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
2019-10-29 17:37:44 C 20 35 05.81 -04 07 08.4 V C95
2019-10-29 17:38:43 C 20 35 05.61 -04 07 03.1 V C95
2019-10-29 17:39:42 C 20 35 05.44 -04 06 58.0 V C95
2019-10-29 17:40:42 C 20 35 05.25 -04 06 53.3 V C95
2019-10-29 17:41:41 C 20 35 05.07 -04 06 47.6 V C95
2019-10-29 17:43:39 C 20 35 04.70 -04 06 37.2 V C95
2019-10-29 17:44:39 C 20 35 04.52 -04 06 32.0 V C95
2019-11-08 07:12:46 C 19 56 04.88 +15 25 35.9 V T05
2019-11-08 07:17:24 C 19 56 04.08 +15 25 56.9 V T05
2019-11-08 07:26:39 C 19 56 02.53 +15 26 40.5 V T05
2019-11-08 07:41:24 C 19 56 00.02 +15 27 49.5 V T05
2019-11-13 18:47:44 C 19 34 20.53 +24 59 52.6 V C95
2019-11-13 19:03:36 C 19 34 17.85 +25 00 56.3 V C95
2020-01-05 12:33:11 C 16 13 25.37 +55 00 47.0 V 703
2020-01-05 12:40:20 C 16 13 24.34 +55 00 48.3 V 703
2020-01-05 12:47:30 C 16 13 23.06 +55 00 50.6 V 703
2020-01-05 12:54:39 C 16 13 22.11 +55 00 52.7 V 703
2020-01-10 18:20:23 S 15 55 36.55 +55 37 58.1 L C51
2020-01-10 18:20:34 S 15 55 36.47 +55 37 58.5 L C51
2020-01-10 19:54:38 S 15 55 22.90 +55 38 24.8 L C51
2020-01-10 21:28:53 S 15 55 09.25 +55 38 52.5 L C51
2020-01-10 23:03:08 S 15 54 55.560 +55 39 19.80 L C51
2020-01-11 00:37:12 S 15 54 41.971 +55 39 46.91 L C51
2020-01-11 02:11:27 S 15 54 28.30 +55 40 15.2 L C51
2020-01-11 03:45:42 S 15 54 14.59 +55 40 41.1 L C51
2020-01-11 05:19:46 S 15 54 00.91 +55 41 07.8 L C51
2020-01-11 06:54:01 S 15 53 47.19 +55 41 35.4 L C51
2020-01-11 08:28:16 S 15 53 33.48 +55 42 02.7 L C51
2020-01-11 10:02:20 S 15 53 19.78 +55 42 30.0 L C51
2020-01-11 11:36:36 S 15 53 06.02 +55 42 57.1 L C51
2020-01-11 14:44:54 S 15 52 38.827 +55 43 52.61 L C51
2020-01-11 14:45:05 S 15 52 38.55 +55 43 51.4 L C51
2020-01-11 17:53:25 S 15 52 10.98 +55 44 45.4 L C51
2020-01-14 11:38:25 C 15 42 24.77 +56 03 25.6 V 703
2020-01-14 11:45:35 C 15 42 23.74 +56 03 28.9 V 703
2020-01-14 11:52:44 C 15 42 22.70 +56 03 30.9 V 703
2020-01-14 11:59:53 C 15 42 21.70 +56 03 33.5 V 703
2020-01-14 12:10:23 C 15 42 19.94 +56 03 37.0 V G96
2020-01-14 12:16:43 C 15 42 18.94 +56 03 39.0 V G96
2020-01-14 12:23:03 C 15 42 17.95 +56 03 41.0 V G96
2020-01-14 12:29:22 C 15 42 16.95 +56 03 43.1 V G96
2020-01-18 15:14:25 C 15 26 44.55 +56 30 57.2 V T08
2020-01-18 15:19:11 C 15 26 43.71 +56 30 58.6 V T08
2020-01-18 15:26:55 C 15 26 42.42 +56 31 00.5 V T08
2020-01-18 15:45:28 C 15 26 39.26 +56 31 06.2 V T08
2020-01-22 13:56:55 C 15 10 38.24 +56 54 59.7 V T08
2020-01-22 14:01:34 C 15 10 37.37 +56 55 00.8 V T08
2020-01-22 14:10:18 C 15 10 35.79 +56 55 03.4 V T08
2020-01-22 14:25:52 C 15 10 32.94 +56 55 07.6 V T08
2020-01-24 13:02:00 C 15 02 06.57 +57 05 37.1 V T05
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)