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2022-10-03 (JD 2459855.5)
Eccentricity (e)0.8477003353 ± 2.19e-07
Semi-major axis (a)2.2196888070 AU ± 1.36e-07
Inclination (i)11.40704099° ± 2.08e-05
Long. of Asc. Node (Ω)334.18510998° ± 5.54e-05
Arg. of Perihelion (ω)187.14215822° ± 5.56e-05
Mean Anomaly (M)245.50091097° ± 1.14e-05
Mean Motion (n)0.2980340852°/day ± 2.73e-08
Perihelion dist (q)0.33805786 AU ± 4.86e-07
Aphelion dist (Q)4.10131975 AU ± 5.46e-07
Orbital Period3.30709248 yr ± 3.03e-07
Physical Parameters
Diameter4.800 km
Geometric Albedo0.046
Rotation Period11.083 h
Orbit Solution
SourceJPL
Solution Date2026-08-13 12:41:21
RMS Residual0.448″
Uncertainty1
Orbit TypeEncke-type Comet
MOID0.166917 AU
Observations Used645
Oppositions—
Arc Total2018-2026
First Observation Used—
Last Observation Used2026-08-11
Observations (6393)
Date Type RA Dec Mag Band Observatory
2000-09-14 00:42:05 s 2 -0.0098155 1 -0.0027378 5196.0 – 249
2000-09-14 01:42:05 S 11 42 22.5 -00 02 58 – – 249
2000-09-14 01:42:05 s 2 -0.0098153 0 -0.0027437 5584.0 – 249
2000-09-14 02:18:05 S 11 42 34.3 -00 04 32 – – 249
2000-09-14 02:18:05 s 2 -0.0098151 8 -0.0027473 5817.0 – 249
2000-09-14 02:42:06 S 11 42 40.8 -00 06 03 – – 249
2000-09-14 02:42:06 s 2 -0.0098150 9 -0.0027497 5973.0 – 249
2000-09-14 03:18:06 S 11 42 54.8 -00 07 48 – – 249
2000-09-14 03:18:06 s 2 -0.0098149 7 -0.0027533 6205.0 – 249
2000-09-14 03:42:05 S 11 43 02.7 -00 09 01 – – 249
2000-09-14 03:42:05 s 2 -0.0098148 8 -0.0027556 6360.0 – 249
2000-09-14 04:18:07 S 11 43 14.6 -00 11 03 – – 249
2000-09-14 04:18:07 s 2 -0.0098147 5 -0.0027592 6593.0 – 249
2000-09-14 04:42:06 S 11 43 22.8 -00 12 00 – – 249
2000-09-14 04:42:06 s 2 -0.0098146 6 -0.0027616 6748.0 – 249
2000-09-14 05:18:05 S 11 43 36.2 -00 14 06 – – 249
2000-09-14 05:18:05 s 2 -0.0098145 3 -0.0027651 6980.0 – 249
2000-09-14 05:42:05 S 11 43 42.1 -00 15 06 – – 249
2000-09-14 05:42:05 s 2 -0.0098144 5 -0.0027675 7135.0 – 249
2000-09-14 06:18:05 S 11 43 55.9 -00 16 56 – – 249
2000-09-14 06:18:05 s 2 -0.0098143 2 -0.0027711 7367.0 – 249
2000-09-14 06:42:05 S 11 44 04.5 -00 18 09 – – 249
2000-09-14 06:42:05 s 2 -0.0098142 3 -0.0027734 7522.0 – 249
2000-09-14 08:18:05 S 11 44 35.0 -00 22 58 – – 249
2000-09-14 08:18:05 s 2 -0.0098138 7 -0.0027829 8140.0 – 249
2000-09-14 09:18:06 S 11 44 56.1 -00 25 48 – – 249
2000-09-14 09:18:06 s 2 -0.0098136 4 -0.0027888 8526.0 – 249
2000-09-14 09:42:05 S 11 45 04.2 -00 27 15 – – 249
2000-09-14 09:42:05 s 2 -0.0098135 5 -0.0027912 8681.0 – 249
2000-09-14 10:18:08 S 11 45 15.1 -00 28 47 – – 249
2000-09-14 10:18:08 s 2 -0.0098134 2 -0.0027947 8912.0 – 249
2000-09-14 10:42:06 S 11 45 25.1 -00 30 05 – – 249
2000-09-14 10:42:06 s 2 -0.0098133 2 -0.0027970 9066.0 – 249
2000-09-14 11:18:05 S 11 45 36.3 -00 31 57 – – 249
2000-09-14 11:18:05 s 2 -0.0098131 9 -0.0028006 9297.0 – 249
2000-09-14 11:42:05 S 11 45 45.1 -00 33 16 – – 249
2000-09-14 11:42:05 s 2 -0.0098130 9 -0.0028029 9451.0 – 249
2000-09-14 12:18:05 S 11 45 56.4 -00 35 00 – – 249
2000-09-14 12:18:05 s 2 -0.0098129 5 -0.0028065 9682.0 – 249
2000-09-14 12:42:05 S 11 46 04.6 -00 36 28 – – 249
2000-09-14 12:42:05 s 2 -0.0098128 6 -0.0028088 9836.0 – 249
2000-09-14 13:42:05 S 11 46 25.5 -00 39 12 – – 249
2000-09-14 13:42:05 s 2 -0.0098126 2 -0.0028147 220.0 – 249
2000-09-14 14:18:05 S 11 46 37.0 -00 41 03 – – 249
2000-09-14 14:18:05 s 2 -0.0098124 8 -0.0028182 451.0 – 249
2000-09-14 14:42:06 S 11 46 45.2 -00 42 17 – – 249
2000-09-14 14:42:06 s 2 -0.0098123 9 -0.0028205 604.0 – 249
2000-09-14 15:18:05 S 11 46 57.3 -00 44 05 – – 249
2000-09-14 15:18:05 s 2 -0.0098122 4 -0.0028241 835.0 – 249
2000-09-14 15:42:05 S 11 47 05.9 -00 45 21 – – 249
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1980-11-05 14:44:00 -280334.5 2.5 Hz 2380 -1 -1
1980-11-05.613889 -2803345 10 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)