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
2012-08-27 10:52:07 c 23 27 10.976 +00 28 24.94 – L F51
2012-08-27 10:56:22 c 23 27 10.785 +00 28 24.05 – L F51
2012-08-27 11:04:53 c 23 27 10.455 +00 28 22.43 – L F51
2012-08-29 02:06:25 C 23 25 38.24 +00 20 34.7 – r 106
2012-08-29 02:22:42 C 23 25 37.60 +00 20 31.2 – r 106
2012-08-29 02:38:58 C 23 25 36.92 +00 20 28.0 – r 106
2012-09-08 21:50:07 C 23 14 54.49 -00 35 44.4 – r 215
2012-09-08 21:52:52 C 23 14 54.38 -00 35 45.1 – r 215
2012-09-08 21:55:38 C 23 14 54.26 -00 35 46.2 – r 215
2012-09-12 00:50:30 C 23 11 42.60 -00 53 04.2 – w 213
2012-09-12 01:31:58 C 23 11 40.81 -00 53 14.1 – w 213
2012-09-12 02:18:17 C 23 11 38.80 -00 53 25.2 – w 213
2012-09-14 23:48:40 C 23 08 40.87 -01 09 44.0 – w J36
2012-09-14 23:56:52 C 23 08 40.52 -01 09 46.1 – w J36
2012-09-15 00:05:04 C 23 08 40.17 -01 09 48.1 – w J36
2012-09-15 08:26:37 C 23 08 18.67 -01 11 45.1 – r G96
2012-09-15 08:33:17 C 23 08 18.42 -01 11 47.0 – r G96
2012-09-15 08:39:54 C 23 08 18.16 -01 11 48.6 – r G96
2012-09-15 08:46:37 C 23 08 17.80 -01 11 50.1 – r G96
2012-09-16 00:21:38 C 23 07 38.09 -01 15 32.2 – w J36
2012-09-16 00:31:07 C 23 07 37.68 -01 15 34.3 – w J36
2012-09-16 00:40:35 C 23 07 37.28 -01 15 36.3 – w J36
2012-09-17 21:59:24 C 23 05 41.87 -01 26 19.2 – u C10
2012-09-17 22:41:15 C 23 05 40.14 -01 26 29.4 – u C10
2012-09-19 21:37:20 C 23 03 41.43 -01 37 35.5 – u C10
2012-09-19 21:52:24 C 23 03 40.69 -01 37 39.8 – u C10
2012-09-19 22:07:18 C 23 03 40.20 -01 37 42.5 – u C10
2012-09-19 22:24:29 C 23 03 39.40 -01 37 46.9 – u C10
2012-09-25 04:04:03 C 22 58 28.20 -02 07 16.4 – r G96
2012-09-25 04:12:22 C 22 58 27.87 -02 07 18.1 – r G96
2012-09-25 04:20:34 C 22 58 27.51 -02 07 20.1 – r G96
2012-09-25 04:28:44 C 22 58 27.15 -02 07 22.4 – r G96
2012-10-13 20:06:37 C 22 42 24.03 -03 42 21.7 – u 586
2012-10-13 20:18:33 C 22 42 23.56 -03 42 22.9 – u 586
2013-07-13 14:01:40 C 02 22 52.748 +21 44 35.94 – L F51
2013-07-13 14:09:36 C 02 22 53.254 +21 44 39.68 – L F51
2013-07-13 14:24:28 C 02 22 54.199 +21 44 46.81 – L F51
2013-08-05 01:17:55 C 03 00 38.54 +26 20 24.0 – q 104
2013-08-05 01:26:10 C 03 00 39.16 +26 20 27.5 – q 104
2013-08-05 01:32:51 C 03 00 39.69 +26 20 31.6 – q 104
2013-08-05 01:34:24 C 03 00 39.80 +26 20 32.6 – q 104
2013-08-05 08:14:09 C 03 01 10.66 +26 24 23.8 – r Y00
2013-08-05 08:20:48 C 03 01 11.16 +26 24 26.9 – r Y00
2013-08-05 08:27:25 C 03 01 11.61 +26 24 30.4 – r Y00
2013-08-07 09:39:08 C 03 05 03.73 +26 52 20.0 – c H06
2013-08-07 09:42:52 C 03 05 04.02 +26 52 22.3 – c H06
2013-08-07 09:46:37 C 03 05 04.31 +26 52 24.5 – c H06
2013-08-07 23:17:20 C 03 06 08.97 +27 00 09.0 – u 585
2013-08-07 23:21:22 C 03 06 09.30 +27 00 11.2 – u 585
2013-08-07 23:25:25 C 03 06 09.67 +27 00 13.2 – u 585
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)