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
2013-10-28 04:58:06 C 12 07 36.12 +15 26 19.4 – d A77
2013-10-28 05:19:07 C 12 07 43.02 +15 24 50.9 – w I72
2013-10-28 05:21:41 C 12 07 43.81 +15 24 39.1 – w I72
2013-10-28 05:24:16 C 12 07 44.61 +15 24 29.0 – w I72
2013-10-28 19:18:50 C 12 12 13.80 +14 26 37.9 – q D95
2013-10-28 19:19:56 C 12 12 14.16 +14 26 33.2 – q D95
2013-10-28 19:20:29 C 12 12 14.34 +14 26 31.1 – q D95
2013-10-29 02:56:21 C 12 14 38.30 +13 55 07.8 – r 585
2013-10-29 02:57:22 C 12 14 38.61 +13 55 04.2 – r 585
2013-10-29 02:58:26 C 12 14 38.92 +13 54 59.1 – r 585
2013-10-29 03:00:34 C 12 14 39.64 +13 54 50.1 – r 585
2013-10-29 03:01:36 C 12 14 39.90 +13 54 46.9 – r 585
2013-10-29 03:02:39 C 12 14 40.29 +13 54 42.1 – r 585
2013-10-29 03:03:41 C 12 14 40.55 +13 54 37.9 – r 585
2013-10-29 03:04:45 C 12 14 40.93 +13 54 33.5 – r 585
2013-10-29 03:20:47 C 12 14 46.07 +13 53 28.7 – q A71
2013-10-29 03:22:25 C 12 14 46.60 +13 53 20.9 – q A71
2013-10-29 03:24:01 C 12 14 47.15 +13 53 13.9 – q A71
2013-10-29 03:25:37 C 12 14 47.60 +13 53 06.8 – q A71
2013-10-29 03:27:14 C 12 14 48.12 +13 53 00.3 – q A71
2013-10-29 03:28:50 C 12 14 48.69 +13 52 53.4 – q A71
2013-10-29 03:30:28 C 12 14 49.20 +13 52 46.5 – q A71
2013-10-29 05:16:27 C 12 15 22.44 +13 45 32.0 – w I72
2013-10-29 05:17:45 C 12 15 22.90 +13 45 28.9 – w I72
2013-10-29 05:19:03 C 12 15 23.28 +13 45 22.7 – w I72
2013-10-30 03:59:31 C 12 22 20.13 +12 13 15.1 – q C23
2013-10-30 03:59:38 C 12 22 20.10 +12 13 17.3 – q C10
2013-10-30 04:11:13 C 12 22 23.59 +12 12 29.1 – q C10
2013-10-30 04:16:17 C 12 22 25.06 +12 12 08.8 – q C23
2013-10-30 04:22:36 C 12 22 27.02 +12 11 45.2 – q C10
2013-10-30 04:28:45 C 12 22 28.78 +12 11 19.0 – q C23
2013-10-30 04:34:37 C 12 22 30.52 +12 10 56.4 – q C10
2013-10-31 04:10:19 C 12 29 27.08 +10 37 12.6 – q C23
2013-10-31 04:18:57 C 12 29 29.53 +10 36 39.5 – q C23
2013-10-31 04:19:51 C 12 29 30.08 +10 36 34.7 – q B92
2013-10-31 04:23:33 C 12 29 31.13 +10 36 21.1 – q B92
2013-10-31 04:27:14 C 12 29 32.20 +10 36 06.6 – q B92
2013-10-31 04:30:49 C 12 29 32.98 +10 35 51.9 – q C23
2013-10-31 04:49:58 C 12 29 38.52 +10 34 40.6 – w I57
2013-10-31 04:50:59 C 12 29 38.88 +10 34 36.6 – w I57
2013-10-31 04:51:23 C 12 29 39.09 +10 34 35.0 – w I57
2013-10-31 04:59:07 C 12 29 41.35 +10 34 02.6 – w I72
2013-10-31 05:00:28 C 12 29 41.69 +10 33 57.9 – w I72
2013-10-31 05:01:48 C 12 29 42.04 +10 33 53.1 – w I72
2013-10-31 05:35:18 C 12 29 51.66 +10 31 41.8 – c J38
2013-10-31 05:36:07 C 12 29 51.86 +10 31 39.4 – c J38
2013-10-31 05:36:32 C 12 29 51.92 +10 31 37.7 – c J38
2013-10-31 12:05:48 C 12 31 43.46 +10 06 17.0 – t H06
2013-10-31 12:07:44 C 12 31 44.08 +10 06 11.0 – t H06
2013-10-31 12:09:42 C 12 31 44.62 +10 06 02.1 – t H06
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)