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
2013-10-22 04:36:46 C 11 13 20.75 +25 48 22.3 – q A77
2013-10-22 12:03:42 C 11 16 31.30 +25 16 18.2 – q H06
2013-10-22 12:04:52 C 11 16 31.82 +25 16 12.7 – q H06
2013-10-22 12:06:02 C 11 16 32.38 +25 16 07.5 – q H06
2013-10-22 12:07:12 C 11 16 32.81 +25 16 02.6 – q H06
2013-10-22 12:08:22 C 11 16 33.34 +25 15 57.3 – q H06
2013-10-24 02:37:38 C 11 32 16.49 +22 28 40.6 – q C23
2013-10-24 02:45:56 C 11 32 19.74 +22 28 05.6 – q C23
2013-10-24 02:56:20 C 11 32 23.98 +22 27 19.4 – q C23
2013-10-24 04:50:14 C 11 33 08.79 +22 19 08.4 – – 442
2013-10-24 04:52:25 C 11 33 09.63 +22 18 57.2 – – 442
2013-10-24 12:41:45 C 11 36 12.39 +21 44 54.6 – q G68
2013-10-24 12:51:45 C 11 36 16.24 +21 44 12.9 – q G68
2013-10-24 13:01:45 C 11 36 20.04 +21 43 28.0 – q G68
2013-10-26 03:43:49 C 11 50 44.54 +18 55 40.0 – q K90
2013-10-26 03:45:33 C 11 50 45.14 +18 55 32.8 – q K90
2013-10-26 03:46:02 C 11 50 45.30 +18 55 30.4 – q K90
2013-10-26 03:47:23 C 11 50 45.59 +18 55 23.8 – q K90
2013-10-26 04:27:13 C 11 50 59.87 +18 52 33.6 – w C35
2013-10-26 04:27:38 C 11 51 00.04 +18 52 30.6 – w C35
2013-10-26 04:28:45 C 11 51 00.41 +18 52 27.1 – o B51
2013-10-26 04:28:54 C 11 51 00.70 +18 52 25.5 – q A77
2013-10-26 04:28:56 C 11 51 00.62 +18 52 26.0 – w C35
2013-10-26 04:30:00 C 11 51 01.00 +18 52 21.0 – o B51
2013-10-26 04:30:48 C 11 51 01.40 +18 52 19.2 – q A77
2013-10-26 04:32:41 C 11 51 02.24 +18 52 08.1 – q A77
2013-10-26 19:36:20 C 11 56 21.05 +17 47 32.4 – u 367
2013-10-26 19:38:04 C 11 56 21.62 +17 47 25.0 – u 367
2013-10-26 19:39:50 C 11 56 22.28 +17 47 17.4 – u 367
2013-10-27 03:03:03 C 11 58 55.16 +17 15 42.4 – q C23
2013-10-27 03:07:47 C 11 58 56.76 +17 15 22.8 – q C23
2013-10-27 03:14:06 C 11 58 58.95 +17 14 54.9 – q C23
2013-10-27 05:04:19 C 11 59 36.87 +17 07 09.1 – w I72
2013-10-27 05:06:53 C 11 59 37.78 +17 06 58.5 – w I72
2013-10-27 05:09:28 C 11 59 38.56 +17 06 47.3 – w I72
2013-10-27 05:21:05 C 11 59 42.50 +17 05 58.3 – w C86
2013-10-27 05:23:43 C 11 59 43.43 +17 05 47.4 – w J01
2013-10-27 05:24:35 C 11 59 43.68 +17 05 46.0 – w C86
2013-10-27 05:25:44 C 11 59 43.98 +17 05 40.9 – w C86
2013-10-27 05:45:51 C 11 59 51.10 +17 04 12.9 – w J01
2013-10-27 11:27:03 C 12 01 47.05 +16 40 07.5 – u H06
2013-10-27 11:36:35 C 12 01 50.31 +16 39 24.8 – u H06
2013-10-27 11:46:37 C 12 01 53.71 +16 38 44.8 – u H06
2013-10-27 19:23:33 C 12 04 26.63 +16 06 31.8 – q D95
2013-10-27 19:25:12 C 12 04 27.16 +16 06 25.0 – q D95
2013-10-27 19:25:45 C 12 04 27.35 +16 06 22.7 – q D95
2013-10-27 19:37:30 C 12 04 31.30 +16 05 34.2 – m 372
2013-10-27 19:46:44 C 12 04 34.38 +16 04 55.4 – m 372
2013-10-28 04:36:56 C 12 07 29.23 +15 27 47.8 – d A77
2013-10-28 04:47:33 C 12 07 32.64 +15 27 03.4 – d A77
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)