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
2007-03-13 18:52:09 C 01 01 59.49 +13 15 43.4 – o A32
2007-03-13 18:52:31 C 01 01 59.10 +13 15 39.7 – o A77
2007-03-13 18:58:46 C 01 02 00.12 +13 15 53.8 – o A77
2007-03-13 19:00:55 C 01 02 00.48 +13 15 47.2 – o A77
2007-03-13 19:03:05 C 01 02 00.50 +13 15 55.0 – o A77
2007-03-13 19:04:09 C 01 02 00.50 +13 15 50.9 – o A77
2007-03-14 18:51:02 C 01 04 39.52 +13 29 30.8 – o A32
2007-03-14 18:54:36 C 01 04 39.87 +13 29 33.0 – o A32
2007-03-14 18:58:06 C 01 04 40.36 +13 29 35.7 – o A32
2007-03-17 18:59:31 C 01 12 57.84 +14 11 25.3 – o A77
2007-03-17 19:00:14 C 01 12 57.87 +14 11 30.0 – o A77
2007-03-17 19:01:20 C 01 12 58.26 +14 11 25.2 – o A77
2007-03-17 19:02:28 C 01 12 58.13 +14 11 31.7 – o A77
2007-03-18 10:06:50 C 01 14 46.25 +14 20 09.8 – m 349
2007-03-18 10:07:37 C 01 14 46.34 +14 20 10.5 – m 349
2007-04-06 18:50:17 C 02 20 52.24 +18 18 00.0 – r 235
2007-04-06 19:36:59 C 02 20 59.66 +18 18 12.7 – r 232
2007-04-06 19:40:17 C 02 21 00.20 +18 18 13.6 – r 232
2007-04-06 19:43:02 C 02 21 00.60 +18 18 13.7 – r 232
2007-04-14 10:02:02 C 02 48 14.29 +18 08 39.0 – m 349
2007-04-14 10:04:11 C 02 48 14.60 +18 08 38.1 – m 349
2007-05-27 18:24:21 C 00 34 36.64 -16 53 23.4 – m 349
2007-05-27 18:26:06 C 00 34 36.33 -16 53 24.8 – m 349
2007-06-15 17:53:50 C 23 26 07.68 -26 19 05.5 – m 349
2007-06-15 17:55:39 C 23 26 07.40 -26 19 07.6 – m 349
2007-06-15 17:57:27 C 23 26 07.08 -26 19 09.5 – m 349
2007-06-23 14:40:17 C 22 51 53.14 -29 44 49.9 – r 415
2007-06-23 14:45:33 C 22 51 52.09 -29 44 55.8 – r 415
2007-07-05 16:02:53 C 21 52 55.63 -33 38 02.5 – r 415
2007-07-05 16:09:07 C 21 52 54.33 -33 38 06.1 – r 415
2007-07-07 02:57:01 C 21 45 39.62 -33 56 50.9 – r 232
2007-07-07 02:59:53 C 21 45 39.01 -33 56 52.1 – r 232
2007-07-07 03:02:45 C 21 45 38.39 -33 56 52.9 – r 232
2007-07-11 17:24:00 C 21 23 05.775 -34 40 22.91 – r E12
2007-07-15 00:31:35 C 21 07 38.88 -34 58 21.3 – r 213
2007-07-15 00:32:50 C 21 07 38.63 -34 58 21.4 – r 213
2007-07-15 00:33:40 C 21 07 38.47 -34 58 21.6 – r 213
2007-07-15 02:23:20 C 21 07 17.37 -34 58 39.0 – r J53
2007-07-15 02:29:38 C 21 07 16.11 -34 58 39.3 – r J53
2007-07-15 02:30:46 C 21 07 15.87 -34 58 39.1 – r J53
2007-07-28 00:23:49 C 20 16 37.56 -34 40 49.5 – r 232
2007-07-28 00:40:21 C 20 16 35.28 -34 40 45.1 – r 232
2007-07-28 00:56:11 C 20 16 33.14 -34 40 40.8 – r 232
2007-08-03 11:02:24 C 19 58 15.43 -33 59 45.0 – r 423
2007-08-03 11:19:54 C 19 58 13.58 -33 59 39.8 – r 423
2007-08-03 11:43:47 C 19 58 11.04 -33 59 33.1 – r 423
2007-08-04 10:29:02 C 19 55 51.99 -33 52 37.1 – r 423
2007-08-04 11:02:51 C 19 55 48.52 -33 52 26.8 – r 423
2007-08-04 12:55:03 C 19 55 37.16 -33 51 53.3 – r E12
2007-08-04 13:06:10 C 19 55 35.94 -33 51 49.7 – r E12
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)