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
2021-08-16 17:42:02 C 22 28 53.35 -10 14 36.2 – q D29
2021-08-27 11:41:09 C 22 17 31.691 -11 09 48.34 – U F51
2021-08-27 11:59:11 C 22 17 30.884 -11 09 52.18 – U F51
2021-08-27 12:16:50 C 22 17 30.097 -11 09 55.92 – U F51
2021-08-27 12:34:31 C 22 17 29.303 -11 09 59.66 – U F51
2021-08-31 08:50:31 C 22 13 27.281 -11 29 03.76 – U F51
2021-08-31 09:06:22 C 22 13 26.581 -11 29 06.98 – U F51
2021-08-31 09:38:03 C 22 13 25.179 -11 29 13.46 – U F51
2021-09-01 06:32:19 C 22 12 30.87 -11 33 27.7 – U I41
2021-09-01 07:05:01 C 22 12 29.45 -11 33 34.3 – U I41
2021-09-05 07:27:13 C 22 08 22.99 -11 52 33.4 – U I41
2021-09-05 08:36:11 C 22 08 20.07 -11 52 46.4 – U I41
2021-09-10 14:07:46 C 22 03 12.20 -12 15 57.9 – V D29
2021-09-10 14:28:07 C 22 03 11.34 -12 16 01.7 – V D29
2021-09-10 14:48:29 C 22 03 10.49 -12 16 05.3 – V D29
2021-09-12 05:56:16 C 22 01 38.438 -12 22 53.21 – U F51
2021-09-12 06:08:23 C 22 01 37.962 -12 22 55.33 – U F51
2021-09-12 06:20:31 C 22 01 37.490 -12 22 57.57 – U F51
2021-09-12 06:32:41 C 22 01 37.007 -12 22 59.54 – U F51
2021-09-12 06:53:04 C 22 01 36.206 -12 23 03.17 – U F51
2021-09-12 07:08:52 C 22 01 35.581 -12 23 05.86 – U F51
2021-09-12 07:24:41 C 22 01 34.955 -12 23 08.56 – U F51
2021-09-12 07:40:29 C 22 01 34.319 -12 23 11.30 – U F51
2021-09-13 04:51:19 C 22 00 45.24 -12 26 46.8 – V G96
2021-09-13 04:58:16 C 22 00 45.00 -12 26 49.0 – V G96
2021-09-13 05:05:14 C 22 00 44.71 -12 26 50.2 – V G96
2021-09-13 05:12:11 C 22 00 44.48 -12 26 51.1 – V G96
2021-10-02 00:06:37 C 21 46 14.82 -13 26 49.0 – V W62
2021-10-02 00:26:15 C 21 46 14.31 -13 26 51.4 – V W62
2021-10-02 00:47:33 C 21 46 13.77 -13 26 53.2 – V W62
2022-07-03 00:27:57 C 00 01 59.76 +03 15 00.8 – q 215
2022-07-03 00:32:36 C 00 01 59.79 +03 15 01.2 – q 215
2022-07-03 00:36:19 C 00 01 59.79 +03 15 01.5 – q 215
2022-08-07 19:10:10 C 23 51 53.43 +03 07 19.8 – V D29
2022-08-07 19:30:32 C 23 51 52.89 +03 07 18.5 – V D29
2022-08-07 19:50:54 C 23 51 52.34 +03 07 16.4 – V D29
2022-08-22 17:01:18 C 23 40 52.481 +02 20 25.76 – V P07
2022-08-22 18:14:23 C 23 40 49.901 +02 20 12.84 – V P07
2022-08-22 19:17:54 C 23 40 47.515 +02 20 02.04 – V P07
2022-08-22 20:17:53 C 23 40 45.288 +02 19 51.71 – V P07
2022-08-23 02:00:50 C 23 40 33.10 +02 18 51.8 – V J43
2022-08-23 02:11:57 C 23 40 32.71 +02 18 49.8 – V J43
2022-08-23 02:23:02 C 23 40 32.29 +02 18 47.8 – V J43
2022-08-29 19:56:52 C 23 34 24.87 +01 49 08.7 – q 215
2022-08-29 20:00:35 C 23 34 24.67 +01 49 08.2 – q 215
2022-08-29 20:04:18 C 23 34 24.46 +01 49 07.2 – q 215
2022-09-02 17:11:53 C 23 30 38.17 +01 30 04.9 – V D29
2022-09-02 17:32:15 C 23 30 37.30 +01 30 00.6 – V D29
2022-09-02 17:52:36 C 23 30 36.46 +01 29 56.2 – V D29
2022-09-05 09:22:40 C 23 27 57.595 +01 16 14.99 – U F52
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)