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
2013-09-16 02:54:00 C 05 01 25.90 +38 43 13.2 – q 511
2013-09-16 03:03:30 C 05 01 27.94 +38 43 21.8 – q 511
2013-09-16 03:08:23 C 05 01 28.91 +38 43 26.1 – w I72
2013-09-16 03:16:37 C 05 01 30.97 +38 43 35.7 – w I72
2013-09-16 03:20:45 C 05 01 31.46 +38 43 38.0 – w I72
2013-09-16 07:35:13 C 05 02 26.11 +38 47 38.5 – q 850
2013-09-16 08:14:13 C 05 02 34.39 +38 48 15.7 – q 850
2013-09-16 08:20:43 C 05 02 35.82 +38 48 21.7 – q 850
2013-09-16 08:40:14 C 05 02 39.93 +38 48 40.2 – q 850
2013-09-16 08:53:14 C 05 02 42.61 +38 48 53.1 – q 850
2013-09-16 08:59:45 C 05 02 44.02 +38 48 59.5 – q 850
2013-09-16 17:58:30 C 05 04 40.65 +38 57 27.7 – m 372
2013-09-16 18:10:29 C 05 04 43.23 +38 57 39.2 – m 372
2013-09-16 18:26:29 C 05 04 46.72 +38 57 55.0 – m 372
2013-09-16 19:51:42 C 05 05 05.09 +38 59 14.7 – u 367
2013-09-16 19:54:02 C 05 05 05.59 +38 59 17.3 – u 367
2013-09-16 19:56:22 C 05 05 06.08 +38 59 19.6 – u 367
2013-09-17 02:19:53 C 05 06 30.71 +39 05 17.2 – q C23
2013-09-17 02:32:12 C 05 06 33.51 +39 05 28.7 – q C23
2013-09-17 02:44:31 C 05 06 36.17 +39 05 40.4 – q C23
2013-09-17 03:23:25 C 05 06 45.14 +39 06 20.1 – w I72
2013-09-17 03:27:33 C 05 06 45.55 +39 06 22.0 – w I72
2013-09-17 03:31:41 C 05 06 46.92 +39 06 28.1 – w I72
2013-09-17 18:35:59 C 05 10 10.22 +39 20 42.6 – m 372
2013-09-17 18:45:00 C 05 10 12.32 +39 20 51.3 – m 372
2013-09-17 18:54:00 C 05 10 14.29 +39 20 59.7 – m 372
2013-09-18 03:23:13 C 05 12 11.91 +39 28 59.1 – w I72
2013-09-18 03:31:33 C 05 12 13.29 +39 29 04.5 – w I72
2013-09-18 03:38:56 C 05 12 15.12 +39 29 12.1 – c A24
2013-09-18 03:39:17 C 05 12 15.23 +39 29 12.5 – c A24
2013-09-18 03:39:52 C 05 12 15.29 +39 29 12.8 – w I72
2013-09-18 17:17:59 C 05 15 28.09 +39 42 05.1 – m 349
2013-09-18 17:31:10 C 05 15 31.14 +39 42 17.2 – m 349
2013-09-18 18:15:52 C 05 15 41.76 +39 43 00.3 – q 900
2013-09-18 18:26:10 C 05 15 44.16 +39 43 10.3 – q 900
2013-09-19 01:15:00 C 05 17 23.08 +39 49 32.6 – c J08
2013-09-19 02:26:31 C 05 17 40.21 +39 50 40.3 – c J08
2013-09-20 03:15:48 C 05 23 49.43 +40 13 53.9 – w I72
2013-09-20 03:19:58 C 05 23 50.38 +40 13 57.6 – w I72
2013-09-20 03:24:07 C 05 23 51.94 +40 14 02.9 – w I72
2013-09-21 00:41:36 C 05 29 23.98 +40 33 42.2 – w A02
2013-09-21 00:49:23 C 05 29 26.00 +40 33 50.0 – w A02
2013-09-21 00:55:35 C 05 29 27.68 +40 33 55.4 – w A02
2013-09-21 02:11:39 C 05 29 47.59 +40 35 07.7 – q 160
2013-09-21 02:15:37 C 05 29 48.64 +40 35 11.3 – q 160
2013-09-21 02:19:34 C 05 29 49.67 +40 35 14.8 – q 160
2013-09-22 01:55:16 C 05 36 15.63 +40 56 43.5 – q C10
2013-09-22 02:10:25 C 05 36 19.81 +40 56 57.3 – q C10
2013-09-22 02:47:19 C 05 36 30.05 +40 57 32.2 – q C10
2013-09-22 02:59:04 C 05 36 33.30 +40 57 42.3 – q C10
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)