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
2017-02-27 17:26:00 C 00 08 39.75 +06 12 16.6 – q 585
2017-02-27 17:26:33 C 00 08 39.74 +06 12 16.3 – q 585
2017-02-27 17:27:35 C 00 08 39.75 +06 12 15.8 – q 585
2017-02-27 17:28:07 C 00 08 39.72 +06 12 15.9 – q 585
2017-02-27 17:30:12 C 00 08 39.68 +06 12 12.7 – q 585
2017-02-27 17:30:43 C 00 08 39.68 +06 12 12.4 – q 585
2017-02-27 17:31:14 C 00 08 39.72 +06 12 12.9 – q 585
2017-02-27 17:31:45 C 00 08 39.70 +06 12 11.9 – q 585
2017-03-02 18:35:35 C 00 05 39.03 +04 38 19.1 – q A77
2017-03-02 18:37:48 C 00 05 38.92 +04 38 16.0 – q A77
2017-03-02 18:48:48 C 00 05 38.15 +04 37 58.6 – q A77
2017-03-02 18:51:33 C 00 05 38.06 +04 37 52.9 – q A77
2017-03-04 09:20:51 C 00 02 14.47 +03 26 13.8 – m 349
2017-03-04 09:23:21 C 00 02 14.25 +03 26 08.9 – m 349
2017-03-04 09:25:51 C 00 02 13.95 +03 26 03.3 – m 349
2017-03-28 09:39:24 C 22 33 24.13 -17 34 09.7 – U W88
2017-03-28 09:41:12 C 22 33 24.03 -17 34 10.3 – U W88
2017-03-28 09:49:35 C 22 33 23.87 -17 34 14.7 – U W88
2017-03-28 09:51:23 C 22 33 23.82 -17 34 15.2 – U W88
2017-04-09 19:08:23 C 22 35 31.19 -18 08 21.1 – v Q62
2017-04-09 19:11:58 C 22 35 31.29 -18 08 21.2 – v Q62
2017-04-12 09:52:34 C 22 37 06.49 -18 03 44.3 – q W88
2017-04-12 09:59:56 C 22 37 06.66 -18 03 43.1 – q W88
2017-04-14 09:03:03 C 22 38 23.41 -17 59 19.6 – U W97
2017-04-14 09:30:10 C 22 38 24.02 -17 59 14.5 – U W97
2017-04-16 08:44:36 C 22 39 43.28 -17 54 12.5 – U W97
2017-04-16 09:29:47 C 22 39 44.55 -17 54 07.6 – U W97
2017-04-21 08:40:30 C 22 43 06.22 -17 40 22.6 – U W97
2017-04-21 09:06:28 C 22 43 06.95 -17 40 19.5 – U W97
2017-04-21 09:28:24 C 22 43 07.48 -17 40 17.5 – U W97
2017-04-29 19:09:40 C 22 48 18.60 -17 18 49.6 – v Q62
2017-04-29 19:13:20 C 22 48 18.69 -17 18 49.3 – v Q62
2017-05-16 07:56:53 C 22 54 14.37 -17 03 46.5 – q W96
2017-05-16 09:00:57 C 22 54 14.72 -17 03 48.9 – q W96
2017-05-24 06:38:34 C 22 54 15.02 -17 15 21.5 – q W96
2017-05-24 08:07:49 C 22 54 14.45 -17 15 30.9 – q W96
2017-05-26 04:09:25 C 22 53 55.18 -17 20 21.4 – q J22
2017-05-26 04:16:32 C 22 53 55.12 -17 20 22.7 – q J22
2017-05-29 05:09:16 S 22 53 05.44 -17 29 54.6 – L C51
2017-05-29 08:17:46 S 22 53 02.85 -17 30 23.1 – L C51
2017-05-29 14:34:57 S 22 52 57.48 -17 31 19.1 – L C51
2017-05-29 16:09:12 S 22 52 56.11 -17 31 33.6 – L C51
2017-05-29 18:10:07 C 22 52 54.77 -17 31 56.5 – q Q11
2017-05-29 18:27:47 C 22 52 54.48 -17 31 58.9 – q Q11
2017-05-29 22:26:23 S 22 52 50.56 -17 32 31.2 – L C51
2017-06-02 04:28:09 C 22 51 27.84 -17 45 53.9 – U G40
2017-06-02 04:45:33 C 22 51 27.44 -17 45 57.5 – U G40
2017-06-02 07:32:42 C 22 51 24.07 -17 46 22.7 – U W96
2017-06-02 07:59:17 C 22 51 23.43 -17 46 27.5 – U W96
2017-06-02 08:22:32 C 22 51 22.92 -17 46 32.4 – U W96
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)