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
2006-11-19 02:54:21 C 22 58 58.83 +03 22 20.7 – r 703
2006-11-19 19:22:44 C 22 58 40.15 +03 18 51.3 – r 213
2006-11-19 19:36:13 C 22 58 39.89 +03 18 48.3 – r 213
2006-11-19 19:46:18 C 22 58 39.71 +03 18 45.7 – r 213
2006-12-13 18:53:09 C 22 57 25.46 +02 17 07.0 – r 215
2006-12-24 19:00:59 C 23 02 29.91 +02 26 40.9 – c 473
2006-12-24 19:07:01 C 23 02 30.12 +02 26 40.8 – c 473
2006-12-24 19:17:48 C 23 02 30.36 +02 26 42.6 – c 473
2007-01-01 19:11:51 C 23 08 06.41 +02 47 33.3 – o J70
2007-01-01 19:17:06 C 23 08 06.84 +02 47 25.9 – o J70
2007-01-09 09:59:44 – 23 14 47.90 +03 17 37.1 – – 372
2007-01-13 17:42:08 C 23 19 09.60 +03 38 57.2 – r 215
2007-02-11 09:50:19 C 23 58 05.32 +07 15 01.5 – m 349
2007-02-11 09:52:41 C 23 58 05.49 +07 15 02.9 – m 349
2007-02-11 17:59:55 C 23 58 39.71 +07 18 22.2 – r 235
2007-02-15 18:42:52 C 00 05 37.42 +07 58 56.8 – r 215
2007-02-15 18:43:52 C 00 05 37.43 +07 58 57.1 – r 215
2007-02-15 18:44:53 C 00 05 37.47 +07 58 57.6 – r 215
2007-02-16 18:22:29 C 00 07 23.24 +08 09 14.2 – r 235
2007-02-16 18:47:57 C 00 07 25.24 +08 09 28.9 – o A77
2007-02-16 18:56:13 C 00 07 25.96 +08 09 29.6 – o A77
2007-02-16 18:59:41 C 00 07 26.05 +08 09 31.8 – o A77
2007-02-16 19:03:49 C 00 07 26.19 +08 09 31.7 – o A77
2007-02-16 19:09:41 C 00 07 27.00 +08 09 33.3 – o A77
2007-02-16 19:20:45 C 00 07 27.13 +08 09 39.3 – o A77
2007-02-18 09:47:55 C 00 10 22.83 +08 26 43.6 – m 349
2007-02-18 09:50:17 C 00 10 22.95 +08 26 46.1 – m 349
2007-02-18 18:05:13 C 00 11 01.40 +08 30 26.6 – r 215
2007-02-19 18:44:57 C 00 12 56.38 +08 41 38.5 – c 213
2007-02-19 18:46:19 C 00 12 56.48 +08 41 39.0 – c 213
2007-02-19 18:49:03 C 00 12 56.70 +08 41 38.2 – c 213
2007-02-25 11:10:44 C 00 24 05.03 +09 46 17.8 – o D35
2007-02-25 11:14:38 C 00 24 05.38 +09 46 19.1 – o D35
2007-02-25 11:22:43 C 00 24 05.97 +09 46 22.3 – o D35
2007-02-25 11:26:55 C 00 24 06.38 +09 46 25.2 – o D35
2007-03-10 19:05:43 C 00 54 16.59 +12 35 01.0 – r 232
2007-03-10 19:09:27 C 00 54 16.96 +12 35 04.9 – r 232
2007-03-10 19:13:03 C 00 54 17.30 +12 35 06.7 – r 232
2007-03-11 09:53:52 C 00 55 50.00 +12 43 21.2 – m 349
2007-03-11 10:04:34 C 00 55 51.07 +12 43 27.7 – m 349
2007-03-11 10:14:37 C 00 55 52.22 +12 43 32.4 – m 349
2007-03-11 18:53:04 C 00 56 47.34 +12 48 26.2 – r A18
2007-03-12 18:59:54 C 00 59 22.94 +13 02 07.5 – r A18
2007-03-12 19:03:02 C 00 59 23.28 +13 02 06.9 – o A32
2007-03-12 19:16:52 C 00 59 24.71 +13 02 15.0 – o A32
2007-03-13 18:42:27 C 01 01 58.34 +13 15 38.1 – o A32
2007-03-13 18:47:45 C 01 01 58.93 +13 15 41.1 – o A32
2007-03-13 18:48:21 C 01 01 58.92 +13 15 42.6 – o A77
2007-03-13 18:48:55 C 01 01 58.80 +13 15 45.1 – o A77
2007-03-13 18:49:51 C 01 01 58.91 +13 15 41.9 – o A77
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)