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
2006-09-16 10:08:30 C 00 18 45.90 +11 32 47.8 – r 703
2006-09-19 07:33:22 C 00 14 43.85 +11 16 55.7 – o 699
2006-09-19 08:36:35 C 00 14 39.98 +11 16 41.8 – o 699
2006-09-19 09:08:10 C 00 14 38.12 +11 16 34.3 – o 699
2006-09-21 00:36:18 C 00 12 15.88 +11 06 45.7 – r 106
2006-09-21 00:49:52 C 00 12 14.98 +11 06 42.9 – r 106
2006-09-21 01:03:26 C 00 12 14.24 +11 06 39.4 – r 106
2006-09-21 01:17:02 C 00 12 13.34 +11 06 36.1 – r 106
2006-09-23 21:23:37 C 00 08 01.69 +10 48 25.9 – o 473
2006-09-23 21:35:03 C 00 08 00.96 +10 48 22.5 – o 473
2006-09-23 22:33:32 C 00 07 57.26 +10 48 06.3 – o 473
2006-09-24 00:27:25 C 00 07 50.03 +10 47 34.4 – o 473
2006-09-24 00:48:09 C 00 07 48.72 +10 47 28.6 – o 473
2006-09-27 04:14:30 C 00 03 01.92 +10 25 31.3 – o 699
2006-09-27 04:46:06 C 00 02 59.93 +10 25 21.6 – o 699
2006-09-27 05:17:39 C 00 02 57.83 +10 25 12.7 – o 699
2006-09-27 05:49:14 C 00 02 55.76 +10 25 02.9 – o 699
2006-09-27 06:22:47 C 00 02 53.55 +10 24 52.7 – r 703
2006-09-27 06:30:29 C 00 02 53.05 +10 24 50.5 – r 703
2006-09-27 06:38:08 C 00 02 52.47 +10 24 48.1 – r 703
2006-09-27 06:45:50 C 00 02 52.04 +10 24 45.9 – r 703
2006-10-03 07:59:03 C 23 53 25.22 +09 37 49.5 – r 703
2006-10-03 08:06:43 C 23 53 24.75 +09 37 46.4 – r 703
2006-10-03 08:14:23 C 23 53 24.21 +09 37 44.4 – r 703
2006-10-03 09:38:41 C 23 53 18.63 +09 37 14.7 – r 703
2006-10-03 09:49:58 C 23 53 17.88 +09 37 11.1 – r 703
2006-10-03 10:01:16 C 23 53 17.08 +09 37 07.8 – r 703
2006-10-03 10:12:38 C 23 53 16.33 +09 37 03.1 – r 703
2006-10-11 02:39:26 C 23 41 15.82 +08 30 50.3 – c 691
2006-10-11 02:58:00 C 23 41 14.61 +08 30 43.4 – c 691
2006-10-11 03:16:35 C 23 41 13.41 +08 30 36.5 – c 691
2006-10-11 04:02:54 C 23 41 10.41 +08 30 19.4 – o 644
2006-10-11 04:32:33 C 23 41 08.48 +08 30 08.2 – o 644
2006-10-11 05:03:52 C 23 41 06.44 +08 29 56.6 – o 644
2006-10-17 02:19:55 C 23 32 15.72 +07 36 29.7 – c 691
2006-10-17 02:27:20 C 23 32 15.27 +07 36 26.8 – c 691
2006-10-17 02:50:29 C 23 32 13.84 +07 36 18.1 – c 691
2006-10-17 02:57:54 C 23 32 13.39 +07 36 15.2 – c 691
2006-10-17 03:21:04 C 23 32 11.94 +07 36 06.3 – c 691
2006-10-17 03:23:41 C 23 32 11.79 +07 36 06.1 – r 703
2006-10-17 03:28:28 C 23 32 11.49 +07 36 03.7 – c 691
2006-10-17 03:30:33 C 23 32 11.36 +07 36 03.4 – r 703
2006-10-17 03:37:28 C 23 32 10.89 +07 35 59.8 – r 703
2006-10-17 03:44:22 C 23 32 10.50 +07 35 57.4 – r 703
2006-10-19 01:58:47 C 23 29 24.13 +07 18 19.4 – c 691
2006-10-19 02:11:19 C 23 29 23.27 +07 18 15.1 – c 691
2006-10-19 02:22:26 C 23 29 22.70 +07 18 10.6 – c 691
2006-10-19 02:30:01 C 23 29 22.25 +07 18 08.1 – c 691
2006-10-19 02:41:07 C 23 29 21.58 +07 18 03.6 – c 691
2006-10-19 02:48:41 C 23 29 21.13 +07 18 00.7 – c 691
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)