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
2016-10-03 21:11:41 C 00 14 00.36 +14 18 53.7 – q 160
2016-10-03 21:23:44 C 00 13 59.39 +14 18 49.0 – q C10
2016-10-03 21:57:10 C 00 13 56.69 +14 18 37.7 – q C10
2016-10-03 22:26:57 C 00 13 54.31 +14 18 27.5 – q 958
2016-10-03 22:33:13 C 00 13 53.79 +14 18 25.7 – q C10
2016-10-03 22:42:54 C 00 13 53.00 +14 18 22.4 – q 958
2016-10-03 22:58:48 C 00 13 51.68 +14 18 17.1 – q 958
2016-10-04 20:01:33 C 00 12 10.94 +14 10 59.8 – q A71
2016-10-04 20:27:27 C 00 12 08.85 +14 10 51.0 – q A71
2016-10-04 20:53:45 C 00 12 06.70 +14 10 41.6 – q A71
2016-10-04 21:02:54 C 00 12 05.87 +14 10 38.7 – q A77
2016-10-04 21:20:27 C 00 12 04.50 +14 10 31.7 – q B96
2016-10-04 21:22:51 C 00 12 04.29 +14 10 30.6 – q B96
2016-10-04 21:25:14 C 00 12 04.09 +14 10 29.9 – q B96
2016-10-04 21:27:38 C 00 12 03.89 +14 10 29.1 – q B96
2016-10-04 21:33:40 C 00 12 03.55 +14 10 28.2 – w J01
2016-10-04 21:50:04 C 00 12 02.23 +14 10 22.5 – w J01
2016-10-04 21:58:16 C 00 12 01.55 +14 10 19.6 – w J01
2016-10-04 22:15:39 C 00 11 59.94 +14 10 12.9 – q A77
2016-10-04 23:18:22 C 00 11 54.99 +14 09 51.0 – q C23
2016-10-04 23:33:15 C 00 11 53.63 +14 09 45.7 – q A77
2016-10-04 23:35:00 C 00 11 53.61 +14 09 45.2 – q C23
2016-10-05 00:04:07 C 00 11 51.24 +14 09 34.6 – q C23
2016-10-05 05:22:33 C 00 11 25.83 +14 07 43.8 – V G45
2016-10-05 05:26:47 C 00 11 25.48 +14 07 42.2 – V G45
2016-10-05 06:22:21 C 00 11 20.93 +14 07 22.5 – V G45
2016-10-05 07:12:46 C 00 11 16.81 +14 07 04.4 – V G45
2016-10-05 07:16:26 C 00 11 16.51 +14 07 03.3 – V G45
2016-10-05 08:09:57 C 00 11 12.14 +14 06 44.0 – V G45
2016-10-05 09:56:06 C 00 11 03.46 +14 06 05.9 – V G45
2016-10-05 10:54:52 C 00 10 58.69 +14 05 44.6 – V G45
2016-10-05 20:24:43 C 00 10 13.18 +14 02 18.6 – Q B96
2016-10-05 20:27:05 C 00 10 12.97 +14 02 17.7 – Q B96
2016-10-05 20:29:30 C 00 10 12.79 +14 02 16.4 – Q B96
2016-10-05 20:31:52 C 00 10 12.58 +14 02 16.1 – Q B96
2016-10-05 20:34:16 C 00 10 12.41 +14 02 14.9 – Q B96
2016-10-05 20:36:38 C 00 10 12.21 +14 02 14.0 – Q B96
2016-10-05 21:19:00 C 00 10 08.85 +14 01 59.0 – q J69
2016-10-05 21:21:21 C 00 10 08.65 +14 01 58.8 – q A77
2016-10-05 21:31:52 C 00 10 07.83 +14 01 55.2 – q A77
2016-10-05 21:33:15 C 00 10 07.69 +14 01 53.9 – q J69
2016-10-05 21:45:12 C 00 10 06.71 +14 01 51.0 – q A77
2016-10-05 21:47:29 C 00 10 06.53 +14 01 48.8 – q J69
2016-10-05 21:59:01 C 00 10 05.60 +14 01 45.4 – q A77
2016-10-06 10:54:32 C 00 09 02.689 +13 57 04.79 – L F51
2016-10-06 11:13:18 C 00 09 01.137 +13 56 57.83 – L F51
2016-10-06 11:31:58 C 00 08 59.601 +13 56 50.90 – L F51
2016-10-06 11:50:44 C 00 08 58.050 +13 56 43.94 – L F51
2016-10-06 14:41:22 C 00 08 44.33 +13 55 46.6 – q Q68
2016-10-06 15:11:23 C 00 08 41.85 +13 55 35.3 – q Q68
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)