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
2013-08-30 02:18:16 C 03 57 07.65 +32 50 50.5 – d A77
2013-08-30 02:31:00 C 03 57 09.14 +32 51 00.7 – d A77
2013-08-30 03:06:48 C 03 57 13.46 +32 51 27.0 – w I72
2013-08-30 03:23:16 C 03 57 15.42 +32 51 39.9 – w I72
2013-08-30 04:03:39 C 03 57 20.12 +32 52 10.9 – w I72
2013-08-31 00:20:11 C 03 59 47.47 +33 07 45.5 – w J38
2013-08-31 00:21:24 C 03 59 47.61 +33 07 47.0 – w J38
2013-08-31 00:25:05 C 03 59 48.04 +33 07 50.3 – w J38
2013-08-31 02:01:41 C 03 59 59.83 +33 09 07.2 – o A77
2013-08-31 02:06:05 C 04 00 00.34 +33 09 11.8 – o A77
2013-08-31 02:10:24 C 04 00 00.82 +33 09 13.9 – o A77
2013-08-31 02:14:44 C 04 00 01.39 +33 09 17.5 – o A77
2013-08-31 02:17:59 C 04 00 01.78 +33 09 19.9 – o A77
2013-08-31 02:34:49 C 04 00 03.74 +33 09 32.9 – o A77
2013-08-31 02:40:29 C 04 00 04.47 +33 09 37.4 – o A77
2013-08-31 02:46:09 C 04 00 05.15 +33 09 41.6 – o A77
2013-08-31 03:15:23 C 04 00 08.79 +33 10 04.6 – w I72
2013-08-31 03:55:39 C 04 00 13.63 +33 10 36.0 – w I72
2013-08-31 04:03:52 C 04 00 14.59 +33 10 42.5 – w I72
2013-09-01 00:17:40 C 04 02 45.38 +33 26 30.4 – q C73
2013-09-01 00:18:50 C 04 02 45.52 +33 26 31.3 – q C73
2013-09-01 00:20:00 C 04 02 45.66 +33 26 32.1 – q C73
2013-09-01 00:21:10 C 04 02 45.80 +33 26 33.1 – q C73
2013-09-01 02:12:22 C 04 02 59.76 +33 28 00.2 – q C23
2013-09-01 02:29:16 C 04 03 01.83 +33 28 13.6 – q C23
2013-09-01 02:41:34 C 04 03 03.38 +33 28 23.7 – q C23
2013-09-01 03:11:50 C 04 03 07.20 +33 28 48.4 – w I72
2013-09-01 03:20:08 C 04 03 08.28 +33 28 55.8 – w I72
2013-09-01 03:24:17 C 04 03 08.82 +33 28 59.0 – w I72
2013-09-02 02:05:32 C 04 06 02.63 +33 46 58.5 – w J01
2013-09-02 02:19:07 C 04 06 04.35 +33 47 09.8 – w J01
2013-09-02 02:57:32 C 04 06 09.29 +33 47 40.8 – w J01
2013-09-02 03:08:47 C 04 06 10.71 +33 47 50.2 – w I72
2013-09-02 03:17:08 C 04 06 11.76 +33 47 57.0 – w I72
2013-09-02 03:21:18 C 04 06 12.30 +33 48 00.3 – w I72
2013-09-02 03:50:49 C 04 06 15.94 +33 48 23.1 – w J24
2013-09-02 03:55:41 C 04 06 16.56 +33 48 28.3 – w J24
2013-09-02 04:00:52 C 04 06 17.26 +33 48 33.1 – w J24
2013-09-02 22:19:51 C 04 08 41.63 +34 03 12.5 – q K60
2013-09-02 23:11:32 C 04 08 48.39 +34 03 56.8 – q K60
2013-09-02 23:37:37 C 04 08 51.83 +34 04 16.5 – q 970
2013-09-02 23:45:12 C 04 08 52.83 +34 04 22.8 – q 970
2013-09-02 23:45:22 C 04 08 52.63 +34 04 22.5 – q C23
2013-09-03 00:03:17 C 04 08 55.24 +34 04 38.2 – q K60
2013-09-03 00:03:50 C 04 08 55.16 +34 04 37.8 – q C23
2013-09-03 00:21:02 C 04 08 57.57 +34 04 52.4 – q C23
2013-09-03 01:29:38 C 04 09 06.59 +34 05 49.8 – u 235
2013-09-03 02:14:09 C 04 09 12.51 +34 06 26.1 – q B83
2013-09-03 02:19:07 C 04 09 13.10 +34 06 30.4 – u 235
2013-09-03 02:20:43 C 04 09 13.38 +34 06 31.5 – q B83
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)