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
2020-03-01 06:28:29 C 11 48 54.51 +50 07 03.9 U I41
2020-03-01 06:44:21 S 11 49 36.780 +50 14 14.75 V C57
2020-03-01 06:44:21 s 1 -235885.57 7 +200238.18 8510.0 C57
2020-03-01 07:14:21 S 11 49 31.054 +50 13 40.73 V C57
2020-03-01 07:14:21 s 1 -236002.93 1 +198436.43 8070.0 C57
2020-03-01 07:44:20 S 11 49 23.988 +50 12 54.50 V C57
2020-03-01 07:44:20 s 1 -236110.02 0 +196625.93 9310.0 C57
2020-03-01 08:24:46 C 11 48 33.48 +50 04 32.2 U I41
2020-03-01 09:14:20 S 11 49 07.867 +50 11 04.63 V C57
2020-03-01 09:14:20 s 1 -236368.53 8 +191141.83 1930.0 C57
2020-03-01 10:14:21 S 11 48 55.385 +50 09 42.41 V C57
2020-03-01 10:14:21 s 1 -236487.41 4 +187441.83 6590.0 C57
2020-03-01 10:44:20 S 11 48 50.270 +50 09 03.82 V C57
2020-03-01 10:44:20 s 1 -236530.44 7 +185578.62 5420.0 C57
2020-03-01 11:44:21 S 11 48 39.574 +50 07 51.17 V C57
2020-03-01 11:44:21 s 1 -236583.07 4 +181825.74 5460.0 C57
2020-03-01 12:14:20 S 11 48 33.466 +50 07 08.08 V C57
2020-03-01 12:14:20 s 1 -236592.41 1 +179936.04 6410.0 C57
2020-03-01 12:44:21 S 11 48 28.166 +50 06 34.06 V C57
2020-03-01 12:44:21 s 1 -236590.25 4 +178037.51 7810.0 C57
2020-03-01 13:14:21 S 11 48 22.262 +50 05 48.16 V C57
2020-03-01 13:14:21 s 1 -236576.47 0 +176130.12 9510.0 C57
2020-03-01 13:44:20 S 11 48 17.282 +50 05 16.44 V C57
2020-03-01 13:44:20 s 1 -236550.92 1 +174213.87 1380.0 C57
2020-03-01 14:44:21 S 11 48 05.057 +50 03 50.44 V C57
2020-03-01 14:44:21 s 1 -236463.97 3 +170354.77 5060.0 C57
2020-03-01 15:44:21 S 11 47 52.956 +50 02 25.87 V C57
2020-03-01 15:44:21 s 1 -236328.26 7 +166460.16 7690.0 C57
2020-03-01 16:14:21 S 11 47 47.743 +50 01 47.21 V C57
2020-03-01 16:14:21 s 1 -236241.76 2 +164499.52 8240.0 C57
2020-03-01 16:44:20 S 11 47 41.458 +50 01 10.56 V C57
2020-03-01 16:44:20 s 1 -236142.62 1 +162529.99 8070.0 C57
2020-03-01 17:14:19 S 11 47 37.094 +50 00 27.50 V C57
2020-03-01 17:14:19 s 1 -236030.68 9 +160551.57 7030.0 C57
2020-03-01 18:14:20 S 11 47 24.298 +49 59 02.26 V C57
2020-03-01 18:14:20 s 1 -235767.82 3 +156568.03 1670.0 C57
2020-03-01 18:44:21 S 11 47 20.021 +49 58 30.68 V C57
2020-03-01 18:44:21 s 1 -235616.56 5 +154562.90 7030.0 C57
2020-03-01 19:14:21 S 11 47 13.174 +49 57 41.87 V C57
2020-03-01 19:14:21 s 1 -235451.87 1 +152548.88 850.0 C57
2020-03-01 20:14:21 S 11 47 01.831 +49 56 25.62 V C57
2020-03-01 20:14:21 s 1 -235081.49 1 +148494.13 3170.0 C57
2020-03-01 20:44:21 S 11 46 57.142 +49 55 45.34 V C57
2020-03-01 20:44:21 s 1 -234875.45 8 +146453.40 1320.0 C57
2020-03-01 21:14:20 S 11 46 50.820 +49 55 00.12 V C57
2020-03-01 21:14:20 s 1 -234655.29 2 +144403.78 7220.0 C57
2020-03-01 21:44:21 S 11 46 44.930 +49 54 26.14 V C57
2020-03-01 21:44:21 s 1 -234420.81 2 +142345.27 680.0 C57
2020-03-01 22:14:21 S 11 46 40.246 +49 53 47.44 V C57
2020-03-01 22:14:21 s 1 -234171.83 1 +140277.88 1500.0 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)