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
2003-10-27 00:06:44 C 00 35 25.73 +43 15 26.7 – r 967
2003-10-27 01:48:57 C 00 34 52.25 +43 16 37.7 – c H41
2003-10-27 01:53:25 C 00 34 50.67 +43 16 40.9 – c H41
2003-10-27 01:56:17 C 00 34 49.67 +43 16 42.7 – c H41
2003-10-27 01:59:00 C 00 34 48.69 +43 16 44.5 – c H41
2003-10-27 02:09:00 C 00 34 45.17 +43 16 51.4 – c H41
2003-10-27 02:12:26 C 00 34 43.98 +43 16 53.6 – c H41
2003-10-27 12:56:19 C 00 30 58.06 +43 23 38.8 – m 379
2003-10-27 12:58:20 C 00 30 57.26 +43 23 39.5 – m 379
2003-10-27 13:04:27 C 00 30 55.11 +43 23 43.4 – m 379
2003-10-27 13:06:29 C 00 30 54.41 +43 23 44.8 – m 379
2003-10-27 19:53:16 C 00 28 29.73 +43 27 40.3 – c 434
2003-10-27 19:57:56 C 00 28 28.01 +43 27 43.5 – c 434
2003-10-27 20:00:34 C 00 28 27.05 +43 27 44.9 – c 434
2003-10-27 20:01:59 C 00 28 26.53 +43 27 45.9 – c 434
2003-10-27 20:58:20 C 00 28 05.85 +43 28 18.0 – – A30
2003-10-27 21:00:30 C 00 28 04.95 +43 28 19.8 – – A30
2003-10-27 21:03:10 C 00 28 03.99 +43 28 21.4 – – A30
2003-10-27 21:09:13 C 00 28 01.77 +43 28 24.9 – – A30
2003-10-27 21:12:15 C 00 28 00.65 +43 28 26.2 – – A30
2003-10-27 21:15:17 C 00 27 59.52 +43 28 28.3 – – A30
2003-10-27 23:52:54 C 00 27 01.36 +43 29 53.8 – c J93
2003-10-27 23:57:35 C 00 26 59.73 +43 29 57.0 – c J93
2003-10-28 00:00:25 C 00 26 59.05 +43 29 58.3 – c J93
2003-10-28 02:16:45 C 00 26 10.59 +43 31 21.1 – d 850
2003-10-28 02:31:30 C 00 26 05.11 +43 31 29.4 – d 850
2003-10-28 02:59:29 C 00 25 54.57 +43 31 45.1 – d 850
2003-10-28 03:37:45 C 00 25 40.70 +43 32 05.7 – d 850
2003-10-28 05:31:18 C 00 24 57.81 +43 33 07.4 – c H41
2003-10-28 05:38:22 C 00 24 55.05 +43 33 11.0 – c H41
2003-10-28 05:42:25 C 00 24 53.65 +43 33 12.9 – c H41
2003-10-28 05:48:59 C 00 24 51.17 +43 33 16.1 – c H41
2003-10-28 05:53:15 C 00 24 49.59 +43 33 18.3 – c H41
2003-10-28 05:56:32 C 00 24 48.39 +43 33 20.1 – c H41
2003-10-28 17:21:08 C 00 20 34.06 +43 38 59.7 – c 127
2003-10-28 17:25:45 C 00 20 32.27 +43 39 02.3 – c 127
2003-10-28 17:31:26 C 00 20 30.12 +43 39 05.2 – c 127
2003-10-28 17:33:30 C 00 20 29.20 +43 39 05.4 – c A32
2003-10-28 17:37:21 C 00 20 27.86 +43 39 08.1 – c 127
2003-10-28 17:39:58 C 00 20 26.73 +43 39 08.7 – c A32
2003-10-28 17:42:16 C 00 20 25.98 +43 39 10.9 – c 127
2003-10-28 17:46:26 C 00 20 24.26 +43 39 12.0 – c A32
2003-10-28 17:51:18 C 00 20 22.37 +43 39 14.6 – c A32
2003-10-28 17:57:46 C 00 20 19.92 +43 39 17.8 – c A32
2003-10-28 18:29:32 C 00 20 07.63 +43 39 36.0 – d 048
2003-10-28 18:31:33 C 00 20 06.83 +43 39 36.9 – d 048
2003-10-28 18:33:33 C 00 20 06.06 +43 39 38.1 – d 048
2003-10-28 18:35:33 C 00 20 05.32 +43 39 39.0 – d 048
2003-10-28 18:37:33 C 00 20 04.53 +43 39 39.9 – d 048
2003-10-28 21:25:50 C 00 18 59.53 +43 41 01.5 – r A26
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)