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
2016-09-25 23:10:21 C 00 28 31.99 +15 14 44.1 – S C47
2016-09-25 23:16:12 C 00 28 31.56 +15 14 42.6 – S C47
2016-09-25 23:22:02 C 00 28 31.13 +15 14 41.0 – S C47
2016-09-25 23:27:53 C 00 28 30.69 +15 14 39.7 – S C47
2016-09-25 23:33:12 C 00 28 30.30 +15 14 38.3 – S C47
2016-09-26 01:03:04 C 00 28 23.76 +15 14 16.5 – q C23
2016-09-26 01:11:22 C 00 28 23.16 +15 14 14.1 – q C23
2016-09-26 01:15:32 C 00 28 22.81 +15 14 13.3 – q C23
2016-09-26 22:14:48 C 00 26 50.78 +15 08 53.8 – q I81
2016-09-26 22:23:00 C 00 26 50.16 +15 08 51.6 – q I81
2016-09-26 22:33:14 C 00 26 49.40 +15 08 48.4 – q I81
2016-09-27 21:16:54 C 00 25 08.35 +15 02 50.1 – S C47
2016-09-27 21:22:13 C 00 25 07.96 +15 02 48.4 – S C47
2016-09-27 21:27:31 C 00 25 07.55 +15 02 47.1 – S C47
2016-09-27 21:32:50 C 00 25 07.14 +15 02 45.8 – S C47
2016-09-27 21:38:09 C 00 25 06.75 +15 02 44.2 – S C47
2016-09-27 23:09:55 C 00 24 59.97 +15 02 21.6 – q G40
2016-09-27 23:17:38 C 00 24 59.38 +15 02 19.6 – q G40
2016-09-27 23:25:59 C 00 24 58.74 +15 02 17.3 – q G40
2016-09-29 21:26:38 C 00 21 29.62 +14 49 16.0 – q A71
2016-09-29 21:50:02 C 00 21 27.82 +14 49 08.8 – q A71
2016-09-29 22:13:26 C 00 21 25.98 +14 49 02.1 – q A71
2016-09-30 03:42:06 C 00 21 00.95 +14 47 25.8 – q V83
2016-09-30 03:51:42 C 00 21 00.22 +14 47 22.8 – q V83
2016-09-30 04:10:38 C 00 20 58.70 +14 47 17.5 – q V83
2016-09-30 10:09:52 C 00 20 31.08 +14 45 33.9 – L T05
2016-09-30 10:36:46 C 00 20 28.81 +14 45 23.8 – L T05
2016-09-30 11:08:17 C 00 20 26.34 +14 45 14.4 – L T05
2016-09-30 11:16:59 C 00 20 25.63 +14 45 11.9 – L T05
2016-09-30 19:48:32 C 00 19 46.40 +14 42 33.5 – q A71
2016-09-30 20:19:46 C 00 19 43.98 +14 42 24.1 – q A71
2016-09-30 20:50:33 C 00 19 41.51 +14 42 14.7 – q A71
2016-10-02 04:19:18 C 00 17 14.38 +14 32 24.9 – q G96
2016-10-02 04:23:54 C 00 17 14.00 +14 32 23.4 – q G96
2016-10-02 04:28:29 C 00 17 13.65 +14 32 22.0 – q G96
2016-10-02 04:33:04 C 00 17 13.25 +14 32 19.9 – q G96
2016-10-02 22:42:19 C 00 15 47.30 +14 26 23.8 – q I81
2016-10-02 22:53:45 C 00 15 46.34 +14 26 19.7 – q I81
2016-10-02 23:01:57 C 00 15 45.72 +14 26 17.3 – q I81
2016-10-03 20:28:47 C 00 14 03.83 +14 19 07.4 – c B96
2016-10-03 20:31:11 C 00 14 03.63 +14 19 06.6 – c B96
2016-10-03 20:33:35 C 00 14 03.45 +14 19 05.9 – c B96
2016-10-03 20:35:57 C 00 14 03.26 +14 19 05.2 – c B96
2016-10-03 20:38:21 C 00 14 03.06 +14 19 04.7 – c B96
2016-10-03 20:40:43 C 00 14 02.86 +14 19 03.3 – c B96
2016-10-03 20:43:41 C 00 14 02.60 +14 19 02.5 – q C23
2016-10-03 20:51:59 C 00 14 01.95 +14 18 59.8 – q C23
2016-10-03 21:00:19 C 00 14 01.31 +14 18 56.8 – q C23
2016-10-03 21:02:48 C 00 14 01.12 +14 18 56.6 – q 160
2016-10-03 21:08:47 C 00 14 00.60 +14 18 54.6 – q 160
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)