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
2020-02-12 09:45:18 C 13 22 26.28 +56 41 12.3 U I41
2020-02-12 10:24:00 C 13 22 16.76 +56 40 55.9 U I41
2020-02-12 11:37:47 C 13 21 58.38 +56 40 22.9 U I41
2020-02-12 12:17:28 C 13 21 48.48 +56 40 04.5 U I41
2020-02-14 08:39:58 C 13 11 06.39 +56 17 26.7 V 703
2020-02-14 08:47:43 C 13 11 04.44 +56 17 22.4 V 703
2020-02-14 08:55:27 C 13 11 02.55 +56 17 18.3 V 703
2020-02-14 09:03:11 C 13 11 00.69 +56 17 14.4 V 703
2020-02-14 09:18:24 C 13 10 56.21 +56 17 05.6 u H21
2020-02-14 09:20:22 C 13 10 55.73 +56 17 04.4 u H21
2020-02-14 09:22:20 C 13 10 55.26 +56 17 03.2 u H21
2020-02-14 09:24:17 C 13 10 54.75 +56 17 02.3 u H21
2020-02-14 09:26:15 C 13 10 54.27 +56 17 01.1 u H21
2020-02-15 15:24:05 C 13 03 41.44 +55 59 14.0 V T08
2020-02-15 15:28:44 C 13 03 40.35 +55 59 10.9 V T08
2020-02-15 15:37:49 C 13 03 38.07 +55 59 04.5 V T08
2020-02-15 15:50:10 C 13 03 35.07 +55 58 56.6 V T08
2020-02-17 08:02:58 C 12 54 03.01 +55 31 38.1 V 703
2020-02-17 08:10:42 C 12 54 01.18 +55 31 33.0 V 703
2020-02-17 08:18:28 C 12 53 59.26 +55 31 27.3 V 703
2020-02-17 08:26:12 C 12 53 57.42 +55 31 21.9 V 703
2020-02-20 09:20:32 C 12 37 03.23 +54 32 31.6 U I41
2020-02-20 09:52:48 C 12 36 55.71 +54 32 03.2 U I41
2020-02-20 09:54:05 C 12 36 55.40 +54 32 02.1 U I41
2020-02-20 11:22:54 C 12 36 34.68 +54 30 42.7 U I41
2020-02-20 11:46:32 C 12 36 29.18 +54 30 21.2 U I41
2020-02-20 14:01:06 C 12 36 00.54 +54 28 09.6 o C94
2020-02-20 14:11:04 C 12 35 58.12 +54 28 00.5 o C94
2020-02-21 12:57:58 C 12 30 50.74 +54 07 12.8 V T05
2020-02-21 13:01:55 C 12 30 49.79 +54 07 08.8 V T05
2020-02-21 13:09:10 C 12 30 48.11 +54 07 01.9 V T05
2020-02-21 13:23:01 C 12 30 44.89 +54 06 48.7 V T05
2020-02-21 20:14:21 S 12 30 24.965 +53 54 23.94 V C57
2020-02-21 20:14:21 s 1 +122479.81 8 +269614.17 6860.0 C57
2020-02-21 21:44:21 S 12 30 06.257 +53 53 01.03 V C57
2020-02-21 21:44:21 s 1 +119957.27 5 +274592.59 3830.0 C57
2020-02-21 22:14:21 S 12 29 59.258 +53 52 27.73 V C57
2020-02-21 22:14:21 s 1 +119104.70 6 +276225.79 5550.0 C57
2020-02-21 23:44:21 S 12 29 41.458 +53 51 07.31 V C57
2020-02-21 23:44:21 s 1 +116513.30 3 +281047.56 910.0 C57
2020-02-22 00:14:21 S 12 29 35.570 +53 50 46.57 V C57
2020-02-22 00:14:21 s 1 +115638.60 5 +282629.11 3210.0 C57
2020-02-22 01:14:21 S 12 29 23.443 +53 49 49.66 V C57
2020-02-22 01:14:21 s 1 +113873.45 2 +285754.07 9390.0 C57
2020-02-22 04:14:21 S 12 28 46.718 +53 46 59.52 V C57
2020-02-22 04:14:21 s 1 +108458.54 7 +294828.62 9580.0 C57
2020-02-22 06:44:21 S 12 28 16.536 +53 44 36.31 V C57
2020-02-22 06:44:21 s 1 +103819.55 6 +302054.23 2000.0 C57
2020-02-22 08:44:21 S 12 27 50.345 +53 42 55.69 V C57
2020-02-22 08:44:21 s 1 +100032.71 9 +307619.92 5330.0 C57
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)