IAA RAS IAA Minor Planet Database

137199 (1999 KX4)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2926061927 ± 3.63e-09
Semi-major axis (a)1.4573678721 AU ± 2.80e-10
Inclination (i)16.56957845° ± 6.22e-07
Long. of Asc. Node (Ω)104.87771298° ± 1.73e-06
Arg. of Perihelion (ω)76.49995727° ± 2.19e-06
Mean Anomaly (M)75.83993705° ± 9.92e-07
Mean Motion (n)0.5602198454°/day ± 1.61e-10
Perihelion dist (q)1.03093301 AU ± 5.29e-09
Aphelion dist (Q)1.88380274 AU ± 5.30e-09
Orbital Period1.75935624 yr ± 5.06e-10
Physical Parameters
H (abs. magnitude)16.97
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.196″
Uncertainty0
Orbit TypeAmor
MOID0.190752 AU
Observations Used3481
Radar Obs Used1
Gaia Obs Used105
Oppositions16
Arc Total1978-2015
First Observation Used1978-08-10
Last Observation Used2025-02-03
Observations (4268)
Date Type RA Dec Mag Band Observatory
2020-05-15 10:25:51 C 15 18 10.22 +56 16 09.1 – V T05
2020-05-16 03:38:43 C 15 18 05.61 +55 29 47.0 – u H21
2020-05-16 03:40:41 C 15 18 05.60 +55 29 41.9 – u H21
2020-05-16 03:42:39 C 15 18 05.56 +55 29 36.9 – u H21
2020-05-16 03:44:36 C 15 18 05.54 +55 29 31.7 – u H21
2020-05-16 03:46:33 C 15 18 05.50 +55 29 26.4 – u H21
2020-05-16 03:48:30 C 15 18 05.43 +55 29 21.1 – u H21
2020-05-16 03:50:27 C 15 18 05.42 +55 29 16.1 – u H21
2020-05-16 03:52:24 C 15 18 05.39 +55 29 10.8 – u H21
2020-05-16 03:54:21 C 15 18 05.33 +55 29 05.6 – u H21
2020-05-16 03:56:19 C 15 18 05.33 +55 29 00.2 – u H21
2020-05-16 03:58:16 C 15 18 05.27 +55 28 55.3 – u H21
2020-05-16 04:00:13 C 15 18 05.23 +55 28 49.8 – u H21
2020-05-16 11:50:52 C 15 17 59.872 +55 07 42.50 – U F51
2020-05-16 12:04:08 C 15 17 59.619 +55 07 05.72 – U F51
2020-05-16 12:30:21 C 15 17 59.143 +55 05 52.93 – U F51
2020-05-17 05:52:24 C 15 17 56.72 +54 18 14.4 – V U71
2020-05-17 05:57:32 C 15 17 56.63 +54 18 00.6 – V U71
2020-05-17 06:02:38 C 15 17 56.47 +54 17 46.6 – V U71
2020-05-17 06:08:02 C 15 17 56.35 +54 17 32.3 – V U71
2020-05-17 10:53:59 C 15 17 53.07 +54 04 29.5 – V T08
2020-05-17 11:28:26 C 15 17 52.40 +54 02 52.9 – V T08
2020-05-17 11:32:30 C 15 17 52.32 +54 02 41.5 – V T08
2020-05-17 11:40:28 C 15 17 52.17 +54 02 19.1 – V T08
2020-05-19 07:50:19 C 15 17 40.60 +51 57 44.9 – V 703
2020-05-19 07:58:07 C 15 17 40.48 +51 57 22.3 – V 703
2020-05-19 08:05:54 C 15 17 40.36 +51 56 59.8 – V 703
2020-05-19 08:13:42 C 15 17 40.24 +51 56 37.2 – V 703
2020-05-19 10:18:18 C 15 17 40.40 +51 50 46.6 – V T05
2020-05-19 10:22:58 C 15 17 40.32 +51 50 33.0 – V T05
2020-05-19 10:31:37 C 15 17 40.17 +51 50 08.1 – V T05
2020-05-19 10:46:48 C 15 17 39.90 +51 49 24.3 – V T05
2020-05-19 19:19:55 C 15 17 39.55 +51 24 32.3 – V C40
2020-05-19 19:20:28 C 15 17 39.56 +51 24 30.7 – V C40
2020-05-19 19:23:20 C 15 17 39.51 +51 24 22.6 – V C40
2020-05-19 19:23:55 C 15 17 39.50 +51 24 20.9 – V C40
2020-05-19 19:24:29 C 15 17 39.48 +51 24 19.2 – V C40
2020-05-19 19:26:11 C 15 17 39.47 +51 24 14.4 – V C40
2020-05-19 19:27:54 C 15 17 39.46 +51 24 09.5 – V C40
2020-05-19 19:28:30 C 15 17 39.45 +51 24 07.8 – V C40
2020-05-19 19:30:12 C 15 17 39.41 +51 24 02.9 – V C40
2020-05-19 19:30:46 C 15 17 39.40 +51 24 01.2 – V C40
2020-05-19 19:31:54 C 15 17 39.39 +51 23 58.0 – V C40
2020-05-19 19:32:30 C 15 17 39.38 +51 23 56.5 – V C40
2020-05-19 19:33:04 C 15 17 39.37 +51 23 54.9 – V C40
2020-05-19 19:33:37 C 15 17 39.37 +51 23 53.2 – V C40
2020-05-19 19:34:46 C 15 17 39.34 +51 23 49.8 – V C40
2020-05-19 19:35:21 C 15 17 39.35 +51 23 48.2 – V C40
2020-05-19 19:35:55 C 15 17 39.33 +51 23 46.7 – V C40
2020-05-19 19:36:29 C 15 17 39.33 +51 23 45.0 – V C40
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2013-05-11 08:20:00 304564740.19 4 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)