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
2016-12-26 19:26:31 C 22 58 22.51 +04 00 31.2 – q J22
2016-12-26 19:28:18 C 22 58 22.57 +04 00 31.2 – q J22
2016-12-26 19:30:06 C 22 58 22.62 +04 00 31.5 – q J22
2016-12-26 20:08:57 C 22 58 23.48 +04 00 32.0 – w 212
2016-12-26 20:15:10 C 22 58 23.69 +04 00 32.1 – w 212
2016-12-26 20:23:26 C 22 58 23.86 +04 00 33.0 – w 212
2016-12-27 23:50:34 C 22 59 06.86 +04 01 34.7 – Q I17
2016-12-27 23:57:13 C 22 59 07.02 +04 01 35.0 – Q I17
2016-12-28 00:05:37 C 22 59 07.22 +04 01 35.5 – Q I17
2016-12-28 00:36:33 C 22 59 08.07 +04 01 37.2 – q H45
2016-12-28 00:40:24 C 22 59 08.21 +04 01 37.4 – q H45
2016-12-28 00:43:00 C 22 59 08.24 +04 01 37.6 – q H45
2016-12-28 10:23:36 C 22 59 23.85 +04 02 04.2 – m 349
2016-12-28 10:42:48 C 22 59 24.36 +04 02 05.1 – m 349
2016-12-28 10:43:44 C 22 59 24.32 +04 02 03.9 – q Q11
2016-12-28 10:47:51 C 22 59 24.43 +04 02 04.7 – q Q11
2016-12-28 10:50:57 C 22 59 24.50 +04 02 04.8 – q Q11
2016-12-28 17:16:34 C 22 59 35.30 +04 02 22.7 – q K77
2016-12-28 17:24:36 C 22 59 35.54 +04 02 23.4 – q 160
2016-12-28 17:27:55 C 22 59 35.61 +04 02 24.1 – q 160
2016-12-28 17:31:04 C 22 59 35.64 +04 02 24.0 – q 160
2016-12-28 17:41:53 C 22 59 35.96 +04 02 24.1 – q K77
2016-12-29 10:15:04 C 23 00 03.72 +04 03 16.7 – m 349
2016-12-29 10:23:30 C 23 00 03.96 +04 03 17.1 – m 349
2016-12-29 19:57:04 C 23 00 20.47 +04 03 51.7 – q G40
2016-12-29 20:08:35 C 23 00 20.76 +04 03 52.1 – q G40
2016-12-30 17:46:20 C 23 00 59.19 +04 05 12.9 – q C23
2016-12-30 17:52:35 C 23 00 59.35 +04 05 12.7 – q C23
2016-12-30 17:58:49 C 23 00 59.52 +04 05 13.3 – q C23
2016-12-30 18:05:03 C 23 00 59.72 +04 05 13.4 – q C23
2016-12-30 18:36:50 C 23 01 00.60 +04 05 16.5 – q A77
2016-12-30 19:34:07 C 23 01 02.25 +04 05 20.2 – q A77
2016-12-30 19:53:51 C 23 01 02.83 +04 05 19.9 – t 510
2016-12-30 20:04:30 C 23 01 03.18 +04 05 21.5 – t 510
2016-12-30 20:15:10 C 23 01 03.52 +04 05 22.8 – t 510
2016-12-30 20:25:49 C 23 01 03.84 +04 05 23.4 – t 510
2016-12-31 17:10:40 C 23 01 42.07 +04 06 52.6 – q 215
2016-12-31 17:12:31 C 23 01 42.12 +04 06 53.0 – q 215
2016-12-31 17:14:21 C 23 01 42.18 +04 06 53.1 – q 215
2016-12-31 17:17:31 C 23 01 42.29 +04 06 53.3 – q K77
2016-12-31 17:27:52 C 23 01 42.61 +04 06 53.7 – q K77
2016-12-31 17:52:22 C 23 01 43.46 +04 06 56.7 – d A77
2016-12-31 18:06:33 C 23 01 43.65 +04 06 58.4 – d A77
2016-12-31 18:07:12 C 23 01 43.78 +04 06 57.3 – q A77
2016-12-31 18:10:55 C 23 01 43.93 +04 06 57.5 – q 160
2016-12-31 18:14:20 C 23 01 44.04 +04 06 57.8 – q 160
2016-12-31 18:17:44 C 23 01 44.14 +04 06 58.0 – q 160
2016-12-31 18:21:10 C 23 01 44.21 +04 07 00.1 – d A77
2016-12-31 18:35:02 C 23 01 44.41 +04 07 01.9 – d A77
2016-12-31 18:58:10 C 23 01 45.33 +04 07 01.2 – q A77
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)