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
2012-08-10 06:33:55 C 23 41 21.69 +01 35 15.9 – V G45
2012-08-10 07:16:09 C 23 41 20.45 +01 35 10.3 – V G45
2012-08-10 09:49:54 C 23 41 15.89 +01 34 50.8 – V G45
2012-08-13 20:37:20 C 23 38 45.69 +01 23 51.9 – v 188
2012-08-13 20:39:22 C 23 38 45.62 +01 23 51.5 – v 188
2012-08-13 20:41:24 C 23 38 45.56 +01 23 51.2 – v 188
2012-08-13 20:43:27 C 23 38 45.49 +01 23 51.0 – v 188
2012-08-13 20:45:29 C 23 38 45.42 +01 23 50.7 – v 188
2012-08-22 13:42:04 c 23 31 37.177 +00 50 24.43 – L F51
2012-08-22 13:44:14 c 23 31 37.094 +00 50 24.02 – L F51
2012-08-22 13:46:23 c 23 31 37.015 +00 50 23.62 – L F51
2012-08-22 13:54:57 c 23 31 36.694 +00 50 22.12 – L F51
2012-08-22 13:57:05 c 23 31 36.614 +00 50 21.75 – L F51
2012-08-22 14:00:02 c 23 31 36.499 +00 50 21.21 – L F51
2012-08-22 14:02:11 c 23 31 36.420 +00 50 20.80 – L F51
2012-08-22 14:04:20 c 23 31 36.343 +00 50 20.34 – L F51
2012-08-22 14:06:28 c 23 31 36.256 +00 50 20.31 – L F51
2012-08-22 14:08:36 c 23 31 36.184 +00 50 19.66 – L F51
2012-08-22 14:10:45 c 23 31 36.104 +00 50 19.27 – L F51
2012-08-22 14:15:02 c 23 31 35.945 +00 50 18.48 – L F51
2012-08-24 13:58:11 c 23 29 49.434 +00 41 36.21 – L F51
2012-08-24 14:02:26 c 23 29 49.273 +00 41 35.39 – L F51
2012-08-24 14:06:42 c 23 29 49.098 +00 41 34.61 – L F51
2012-08-24 14:10:57 c 23 29 48.945 +00 41 33.83 – L F51
2012-08-24 14:23:49 c 23 29 48.454 +00 41 31.44 – L F51
2012-08-24 14:28:07 c 23 29 48.283 +00 41 30.65 – L F51
2012-08-25 09:29:22 c 23 29 05.262 +00 37 56.50 – L F51
2012-08-25 09:33:40 c 23 29 05.097 +00 37 55.73 – L F51
2012-08-25 09:35:49 c 23 29 05.017 +00 37 55.29 – L F51
2012-08-25 09:40:06 c 23 29 04.847 +00 37 54.45 – L F51
2012-08-25 09:42:14 c 23 29 04.759 +00 37 54.04 – L F51
2012-08-25 09:44:23 c 23 29 04.679 +00 37 53.62 – L F51
2012-08-25 23:09:09 C 23 28 33.85 +00 35 19.4 – r 106
2012-08-25 23:25:23 C 23 28 33.22 +00 35 16.4 – r 106
2012-08-26 01:06:52 C 23 28 29.39 +00 34 57.9 – u J43
2012-08-26 01:34:54 C 23 28 28.29 +00 34 52.2 – u J43
2012-08-26 02:02:50 C 23 28 27.23 +00 34 47.4 – u J43
2012-08-26 02:30:52 C 23 28 26.04 +00 34 41.9 – u J43
2012-08-26 09:57:58 c 23 28 08.969 +00 33 15.84 – L F51
2012-08-26 10:02:12 c 23 28 08.813 +00 33 15.02 – L F51
2012-08-26 10:15:02 c 23 28 08.306 +00 33 12.48 – L F51
2012-08-26 10:23:33 c 23 28 07.966 +00 33 10.90 – L F51
2012-08-26 10:27:48 c 23 28 07.801 +00 33 10.08 – L F51
2012-08-26 12:42:54 c 23 28 02.478 +00 32 44.05 – L F51
2012-08-26 13:03:04 c 23 28 01.686 +00 32 40.13 – L F51
2012-08-26 13:23:16 c 23 28 00.895 +00 32 36.21 – L F51
2012-08-26 13:43:30 c 23 28 00.094 +00 32 32.30 – L F51
2012-08-27 10:39:22 c 23 27 11.470 +00 28 27.46 – L F51
2012-08-27 10:43:37 c 23 27 11.315 +00 28 26.62 – L F51
2012-08-27 10:47:52 c 23 27 11.140 +00 28 25.75 – L F51
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)