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
2021-10-14 07:13:56 s 1 +173698.69 0 +160009.27 7900.0 C57
2021-10-14 07:23:56 S 02 53 46.099 +12 27 28.84 V C57
2021-10-14 07:23:56 s 1 +173650.97 9 +160755.44 3100.0 C57
2021-10-14 07:33:56 S 02 53 45.768 +12 27 25.49 V C57
2021-10-14 07:33:56 s 1 +173601.54 3 +161500.02 2500.0 C57
2021-10-14 07:43:56 S 02 53 45.754 +12 27 15.77 V C57
2021-10-14 07:43:56 s 1 +173550.39 3 +162243.01 6150.0 C57
2021-10-14 07:53:56 S 02 53 45.749 +12 27 09.25 V C57
2021-10-14 07:53:56 s 1 +173497.53 9 +162984.40 4070.0 C57
2021-10-14 08:03:56 S 02 53 45.506 +12 27 04.18 V C57
2021-10-14 08:03:56 s 1 +173442.99 0 +163724.21 6300.0 C57
2021-10-14 08:23:56 S 02 53 45.293 +12 26 52.87 V C57
2021-10-14 08:23:56 s 1 +173328.84 9 +165199.05 3830.0 C57
2021-10-14 08:53:56 S 02 53 45.082 +12 26 31.42 V C57
2021-10-14 08:53:56 s 1 +173145.17 3 +167399.42 3270.0 C57
2021-10-14 09:03:56 S 02 53 44.868 +12 26 25.69 V C57
2021-10-14 09:03:56 s 1 +173080.66 2 +168129.71 2050.0 C57
2021-10-14 09:13:56 S 02 53 44.774 +12 26 14.71 V C57
2021-10-14 09:13:56 s 1 +173014.52 4 +168858.43 5360.0 C57
2021-10-14 09:23:56 S 02 53 44.611 +12 26 11.11 V C57
2021-10-14 09:23:56 s 1 +172946.76 7 +169585.56 3250.0 C57
2021-10-14 09:33:56 S 02 53 44.311 +12 26 03.12 V C57
2021-10-14 09:33:56 s 1 +172877.40 2 +170311.12 5730.0 C57
2021-10-14 09:43:56 S 02 53 44.470 +12 25 56.42 V C57
2021-10-14 09:43:56 s 1 +172806.43 8 +171035.10 2840.0 C57
2021-10-14 09:53:56 S 02 53 44.287 +12 25 50.95 V C57
2021-10-14 09:53:56 s 1 +172733.88 2 +171757.51 4620.0 C57
2021-10-14 10:03:56 S 02 53 44.237 +12 25 44.94 V C57
2021-10-14 10:03:56 s 1 +172659.74 5 +172478.35 1080.0 C57
2021-10-14 10:13:56 S 02 53 43.793 +12 25 39.65 V C57
2021-10-14 10:13:56 s 1 +172584.03 6 +173197.61 2260.0 C57
2021-10-14 10:23:56 S 02 53 43.872 +12 25 31.76 V C57
2021-10-14 10:23:56 s 1 +172506.76 3 +173915.31 8200.0 C57
2021-10-14 10:33:56 S 02 53 43.666 +12 25 26.18 V C57
2021-10-14 10:33:56 s 1 +172427.93 5 +174631.45 8920.0 C57
2021-10-14 10:43:56 S 02 53 43.399 +12 25 17.33 V C57
2021-10-14 10:43:56 s 1 +172347.56 0 +175346.01 4450.0 C57
2021-10-14 10:44:46 C 02 53 48.21 +12 13 09.7 V T08
2021-10-14 10:47:25 C 02 53 48.21 +12 13 07.8 V T08
2021-10-14 10:51:24 C 02 53 48.21 +12 13 04.9 V T08
2021-10-14 10:53:56 S 02 53 43.507 +12 25 11.71 V C57
2021-10-14 10:53:56 s 1 +172265.64 8 +176059.02 4810.0 C57
2021-10-14 11:03:56 S 02 53 43.397 +12 25 05.45 V C57
2021-10-14 11:03:56 s 1 +172182.20 7 +176770.46 50.0 C57
2021-10-14 11:13:56 S 02 53 43.224 +12 24 57.64 V C57
2021-10-14 11:13:56 s 1 +172097.24 6 +177480.34 180.0 C57
2021-10-14 11:23:56 S 02 53 42.886 +12 24 51.88 V C57
2021-10-14 11:23:56 s 1 +172010.77 3 +178188.67 5250.0 C57
2021-10-14 11:26:46 C 02 53 48.27 +12 12 39.6 V T08
2021-10-14 11:33:56 S 02 53 43.090 +12 24 42.80 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)