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
2021-10-20 01:33:56 s 1 -77735.185 0 +346621.85 7470.0 C57
2021-10-20 01:53:56 S 02 52 15.878 +10 15 56.59 V C57
2021-10-20 01:53:56 s 1 -78423.411 0 +346155.23 4930.0 C57
2021-10-20 02:03:56 S 02 52 15.929 +10 15 42.19 V C57
2021-10-20 02:03:56 s 1 -78767.151 0 +345920.25 7220.0 C57
2021-10-20 02:13:56 S 02 52 15.922 +10 15 32.33 V C57
2021-10-20 02:13:56 s 1 -79110.640 0 +345684.16 8540.0 C57
2021-10-20 02:23:56 S 02 52 15.775 +10 15 20.23 V C57
2021-10-20 02:23:56 s 1 -79453.877 0 +345446.96 8880.0 C57
2021-10-20 02:33:56 S 02 52 15.780 +10 15 07.85 V C57
2021-10-20 02:33:56 s 1 -79796.860 0 +345208.66 8250.0 C57
2021-10-20 02:43:56 S 02 52 15.790 +10 14 55.86 V C57
2021-10-20 02:43:56 s 1 -80139.589 0 +344969.23 6630.0 C57
2021-10-20 02:53:56 S 02 52 15.749 +10 14 43.69 V C57
2021-10-20 02:53:56 s 1 -80482.062 0 +344728.70 4020.0 C57
2021-10-20 03:03:56 S 02 52 15.634 +10 14 30.88 V C57
2021-10-20 03:03:56 s 1 -80824.276 0 +344487.06 430.0 C57
2021-10-20 03:13:56 S 02 52 15.655 +10 14 19.32 V C57
2021-10-20 03:13:56 s 1 -81166.232 0 +344244.30 5830.0 C57
2021-10-20 03:23:56 S 02 52 15.710 +10 14 07.48 V C57
2021-10-20 03:23:56 s 1 -81507.927 0 +344000.42 230.0 C57
2021-10-20 03:33:56 S 02 52 15.624 +10 13 55.06 V C57
2021-10-20 03:33:56 s 1 -81849.361 0 +343755.43 3620.0 C57
2021-10-20 03:43:56 S 02 52 15.763 +10 13 43.28 V C57
2021-10-20 03:43:56 s 1 -82190.531 0 +343509.33 6000.0 C57
2021-10-20 03:53:56 S 02 52 15.583 +10 13 33.02 V C57
2021-10-20 03:53:56 s 1 -82531.436 0 +343262.11 7350.0 C57
2021-10-20 04:03:56 S 02 52 15.559 +10 13 19.85 V C57
2021-10-20 04:03:56 s 1 -82872.074 0 +343013.77 7690.0 C57
2021-10-20 04:13:56 S 02 52 15.434 +10 13 06.35 V C57
2021-10-20 04:13:56 s 1 -83212.445 0 +342764.32 7000.0 C57
2021-10-20 04:23:56 S 02 52 15.571 +10 12 53.24 V C57
2021-10-20 04:23:56 s 1 -83552.547 0 +342513.74 5270.0 C57
2021-10-20 04:33:56 S 02 52 15.425 +10 12 42.01 V C57
2021-10-20 04:33:56 s 1 -83892.379 0 +342262.05 2500.0 C57
2021-10-20 04:43:56 S 02 52 15.509 +10 12 29.59 V C57
2021-10-20 04:43:56 s 1 -84231.938 0 +342009.24 8690.0 C57
2021-10-20 04:53:56 S 02 52 15.466 +10 12 18.36 V C57
2021-10-20 04:53:56 s 1 -84571.224 0 +341755.31 3830.0 C57
2021-10-20 05:03:56 S 02 52 15.473 +10 12 06.34 V C57
2021-10-20 05:03:56 s 1 -84910.234 0 +341500.26 7910.0 C57
2021-10-20 05:13:56 S 02 52 15.442 +10 11 53.81 V C57
2021-10-20 05:13:56 s 1 -85248.968 0 +341244.09 940.0 C57
2021-10-20 05:23:56 S 02 52 15.353 +10 11 43.30 V C57
2021-10-20 05:23:56 s 1 -85587.425 0 +340986.80 2900.0 C57
2021-10-20 05:33:56 S 02 52 15.358 +10 11 30.26 V C57
2021-10-20 05:33:56 s 1 -85925.602 0 +340728.38 3790.0 C57
2021-10-20 05:43:56 S 02 52 15.370 +10 11 18.06 V C57
2021-10-20 05:43:56 s 1 -86263.497 0 +340468.84 3600.0 C57
2021-10-20 05:53:56 S 02 52 15.319 +10 11 05.68 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)