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
2020-02-25 18:44:21 s 1 -76548.274 0 +401912.99 6590.0 C57
2020-02-25 20:44:21 S 12 10 36.475 +52 19 44.00 V C57
2020-02-25 20:44:21 s 1 -80808.571 0 +401400.80 3970.0 C57
2020-02-25 21:14:21 S 12 10 29.978 +52 19 04.62 V C57
2020-02-25 21:14:21 s 1 -81870.228 0 +401253.74 4620.0 C57
2020-02-25 21:44:21 S 12 10 24.089 +52 18 40.32 V C57
2020-02-25 21:44:21 s 1 -82930.478 0 +401099.07 4830.0 C57
2020-02-25 22:14:21 S 12 10 17.153 +52 18 01.40 V C57
2020-02-25 22:14:21 s 1 -83989.304 0 +400936.82 4630.0 C57
2020-02-25 22:44:21 S 12 10 11.134 +52 17 33.65 V C57
2020-02-25 22:44:21 s 1 -85046.685 0 +400766.99 4040.0 C57
2020-02-26 00:14:21 S 12 09 52.973 +52 16 00.05 V C57
2020-02-26 00:14:21 s 1 -88209.972 0 +400212.04 150.0 C57
2020-02-26 00:44:21 S 12 09 47.026 +52 15 31.32 V C57
2020-02-26 00:44:21 s 1 -89261.385 0 +400011.93 8210.0 C57
2020-02-26 01:14:21 S 12 09 40.231 +52 14 53.52 V C57
2020-02-26 01:14:21 s 1 -90311.256 0 +399804.27 6000.0 C57
2020-02-26 02:44:21 S 12 09 22.368 +52 13 13.30 V C57
2020-02-26 02:44:21 s 1 -93451.435 0 +399135.99 7880.0 C57
2020-02-26 03:44:21 S 12 09 10.394 +52 12 11.70 V C57
2020-02-26 03:44:21 s 1 -95536.829 0 +398652.78 1470.0 C57
2020-02-26 04:14:21 S 12 09 04.150 +52 11 36.89 V C57
2020-02-26 04:14:21 s 1 -96577.050 0 +398399.89 8030.0 C57
2020-02-26 04:44:21 S 12 08 57.790 +52 11 00.82 V C57
2020-02-26 04:44:21 s 1 -97615.594 0 +398139.47 4460.0 C57
2020-02-26 06:14:21 S 12 08 39.314 +52 09 26.03 V C57
2020-02-26 06:14:21 s 1 -100720.97 1 +397313.13 3190.0 C57
2020-02-26 06:44:21 S 12 08 33.382 +52 08 54.46 V C57
2020-02-26 06:44:21 s 1 -101752.61 2 +397022.67 9320.0 C57
2020-02-26 07:14:21 S 12 08 27.746 +52 08 20.87 V C57
2020-02-26 07:14:21 s 1 -102782.47 8 +396724.70 5430.0 C57
2020-02-26 08:14:21 S 12 08 16.066 +52 07 21.22 V C57
2020-02-26 08:14:21 s 1 -104836.80 6 +396106.28 7680.0 C57
2020-02-26 09:14:21 S 12 08 03.622 +52 06 11.95 V C57
2020-02-26 09:14:21 s 1 -106883.79 6 +395457.90 110.0 C57
2020-02-26 10:14:21 S 12 07 51.403 +52 05 09.10 V C57
2020-02-26 10:14:21 s 1 -108923.28 7 +394779.57 2900.0 C57
2020-02-26 11:44:21 S 12 07 32.940 +52 03 29.20 V C57
2020-02-26 11:44:21 s 1 -111968.11 3 +393706.00 6880.0 C57
2020-02-26 13:14:21 S 12 07 14.918 +52 01 45.91 V C57
2020-02-26 13:14:21 s 1 -114995.16 0 +392565.20 4870.0 C57
2020-02-26 14:44:21 S 12 06 56.153 +52 00 06.91 V C57
2020-02-26 14:44:21 s 1 -118003.87 7 +391357.23 500.0 C57
2020-02-26 15:14:21 S 12 06 50.045 +51 59 32.93 V C57
2020-02-26 15:14:21 s 1 -119002.61 3 +390939.65 1740.0 C57
2020-02-26 15:44:21 S 12 06 44.119 +51 59 05.60 V C57
2020-02-26 15:44:21 s 1 -119999.22 9 +390514.62 2640.0 C57
2020-02-26 16:14:21 S 12 06 37.908 +51 58 27.66 V C57
2020-02-26 16:14:21 s 1 -120993.70 5 +390082.14 3160.0 C57
2020-02-26 18:14:21 S 12 06 14.131 +51 56 16.73 V 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)