136993 (1998 ST49)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5954841834 ± 9.03e-09
Semi-major axis (a)2.3089660226 AU ± 1.05e-09
Inclination (i)24.47489654° ± 3.96e-06
Long. of Asc. Node (Ω)18.18522525° ± 1.53e-06
Arg. of Perihelion (ω)48.11355347° ± 3.84e-06
Mean Anomaly (M)253.30267173° ± 1.08e-06
Mean Motion (n)0.2809221367°/day ± 1.92e-10
Perihelion dist (q)0.93401328 AU ± 2.08e-08
Aphelion dist (Q)3.68391877 AU ± 2.09e-08
Orbital Period3.50853904 yr ± 2.39e-09
Physical Parameters
H (abs. magnitude)17.85
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.620″
Uncertainty0
Orbit TypeApollo
MOID0.053935 AU
Observations Used960
Radar Obs Used7
Oppositions10
Arc Total1998-2012
First Observation Used1998-09-29
Last Observation Used2020-04-28
Observations (1267)
Date Type RA Dec Mag Band Observatory
2019-09-24 04:36:04 C 23 30 49.93 -46 38 13.6 q X74
2019-09-27 10:09:35 C 23 16 00.01 -45 46 31.3 V T05
2019-09-27 10:14:59 C 23 15 58.91 -45 46 26.9 V T05
2019-09-27 10:22:57 C 23 15 57.24 -45 46 20.1 V T05
2019-09-27 10:39:30 C 23 15 53.78 -45 46 06.1 V T05
2019-09-28 12:14:45 C 23 10 44.51 -45 22 47.3 q E89
2019-09-28 12:23:50 C 23 10 42.59 -45 22 38.5 q E89
2019-09-28 12:31:41 C 23 10 40.96 -45 22 30.9 q E89
2019-09-28 12:39:25 C 23 10 39.30 -45 22 22.9 q E89
2019-09-28 12:47:26 C 23 10 37.62 -45 22 15.2 q E89
2019-09-28 12:55:03 C 23 10 36.01 -45 22 07.6 q E89
2019-09-29 09:00:35 C 23 06 29.33 -45 02 12.3 V T08
2019-09-29 09:08:01 C 23 06 27.74 -45 02 04.8 V T08
2019-09-29 09:12:07 C 23 06 26.87 -45 02 00.4 V T08
2019-09-29 09:29:00 C 23 06 23.17 -45 01 42.5 V T08
2019-10-03 08:22:13 C 22 46 08.78 -42 56 52.7 V T08
2019-10-03 08:26:17 C 22 46 07.84 -42 56 46.5 V T08
2019-10-03 08:33:41 C 22 46 06.12 -42 56 34.7 V T08
2019-10-03 08:49:01 C 22 46 02.62 -42 56 10.2 V T08
2019-10-05 20:28:50 C 22 32 53.21 -41 10 16.0 o K95
2019-10-05 20:47:48 C 22 32 48.81 -41 09 38.5 o K95
2019-10-06 06:18:42 C 22 30 40.10 -40 50 33.1 o W92
2019-10-06 06:33:47 C 22 30 36.75 -40 50 01.6 o W92
2019-10-06 07:10:28 C 22 30 28.46 -40 48 44.7 o W92
2019-10-06 07:38:59 C 22 30 22.12 -40 47 45.1 o W92
2019-10-07 06:29:23 C 22 25 19.87 -40 00 14.7 V T08
2019-10-07 06:34:03 C 22 25 18.78 -40 00 04.5 V T08
2019-10-07 06:42:11 C 22 25 16.89 -39 59 47.0 V T08
2019-10-07 06:56:51 C 22 25 13.44 -39 59 15.4 V T08
2019-10-07 07:18:55 C 22 25 05.70 -39 57 51.5 o W92
2019-10-07 07:34:21 C 22 25 02.23 -39 57 17.5 o W92
2019-10-12 11:42:34 C 21 57 28.50 -34 31 28.7 q E89
2019-10-12 11:50:15 C 21 57 26.78 -34 31 04.9 q E89
2019-10-12 11:57:45 C 21 57 25.07 -34 30 41.1 q E89
2019-10-12 12:10:04 C 21 57 22.29 -34 30 02.7 q E89
2019-10-13 08:04:17 C 21 53 01.81 -33 27 57.6 V T05
2019-10-13 08:09:01 C 21 53 00.75 -33 27 42.0 V T05
2019-10-13 08:16:23 C 21 52 59.06 -33 27 18.0 V T05
2019-10-13 08:33:41 C 21 52 55.11 -33 26 21.9 V T05
2019-10-15 06:12:56 C 21 43 03.67 -30 51 20.2 V T08
2019-10-15 06:31:44 C 21 42 59.40 -30 50 13.0 V T08
2019-10-15 06:39:29 C 21 42 57.65 -30 49 45.6 V T08
2019-10-15 06:43:37 C 21 42 56.70 -30 49 30.6 V T08
2019-10-17 07:18:43 C 21 32 37.87 -27 47 31.2 V T05
2019-10-17 07:38:38 C 21 32 33.48 -27 46 12.8 V T05
2019-10-17 07:49:05 C 21 32 31.16 -27 45 31.5 V T05
2019-10-18 00:46:33 S 21 28 59.558 -26 37 31.76 L C51
2019-10-18 03:55:03 S 21 28 20.42 -26 24 47.5 L C51
2019-10-18 07:03:33 S 21 27 41.34 -26 11 59.3 L C51
2019-10-18 08:37:48 S 21 27 21.82 -26 05 33.6 L C51
Radar Observations (7)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2012-10-15 01:30:00 103676.181 2 Hz 2380 -1 -1
2012-10-15 01:43:00 79585327.19 4 us 2380 -1 -1
2012-10-16 01:21:00 76431984.89 4 us 2380 -1 -1
2012-10-17 01:14:00 74366245.24 2 us 2380 -1 -1
2012-10-18 05:20:00 -4600.368 4 Hz 8560 -14 -14
2012-10-18 23:56:00 73851720.04 2 us 2380 -1 -1
2012-10-19 23:57:00 75404704.71 2 us 2380 -1 -1
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)