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
2021-10-18 05:03:56 s 1 +19122.980 0 +370353.05 2100.0 C57
2021-10-18 05:13:56 S 02 52 33.917 +11 06 18.50 V C57
2021-10-18 05:13:56 s 1 +18754.942 0 +370404.30 1620.0 C57
2021-10-18 05:23:56 S 02 52 33.864 +11 06 04.72 V C57
2021-10-18 05:23:56 s 1 +18386.850 0 +370454.50 1040.0 C57
2021-10-18 05:33:56 S 02 52 33.770 +11 05 55.64 V C57
2021-10-18 05:33:56 s 1 +18018.706 0 +370503.65 360.0 C57
2021-10-18 05:43:56 S 02 52 33.528 +11 05 45.17 V C57
2021-10-18 05:43:56 s 1 +17650.509 0 +370551.76 9580.0 C57
2021-10-18 05:53:56 S 02 52 33.552 +11 05 35.38 V C57
2021-10-18 05:53:56 s 1 +17282.263 0 +370598.81 8700.0 C57
2021-10-18 06:03:56 S 02 52 33.466 +11 05 23.39 V C57
2021-10-18 06:03:56 s 1 +16913.966 0 +370644.81 7730.0 C57
2021-10-18 06:13:56 S 02 52 33.314 +11 05 13.85 V C57
2021-10-18 06:13:56 s 1 +16545.621 0 +370689.77 6670.0 C57
2021-10-18 06:23:56 S 02 52 33.226 +11 05 01.82 V C57
2021-10-18 06:23:56 s 1 +16177.229 0 +370733.68 5530.0 C57
2021-10-18 06:33:56 S 02 52 33.214 +11 04 50.99 V C57
2021-10-18 06:33:56 s 1 +15808.790 0 +370776.54 4310.0 C57
2021-10-18 06:43:56 S 02 52 33.048 +11 04 42.31 V C57
2021-10-18 06:43:56 s 1 +15440.306 0 +370818.36 3010.0 C57
2021-10-18 06:53:56 S 02 52 32.923 +11 04 31.66 V C57
2021-10-18 06:53:56 s 1 +15071.777 0 +370859.12 1640.0 C57
2021-10-18 07:03:56 S 02 52 32.842 +11 04 19.34 V C57
2021-10-18 07:03:56 s 1 +14703.205 0 +370898.84 200.0 C57
2021-10-18 07:13:56 S 02 52 32.522 +11 04 08.94 V C57
2021-10-18 07:13:56 s 1 +14334.591 0 +370937.51 8690.0 C57
2021-10-18 07:23:56 S 02 52 32.683 +11 03 58.10 V C57
2021-10-18 07:23:56 s 1 +13965.936 0 +370975.13 7120.0 C57
2021-10-18 07:33:56 S 02 52 32.525 +11 03 47.52 V C57
2021-10-18 07:33:56 s 1 +13597.241 0 +371011.70 5500.0 C57
2021-10-18 07:43:56 S 02 52 32.436 +11 03 36.68 V C57
2021-10-18 07:43:56 s 1 +13228.506 0 +371047.23 3810.0 C57
2021-10-18 07:53:56 S 02 52 32.340 +11 03 27.22 V C57
2021-10-18 07:53:56 s 1 +12859.734 0 +371081.71 2080.0 C57
2021-10-18 08:03:56 S 02 52 32.251 +11 03 17.03 V C57
2021-10-18 08:03:56 s 1 +12490.924 0 +371115.14 300.0 C57
2021-10-18 08:13:56 S 02 52 32.251 +11 03 05.90 V C57
2021-10-18 08:13:56 s 1 +12122.079 0 +371147.52 8480.0 C57
2021-10-18 08:23:56 S 02 52 31.915 +11 02 56.62 V C57
2021-10-18 08:23:56 s 1 +11753.198 0 +371178.86 6610.0 C57
2021-10-18 08:33:56 S 02 52 31.915 +11 02 47.29 V C57
2021-10-18 08:33:56 s 1 +11384.284 0 +371209.15 4710.0 C57
2021-10-18 08:43:56 S 02 52 32.021 +11 02 33.11 V C57
2021-10-18 08:43:56 s 1 +11015.337 0 +371238.39 2780.0 C57
2021-10-18 08:53:56 S 02 52 31.920 +11 02 22.92 V C57
2021-10-18 08:53:56 s 1 +10646.357 0 +371266.59 810.0 C57
2021-10-18 09:03:56 S 02 52 31.596 +11 02 11.11 V C57
2021-10-18 09:03:56 s 1 +10277.348 0 +371293.73 8830.0 C57
2021-10-18 09:13:56 S 02 52 31.550 +11 02 04.16 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)