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
2021-10-27 12:53:56 S 02 54 22.171 +06 25 50.34 V C57
2021-10-27 12:53:56 s 1 +174133.49 4 +199237.68 3820.0 C57
2021-10-27 13:03:56 S 02 54 21.674 +06 25 31.87 V C57
2021-10-27 13:03:56 s 1 +174013.18 7 +199892.13 3250.0 C57
2021-10-27 13:13:56 S 02 54 21.182 +06 25 13.87 V C57
2021-10-27 13:13:56 s 1 +173891.62 9 +200545.13 8500.0 C57
2021-10-27 13:23:56 S 02 54 20.726 +06 24 56.84 V C57
2021-10-27 13:23:56 s 1 +173768.82 8 +201196.69 9600.0 C57
2021-10-27 13:33:56 S 02 54 20.256 +06 24 39.10 V C57
2021-10-27 13:33:56 s 1 +173644.78 8 +201846.81 6560.0 C57
2021-10-27 13:43:56 S 02 54 19.706 +06 24 20.81 V C57
2021-10-27 13:43:56 s 1 +173519.51 7 +202495.50 9400.0 C57
2021-10-27 13:53:56 S 02 54 19.222 +06 24 04.28 V C57
2021-10-27 13:53:56 s 1 +173393.02 1 +203142.75 8150.0 C57
2021-10-27 14:03:56 S 02 54 18.617 +06 23 45.20 V C57
2021-10-27 14:03:56 s 1 +173265.30 5 +203788.56 2830.0 C57
2021-10-27 14:13:56 S 02 54 18.240 +06 23 26.92 V C57
2021-10-27 14:13:56 s 1 +173136.37 6 +204432.95 3450.0 C57
2021-10-27 14:23:56 S 02 54 17.726 +06 23 09.38 V C57
2021-10-27 14:23:56 s 1 +173006.24 0 +205075.90 40.0 C57
2021-10-27 14:33:56 S 02 54 17.239 +06 22 52.50 V C57
2021-10-27 14:33:56 s 1 +172874.90 4 +205717.43 2620.0 C57
2021-10-27 14:43:56 S 02 54 16.704 +06 22 33.49 V C57
2021-10-27 14:43:56 s 1 +172742.37 2 +206357.52 1210.0 C57
2021-10-27 14:53:56 S 02 54 16.198 +06 22 15.46 V C57
2021-10-27 14:53:56 s 1 +172608.65 1 +206996.19 5830.0 C57
2021-10-27 15:03:56 S 02 54 15.670 +06 21 57.74 V C57
2021-10-27 15:03:56 s 1 +172473.74 7 +207633.44 6500.0 C57
2021-10-27 15:13:56 S 02 54 15.252 +06 21 40.14 V C57
2021-10-27 15:13:56 s 1 +172337.66 5 +208269.26 3240.0 C57
2021-10-27 15:23:56 S 02 54 14.734 +06 21 21.96 V C57
2021-10-27 15:23:56 s 1 +172200.41 2 +208903.66 6060.0 C57
2021-10-27 15:33:56 S 02 54 14.191 +06 21 04.32 V C57
2021-10-27 15:33:56 s 1 +172061.99 4 +209536.64 5000.0 C57
2021-10-27 15:43:56 S 02 54 13.694 +06 20 46.25 V C57
2021-10-27 15:43:56 s 1 +171922.41 5 +210168.21 60.0 C57
2021-10-27 15:53:56 S 02 54 13.171 +06 20 27.85 V C57
2021-10-27 15:53:56 s 1 +171781.68 2 +210798.35 1270.0 C57
2021-10-27 16:03:56 S 02 54 12.754 +06 20 10.10 V C57
2021-10-27 16:03:56 s 1 +171639.80 1 +211427.08 8650.0 C57
2021-10-27 16:13:56 S 02 54 12.182 +06 19 51.10 V C57
2021-10-27 16:13:56 s 1 +171496.77 7 +212054.40 2220.0 C57
2021-10-27 16:23:56 S 02 54 11.734 +06 19 34.32 V C57
2021-10-27 16:23:56 s 1 +171352.61 6 +212680.30 1990.0 C57
2021-10-27 16:33:56 S 02 54 11.203 +06 19 15.96 V C57
2021-10-27 16:33:56 s 1 +171207.32 3 +213304.80 7980.0 C57
2021-10-27 16:43:56 S 02 54 10.774 +06 18 57.92 V C57
2021-10-27 16:43:56 s 1 +171060.90 4 +213927.88 220.0 C57
2021-10-27 16:53:56 S 02 54 10.198 +06 18 39.49 V C57
2021-10-27 16:53:56 s 1 +170913.36 5 +214549.56 8720.0 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)