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
2003-11-08 17:09:06 C 22 12 13.13 +41 11 27.3 – d 048
2003-11-08 17:10:16 C 22 12 12.48 +41 11 25.0 – d 048
2003-11-08 17:15:36 C 22 12 09.42 +41 11 14.0 – d 048
2003-11-08 17:19:43 C 22 12 07.07 +41 11 05.7 – d 048
2003-11-08 19:11:53 C 22 11 03.36 +41 07 18.2 – d A46
2003-11-08 19:13:01 C 22 11 02.75 +41 07 15.7 – d A46
2003-11-08 19:14:07 C 22 11 02.07 +41 07 12.9 – d A46
2003-11-08 19:15:14 C 22 11 01.48 +41 07 11.1 – d A46
2003-11-08 19:16:20 C 22 11 00.89 +41 07 08.8 – d A46
2003-11-08 19:18:33 C 22 10 59.47 +41 07 03.8 – d A46
2003-11-11 00:00:58 C 21 41 26.32 +39 00 42.1 – c 945
2003-11-11 00:04:45 C 21 41 24.55 +39 00 32.1 – c 945
2003-11-11 00:16:50 C 21 41 17.53 +38 59 57.3 – c 945
2003-11-11 17:02:34 C 21 32 00.88 +38 12 12.2 – c A32
2003-11-11 17:05:48 C 21 31 59.05 +38 12 02.4 – c A32
2003-11-11 17:09:03 C 21 31 57.26 +38 11 53.1 – c A32
2003-11-11 17:12:17 C 21 31 55.45 +38 11 43.3 – c A32
2003-11-11 17:15:32 C 21 31 53.59 +38 11 33.6 – c A32
2003-11-11 18:35:04 C 21 31 08.85 +38 07 38.4 – d 048
2003-11-11 18:37:28 C 21 31 07.50 +38 07 31.1 – d 048
2003-11-11 18:39:15 C 21 31 06.51 +38 07 25.8 – d 048
2003-11-11 18:41:03 C 21 31 05.48 +38 07 20.3 – d 048
2003-11-11 18:44:00 C 21 31 03.81 +38 07 11.7 – d 048
2003-11-11 22:00:51 C 21 29 14.02 +37 57 18.5 – r 213
2003-11-11 22:01:43 C 21 29 13.51 +37 57 15.4 – r 213
2003-11-11 22:02:50 C 21 29 12.89 +37 57 12.3 – r 213
2003-11-12 00:17:57 C 21 28 00.68 +37 50 36.4 – c H41
2003-11-12 00:26:34 C 21 27 55.84 +37 50 09.7 – c H41
2003-11-12 00:29:13 C 21 27 54.43 +37 50 02.5 – c H41
2003-11-12 00:31:32 C 21 27 52.99 +37 49 53.4 – c H41
2003-11-12 00:34:47 C 21 27 51.34 +37 49 44.9 – c H41
2003-11-12 00:38:19 C 21 27 49.23 +37 49 34.2 – c H41
2003-11-12 00:47:28 C 21 27 44.11 +37 49 05.8 – c H41
2003-11-12 01:44:44 C 21 27 12.21 +37 46 09.9 – c H41
2003-11-12 01:47:54 C 21 27 10.20 +37 45 59.5 – c H41
2003-11-12 12:41:53 C 21 21 09.59 +37 11 35.4 – c 900
2003-11-12 12:43:01 C 21 21 08.89 +37 11 32.0 – c 900
2003-11-12 16:35:47 C 21 19 04.07 +36 58 56.9 – c A32
2003-11-12 16:38:02 C 21 19 02.80 +36 58 49.7 – c A32
2003-11-12 16:42:31 C 21 19 00.29 +36 58 34.8 – c A32
2003-11-12 16:44:45 C 21 18 59.11 +36 58 27.7 – c A32
2003-11-12 16:47:01 C 21 18 57.88 +36 58 20.6 – c A32
2003-11-12 17:34:09 C 21 18 31.66 +36 55 50.6 – c 235
2003-11-12 18:14:37 C 21 18 09.90 +36 53 35.7 – c J93
2003-11-12 18:16:42 C 21 18 08.69 +36 53 28.6 – c J93
2003-11-12 18:20:49 C 21 18 06.73 +36 53 15.4 – c J93
2003-11-12 19:27:41 C 21 17 29.07 +36 49 34.1 – d 048
2003-11-12 19:28:17 C 21 17 28.70 +36 49 32.3 – d 048
2003-11-12 19:28:51 C 21 17 28.43 +36 49 30.1 – d 048
2003-11-12 19:29:27 C 21 17 28.09 +36 49 28.4 – d 048
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)