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
2003-10-28 21:29:32 C 00 18 58.05 +43 41 02.8 – r A26
2003-10-28 21:31:11 C 00 18 57.41 +43 41 03.5 – r A26
2003-10-28 21:34:48 C 00 18 56.01 +43 41 05.2 – r A26
2003-10-28 21:38:12 C 00 18 54.68 +43 41 06.6 – r A26
2003-10-28 21:41:17 C 00 18 53.48 +43 41 08.4 – r A26
2003-10-28 21:44:11 C 00 18 52.35 +43 41 09.7 – r A26
2003-10-28 21:49:01 C 00 18 50.46 +43 41 11.9 – r A26
2003-10-28 22:08:32 C 00 18 42.86 +43 41 21.2 – r A26
2003-10-29 01:50:25 C 00 17 16.59 +43 42 48.7 – o 084
2003-10-29 01:55:37 C 00 17 14.57 +43 42 50.9 – o 084
2003-10-29 02:48:22 C 00 16 55.76 +43 43 34.0 – c H41
2003-10-29 02:56:00 C 00 16 52.80 +43 43 35.8 – c H41
2003-10-29 02:58:19 C 00 16 51.85 +43 43 36.8 – c H41
2003-10-29 03:00:44 C 00 16 50.92 +43 43 37.9 – c H41
2003-10-29 03:05:47 C 00 16 48.93 +43 43 40.2 – c H41
2003-10-29 09:08:23 C 00 14 28.20 +43 46 08.0 – m 340
2003-10-29 09:48:15 C 00 14 12.34 +43 46 26.4 – m 340
2003-10-29 10:00:46 C 00 14 07.31 +43 46 31.2 – m 340
2003-10-29 11:51:42 C 00 13 22.53 +43 47 18.1 – m 379
2003-10-29 12:01:09 C 00 13 18.86 +43 47 21.8 – m 379
2003-10-29 14:03:27 C 00 12 29.29 +43 48 09.7 – – D70
2003-10-29 14:05:28 C 00 12 28.43 +43 48 10.4 – – D70
2003-10-29 14:08:47 C 00 12 27.06 +43 48 11.7 – – D70
2003-10-29 14:51:25 C 00 12 09.68 +43 48 24.5 – m 349
2003-10-29 14:55:03 C 00 12 08.21 +43 48 25.6 – m 349
2003-10-29 15:08:32 C 00 12 02.76 +43 48 30.2 – m 349
2003-10-29 15:09:44 C 00 12 02.29 +43 48 30.6 – m 349
2003-10-29 15:38:58 C 00 11 50.55 +43 48 42.1 – – 360
2003-10-29 15:42:28 C 00 11 49.14 +43 48 43.3 – – 360
2003-10-29 15:50:02 C 00 11 46.06 +43 48 45.9 – – 360
2003-10-29 22:59:25 C 00 08 53.67 +43 51 16.1 – r 213
2003-10-29 23:00:38 C 00 08 53.16 +43 51 16.4 – r 213
2003-10-29 23:01:52 C 00 08 52.67 +43 51 17.0 – r 213
2003-10-30 01:46:51 C 00 07 44.87 +43 51 54.4 – o 084
2003-10-30 05:21:28 C 00 06 17.22 +43 53 18.1 – c H41
2003-10-30 05:28:43 C 00 06 14.22 +43 53 19.7 – c H41
2003-10-30 05:34:21 C 00 06 11.78 +43 53 21.4 – c H41
2003-10-30 05:37:09 C 00 06 10.57 +43 53 22.3 – c H41
2003-10-30 05:41:11 C 00 06 08.98 +43 53 23.2 – c H41
2003-10-30 05:47:11 C 00 06 06.40 +43 53 25.1 – c H41
2003-10-30 05:51:33 C 00 06 04.61 +43 53 25.8 – c H41
2003-10-30 06:00:13 C 00 06 01.01 +43 53 28.2 – c H41
2003-10-30 11:51:30 C 00 03 36.24 +43 55 02.9 – – 392
2003-10-30 11:55:52 C 00 03 34.67 +43 55 07.7 – m 379
2003-10-30 11:56:44 C 00 03 34.02 +43 55 04.3 – – 392
2003-10-30 12:01:58 C 00 03 31.97 +43 55 08.2 – m 379
2003-10-30 12:05:15 C 00 03 30.40 +43 55 06.5 – – 392
2003-10-30 12:11:09 C 00 03 27.89 +43 55 07.7 – – 392
2003-10-30 19:58:52 C 00 00 10.95 +43 56 53.0 – – A30
2003-10-30 20:00:45 C 00 00 10.11 +43 56 53.2 – – A30
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)