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
2013-09-05 03:19:20 C 04 15 56.54 +34 46 54.4 – w I72
2013-09-05 03:40:23 C 04 15 59.26 +34 47 09.4 – c A24
2013-09-05 03:40:45 C 04 15 59.44 +34 47 12.4 – c A24
2013-09-05 03:49:15 C 04 16 00.84 +34 47 20.7 – q G40
2013-09-05 03:59:06 C 04 16 02.11 +34 47 26.1 – q G40
2013-09-05 04:09:46 C 04 16 03.60 +34 47 37.1 – w J24
2013-09-05 04:13:09 C 04 16 04.08 +34 47 40.8 – w J24
2013-09-05 04:20:40 C 04 16 05.04 +34 47 46.8 – w J24
2013-09-05 08:11:30 C 04 16 38.21 +34 50 59.1 – v H06
2013-09-05 08:14:06 C 04 16 38.60 +34 51 01.3 – v H06
2013-09-05 09:31:38 C 04 16 49.41 +34 52 07.1 – q H45
2013-09-05 09:33:28 C 04 16 49.66 +34 52 08.5 – q H45
2013-09-05 09:34:48 C 04 16 49.90 +34 52 10.3 – q H45
2013-09-05 09:35:58 C 04 16 50.00 +34 52 10.9 – q H45
2013-09-05 09:37:22 C 04 16 50.20 +34 52 11.8 – q H45
2013-09-05 17:36:29 C 04 17 59.06 +34 58 55.0 – m 372
2013-09-05 18:07:30 C 04 18 03.46 +34 59 21.9 – m 372
2013-09-05 18:41:30 C 04 18 08.29 +34 59 50.6 – m 372
2013-09-06 01:01:58 C 04 19 03.66 +35 05 10.3 – o B51
2013-09-06 01:08:53 C 04 19 04.69 +35 05 16.2 – o B51
2013-09-06 01:15:37 C 04 19 05.65 +35 05 22.2 – o B51
2013-09-06 01:22:20 C 04 19 06.63 +35 05 27.9 – o B51
2013-09-06 01:29:22 C 04 19 07.65 +35 05 33.9 – o B51
2013-09-06 01:37:57 C 04 19 08.86 +35 05 41.2 – o B51
2013-09-06 01:47:21 C 04 19 10.24 +35 05 49.2 – o B51
2013-09-06 01:57:44 C 04 19 11.41 +35 05 56.8 – c B96
2013-09-06 02:11:16 C 04 19 13.71 +35 06 09.2 – c B96
2013-09-06 02:14:40 C 04 19 14.00 +35 06 11.0 – q C23
2013-09-06 02:25:04 C 04 19 15.57 +35 06 20.1 – q C23
2013-09-06 02:33:24 C 04 19 16.75 +35 06 27.0 – q C23
2013-09-06 03:11:28 C 04 19 22.41 +35 06 59.6 – c B96
2013-09-07 00:19:02 C 04 22 30.19 +35 25 00.7 – q C47
2013-09-07 00:26:28 C 04 22 31.32 +35 25 07.6 – q C47
2013-09-07 00:34:26 C 04 22 32.49 +35 25 14.3 – q C47
2013-09-07 00:50:22 C 04 22 34.83 +35 25 28.0 – q C47
2013-09-07 01:00:27 C 04 22 36.35 +35 25 37.1 – q C47
2013-09-07 02:20:34 C 04 22 48.33 +35 26 47.1 – u 235
2013-09-07 02:27:02 C 04 22 49.30 +35 26 52.6 – u 235
2013-09-07 23:53:22 C 04 26 06.23 +35 45 24.1 – t A71
2013-09-07 23:58:35 C 04 26 07.00 +35 45 28.7 – t A71
2013-09-08 03:03:41 C 04 26 35.53 +35 48 12.1 – u K90
2013-09-08 03:04:51 C 04 26 35.69 +35 48 13.1 – u K90
2013-09-08 03:10:48 C 04 26 36.61 +35 48 18.5 – u K90
2013-09-08 03:12:10 C 04 26 36.87 +35 48 19.5 – u K90
2013-09-08 03:12:56 C 04 26 36.92 +35 48 20.3 – u K90
2013-09-08 03:39:32 C 04 26 41.39 +35 48 44.2 – w J24
2013-09-08 03:42:30 C 04 26 41.87 +35 48 47.8 – w J24
2013-09-08 03:44:24 C 04 26 42.18 +35 48 49.4 – w J24
2013-09-08 10:19:32 C 04 27 43.90 +35 54 35.5 – t H47
2013-09-08 10:50:03 C 04 27 48.66 +35 55 01.7 – t H47
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)