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
2013-09-24 04:23:13 C 05 51 05.59 +41 41 03.0 – c I72
2013-09-25 01:27:00 C 05 57 44.91 +41 58 25.6 – q 160
2013-09-25 01:30:57 C 05 57 46.18 +41 58 28.7 – q 160
2013-09-25 01:34:55 C 05 57 47.46 +41 58 32.0 – q 160
2013-09-25 02:07:25 C 05 57 57.88 +41 58 58.5 – q 215
2013-09-25 02:09:16 C 05 57 58.47 +41 58 59.9 – q 215
2013-09-25 02:11:07 C 05 57 59.07 +41 59 01.4 – q 215
2013-09-25 02:36:10 C 05 58 07.46 +41 59 26.6 – d A77
2013-09-25 02:41:12 C 05 58 09.11 +41 59 28.2 – d A77
2013-09-25 02:47:25 C 05 58 10.97 +41 59 33.4 – d A77
2013-09-25 03:13:23 C 05 58 19.01 +41 59 55.3 – c A24
2013-09-25 03:13:45 C 05 58 19.17 +41 59 53.4 – c A24
2013-09-25 04:12:57 C 05 58 38.21 +42 00 41.9 – c A24
2013-09-25 07:40:49 C 05 59 47.16 +42 03 35.2 – q W96
2013-09-25 08:36:26 C 06 00 04.83 +42 04 25.5 – q W96
2013-09-26 03:14:49 C 06 06 17.86 +42 18 40.8 – c I72
2013-09-26 03:31:45 C 06 06 24.35 +42 18 56.4 – c I72
2013-09-26 03:57:09 C 06 06 32.15 +42 19 13.3 – c I72
2013-09-26 17:38:30 C 06 11 16.95 +42 29 22.9 – m 372
2013-09-26 17:49:30 C 06 11 20.77 +42 29 31.2 – m 372
2013-09-26 23:04:38 C 06 13 12.02 +42 33 08.1 – q D09
2013-09-26 23:16:07 C 06 13 16.21 +42 33 16.6 – q D09
2013-09-26 23:53:18 C 06 13 29.48 +42 33 47.7 – u C36
2013-09-26 23:57:54 C 06 13 30.97 +42 33 50.7 – u C36
2013-09-26 23:58:50 C 06 13 31.40 +42 33 49.6 – u C36
2013-09-27 02:18:55 C 06 14 21.00 +42 35 28.8 – q C23
2013-09-27 02:23:04 C 06 14 22.52 +42 35 32.9 – q C23
2013-09-27 02:27:14 C 06 14 23.85 +42 35 35.7 – q C23
2013-09-27 04:30:44 C 06 15 08.13 +42 37 05.5 – – 442
2013-09-27 04:32:43 C 06 15 08.85 +42 37 06.9 – – 442
2013-09-27 22:50:21 C 06 21 50.43 +42 49 09.4 – u 510
2013-09-27 22:56:40 C 06 21 52.78 +42 49 13.8 – u 510
2013-09-27 23:02:59 C 06 21 55.15 +42 49 18.1 – u 510
2013-09-27 23:09:19 C 06 21 57.51 +42 49 22.6 – u 510
2013-09-27 23:28:16 C 06 22 04.59 +42 49 35.3 – u 510
2013-09-27 23:34:16 C 06 22 06.84 +42 49 38.9 – u 510
2013-09-28 00:05:41 C 06 22 18.48 +42 49 58.7 – q D09
2013-09-28 00:18:09 C 06 22 23.19 +42 50 08.4 – q D09
2013-09-28 00:30:39 C 06 22 27.70 +42 50 15.7 – q D09
2013-09-28 04:02:21 C 06 23 46.58 +42 52 31.9 – t A21
2013-09-28 04:10:53 C 06 23 49.79 +42 52 37.4 – t A21
2013-09-28 04:17:17 C 06 23 52.24 +42 52 41.1 – t A21
2013-09-28 05:03:38 C 06 24 10.05 +42 53 15.4 – c J24
2013-09-28 05:05:47 C 06 24 10.84 +42 53 16.3 – c J24
2013-09-28 05:08:49 C 06 24 11.94 +42 53 18.6 – c J24
2013-09-29 00:33:26 C 06 31 40.23 +43 04 29.6 – q C47
2013-09-29 00:38:13 C 06 31 42.03 +43 04 32.2 – q C47
2013-09-29 00:45:39 C 06 31 44.96 +43 04 36.2 – q C47
2013-09-29 02:51:38 C 06 32 34.29 +43 05 46.0 – c B96
2013-09-29 02:55:01 C 06 32 36.07 +43 05 50.0 – c B96
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)