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
2019-10-04 14:48:15 C 23 25 58.79 +04 03 57.3 – q Q11
2019-10-04 14:58:33 C 23 25 58.25 +04 03 54.3 – q Q11
2019-10-05 07:13:28 C 23 25 08.729 +03 58 59.98 – U F52
2019-10-05 07:29:18 C 23 25 07.902 +03 58 55.09 – U F52
2019-10-05 07:45:06 C 23 25 07.086 +03 58 50.28 – U F52
2019-10-05 08:00:56 C 23 25 06.254 +03 58 45.63 – U F52
2019-10-06 04:05:28 C 23 24 05.24 +03 52 40.1 – U I41
2019-10-06 04:46:07 C 23 24 03.15 +03 52 27.7 – U I41
2019-10-07 04:07:22 C 23 22 52.68 +03 45 23.6 – U I41
2019-10-07 04:48:13 C 23 22 50.60 +03 45 11.3 – U I41
2019-10-08 00:49:31 C 23 21 50.46 +03 39 07.8 – v A77
2019-10-08 00:58:15 C 23 21 49.98 +03 39 05.1 – v A77
2019-10-08 01:06:59 C 23 21 49.56 +03 39 02.2 – v A77
2019-10-08 21:10:03 C 23 20 50.33 +03 32 59.9 – q L27
2019-10-08 21:17:51 C 23 20 49.94 +03 32 57.0 – q L27
2019-10-08 21:25:39 C 23 20 49.55 +03 32 54.2 – q L27
2019-10-16 07:54:37 C 23 12 26.839 +02 40 03.49 – U F52
2019-10-16 08:09:34 C 23 12 26.160 +02 39 59.13 – U F52
2019-10-16 08:24:30 C 23 12 25.486 +02 39 54.89 – U F52
2019-10-16 08:39:29 C 23 12 24.801 +02 39 50.52 – U F52
2019-10-16 19:07:08 C 23 11 57.14 +02 36 48.3 – v A77
2019-10-16 19:15:52 C 23 11 56.74 +02 36 46.0 – v A77
2019-10-16 19:24:36 C 23 11 56.41 +02 36 43.9 – v A77
2019-10-20 02:26:36 C 23 08 34.14 +02 14 23.8 – V G96
2019-10-20 02:34:36 C 23 08 33.80 +02 14 21.6 – V G96
2019-10-20 02:42:35 C 23 08 33.46 +02 14 19.4 – V G96
2019-10-20 02:50:35 C 23 08 33.13 +02 14 17.2 – V G96
2019-10-25 07:33:41 C 23 03 41.766 +01 40 55.86 – U F52
2019-10-25 07:51:27 C 23 03 41.095 +01 40 51.25 – U F52
2019-10-25 08:09:06 C 23 03 40.431 +01 40 46.74 – U F52
2019-10-25 08:26:41 C 23 03 39.768 +01 40 42.31 – U F52
2019-10-25 13:29:30 C 23 03 28.70 +01 39 23.9 – q Q11
2019-10-25 13:34:38 C 23 03 28.53 +01 39 23.0 – q Q11
2019-10-25 13:39:46 C 23 03 28.33 +01 39 21.3 – q Q11
2019-10-26 19:10:16 C 23 02 25.50 +01 31 53.2 – q L27
2019-10-26 19:36:56 C 23 02 24.45 +01 31 48.5 – q L27
2019-10-26 20:03:36 C 23 02 23.57 +01 31 40.4 – q L27
2019-10-27 03:52:08 C 23 02 07.31 +01 29 43.3 – V G96
2019-10-27 04:00:12 C 23 02 07.00 +01 29 41.4 – V G96
2019-10-27 04:08:17 C 23 02 06.71 +01 29 39.4 – V G96
2019-10-27 04:16:20 C 23 02 06.42 +01 29 37.4 – V G96
2019-10-27 06:20:02 C 23 02 02.208 +01 29 07.42 – U F52
2019-10-27 06:37:44 C 23 02 01.584 +01 29 03.01 – U F52
2019-10-27 06:55:25 C 23 02 00.951 +01 28 58.70 – U F52
2019-10-27 07:13:11 C 23 02 00.318 +01 28 54.27 – U F52
2019-10-31 09:31:18 C 22 58 49.57 +01 05 33.0 – q Q11
2019-10-31 09:39:31 C 22 58 49.34 +01 05 31.0 – q Q11
2019-10-31 09:48:14 C 22 58 49.06 +01 05 28.9 – q Q11
2019-11-04 10:13:47 C 22 56 06.92 +00 44 41.2 – q Q11
2019-11-04 10:26:37 C 22 56 06.59 +00 44 38.6 – q Q11
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)