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
2013-09-14 02:42:29 C 04 51 37.36 +37 58 03.5 – r 106
2013-09-14 02:43:22 C 04 51 37.54 +37 58 04.2 – r 106
2013-09-14 02:44:00 C 04 51 37.74 +37 58 04.8 – q 511
2013-09-14 02:44:14 C 04 51 37.72 +37 58 05.2 – r 106
2013-09-14 02:45:07 C 04 51 37.86 +37 58 05.8 – r 106
2013-09-14 02:46:00 C 04 51 38.02 +37 58 06.7 – r 106
2013-09-14 02:46:52 C 04 51 38.22 +37 58 07.5 – r 106
2013-09-14 02:47:45 C 04 51 38.38 +37 58 08.4 – r 106
2013-09-14 02:48:38 C 04 51 38.56 +37 58 09.4 – r 106
2013-09-14 02:49:31 C 04 51 38.73 +37 58 10.1 – r 106
2013-09-14 02:50:23 C 04 51 38.87 +37 58 10.7 – r 106
2013-09-14 02:51:16 C 04 51 39.05 +37 58 12.0 – r 106
2013-09-14 02:52:09 C 04 51 39.22 +37 58 12.6 – r 106
2013-09-14 02:53:01 C 04 51 39.38 +37 58 13.3 – r 106
2013-09-14 02:53:54 C 04 51 39.54 +37 58 14.1 – r 106
2013-09-14 02:54:47 C 04 51 39.74 +37 58 15.1 – r 106
2013-09-14 03:29:04 C 04 51 46.35 +37 58 46.7 – w I72
2013-09-14 03:37:17 C 04 51 48.34 +37 58 56.2 – w I72
2013-09-14 08:50:56 C 04 52 49.87 +38 03 48.3 – q H45
2013-09-14 08:52:57 C 04 52 50.23 +38 03 49.7 – q H45
2013-09-14 08:54:55 C 04 52 50.63 +38 03 51.7 – q H45
2013-09-14 08:59:03 C 04 52 51.41 +38 03 55.7 – q H45
2013-09-14 09:02:05 C 04 52 52.00 +38 03 58.5 – q H45
2013-09-14 09:04:04 C 04 52 52.42 +38 04 00.4 – q H45
2013-09-14 09:05:34 C 04 52 52.68 +38 04 02.0 – q H45
2013-09-14 09:07:48 C 04 52 53.12 +38 04 04.0 – q H45
2013-09-14 11:59:28 C 04 53 26.80 +38 06 45.8 – o 291
2013-09-14 12:01:12 C 04 53 27.14 +38 06 47.4 – o 291
2013-09-14 12:02:57 C 04 53 27.48 +38 06 49.0 – o 291
2013-09-15 02:15:00 C 04 56 19.00 +38 20 03.0 – w I72
2013-09-15 02:23:16 C 04 56 20.48 +38 20 10.3 – w I72
2013-09-15 02:31:32 C 04 56 22.35 +38 20 19.2 – w I72
2013-09-15 04:07:59 C 04 56 41.56 +38 21 48.9 – q C23
2013-09-15 04:11:04 C 04 56 42.05 +38 21 51.1 – q C23
2013-09-15 04:14:08 C 04 56 42.81 +38 21 54.4 – q C23
2013-09-15 08:47:49 C 04 57 39.13 +38 26 12.5 – q H45
2013-09-15 08:49:58 C 04 57 39.58 +38 26 14.8 – q H45
2013-09-15 08:53:16 C 04 57 40.20 +38 26 17.9 – q H45
2013-09-15 08:55:03 C 04 57 40.60 +38 26 19.7 – q H45
2013-09-15 08:57:50 C 04 57 41.19 +38 26 22.2 – q H45
2013-09-15 08:59:44 C 04 57 41.56 +38 26 24.0 – q H45
2013-09-15 09:03:02 C 04 57 42.19 +38 26 27.3 – q H45
2013-09-15 09:06:42 C 04 57 42.97 +38 26 30.7 – q H45
2013-09-15 10:11:08 C 04 57 56.06 +38 27 32.2 – t H47
2013-09-15 10:27:02 C 04 57 59.29 +38 27 47.4 – t H47
2013-09-15 10:27:05 C 04 57 59.54 +38 27 47.1 – o 291
2013-09-15 10:27:54 C 04 57 59.48 +38 27 48.2 – t H47
2013-09-15 10:30:04 C 04 58 00.13 +38 27 49.9 – o 291
2013-09-15 10:33:04 C 04 58 00.75 +38 27 52.7 – o 291
2013-09-16 02:44:31 C 05 01 23.95 +38 43 04.3 – q 511
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)