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
2013-10-11 04:45:10 C 08 57 00.16 +40 42 12.9 – q 987
2013-10-11 05:01:48 C 08 57 09.47 +40 41 43.2 – q 987
2013-10-11 05:04:58 C 08 57 11.15 +40 41 35.2 – q 987
2013-10-11 11:08:05 C 09 00 37.39 +40 29 20.8 – q G68
2013-10-11 11:18:24 C 09 00 43.22 +40 29 00.1 – q G68
2013-10-11 11:28:26 C 09 00 48.78 +40 28 39.5 – q G68
2013-10-11 11:38:04 C 09 00 54.29 +40 28 20.0 – q G68
2013-10-11 11:48:04 C 09 00 59.80 +40 28 00.0 – q G68
2013-10-11 18:27:30 C 09 04 46.52 +40 13 55.1 – m 372
2013-10-11 18:34:50 C 09 04 50.64 +40 13 39.5 – m 372
2013-10-12 01:41:00 C 09 08 52.79 +39 57 55.2 – u 958
2013-10-12 01:58:41 C 09 09 02.59 +39 57 15.8 – u 958
2013-10-12 02:05:27 C 09 09 06.22 +39 57 01.1 – q C23
2013-10-12 03:02:17 C 09 09 38.30 +39 54 54.6 – w I72
2013-10-12 03:04:34 C 09 09 39.60 +39 54 49.5 – w I72
2013-10-12 03:06:52 C 09 09 40.86 +39 54 44.2 – w I72
2013-10-12 03:20:19 C 09 09 48.44 +39 54 13.7 – q C23
2013-10-12 03:34:32 C 09 09 56.43 +39 53 41.9 – q C23
2013-10-12 05:03:51 C 09 10 47.14 +39 50 23.5 – q G40
2013-10-12 05:04:47 C 09 10 47.75 +39 50 21.3 – q G40
2013-10-12 10:21:12 C 09 13 46.68 +39 37 57.3 – u G30
2013-10-12 10:23:23 C 09 13 47.82 +39 37 55.2 – u G30
2013-10-12 10:26:00 C 09 13 49.07 +39 37 55.8 – u G30
2013-10-13 00:14:41 C 09 21 37.35 +39 04 02.5 – q A71
2013-10-13 00:25:57 C 09 21 43.61 +39 03 32.9 – q A71
2013-10-13 03:26:10 C 09 23 25.19 +38 55 58.1 – w I72
2013-10-13 03:27:20 C 09 23 25.78 +38 55 54.8 – w I72
2013-10-13 03:30:48 C 09 23 27.71 +38 55 46.5 – w I72
2013-10-13 17:58:57 C 09 31 34.68 +38 17 20.3 – q D95
2013-10-13 18:01:47 C 09 31 36.20 +38 17 12.4 – q D95
2013-10-13 18:03:29 C 09 31 37.26 +38 17 09.2 – m 372
2013-10-13 18:06:51 C 09 31 39.08 +38 16 58.7 – q D95
2013-10-13 18:14:30 C 09 31 43.37 +38 16 39.3 – m 372
2013-10-13 18:26:15 C 09 31 49.92 +38 16 07.5 – m 372
2013-10-13 19:59:30 C 09 32 42.04 +38 11 52.4 – u 367
2013-10-13 20:01:14 C 09 32 42.99 +38 11 47.7 – u 367
2013-10-13 20:03:00 C 09 32 43.97 +38 11 42.9 – u 367
2013-10-14 03:31:43 C 09 36 54.05 +37 50 34.5 – w I72
2013-10-14 03:32:49 C 09 36 54.65 +37 50 31.3 – w I72
2013-10-14 03:36:11 C 09 36 56.45 +37 50 22.3 – w I72
2013-10-14 04:39:06 C 09 37 31.43 +37 47 23.6 – – 442
2013-10-14 04:45:39 C 09 37 34.88 +37 47 05.0 – – 442
2013-10-14 05:09:29 C 09 37 48.74 +37 45 58.4 – q G40
2013-10-14 05:10:37 C 09 37 49.39 +37 45 55.3 – q G40
2013-10-15 03:18:46 C 09 50 01.04 +36 39 19.0 – q G40
2013-10-15 03:19:54 C 09 50 01.63 +36 39 15.7 – q G40
2013-10-15 05:09:10 C 09 51 01.31 +36 33 37.2 – q G40
2013-10-15 05:10:19 C 09 51 01.69 +36 33 34.2 – q G40
2013-10-16 02:55:06 C 10 02 46.16 +35 22 23.0 – w I72
2013-10-16 02:57:19 C 10 02 47.52 +35 22 16.3 – w I72
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)