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
2013-09-29 02:58:24 C 06 32 36.85 +43 05 49.6 – c B96
2013-09-29 02:58:53 C 06 32 37.31 +43 05 50.4 – q C23
2013-09-29 03:01:47 C 06 32 38.34 +43 05 52.3 – c B96
2013-09-29 03:05:11 C 06 32 39.84 +43 05 54.6 – c B96
2013-09-29 03:11:21 C 06 32 41.98 +43 05 57.0 – q C23
2013-09-29 03:28:41 C 06 32 48.82 +43 06 06.2 – q C23
2013-09-29 23:44:07 C 06 40 58.55 +43 16 00.4 – q I81
2013-09-29 23:49:44 C 06 41 01.08 +43 16 02.9 – q I81
2013-09-29 23:53:51 C 06 41 02.76 +43 16 04.9 – q I81
2013-09-30 16:04:09 C 06 47 47.55 +43 22 45.6 – u P34
2013-09-30 16:06:42 C 06 47 49.02 +43 22 46.5 – u P34
2013-09-30 16:11:21 C 06 47 50.58 +43 22 48.5 – u P34
2013-09-30 16:14:38 C 06 47 52.00 +43 22 49.7 – u P34
2013-09-30 16:17:23 C 06 47 53.13 +43 22 50.8 – u P34
2013-09-30 16:19:43 C 06 47 54.13 +43 22 51.9 – u P34
2013-09-30 16:22:22 C 06 47 55.17 +43 22 53.0 – u P34
2013-09-30 16:27:19 C 06 47 57.34 +43 22 55.1 – u P34
2013-09-30 16:44:21 C 06 48 04.56 +43 23 02.0 – u P34
2013-09-30 16:48:31 C 06 48 06.32 +43 23 03.3 – u P34
2013-09-30 17:28:00 C 06 48 22.67 +43 23 22.1 – m 372
2013-09-30 17:36:29 C 06 48 26.27 +43 23 25.2 – m 372
2013-10-01 00:36:29 C 06 51 25.75 +43 25 44.3 – q C23
2013-10-01 00:53:07 C 06 51 32.94 +43 25 49.9 – q C23
2013-10-01 01:05:35 C 06 51 38.45 +43 25 54.9 – q C23
2013-10-01 02:54:23 C 06 52 25.79 +43 26 35.0 – q G40
2013-10-01 02:55:35 C 06 52 26.20 +43 26 39.0 – q G40
2013-10-01 03:28:45 C 06 52 40.10 +43 26 45.8 – q A77
2013-10-01 03:33:55 C 06 52 42.87 +43 26 51.0 – q G40
2013-10-01 03:35:04 C 06 52 43.32 +43 26 50.8 – q G40
2013-10-01 03:35:12 C 06 52 42.87 +43 26 48.1 – q A77
2013-10-01 03:40:01 C 06 52 45.06 +43 26 49.1 – q A77
2013-10-01 11:01:19 C 06 55 57.19 +43 28 59.1 – q H15
2013-10-01 11:04:37 C 06 55 58.57 +43 28 59.6 – q H15
2013-10-01 11:08:32 C 06 56 00.30 +43 29 00.8 – q H15
2013-10-01 11:12:25 C 06 56 02.02 +43 29 01.9 – q H15
2013-10-01 17:45:29 C 06 58 55.92 +43 30 37.7 – m 372
2013-10-01 17:53:30 C 06 58 59.43 +43 30 39.6 – – 372
2013-10-01 23:50:42 C 07 01 38.94 +43 31 48.2 – o A32
2013-10-01 23:55:27 C 07 01 41.17 +43 31 49.7 – o A32
2013-10-02 00:00:12 C 07 01 43.26 +43 31 50.6 – o A32
2013-10-02 01:17:06 C 07 02 18.08 +43 32 09.0 – q A71
2013-10-02 01:21:50 C 07 02 20.03 +43 32 09.8 – q A71
2013-10-02 01:24:57 C 07 02 21.47 +43 32 10.7 – q A71
2013-10-02 01:29:40 C 07 02 23.62 +43 32 11.7 – q A71
2013-10-02 01:31:15 C 07 02 24.36 +43 32 12.5 – q A71
2013-10-02 02:46:55 C 07 02 58.14 +43 32 25.6 – q C23
2013-10-02 02:51:05 C 07 03 00.04 +43 32 25.6 – q C23
2013-10-02 02:56:03 C 07 03 02.12 +43 32 26.2 – c B96
2013-10-02 02:57:48 C 07 03 03.10 +43 32 28.1 – c B96
2013-10-02 02:59:35 C 07 03 03.89 +43 32 27.8 – c B96
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)