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
2016-09-08 23:54:56 C 00 53 25.22 +16 14 38.6 – Q B96
2016-09-08 23:57:21 C 00 53 25.11 +16 14 39.0 – Q B96
2016-09-08 23:59:43 C 00 53 25.01 +16 14 38.8 – Q B96
2016-09-09 00:02:07 C 00 53 24.92 +16 14 38.6 – Q B96
2016-09-09 00:04:31 C 00 53 24.80 +16 14 38.1 – Q B96
2016-09-09 00:46:39 C 00 53 22.66 +16 14 36.8 – v A77
2016-09-09 02:09:14 C 00 53 18.58 +16 14 32.2 – v A77
2016-09-09 19:36:20 C 00 52 27.21 +16 13 30.1 – q C42
2016-09-09 20:10:14 C 00 52 25.49 +16 13 27.5 – q C42
2016-09-09 20:18:11 C 00 52 25.10 +16 13 27.0 – q C42
2016-09-11 07:11:28 C 00 50 38.64 +16 10 59.5 – q 703
2016-09-11 07:20:08 C 00 50 38.17 +16 10 59.5 – q 703
2016-09-11 07:28:48 C 00 50 37.73 +16 11 00.2 – q 703
2016-09-11 07:37:26 C 00 50 37.18 +16 10 58.5 – q 703
2016-09-12 02:49:53 C 00 49 36.26 +16 09 22.4 – v A77
2016-09-12 03:17:22 C 00 49 34.73 +16 09 19.8 – v A77
2016-09-12 03:42:57 C 00 49 33.35 +16 09 17.6 – v A77
2016-09-12 21:26:59 C 00 48 36.47 +16 07 40.2 – q K41
2016-09-12 21:40:30 C 00 48 35.62 +16 07 40.1 – q K41
2016-09-12 21:51:08 C 00 48 35.07 +16 07 37.5 – q K41
2016-09-20 22:12:34 C 00 36 56.58 +15 40 49.2 – q I81
2016-09-20 22:20:46 C 00 36 56.06 +15 40 47.6 – q I81
2016-09-20 22:31:04 C 00 36 55.36 +15 40 45.8 – q I81
2016-09-21 16:47:16 C 00 35 42.08 +15 37 20.0 – q D29
2016-09-21 17:07:38 C 00 35 40.66 +15 37 15.9 – q D29
2016-09-21 17:28:00 C 00 35 39.27 +15 37 12.1 – q D29
2016-09-22 03:21:14 C 00 34 58.95 +15 35 13.2 – q A77
2016-09-22 03:30:10 C 00 34 58.34 +15 35 11.5 – q A77
2016-09-22 03:39:07 C 00 34 57.74 +15 35 09.5 – q A77
2016-09-23 22:04:23 C 00 32 02.42 +15 26 12.5 – q C23
2016-09-23 22:16:52 C 00 32 01.48 +15 26 09.9 – q C23
2016-09-23 22:31:24 C 00 32 00.48 +15 26 06.9 – q C23
2016-09-24 21:07:59 C 00 30 24.60 +15 20 58.7 – q C23
2016-09-24 21:16:18 C 00 30 24.00 +15 20 56.6 – q C23
2016-09-24 21:28:46 C 00 30 23.06 +15 20 53.6 – q C23
2016-09-25 00:32:45 C 00 30 09.66 +15 20 10.5 – q 585
2016-09-25 00:33:46 C 00 30 09.57 +15 20 10.5 – q 585
2016-09-25 00:34:48 C 00 30 09.49 +15 20 10.6 – q 585
2016-09-25 00:35:49 C 00 30 09.41 +15 20 10.4 – q 585
2016-09-25 00:36:50 C 00 30 09.35 +15 20 10.2 – q 585
2016-09-25 00:37:52 C 00 30 09.28 +15 20 09.9 – q 585
2016-09-25 00:38:52 C 00 30 09.20 +15 20 09.7 – q 585
2016-09-25 00:39:54 C 00 30 09.13 +15 20 09.6 – q 585
2016-09-25 00:40:55 C 00 30 09.06 +15 20 09.2 – q 585
2016-09-25 00:41:56 C 00 30 08.99 +15 20 09.2 – q 585
2016-09-25 00:42:58 C 00 30 08.93 +15 20 08.7 – q 585
2016-09-25 21:42:30 C 00 28 38.46 +15 15 04.3 – q I81
2016-09-25 21:52:44 C 00 28 37.70 +15 15 02.0 – q I81
2016-09-25 22:00:55 C 00 28 37.08 +15 15 00.4 – q I81
2016-09-25 23:04:31 C 00 28 32.41 +15 14 45.5 – S C47
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)