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
2020-02-27 18:14:21 s 1 -169206.02 2 +357323.77 7570.0 C57
2020-02-27 18:44:21 S 12 01 20.016 +51 28 21.65 V C57
2020-02-27 18:44:21 s 1 -170054.45 4 +356495.63 4950.0 C57
2020-02-27 19:44:21 S 12 01 08.165 +51 27 15.23 V C57
2020-02-27 19:44:21 s 1 -171740.97 3 +354816.74 4620.0 C57
2020-02-27 21:14:21 S 12 00 50.158 +51 25 33.35 V C57
2020-02-27 21:14:21 s 1 -174244.45 9 +352241.84 6010.0 C57
2020-02-28 00:44:21 S 12 00 08.102 +51 21 20.74 V C57
2020-02-28 00:44:21 s 1 -179959.10 6 +345969.04 4050.0 C57
2020-02-28 01:14:21 S 12 00 01.716 +51 20 48.44 V C57
2020-02-28 01:14:21 s 1 -180760.54 7 +345042.60 7320.0 C57
2020-02-28 02:44:21 S 11 59 44.333 +51 19 02.17 V C57
2020-02-28 02:44:21 s 1 -183141.78 3 +342217.66 4640.0 C57
2020-02-28 03:14:21 S 11 59 38.822 +51 18 27.25 V C57
2020-02-28 03:14:21 s 1 -183927.72 7 +341260.79 9490.0 C57
2020-02-28 03:44:21 S 11 59 31.565 +51 17 53.20 V C57
2020-02-28 03:44:21 s 1 -184709.71 5 +340296.29 2150.0 C57
2020-02-28 04:14:21 S 11 59 26.573 +51 17 15.76 V C57
2020-02-28 04:14:21 s 1 -185487.71 6 +339324.17 2590.0 C57
2020-02-28 06:14:21 S 11 59 02.813 +51 14 53.81 V C57
2020-02-28 06:14:21 s 1 -188559.18 3 +335359.24 1580.0 C57
2020-02-28 06:44:21 S 11 58 57.238 +51 14 18.20 V C57
2020-02-28 06:44:21 s 1 -189316.74 7 +334348.87 470.0 C57
2020-02-28 07:14:21 S 11 58 50.743 +51 13 40.76 V C57
2020-02-28 07:14:21 s 1 -190070.12 1 +333330.82 6940.0 C57
2020-02-28 07:44:21 S 11 58 44.232 +51 12 58.10 V C57
2020-02-28 07:44:21 s 1 -190819.27 2 +332305.10 980.0 C57
2020-02-28 08:14:21 S 11 58 38.575 +51 12 20.70 V C57
2020-02-28 08:14:21 s 1 -191564.16 3 +331271.70 2540.0 C57
2020-02-28 08:44:21 S 11 58 33.197 +51 11 49.85 V C57
2020-02-28 08:44:21 s 1 -192304.76 0 +330230.60 1590.0 C57
2020-02-28 09:14:21 S 11 58 26.640 +51 11 10.82 V C57
2020-02-28 09:14:21 s 1 -193041.02 7 +329181.81 8090.0 C57
2020-02-28 10:14:21 S 11 58 16.133 +51 09 58.39 V C57
2020-02-28 10:14:21 s 1 -194500.42 5 +327061.09 3320.0 C57
2020-02-28 11:14:21 S 11 58 04.442 +51 08 50.78 V C57
2020-02-28 11:14:21 s 1 -195942.06 7 +324909.48 7950.0 C57
2020-02-28 11:44:21 S 11 57 57.422 +51 08 17.27 V C57
2020-02-28 11:44:21 s 1 -196656.13 6 +323822.07 1210.0 C57
2020-02-28 12:14:21 S 11 57 51.943 +51 07 40.04 V C57
2020-02-28 12:14:21 s 1 -197365.65 4 +322726.91 1710.0 C57
2020-02-28 12:44:21 S 11 57 45.394 +51 06 57.02 V C57
2020-02-28 12:44:21 s 1 -198070.58 2 +321624.01 9410.0 C57
2020-02-28 13:14:21 S 11 57 40.764 +51 06 31.32 V C57
2020-02-28 13:14:21 s 1 -198770.88 3 +320513.33 4280.0 C57
2020-02-28 13:44:21 S 11 57 33.588 +51 05 52.48 V C57
2020-02-28 13:44:21 s 1 -199466.51 7 +319394.89 6280.0 C57
2020-02-28 14:14:21 S 11 57 27.902 +51 05 11.83 V C57
2020-02-28 14:14:21 s 1 -200157.44 5 +318268.67 5380.0 C57
2020-02-28 15:44:21 S 11 57 10.346 +51 03 29.48 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)