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
2021-10-28 17:13:56 S 02 52 55.351 +05 31 45.59 V C57
2021-10-28 17:13:56 s 1 +139715.31 4 +290976.12 220.0 C57
2021-10-28 17:16:42 C 02 54 20.551 +05 18 43.92 V P07
2021-10-28 17:23:56 S 02 52 54.823 +05 31 25.93 V C57
2021-10-28 17:23:56 s 1 +139448.67 5 +291406.16 4160.0 C57
2021-10-28 17:33:56 S 02 52 54.329 +05 31 04.58 V C57
2021-10-28 17:33:56 s 1 +139181.46 3 +291834.99 6230.0 C57
2021-10-28 17:43:56 S 02 52 53.770 +05 30 44.35 V C57
2021-10-28 17:43:56 s 1 +138913.68 1 +292262.61 6430.0 C57
2021-10-28 17:46:02 C 02 54 19.642 +05 17 46.93 V P07
2021-10-28 17:53:56 S 02 52 53.251 +05 30 24.41 V C57
2021-10-28 17:53:56 s 1 +138645.33 1 +292689.02 4770.0 C57
2021-10-28 18:03:56 S 02 52 52.721 +05 30 03.89 V C57
2021-10-28 18:03:56 s 1 +138376.41 6 +293114.22 1260.0 C57
2021-10-28 18:13:56 S 02 52 52.270 +05 29 42.86 V C57
2021-10-28 18:13:56 s 1 +138106.93 9 +293538.21 5910.0 C57
2021-10-28 18:15:59 C 02 54 18.734 +05 16 48.61 V P07
2021-10-28 18:23:56 S 02 52 51.734 +05 29 22.74 V C57
2021-10-28 18:23:56 s 1 +137836.90 1 +293961.00 8720.0 C57
2021-10-28 18:33:56 S 02 52 51.221 +05 29 03.26 V C57
2021-10-28 18:33:56 s 1 +137566.30 5 +294382.57 9700.0 C57
2021-10-28 18:43:56 S 02 52 50.702 +05 28 41.02 V C57
2021-10-28 18:43:56 s 1 +137295.15 4 +294802.95 8860.0 C57
2021-10-28 18:45:14 C 02 54 17.875 +05 15 51.55 V P07
2021-10-28 18:53:56 S 02 52 50.182 +05 28 21.11 V C57
2021-10-28 18:53:56 s 1 +137023.45 0 +295222.12 6220.0 C57
2021-10-28 19:03:56 S 02 52 49.651 +05 28 00.70 V C57
2021-10-28 19:03:56 s 1 +136751.19 5 +295640.08 1770.0 C57
2021-10-28 19:13:56 S 02 52 49.150 +05 27 40.25 V C57
2021-10-28 19:13:56 s 1 +136478.39 2 +296056.85 5520.0 C57
2021-10-28 19:23:56 S 02 52 48.631 +05 27 19.33 V C57
2021-10-28 19:23:56 s 1 +136205.04 3 +296472.41 7490.0 C57
2021-10-28 19:33:56 S 02 52 48.127 +05 26 58.20 V C57
2021-10-28 19:33:56 s 1 +135931.15 0 +296886.77 7680.0 C57
2021-10-28 19:43:56 S 02 52 47.594 +05 26 37.90 V C57
2021-10-28 19:43:56 s 1 +135656.71 7 +297299.93 6100.0 C57
2021-10-28 19:53:56 S 02 52 47.011 +05 26 18.28 V C57
2021-10-28 19:53:56 s 1 +135381.74 4 +297711.90 2760.0 C57
2021-10-28 20:03:56 S 02 52 46.514 +05 25 57.29 V C57
2021-10-28 20:03:56 s 1 +135106.23 5 +298122.67 7670.0 C57
2021-10-28 20:13:56 S 02 52 46.022 +05 25 36.62 V C57
2021-10-28 20:13:56 s 1 +134830.19 1 +298532.24 820.0 C57
2021-10-28 20:23:56 S 02 52 45.538 +05 25 16.54 V C57
2021-10-28 20:23:56 s 1 +134553.61 6 +298940.62 2240.0 C57
2021-10-28 20:33:56 S 02 52 44.978 +05 24 54.29 V C57
2021-10-28 20:33:56 s 1 +134276.51 1 +299347.80 1930.0 C57
2021-10-28 20:43:56 S 02 52 44.431 +05 24 34.92 V C57
2021-10-28 20:43:56 s 1 +133998.87 9 +299753.79 9890.0 C57
2021-10-28 21:03:56 S 02 52 43.411 +05 23 53.27 V C57
2021-10-28 21:03:56 s 1 +133442.04 2 +300562.20 680.0 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)