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
2019-11-10 06:40:22 C 22 52 56.466 +00 18 26.65 – U F52
2019-11-10 06:59:00 C 22 52 56.094 +00 18 23.91 – U F52
2019-11-10 07:17:41 C 22 52 55.712 +00 18 20.44 – U F52
2019-11-10 07:36:21 C 22 52 55.325 +00 18 17.41 – U F52
2019-11-28 12:35:47 C 22 48 49.43 -00 30 16.6 – q Q11
2019-11-28 12:52:56 C 22 48 49.43 -00 30 16.9 – q Q11
2019-11-29 11:11:18 C 22 48 50.55 -00 31 23.2 – q Q11
2019-11-29 11:24:14 C 22 48 50.56 -00 31 23.6 – q Q11
2019-11-30 11:11:10 C 22 48 53.09 -00 32 24.8 – q Q11
2019-11-30 11:24:08 C 22 48 53.12 -00 32 25.5 – q Q11
2019-12-02 10:57:59 C 22 49 02.47 -00 34 01.6 – q Q11
2019-12-02 11:15:02 C 22 49 02.51 -00 34 02.2 – q Q11
2019-12-28 09:11:34 C 22 58 51.96 -00 02 47.1 – q Q11
2019-12-28 09:24:34 C 22 58 52.32 -00 02 46.0 – q Q11
2019-12-28 20:36:17 C 22 59 10.05 -00 01 21.3 – V G40
2019-12-28 21:00:52 C 22 59 10.63 -00 01 18.2 – V G40
2020-01-22 17:49:33 C 23 19 55.19 +01 51 13.2 – q A77
2020-01-22 18:08:04 C 23 19 56.01 +01 51 18.5 – q A77
2020-01-22 18:26:35 C 23 19 56.14 +01 51 25.7 – q A77
2020-07-07 08:32:27 C 08 48 44.35 +12 00 01.3 – V Q38
2020-07-07 08:33:04 C 08 48 44.57 +11 59 59.8 – V Q38
2020-07-07 08:36:44 C 08 48 45.56 +11 59 49.2 – V Q38
2020-07-07 08:37:58 C 08 48 46.01 +11 59 47.5 – V Q38
2020-07-13 23:09:48 C 09 35 05.58 +05 05 36.7 – V W88
2020-07-13 23:11:09 C 09 35 05.93 +05 05 33.1 – V W88
2020-07-13 23:12:27 C 09 35 06.36 +05 05 30.0 – V W88
2020-07-13 23:19:52 C 09 35 08.57 +05 05 09.0 – V W88
2020-07-13 23:21:10 C 09 35 08.96 +05 05 04.3 – V W88
2020-07-13 23:22:29 C 09 35 09.37 +05 05 01.0 – V W88
2020-07-13 23:29:50 C 09 35 11.62 +05 04 39.9 – V W88
2020-07-13 23:31:10 C 09 35 11.99 +05 04 37.1 – V W88
2020-07-13 23:32:27 C 09 35 12.36 +05 04 32.8 – V W88
2020-07-14 08:56:49 C 09 38 04.08 +04 37 58.2 – V Q38
2020-07-14 08:57:26 C 09 38 04.13 +04 37 56.0 – V Q38
2020-07-14 08:59:17 C 09 38 04.77 +04 37 51.2 – V Q38
2020-07-14 08:59:55 C 09 38 04.95 +04 37 48.7 – V Q38
2020-07-17 08:48:02 C 10 00 28.80 +01 07 21.1 – V Q38
2020-07-17 08:49:18 C 10 00 28.87 +01 07 17.3 – V Q38
2020-07-17 08:50:35 C 10 00 29.29 +01 07 13.8 – V Q38
2020-07-17 08:53:08 C 10 00 30.33 +01 07 06.9 – V Q38
2020-07-17 08:54:25 C 10 00 30.67 +01 07 03.4 – V Q38
2020-07-17 21:22:52 C 10 04 30.86 +00 29 07.5 – q Y00
2020-07-17 21:33:30 C 10 04 34.10 +00 28 34.8 – q Y00
2020-07-17 21:44:11 C 10 04 37.55 +00 28 02.5 – q Y00
2020-08-01 23:07:51 C 12 16 25.60 -18 18 18.7 – q Y00
2020-08-01 23:19:14 C 12 16 30.04 -18 18 49.5 – q Y00
2020-08-01 23:29:59 C 12 16 34.25 -18 19 21.0 – q Y00
2020-08-02 23:16:03 C 12 25 52.95 -19 23 22.4 – q Y00
2020-08-02 23:28:08 C 12 25 57.59 -19 23 53.0 – q Y00
2020-08-02 23:39:14 C 12 26 01.90 -19 24 25.3 – q Y00
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)