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
2017-02-07 18:44:52 C 23 47 07.90 +07 03 25.2 – q A77
2017-02-07 18:54:25 C 23 47 08.58 +07 03 28.0 – U A77
2017-02-07 19:56:01 C 23 47 12.44 +07 03 43.2 – q G40
2017-02-07 19:58:28 C 23 47 12.61 +07 03 44.0 – q G40
2017-02-08 18:32:29 C 23 48 38.24 +07 08 44.3 – q I81
2017-02-08 18:43:12 C 23 48 39.03 +07 08 45.8 – q I81
2017-02-08 18:49:20 C 23 48 39.31 +07 08 48.6 – q I81
2017-02-09 16:19:57 C 23 50 01.06 +07 13 23.0 – q 585
2017-02-09 16:20:59 C 23 50 01.11 +07 13 24.2 – q 585
2017-02-09 16:24:02 C 23 50 01.33 +07 13 24.0 – q 585
2017-02-09 16:25:03 C 23 50 01.39 +07 13 24.3 – q 585
2017-02-09 16:26:04 C 23 50 01.44 +07 13 25.0 – q 585
2017-02-09 16:27:06 C 23 50 01.51 +07 13 24.8 – q 585
2017-02-09 16:28:06 C 23 50 01.59 +07 13 24.9 – q 585
2017-02-09 16:30:09 C 23 50 01.72 +07 13 25.6 – q 585
2017-02-09 16:31:10 C 23 50 01.75 +07 13 26.3 – q 585
2017-02-09 16:32:12 C 23 50 01.85 +07 13 25.3 – q 585
2017-02-09 16:33:12 C 23 50 01.91 +07 13 25.1 – q 585
2017-02-09 16:34:14 C 23 50 01.97 +07 13 25.6 – q 585
2017-02-10 18:46:55 C 23 51 41.09 +07 18 45.0 – q B92
2017-02-10 18:50:10 C 23 51 41.24 +07 18 46.0 – q B92
2017-02-10 18:54:30 C 23 51 41.55 +07 18 46.6 – q B92
2017-02-10 18:57:44 C 23 51 41.72 +07 18 47.6 – q B92
2017-02-11 09:40:34 C 23 52 37.10 +07 21 35.6 – m 349
2017-02-11 09:47:28 C 23 52 37.52 +07 21 36.8 – m 349
2017-02-11 10:02:53 C 23 52 38.49 +07 21 39.6 – m 349
2017-02-11 10:09:47 C 23 52 38.92 +07 21 40.9 – m 349
2017-02-11 18:44:02 C 23 53 11.21 +07 23 14.3 – q I81
2017-02-11 18:46:07 C 23 53 11.38 +07 23 14.3 – q I81
2017-02-11 18:48:13 C 23 53 11.56 +07 23 15.1 – q I81
2017-02-12 17:56:55 C 23 54 38.00 +07 27 11.0 – q C23
2017-02-12 18:22:20 C 23 54 39.49 +07 27 15.7 – q C23
2017-02-12 18:41:44 C 23 54 40.74 +07 27 18.2 – q C23
2017-02-13 17:48:11 C 23 56 06.05 +07 30 50.3 – q C23
2017-02-13 18:04:21 C 23 56 07.03 +07 30 51.9 – q C23
2017-02-13 18:19:27 C 23 56 07.94 +07 30 54.8 – q C23
2017-02-13 18:40:26 C 23 56 09.23 +07 30 56.1 – q I81
2017-02-13 18:43:35 C 23 56 09.46 +07 30 57.2 – q I81
2017-02-13 19:16:55 C 23 56 11.35 +07 31 02.9 – q I81
2017-02-13 20:03:40 C 23 56 14.21 +07 31 10.4 – q G40
2017-02-13 20:11:38 C 23 56 14.70 +07 31 11.4 – q G40
2017-02-13 20:23:33 C 23 56 15.42 +07 31 14.5 – q J22
2017-02-13 20:27:11 C 23 56 15.69 +07 31 13.4 – q J22
2017-02-13 20:30:46 C 23 56 15.86 +07 31 13.3 – q J22
2017-02-15 17:37:26 C 23 58 58.15 +07 36 18.7 – q 585
2017-02-15 17:38:27 C 23 58 58.24 +07 36 19.6 – q 585
2017-02-15 17:41:30 C 23 58 58.38 +07 36 20.0 – q 585
2017-02-15 17:43:32 C 23 58 58.54 +07 36 20.3 – q 585
2017-02-15 17:44:33 C 23 58 58.56 +07 36 20.3 – q 585
2017-02-15 17:46:36 C 23 58 58.69 +07 36 20.8 – q 585
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)