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
2017-02-19 09:13:07 C 00 03 45.83 +07 37 53.4 – m 349
2017-02-19 09:17:29 C 00 03 46.05 +07 37 53.1 – m 349
2017-02-19 09:44:43 C 00 03 47.38 +07 37 51.3 – m 349
2017-02-19 09:50:22 C 00 03 47.68 +07 37 50.8 – m 349
2017-02-19 20:02:15 C 00 04 17.58 +07 37 03.7 – q J22
2017-02-19 20:05:57 C 00 04 17.72 +07 37 03.2 – q J22
2017-02-19 20:09:28 C 00 04 17.97 +07 37 02.3 – q J22
2017-02-20 00:38:22 C 00 04 30.79 +07 36 34.1 – q 850
2017-02-20 00:51:43 C 00 04 31.37 +07 36 33.5 – q H45
2017-02-20 00:53:12 C 00 04 31.45 +07 36 33.4 – q H45
2017-02-20 00:54:31 C 00 04 31.52 +07 36 33.2 – q H45
2017-02-20 00:58:11 C 00 04 31.68 +07 36 33.0 – q H45
2017-02-20 00:59:51 C 00 04 31.76 +07 36 32.7 – q H45
2017-02-20 01:01:28 C 00 04 31.83 +07 36 32.5 – q H45
2017-02-20 01:09:15 C 00 04 32.21 +07 36 31.0 – q 850
2017-02-20 18:20:51 C 00 05 19.35 +07 34 23.0 – q A77
2017-02-20 18:30:44 C 00 05 19.67 +07 34 22.9 – q A77
2017-02-20 18:41:42 C 00 05 20.44 +07 34 18.5 – q A77
2017-02-20 18:52:11 C 00 05 20.68 +07 34 20.1 – q A77
2017-02-20 19:06:10 C 00 05 21.49 +07 34 14.7 – q A77
2017-02-21 18:23:12 C 00 06 20.05 +07 29 54.4 – q A77
2017-02-21 18:32:41 C 00 06 20.26 +07 29 53.7 – q A77
2017-02-21 18:35:49 C 00 06 20.55 +07 29 50.2 – q A77
2017-02-21 18:43:11 C 00 06 20.69 +07 29 51.2 – q A77
2017-02-21 18:48:25 C 00 06 21.03 +07 29 48.0 – q A77
2017-02-23 14:51:09 C 00 07 50.49 +07 16 26.6 – q C97
2017-02-23 14:54:37 C 00 07 50.57 +07 16 25.4 – q C97
2017-02-23 20:04:54 C 00 07 58.94 +07 14 21.0 – q J22
2017-02-23 20:06:46 C 00 07 59.00 +07 14 20.6 – q J22
2017-02-23 20:12:14 C 00 07 59.16 +07 14 18.3 – q J22
2017-02-24 19:10:50 C 00 08 29.84 +07 03 31.5 – q C23
2017-02-24 19:15:09 C 00 08 29.85 +07 03 29.1 – q C23
2017-02-24 19:18:22 C 00 08 29.96 +07 03 27.7 – q C23
2017-02-25 09:20:30 C 00 08 42.66 +06 55 37.3 – m 349
2017-02-25 09:25:10 C 00 08 42.74 +06 55 33.4 – u D81
2017-02-25 09:26:28 C 00 08 42.66 +06 55 32.7 – u D81
2017-02-25 09:29:52 C 00 08 42.76 +06 55 31.8 – m 349
2017-02-25 18:24:58 C 00 08 48.44 +06 49 59.1 – q A77
2017-02-25 18:29:07 C 00 08 48.42 +06 49 54.8 – d B66
2017-02-25 18:29:56 C 00 08 48.24 +06 49 57.2 – q A77
2017-02-25 18:35:26 C 00 08 48.53 +06 49 51.2 – q A77
2017-02-25 18:40:56 C 00 08 48.40 +06 49 50.9 – q A77
2017-02-25 18:46:26 C 00 08 48.61 +06 49 45.2 – q A77
2017-02-25 18:54:59 C 00 08 48.64 +06 49 37.5 – d B66
2017-02-26 00:32:26 C 00 08 50.99 +06 45 52.4 – q 850
2017-02-26 00:52:58 C 00 08 51.06 +06 45 38.6 – q 850
2017-02-26 01:13:30 C 00 08 51.03 +06 45 21.3 – q 850
2017-02-27 17:23:11 C 00 08 39.79 +06 12 19.6 – q 585
2017-02-27 17:24:26 C 00 08 39.77 +06 12 18.1 – q 585
2017-02-27 17:24:57 C 00 08 39.79 +06 12 17.8 – q 585
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)