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 03:23:56 s 1 -127177.08 3 +296883.11 7240.0 C57
2021-10-21 03:33:56 S 02 52 17.220 +09 44 03.12 V C57
2021-10-21 03:33:56 s 1 -127463.24 8 +296469.59 3650.0 C57
2021-10-21 03:43:56 S 02 52 17.304 +09 43 50.70 V C57
2021-10-21 03:43:56 s 1 -127748.88 4 +296054.82 8120.0 C57
2021-10-21 03:53:56 S 02 52 17.254 +09 43 37.42 V C57
2021-10-21 03:53:56 s 1 -128033.98 9 +295638.82 630.0 C57
2021-10-21 04:03:56 S 02 52 17.338 +09 43 24.60 V C57
2021-10-21 04:03:56 s 1 -128318.55 9 +295221.58 1180.0 C57
2021-10-21 04:13:56 S 02 52 17.472 +09 43 11.78 V C57
2021-10-21 04:13:56 s 1 -128602.59 3 +294803.09 9760.0 C57
2021-10-21 04:23:56 S 02 52 17.506 +09 42 59.36 V C57
2021-10-21 04:23:56 s 1 -128886.08 8 +294383.36 6350.0 C57
2021-10-21 04:33:56 S 02 52 17.614 +09 42 46.80 V C57
2021-10-21 04:33:56 s 1 -129169.04 2 +293962.39 950.0 C57
2021-10-21 04:43:56 S 02 52 17.664 +09 42 32.54 V C57
2021-10-21 04:43:56 s 1 -129451.45 2 +293540.17 3560.0 C57
2021-10-21 04:53:56 S 02 52 17.690 +09 42 21.24 V C57
2021-10-21 04:53:56 s 1 -129733.31 6 +293116.71 4150.0 C57
2021-10-21 05:03:56 S 02 52 17.726 +09 42 07.99 V C57
2021-10-21 05:03:56 s 1 -130014.63 1 +292691.99 2730.0 C57
2021-10-21 05:13:56 S 02 52 17.702 +09 41 54.53 V C57
2021-10-21 05:13:56 s 1 -130295.39 5 +292266.03 9290.0 C57
2021-10-21 05:23:56 S 02 52 17.863 +09 41 40.60 V C57
2021-10-21 05:23:56 s 1 -130575.60 5 +291838.82 3810.0 C57
2021-10-21 05:33:56 S 02 52 18.005 +09 41 27.82 V C57
2021-10-21 05:33:56 s 1 -130855.25 9 +291410.36 6290.0 C57
2021-10-21 05:43:56 S 02 52 18.074 +09 41 16.66 V C57
2021-10-21 05:43:56 s 1 -131134.35 4 +290980.65 6720.0 C57
2021-10-21 05:53:56 S 02 52 17.983 +09 41 03.26 V C57
2021-10-21 05:53:56 s 1 -131412.88 8 +290549.68 5090.0 C57
2021-10-21 06:03:56 S 02 52 18.096 +09 40 50.48 V C57
2021-10-21 06:03:56 s 1 -131690.85 8 +290117.46 1380.0 C57
2021-10-21 06:13:56 S 02 52 18.144 +09 40 38.03 V C57
2021-10-21 06:13:56 s 1 -131968.26 1 +289683.98 5600.0 C57
2021-10-21 06:23:56 S 02 52 18.139 +09 40 24.31 V C57
2021-10-21 06:23:56 s 1 -132245.09 5 +289249.25 7740.0 C57
2021-10-21 06:33:56 S 02 52 18.233 +09 40 10.92 V C57
2021-10-21 06:33:56 s 1 -132521.35 7 +288813.25 7770.0 C57
2021-10-21 06:43:56 S 02 52 18.295 +09 39 59.29 V C57
2021-10-21 06:43:56 s 1 -132797.04 5 +288376.00 5700.0 C57
2021-10-21 06:53:56 S 02 52 18.305 +09 39 46.87 V C57
2021-10-21 06:53:56 s 1 -133072.15 6 +287937.49 1510.0 C57
2021-10-21 07:03:56 S 02 52 18.444 +09 39 32.29 V C57
2021-10-21 07:03:56 s 1 -133346.68 8 +287497.71 5200.0 C57
2021-10-21 07:13:56 S 02 52 18.473 +09 39 19.69 V C57
2021-10-21 07:13:56 s 1 -133620.63 7 +287056.68 6760.0 C57
2021-10-21 07:23:56 S 02 52 18.598 +09 39 07.67 V C57
2021-10-21 07:23:56 s 1 -133894.00 1 +286614.37 6180.0 C57
2021-10-21 07:33:56 S 02 52 18.698 +09 38 54.74 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)