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
2023-09-05 11:58:53 C 06 44 47.07 +33 56 53.4 – V U94
2023-09-06 01:45:25 B 06 49 02.67 +33 53 24.6 – X G00
2023-09-06 01:48:57 B 06 49 03.86 +33 53 24.6 – X G00
2023-09-06 01:51:57 B 06 49 04.69 +33 53 23.5 – X G00
2023-09-06 02:59:14 C 06 49 25.546 +33 53 03.95 – X G19
2023-09-06 03:02:51 C 06 49 26.659 +33 53 03.08 – X G19
2023-09-06 03:06:28 C 06 49 27.984 +33 53 03.34 – X G19
2023-09-06 10:56:19 C 06 51 54.50 +33 50 46.7 – X U94
2023-09-06 11:00:11 C 06 51 55.68 +33 50 45.4 – X U94
2023-09-06 11:04:04 C 06 51 56.90 +33 50 44.6 – X U94
2023-09-07 01:07:40 C 06 56 22.886 +33 46 06.10 – V I81
2023-09-07 01:13:47 C 06 56 24.958 +33 46 05.88 – V I81
2023-09-07 01:19:54 C 06 56 26.818 +33 46 02.71 – V I81
2023-09-08 03:19:46 B 07 04 46.997 +33 35 49.63 – X K74
2023-09-08 03:23:20 B 07 04 48.197 +33 35 48.34 – X K74
2023-09-08 03:26:38 B 07 04 49.277 +33 35 47.65 – X K74
2023-09-09 18:28:41 C 07 17 39.75 +33 15 50.4 – m 349
2023-09-09 18:33:59 C 07 17 41.46 +33 15 47.0 – m 349
2023-09-10 01:37:10 C 07 20 02.95 +33 11 27.2 – Z G23
2023-09-10 01:47:25 C 07 20 06.58 +33 11 23.4 – Z G23
2023-09-10 01:56:38 C 07 20 09.91 +33 11 18.0 – Z G23
2023-09-10 03:40:12 C 07 20 44.136 +33 10 15.17 – V 970
2023-09-10 03:57:16 C 07 20 49.958 +33 10 04.51 – V 970
2023-09-11 03:25:57 C 07 28 46.57 +32 54 21.8 – q 215
2023-09-11 03:27:48 C 07 28 47.25 +32 54 20.2 – q 215
2023-09-11 03:29:40 C 07 28 47.76 +32 54 19.1 – q 215
2023-09-12 01:37:29 C 07 36 23.710 +32 37 23.52 – V I81
2023-09-12 01:41:22 C 07 36 25.40 +32 37 18.6 – Z G23
2023-09-12 01:41:36 C 07 36 25.145 +32 37 18.95 – V I81
2023-09-12 01:45:41 C 07 36 26.491 +32 37 15.60 – V I81
2023-09-12 01:51:37 C 07 36 28.89 +32 37 13.0 – Z G23
2023-09-12 02:00:52 C 07 36 32.12 +32 37 05.4 – Z G23
2023-09-12 17:19:45 C 07 41 50.68 +32 24 08.6 – q Q23
2023-09-12 17:30:37 C 07 41 54.45 +32 23 59.4 – q Q23
2023-09-13 01:57:25 C 07 44 51.545 +32 16 22.55 – V I81
2023-09-13 02:01:32 C 07 44 52.776 +32 16 16.93 – V I81
2023-09-13 02:05:38 C 07 44 54.202 +32 16 14.12 – V I81
2023-09-13 03:43:25 C 07 45 28.663 +32 14 46.68 – V Z10
2023-09-13 03:52:50 C 07 45 31.894 +32 14 37.93 – V Z10
2023-09-13 04:03:25 C 07 45 35.604 +32 14 28.50 – V Z10
2023-09-14 03:00:52 C 07 53 40.93 +31 52 02.0 – V C23
2023-09-14 03:08:25 C 07 53 43.43 +31 51 53.4 – V C23
2023-09-14 03:14:53 C 07 53 45.83 +31 51 47.8 – V C23
2023-09-14 03:20:09 C 07 53 47.722 +31 51 41.26 – Z 213
2023-09-14 03:45:14 C 07 53 56.669 +31 51 17.57 – Z 213
2023-09-14 04:09:47 C 07 54 05.206 +31 50 53.16 – Z 213
2023-09-15 04:05:00 C 08 02 36.04 +31 24 48.9 – – A77
2023-09-15 04:08:23 C 08 02 37.29 +31 24 45.3 – – A77
2023-09-15 04:11:49 C 08 02 38.54 +31 24 41.6 – – A77
2023-09-15 17:23:59 C 08 07 22.81 +31 09 10.1 – q 903
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)