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
1996-08-18 18:11:59 C 00 28 13.65 +09 53 19.3 – – 360
1996-08-20 15:02:20 C 00 26 52.90 +09 50 42.2 – – 421
1996-08-20 15:17:17 C 00 26 52.33 +09 50 40.7 – – 421
1996-08-22 00:20:20 C 00 25 49.17 +09 48 22.5 – – 118
1996-08-22 00:24:39 C 00 25 49.05 +09 48 21.9 – – 118
1996-08-23 23:28:07 C 00 24 14.39 +09 44 32.8 – – 118
1996-08-24 23:29:53 C 00 23 23.78 +09 42 21.5 – – 118
1996-09-10 16:40:29 C 00 05 52.45 +08 40 16.8 – – 360
1996-09-10 16:48:30 C 00 05 52.01 +08 40 15.2 – – 360
1996-09-19 09:04:16 C 23 54 41.30 +07 49 33.8 – – 696
1996-09-19 09:17:38 C 23 54 40.52 +07 49 30.2 – – 696
1996-09-19 09:27:56 C 23 54 39.91 +07 49 27.3 – – 696
1996-10-04 04:47:38 c 23 34 19.36 +06 01 34.3 – – 691
1996-10-04 05:18:10 c 23 34 17.60 +06 01 24.2 – – 691
1996-10-05 14:28:14 C 23 32 24.64 +05 50 30.6 – – 360
1996-10-05 14:35:14 C 23 32 24.25 +05 50 28.1 – – 360
1996-10-12 04:03:25 c 23 23 44.89 +04 58 11.3 – – 691
1996-10-12 04:34:08 c 23 23 42.98 +04 58 01.4 – – 691
1996-10-12 05:04:44 c 23 23 41.32 +04 57 51.8 – – 691
1996-10-12 22:01:50 C 23 22 47.39 +04 52 13.7 – – 118
1996-10-12 22:20:20 C 23 22 46.42 +04 52 07.4 – – 118
1996-10-16 13:20:15 C 23 18 18.15 +04 23 33.1 – – 360
1996-10-16 13:27:00 C 23 18 17.79 +04 23 30.3 – – 360
1996-11-03 18:35:02 C 23 00 22.78 +02 16 00.3 – – 118
1996-11-03 19:03:07 C 23 00 21.87 +02 15 53.5 – – 118
1996-11-04 20:30:01 C 22 59 35.73 +02 09 42.4 – – 118
1996-11-04 20:53:19 C 22 59 35.03 +02 09 36.8 – – 118
1996-12-28 09:40:45 C 23 01 28.07 +01 00 07.4 – – 360
1996-12-28 09:58:00 C 23 01 28.51 +01 00 09.2 – – 360
1996-12-30 10:56:02 C 23 02 53.87 +01 06 35.3 – – 867
1996-12-30 11:09:02 C 23 02 54.27 +01 06 37.1 – – 867
1996-12-30 11:20:02 C 23 02 54.60 +01 06 40.0 – – 867
1997-06-04 08:11:49 C 06 08 40.32 +15 36 24.3 – – 422
1997-06-04 08:12:36 C 06 08 40.55 +15 36 21.7 – – 422
1997-06-05 08:07:55 C 06 11 06.50 +14 48 40.9 – – 422
1997-06-05 08:09:29 C 06 11 06.72 +14 48 37.5 – – 422
1997-06-08 08:23:02 C 06 17 48.85 +12 12 23.2 – – 422
1997-06-23 08:35:52 C 06 56 18.43 -10 09 01.5 – – 422
1997-06-24 08:39:57 C 07 00 38.17 -12 43 36.7 – – 422
1997-06-24 08:43:11 C 07 00 38.98 -12 43 55.0 – – 422
1997-06-24 08:47:00 C 07 00 39.52 -12 44 24.1 – – 422
1997-06-24 08:50:07 C 07 00 40.12 -12 44 44.1 – – 422
1997-06-26 08:52:28 C 07 10 55.53 -18 35 35.0 – – 422
1997-06-27 08:39:56 C 07 17 01.72 -21 52 01.5 – – 422
1997-06-27 08:42:46 C 07 17 02.47 -21 52 28.3 – – 422
1997-06-27 08:44:10 C 07 17 02.98 -21 52 39.6 – – 422
1997-06-27 08:45:34 C 07 17 03.36 -21 52 50.7 – – 422
1997-06-27 08:49:43 C 07 17 04.26 -21 53 28.1 – – 422
1997-06-27 08:52:55 C 07 17 05.20 -21 53 52.9 – – 422
1997-06-28 08:56:53 C 07 24 09.44 -25 28 51.4 – – 422
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)