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
2006-10-21 02:15:56 C 23 26 35.07 +06 59 59.0 – c 691
2006-10-21 02:34:35 C 23 26 33.97 +06 59 52.0 – c 691
2006-10-21 02:53:14 C 23 26 32.88 +06 59 45.0 – c 691
2006-10-21 20:05:19 C 23 25 33.86 +06 53 13.5 – c 246
2006-10-21 20:08:00 C 23 25 33.78 +06 53 13.0 – c 246
2006-10-21 20:08:50 C 23 25 33.66 +06 53 12.3 – c 246
2006-10-21 20:10:46 C 23 25 33.51 +06 53 12.1 – c 246
2006-10-21 20:11:49 C 23 25 33.42 +06 53 11.7 – c 246
2006-10-21 20:14:49 C 23 25 33.30 +06 53 11.0 – c 246
2006-10-21 20:34:51 C 23 25 32.17 +06 53 02.8 – c 246
2006-10-21 20:35:46 C 23 25 32.09 +06 53 02.1 – c 246
2006-10-21 20:36:29 C 23 25 32.07 +06 53 01.0 – c 246
2006-10-21 20:37:16 C 23 25 32.03 +06 53 02.0 – c 246
2006-10-21 20:38:04 C 23 25 31.93 +06 53 01.6 – c 246
2006-10-21 20:40:44 C 23 25 31.88 +06 53 00.5 – c 246
2006-10-22 02:24:44 C 23 25 12.57 +06 50 51.5 – o 644
2006-10-22 02:54:06 C 23 25 10.88 +06 50 40.1 – o 644
2006-10-22 03:23:43 C 23 25 09.18 +06 50 29.1 – o 644
2006-10-22 03:32:16 C 23 25 08.65 +06 50 26.1 – d 291
2006-10-22 03:37:42 C 23 25 08.34 +06 50 24.0 – d 291
2006-10-22 03:45:12 C 23 25 07.91 +06 50 21.2 – d 291
2006-10-23 02:05:13 C 23 23 53.00 +06 41 57.1 – c 691
2006-10-23 02:23:53 C 23 23 51.95 +06 41 50.3 – c 691
2006-10-23 02:42:31 C 23 23 50.90 +06 41 43.3 – c 691
2006-10-23 04:17:00 C 23 23 45.52 +06 41 08.3 – r 703
2006-10-23 04:27:46 C 23 23 44.95 +06 41 03.7 – r 703
2006-10-23 04:38:32 C 23 23 44.41 +06 40 59.7 – r 703
2006-10-23 04:49:18 C 23 23 43.69 +06 40 54.9 – r 703
2006-10-29 04:31:52 C 23 16 14.70 +05 48 23.5 – r 703
2006-10-29 04:41:53 C 23 16 14.16 +05 48 18.2 – r 703
2006-10-29 04:51:55 C 23 16 13.66 +05 48 14.3 – r 703
2006-10-29 05:01:57 C 23 16 13.12 +05 48 10.6 – r 703
2006-11-05 20:51:00 C 23 08 12.70 +04 46 42.6 – r 213
2006-11-05 20:54:31 C 23 08 12.57 +04 46 41.2 – r 213
2006-11-05 20:55:41 C 23 08 12.52 +04 46 40.9 – r 213
2006-11-11 03:27:12 C 23 03 48.88 +04 09 23.7 – r G96
2006-11-11 03:35:08 C 23 03 48.60 +04 09 21.6 – r G96
2006-11-11 03:42:51 C 23 03 48.34 +04 09 19.3 – r G96
2006-11-11 03:50:30 C 23 03 48.09 +04 09 17.1 – r G96
2006-11-12 12:21:29 – 23 02 49.47 +04 00 27.8 – – 372
2006-11-15 13:09:00 – 23 00 52.28 +03 41 57.5 – – 372
2006-11-16 03:09:35 C 23 00 32.09 +03 38 33.3 – c 704
2006-11-16 03:26:28 C 23 00 31.64 +03 38 31.2 – c 704
2006-11-16 03:43:20 C 23 00 31.14 +03 38 27.3 – c 704
2006-11-16 04:00:14 C 23 00 30.70 +03 38 22.8 – c 704
2006-11-17 10:26:30 – 22 59 49.15 +03 31 17.0 – – 372
2006-11-18 18:11:00 C 22 59 09.34 +03 24 12.6 – r J97
2006-11-19 02:26:24 C 22 58 59.44 +03 22 26.2 – r 703
2006-11-19 02:35:43 C 22 58 59.26 +03 22 23.8 – r 703
2006-11-19 02:45:03 C 22 58 59.12 +03 22 23.7 – r 703
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)