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
2017-08-12 10:54:55 C 20 44 07.85 -26 14 26.5 – L T05
2017-08-12 11:07:23 C 20 44 06.88 -26 14 26.4 – L T05
2017-08-15 08:56:36 C 20 38 48.977 -26 18 05.06 – L F51
2017-08-15 09:26:54 C 20 38 46.698 -26 18 06.23 – L F51
2017-08-15 09:42:04 C 20 38 45.557 -26 18 06.81 – L F51
2017-09-12 10:27:14 C 20 07 34.03 -25 40 37.8 – q Q68
2017-09-12 11:55:05 C 20 07 32.05 -25 40 27.7 – q Q68
2017-09-14 07:55:16 C 20 06 40.691 -25 35 19.51 – U 568
2017-09-14 07:56:58 C 20 06 40.658 -25 35 19.30 – U 568
2017-09-24 10:09:07 C 20 04 06.17 -25 03 43.0 – q Q68
2017-09-24 11:11:37 C 20 04 05.92 -25 03 34.0 – q Q68
2018-07-20 11:22:17 C 23 12 50.36 -04 36 55.1 – – 568
2018-07-20 11:55:43 C 23 12 49.58 -04 36 58.6 – – 568
2018-07-20 11:59:07 C 23 12 49.51 -04 36 59.0 – – 568
2018-07-20 12:04:13 C 23 12 49.39 -04 36 59.5 – – 568
2018-08-08 11:47:56 C 22 59 38.521 -05 42 19.94 – U F51
2018-08-08 12:04:56 C 22 59 37.919 -05 42 22.97 – U F51
2018-08-08 12:38:59 C 22 59 36.709 -05 42 28.99 – U F51
2018-08-11 12:03:54 C 22 57 04.441 -05 55 28.41 – U F51
2018-08-11 12:21:10 C 22 57 03.805 -05 55 31.57 – U F51
2018-08-11 12:38:28 C 22 57 03.161 -05 55 34.83 – U F51
2018-08-11 12:55:50 C 22 57 02.519 -05 55 38.07 – U F51
2018-09-01 08:35:00 C 22 37 16.58 -07 37 31.5 – V 703
2018-09-01 08:42:47 C 22 37 16.32 -07 37 33.6 – V 703
2018-09-01 08:50:34 C 22 37 16.03 -07 37 37.1 – V 703
2018-09-01 08:58:22 C 22 37 15.78 -07 37 38.0 – V 703
2018-09-07 04:57:27 C 22 31 32.80 -08 06 53.8 – V 703
2018-09-07 05:05:46 C 22 31 32.43 -08 06 57.0 – V 703
2018-09-07 05:14:03 C 22 31 32.09 -08 06 58.9 – V 703
2018-09-07 05:22:21 C 22 31 31.81 -08 06 59.7 – V 703
2018-09-07 06:04:42 C 22 31 30.01 -08 07 08.4 – V G96
2018-09-07 06:12:50 C 22 31 29.68 -08 07 10.2 – V G96
2018-09-07 06:20:57 C 22 31 29.34 -08 07 11.6 – V G96
2018-09-07 06:29:03 C 22 31 29.01 -08 07 13.6 – V G96
2018-09-14 04:29:43 C 22 24 54.87 -08 40 36.0 – V G96
2018-09-14 04:38:00 C 22 24 54.56 -08 40 37.8 – V G96
2018-09-14 04:46:18 C 22 24 54.23 -08 40 39.4 – V G96
2018-09-14 04:54:34 C 22 24 53.90 -08 40 40.9 – V G96
2018-10-04 20:28:07 C 22 08 23.80 -10 02 25.1 – q 215
2018-10-04 20:31:50 C 22 08 23.79 -10 02 25.6 – q 215
2018-10-04 20:35:31 C 22 08 23.75 -10 02 26.2 – q 215
2018-10-05 06:54:05 C 22 08 07.101 -10 03 45.50 – U F52
2018-10-05 07:11:02 C 22 08 06.648 -10 03 47.74 – U F52
2018-10-05 07:27:53 C 22 08 06.180 -10 03 49.83 – U F52
2018-11-05 18:20:00 C 21 57 03.64 -10 53 24.2 20.4 q 215
2018-11-05 18:24:37 C 21 57 03.63 -10 53 24.4 20.7 q 215
2019-06-11 14:02:58 C 00 20 09.051 +05 51 14.85 – U F51
2019-06-11 14:10:23 C 00 20 09.198 +05 51 16.29 – U F51
2019-06-11 14:17:48 C 00 20 09.343 +05 51 17.72 – U F51
2019-06-11 14:25:14 C 00 20 09.495 +05 51 19.17 – U F51
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)