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
2023-09-24 03:21:36 B 09 20 51.96 +25 29 24.2 – X M18
2023-09-24 03:24:02 B 09 20 53.01 +25 29 19.4 – X M18
2023-09-24 03:26:21 B 09 20 53.66 +25 29 14.2 – X M18
2023-09-24 03:29:11 C 09 20 54.59 +25 29 09.1 – q A77
2023-09-24 03:33:12 C 09 20 56.01 +25 29 00.7 – q A77
2023-09-24 03:38:32 C 09 20 57.92 +25 28 50.1 – q A77
2023-09-24 17:58:20 C 09 26 08.16 +24 57 41.6 – m 349
2023-09-24 18:01:15 C 09 26 09.23 +24 57 34.9 – m 349
2023-09-24 18:04:08 C 09 26 10.27 +24 57 28.7 – m 349
2023-09-25 03:11:40 C 09 29 27.09 +24 37 10.4 – q 215
2023-09-25 03:15:33 C 09 29 28.56 +24 37 03.8 – q 215
2023-09-25 03:19:39 C 09 29 30.01 +24 36 52.7 – q 215
2023-09-25 03:38:53 B 09 29 36.97 +24 36 10.3 – X M18
2023-09-25 03:45:56 B 09 29 39.57 +24 35 55.2 – X M18
2023-09-25 03:47:37 C 09 29 39.98 +24 35 51.4 – – A77
2023-09-25 03:53:06 B 09 29 42.27 +24 35 38.7 – X M18
2023-09-25 03:53:57 C 09 29 42.26 +24 35 37.3 – – A77
2023-09-25 04:00:38 C 09 29 44.62 +24 35 22.4 – – A77
2023-09-26 03:21:26 C 09 38 05.752 +23 41 54.51 – Z M09
2023-09-26 03:33:09 C 09 38 09.913 +23 41 27.43 – Z M09
2023-09-26 03:44:47 C 09 38 14.073 +23 41 00.18 – Z M09
2023-09-26 04:03:47 C 09 38 21.21 +23 40 21.2 – – A77
2023-09-26 04:06:08 C 09 38 21.78 +23 40 11.7 – – A77
2023-09-26 04:08:08 C 09 38 22.49 +23 40 06.6 – – A77
2023-09-26 04:19:44 C 09 38 26.68 +23 39 40.3 – X C95
2023-09-26 04:25:20 C 09 38 28.668 +23 39 27.18 – V Z10
2023-09-26 04:27:32 C 09 38 29.47 +23 39 21.8 – X C95
2023-09-26 04:34:40 C 09 38 31.980 +23 39 05.18 – V Z10
2023-09-26 04:35:47 C 09 38 32.39 +23 39 02.8 – X C95
2023-09-26 04:46:20 C 09 38 36.209 +23 38 37.93 – V Z10
2023-09-27 02:29:33 C 09 46 18.61 +22 46 56.2 – V C40
2023-09-27 02:30:29 C 09 46 18.70 +22 46 53.3 – V C40
2023-09-27 02:31:19 C 09 46 18.92 +22 46 51.6 – V C40
2023-09-27 03:16:00 C 09 46 34.956 +22 45 03.96 – V K40
2023-09-27 03:38:25 C 09 46 42.852 +22 44 08.66 – V K40
2023-09-27 11:53:07 C 09 49 37.46 +22 24 03.6 – V U94
2023-09-27 11:59:04 C 09 49 39.63 +22 23 50.1 – V U94
2023-09-27 12:00:45 C 09 49 40.24 +22 23 45.8 – V U94
2023-09-27 12:01:36 C 09 49 40.53 +22 23 43.8 – V U94
2023-09-28 01:25:21 C 09 54 22.67 +21 50 33.0 – V C40
2023-09-28 01:47:01 C 09 54 30.19 +21 49 39.3 – V C40
2023-09-28 02:08:39 C 09 54 37.78 +21 48 45.5 – V C40
2023-09-28 03:27:57 C 09 55 05.38 +21 45 26.2 – V C23
2023-09-28 03:36:34 C 09 55 08.49 +21 45 04.8 – V C23
2023-09-28 03:39:29 C 09 55 09.425 +21 44 57.39 – Z M09
2023-09-28 03:44:07 C 09 55 11.04 +21 44 45.2 – V C23
2023-09-28 03:53:43 C 09 55 14.393 +21 44 21.58 – Z M09
2023-09-28 04:07:50 C 09 55 19.340 +21 43 46.50 – Z M09
2023-09-28 04:39:29 C 09 55 30.502 +21 42 29.12 – Z 213
2023-09-28 04:45:02 C 09 55 32.479 +21 42 14.80 – Z 213
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)