3361 Orpheus (1982 HR)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3231610634 ± 2.00e+00
Semi-major axis (a)1.2101508924 AU ± 3.00e+00
Inclination (i)2.65169834° ± 4.00e+00
Long. of Asc. Node (Ω)188.44299382° ± 5.00e+00
Arg. of Perihelion (ω)302.64499143° ± 6.00e+00
Mean Anomaly (M)320.54810304° ± 1.29e-06
Mean Motion (n)0.7403771180°/day ± 2.75e+00
Perihelion dist (q)0.81907724 AU ± 3.16e+00
Aphelion dist (Q)1.60122454 AU ± 4.65e+00
Orbital Period1.33124898 yr ± 4.95e+00
NGA Modelr2
A22.56523269e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.50
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.382″
Uncertainty0
Orbit TypeApollo
MOID0.014472 AU
Observations Used3021
Oppositions11
Arc Total1982-2025
First Observation Used1982-04-24
Last Observation Used2025-11-19
Observations (4857)
Date Type RA Dec Mag Band Observatory
2021-10-21 07:33:56 s 1 -134166.77 8 +286170.81 3440.0 C57
2021-10-21 07:43:56 S 02 52 18.775 +09 38 39.88 V C57
2021-10-21 07:43:56 s 1 -134438.96 5 +285725.97 8540.0 C57
2021-10-21 07:53:56 S 02 52 18.698 +09 38 26.77 V C57
2021-10-21 07:53:56 s 1 -134710.55 9 +285279.87 1470.0 C57
2021-10-21 08:03:56 S 02 52 18.830 +09 38 15.54 V C57
2021-10-21 08:03:56 s 1 -134981.55 7 +284832.50 2220.0 C57
2021-10-21 08:13:56 S 02 52 18.917 +09 38 03.44 V C57
2021-10-21 08:13:56 s 1 -135251.95 6 +284383.86 780.0 C57
2021-10-21 08:23:56 S 02 52 19.025 +09 37 48.90 V C57
2021-10-21 08:23:56 s 1 -135521.75 5 +283933.95 7140.0 C57
2021-10-21 08:33:56 S 02 52 19.006 +09 37 36.98 V C57
2021-10-21 08:33:56 s 1 -135790.95 0 +283482.76 1290.0 C57
2021-10-21 08:43:56 S 02 52 19.104 +09 37 22.76 V C57
2021-10-21 08:43:56 s 1 -136059.53 8 +283030.31 3220.0 C57
2021-10-21 08:53:56 S 02 52 19.094 +09 37 10.56 V C57
2021-10-21 08:53:56 s 1 -136327.51 7 +282576.57 2920.0 C57
2021-10-21 09:03:56 S 02 52 19.135 +09 36 58.46 V C57
2021-10-21 09:03:56 s 1 -136594.88 3 +282121.56 390.0 C57
2021-10-21 09:13:56 S 02 52 19.250 +09 36 45.40 V C57
2021-10-21 09:13:56 s 1 -136861.63 5 +281665.27 5610.0 C57
2021-10-21 09:23:56 S 02 52 19.289 +09 36 32.72 V C57
2021-10-21 09:23:56 s 1 -137127.76 9 +281207.71 8570.0 C57
2021-10-21 09:33:56 S 02 52 19.423 +09 36 19.08 V C57
2021-10-21 09:33:56 s 1 -137393.28 2 +280748.86 9260.0 C57
2021-10-21 09:43:56 S 02 52 19.572 +09 36 05.72 V C57
2021-10-21 09:43:56 s 1 -137658.17 1 +280288.73 7670.0 C57
2021-10-21 09:53:56 S 02 52 19.666 +09 35 53.70 V C57
2021-10-21 09:53:56 s 1 -137922.43 5 +279827.32 3800.0 C57
2021-10-21 10:03:56 S 02 52 19.574 +09 35 39.66 V C57
2021-10-21 10:03:56 s 1 -138186.06 9 +279364.62 7630.0 C57
2021-10-21 10:13:56 S 02 52 19.610 +09 35 28.50 V C57
2021-10-21 10:13:56 s 1 -138449.07 1 +278900.64 9150.0 C57
2021-10-21 10:23:56 S 02 52 19.764 +09 35 14.60 V C57
2021-10-21 10:23:56 s 1 -138711.43 8 +278435.37 8350.0 C57
2021-10-21 10:33:56 S 02 52 19.906 +09 34 59.92 V C57
2021-10-21 10:33:56 s 1 -138973.16 7 +277968.81 5230.0 C57
2021-10-21 10:43:56 S 02 52 19.966 +09 34 48.25 V C57
2021-10-21 10:43:56 s 1 -139234.25 6 +277500.97 9760.0 C57
2021-10-21 10:53:56 S 02 52 20.064 +09 34 34.57 V C57
2021-10-21 10:53:56 s 1 -139494.70 0 +277031.83 1950.0 C57
2021-10-21 11:03:56 S 02 52 20.052 +09 34 21.97 V C57
2021-10-21 11:03:56 s 1 -139754.49 8 +276561.40 1780.0 C57
2021-10-21 11:13:56 S 02 52 20.129 +09 34 09.34 V C57
2021-10-21 11:13:56 s 1 -140013.64 6 +276089.68 9240.0 C57
2021-10-21 11:23:56 S 02 52 20.280 +09 33 56.66 V C57
2021-10-21 11:23:56 s 1 -140272.14 2 +275616.67 4320.0 C57
2021-10-21 11:33:56 S 02 52 20.316 +09 33 44.50 V C57
2021-10-21 11:33:56 s 1 -140529.98 2 +275142.35 7010.0 C57
2021-10-21 11:43:56 S 02 52 20.544 +09 33 30.31 V C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2021-11-13 07:00:00 55352696.248 1 us 8560 -14 -14
2021-11-14 05:40:00 52231075.023 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)