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
2016-10-22 23:50:21 C 23 37 06.82 +11 04 31.2 – q I81
2016-10-23 04:47:18 C 23 36 44.12 +11 02 18.2 – q W96
2016-10-23 06:33:33 C 23 36 36.00 +11 01 28.1 – q W96
2016-10-29 19:10:23 C 23 25 17.17 +09 46 01.3 – c B96
2016-10-29 19:12:46 C 23 25 17.01 +09 45 59.8 – c B96
2016-10-29 19:15:10 C 23 25 16.86 +09 45 58.4 – c B96
2016-10-29 19:17:32 C 23 25 16.67 +09 45 57.5 – c B96
2016-10-29 19:19:56 C 23 25 16.50 +09 45 56.3 – c B96
2016-10-29 19:22:20 C 23 25 16.36 +09 45 54.7 – c B96
2016-10-29 19:24:42 C 23 25 16.19 +09 45 54.1 – c B96
2016-10-29 19:40:18 C 23 25 15.18 +09 45 46.9 – q A77
2016-10-29 20:39:16 C 23 25 11.06 +09 45 19.5 – Q 213
2016-10-29 20:52:33 C 23 25 10.12 +09 45 14.1 – Q 213
2016-10-29 20:55:50 C 23 25 09.92 +09 45 11.1 – q 160
2016-10-29 20:59:10 C 23 25 09.68 +09 45 09.3 – q 160
2016-10-29 21:02:17 C 23 25 09.51 +09 45 07.9 – u 107
2016-10-29 21:02:31 C 23 25 09.43 +09 45 07.4 – q 160
2016-10-29 21:11:07 C 23 25 08.85 +09 45 03.9 – Q 213
2016-10-29 21:23:11 C 23 25 08.04 +09 44 58.0 – q A77
2016-10-29 21:39:49 C 23 25 06.85 +09 44 49.6 – q A77
2016-10-29 22:01:27 C 23 25 05.37 +09 44 39.1 – u 107
2016-10-29 22:48:40 C 23 25 02.21 +09 44 18.4 – q J22
2016-10-29 22:57:25 C 23 25 01.62 +09 44 14.2 – q J22
2016-10-29 23:00:37 C 23 25 01.30 +09 44 10.8 – u 107
2016-10-29 23:06:07 C 23 25 01.01 +09 44 10.1 – q J22
2016-10-30 02:12:15 C 23 24 48.56 +09 42 41.0 – q H47
2016-10-30 02:23:08 C 23 24 47.83 +09 42 35.1 – q H47
2016-10-30 02:31:57 C 23 24 47.16 +09 42 31.7 – q H47
2016-10-30 18:02:22 C 23 23 44.80 +09 35 05.8 – q K22
2016-10-30 18:47:33 C 23 23 41.70 +09 34 44.5 – q K22
2016-10-30 19:32:18 C 23 23 38.57 +09 34 22.8 – q A71
2016-10-30 19:33:33 C 23 23 38.60 +09 34 22.8 – q Z78
2016-10-30 19:36:41 C 23 23 38.40 +09 34 21.8 – q Z78
2016-10-30 19:39:48 C 23 23 38.17 +09 34 20.4 – q Z78
2016-10-30 19:50:33 C 23 23 37.35 +09 34 14.3 – q A71
2016-10-30 20:11:20 C 23 23 36.05 +09 34 04.6 – Q A02
2016-10-30 21:03:40 C 23 23 32.45 +09 33 39.1 – Q A02
2016-10-30 21:11:45 C 23 23 31.85 +09 33 34.7 – Q A02
2016-10-30 21:13:04 C 23 23 31.76 +09 33 35.4 – q 160
2016-10-30 21:16:26 C 23 23 31.53 +09 33 33.7 – q 160
2016-10-30 21:19:48 C 23 23 31.31 +09 33 32.0 – q 160
2016-10-31 03:04:10 C 23 23 08.51 +09 30 49.7 – q H47
2016-10-31 03:20:27 C 23 23 07.43 +09 30 42.0 – q H47
2016-10-31 03:36:14 C 23 23 06.35 +09 30 33.4 – q H47
2016-10-31 18:28:42 C 23 22 07.83 +09 23 29.1 – q A71
2016-10-31 18:43:12 C 23 22 06.85 +09 23 22.3 – q A71
2016-10-31 18:54:38 C 23 22 06.09 +09 23 16.8 – q A71
2016-10-31 19:06:04 C 23 22 05.33 +09 23 11.5 – q A71
2016-10-31 20:24:50 C 23 22 00.16 +09 22 34.2 – U 958
2016-10-31 20:40:01 C 23 21 59.14 +09 22 26.8 – U 958
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)