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
2003-09-21 20:59:04 C 02 25 49.30 +31 24 25.7 – d A46
2003-09-21 21:07:06 C 02 25 49.08 +31 24 30.0 – d A46
2003-09-21 21:10:22 C 02 25 49.05 +31 24 32.1 – d A46
2003-09-21 21:11:59 C 02 25 48.99 +31 24 32.6 – d A46
2003-09-21 21:15:15 C 02 25 48.94 +31 24 35.2 – d A46
2003-09-22 18:14:30 C 02 25 17.38 +31 38 43.5 – m 349
2003-09-22 18:19:43 C 02 25 17.19 +31 38 47.3 – m 349
2003-09-22 18:24:58 C 02 25 17.07 +31 38 51.1 – m 349
2003-09-22 18:30:11 C 02 25 16.94 +31 38 54.0 – m 349
2003-09-23 05:13:13 C 02 25 00.66 +31 46 07.0 – r 642
2003-09-23 05:17:58 C 02 25 00.45 +31 46 09.3 – r 642
2003-09-23 05:28:33 C 02 25 00.17 +31 46 16.4 – r 642
2003-09-23 23:46:38 C 02 24 28.73 +31 58 50.8 – b 967
2003-09-23 23:59:17 C 02 24 28.38 +31 58 59.3 – b 967
2003-09-24 05:05:40 C 02 24 19.77 +32 02 27.6 – r 642
2003-09-24 05:15:08 C 02 24 19.12 +32 02 36.4 – r 642
2003-09-24 05:21:26 C 02 24 18.90 +32 02 40.6 – r 642
2003-09-24 22:43:15 C 02 23 45.85 +32 14 48.0 – d A46
2003-09-24 22:44:53 C 02 23 45.82 +32 14 49.5 – d A46
2003-09-24 22:46:31 C 02 23 45.78 +32 14 51.5 – d A46
2003-09-24 22:48:07 C 02 23 45.70 +32 14 52.9 – d A46
2003-09-24 22:49:46 C 02 23 45.63 +32 14 53.8 – d A46
2003-09-24 22:53:00 C 02 23 45.51 +32 14 56.2 – d A46
2003-09-25 00:53:27 C 02 23 41.45 +32 16 22.9 – c 235
2003-09-25 05:43:46 C 02 23 32.03 +32 19 47.1 – c H44
2003-09-25 05:58:45 C 02 23 31.49 +32 19 57.4 – c H44
2003-09-25 07:27:23 C 02 23 28.28 +32 21 00.7 – c H44
2003-09-25 07:54:38 C 02 23 27.27 +32 21 21.4 – c H41
2003-09-25 08:04:22 C 02 23 26.92 +32 21 28.2 – c H41
2003-09-25 21:03:09 C 02 23 00.17 +32 30 35.7 – c A41
2003-09-25 21:51:41 C 02 22 58.36 +32 31 11.3 – c A41
2003-09-25 22:06:14 C 02 22 57.83 +32 31 21.4 – c A41
2003-09-26 05:46:11 C 02 22 41.12 +32 36 48.4 – r 642
2003-09-26 05:50:57 C 02 22 40.94 +32 36 52.4 – r 642
2003-09-26 05:55:43 C 02 22 40.74 +32 36 56.1 – r 642
2003-09-26 06:52:50 C 02 22 38.30 +32 37 42.6 – c H41
2003-09-26 07:00:21 C 02 22 38.04 +32 37 47.5 – c H41
2003-09-26 14:30:59 C 02 22 21.19 +32 43 10.6 – – 340
2003-09-26 14:34:49 C 02 22 21.08 +32 43 13.2 – – 340
2003-09-26 14:40:34 C 02 22 20.85 +32 43 17.9 – – 340
2003-09-26 14:44:57 C 02 22 20.62 +32 43 21.3 – – 340
2003-09-26 17:14:58 C 02 22 14.47 +32 45 10.5 – – 360
2003-09-26 17:18:37 C 02 22 14.32 +32 45 13.0 – – 360
2003-09-26 20:56:49 C 02 22 06.31 +32 47 47.2 – d A46
2003-09-26 21:01:03 C 02 22 06.10 +32 47 50.0 – d A46
2003-09-26 21:13:45 C 02 22 05.57 +32 47 59.7 – d A46
2003-09-26 21:15:52 C 02 22 05.49 +32 48 01.1 – d A46
2003-09-26 21:22:14 C 02 22 05.22 +32 48 05.9 – d A46
2003-09-26 21:28:35 C 02 22 04.95 +32 48 10.9 – d A46
2003-09-27 06:01:14 C 02 21 44.47 +32 54 22.4 – r 642
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)