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
2013-10-05 02:50:19 C 07 37 32.16 +43 26 48.7 – q G40
2013-10-05 02:58:41 C 07 37 36.28 +43 26 46.3 – q G40
2013-10-05 02:59:53 C 07 37 37.05 +43 26 45.9 – q G40
2013-10-06 00:05:11 C 07 48 26.60 +43 16 51.1 – q 987
2013-10-06 00:08:02 C 07 48 28.04 +43 16 50.2 – q 987
2013-10-06 00:10:33 C 07 48 29.26 +43 16 49.2 – q 987
2013-10-06 00:54:50 C 07 48 52.53 +43 16 29.4 – u C36
2013-10-06 00:55:55 C 07 48 53.18 +43 16 29.1 – u C36
2013-10-06 01:02:28 C 07 48 56.53 +43 16 25.1 – u C36
2013-10-06 01:03:32 C 07 48 56.96 +43 16 25.7 – u C36
2013-10-06 01:04:37 C 07 48 57.58 +43 16 24.3 – u C36
2013-10-06 01:45:46 C 07 49 19.03 +43 15 58.3 – w J38
2013-10-06 01:46:20 C 07 49 19.20 +43 15 58.9 – w J38
2013-10-06 01:48:00 C 07 49 20.14 +43 15 57.7 – w J38
2013-10-06 03:13:52 C 07 50 05.36 +43 15 14.5 – v A77
2013-10-06 03:38:47 C 07 50 18.24 +43 15 00.6 – v A77
2013-10-06 03:52:31 C 07 50 25.37 +43 14 52.7 – v A77
2013-10-07 02:11:29 C 08 02 14.75 +42 58 55.9 – u 958
2013-10-07 02:28:29 C 08 02 23.90 +42 58 43.0 – u 958
2013-10-07 02:45:29 C 08 02 33.00 +42 58 29.4 – u 958
2013-10-07 04:24:35 C 08 03 25.48 +42 57 09.4 – u B74
2013-10-07 04:26:19 C 08 03 26.80 +42 57 07.4 – w Z74
2013-10-07 04:26:34 C 08 03 26.55 +42 57 08.0 – u B74
2013-10-07 04:28:24 C 08 03 28.87 +42 57 04.1 – w Z74
2013-10-07 04:29:10 C 08 03 27.90 +42 57 05.9 – u B74
2013-10-07 04:29:27 C 08 03 28.27 +42 57 05.5 – w Z74
2013-10-07 04:29:58 C 08 03 28.97 +42 57 05.0 – w Z74
2013-10-07 04:30:29 C 08 03 29.20 +42 57 05.8 – w Z74
2013-10-07 04:30:59 C 08 03 29.65 +42 57 03.6 – w Z74
2013-10-07 04:31:31 C 08 03 29.45 +42 57 02.8 – w Z74
2013-10-07 04:33:05 C 08 03 30.95 +42 57 04.9 – w Z74
2013-10-07 04:33:36 C 08 03 31.11 +42 57 01.4 – w Z74
2013-10-07 04:34:09 C 08 03 31.11 +42 57 00.9 – w Z74
2013-10-07 04:34:40 C 08 03 30.83 +42 57 01.8 – w Z74
2013-10-07 04:35:11 C 08 03 31.88 +42 57 01.7 – w Z74
2013-10-07 04:35:43 C 08 03 31.93 +42 57 00.8 – w Z74
2013-10-07 11:12:29 C 08 07 05.43 +42 51 13.4 – t H47
2013-10-07 11:19:27 C 08 07 09.15 +42 51 05.4 – t H47
2013-10-07 23:25:16 C 08 13 44.66 +42 38 53.9 – w I81
2013-10-07 23:26:50 C 08 13 45.53 +42 38 52.5 – w I81
2013-10-08 01:33:40 C 08 14 54.91 +42 36 43.4 – w A02
2013-10-08 01:42:05 C 08 14 59.34 +42 36 33.8 – w A02
2013-10-08 04:24:02 C 08 16 27.71 +42 33 43.3 – – 442
2013-10-08 04:28:53 C 08 16 30.77 +42 33 36.7 – – 442
2013-10-08 11:09:00 C 08 20 10.62 +42 26 00.3 – t H47
2013-10-08 11:12:27 C 08 20 12.54 +42 25 56.9 – t H47
2013-10-08 11:15:55 C 08 20 14.34 +42 25 52.5 – t H47
2013-10-09 01:50:35 C 08 28 20.17 +42 07 06.4 – w I81
2013-10-09 01:57:10 C 08 28 24.03 +42 06 57.0 – w I81
2013-10-09 02:04:18 C 08 28 27.92 +42 06 47.5 – w I81
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)