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
2021-10-19 08:33:56 s 1 -41559.875 0 +364629.89 5010.0 C57
2021-10-19 08:43:56 S 02 52 20.426 +10 36 04.75 V C57
2021-10-19 08:43:56 s 1 -41922.628 0 +364507.72 3120.0 C57
2021-10-19 08:53:56 S 02 52 20.345 +10 35 54.13 V C57
2021-10-19 08:53:56 s 1 -42285.260 0 +364384.48 720.0 C57
2021-10-19 09:03:56 S 02 52 20.366 +10 35 41.78 V C57
2021-10-19 09:03:56 s 1 -42647.770 0 +364260.18 7800.0 C57
2021-10-19 09:13:56 S 02 52 20.220 +10 35 32.17 V C57
2021-10-19 09:13:56 s 1 -43010.157 0 +364134.81 4370.0 C57
2021-10-19 09:23:56 S 02 52 20.196 +10 35 18.82 V C57
2021-10-19 09:23:56 s 1 -43372.419 0 +364008.37 420.0 C57
2021-10-19 09:33:56 S 02 52 20.232 +10 35 08.56 V C57
2021-10-19 09:33:56 s 1 -43734.556 0 +363880.87 5940.0 C57
2021-10-19 09:43:56 S 02 52 20.117 +10 34 56.24 V C57
2021-10-19 09:43:56 s 1 -44096.567 0 +363752.31 930.0 C57
2021-10-19 09:53:56 S 02 52 19.946 +10 34 45.05 V C57
2021-10-19 09:53:56 s 1 -44458.449 0 +363622.68 5380.0 C57
2021-10-19 10:03:56 S 02 52 19.954 +10 34 33.60 V C57
2021-10-19 10:03:56 s 1 -44820.203 0 +363491.98 9290.0 C57
2021-10-19 10:13:56 S 02 52 19.814 +10 34 20.53 V C57
2021-10-19 10:13:56 s 1 -45181.827 0 +363360.21 2670.0 C57
2021-10-19 10:23:56 S 02 52 19.884 +10 34 09.52 V C57
2021-10-19 10:23:56 s 1 -45543.319 0 +363227.38 5490.0 C57
2021-10-19 10:33:56 S 02 52 19.754 +10 33 59.04 V C57
2021-10-19 10:33:56 s 1 -45904.680 0 +363093.48 7770.0 C57
2021-10-19 10:43:56 S 02 52 19.637 +10 33 46.58 V C57
2021-10-19 10:43:56 s 1 -46265.906 0 +362958.51 9490.0 C57
2021-10-19 10:53:56 S 02 52 19.598 +10 33 34.74 V C57
2021-10-19 10:53:56 s 1 -46626.998 0 +362822.47 650.0 C57
2021-10-19 11:03:56 S 02 52 19.666 +10 33 23.33 V C57
2021-10-19 11:03:56 s 1 -46987.955 0 +362685.36 1250.0 C57
2021-10-19 11:13:56 S 02 52 19.608 +10 33 12.17 V C57
2021-10-19 11:13:56 s 1 -47348.774 0 +362547.19 1290.0 C57
2021-10-19 11:23:56 S 02 52 19.526 +10 33 00.65 V C57
2021-10-19 11:23:56 s 1 -47709.455 0 +362407.94 750.0 C57
2021-10-19 11:33:56 S 02 52 19.375 +10 32 47.69 V C57
2021-10-19 11:33:56 s 1 -48069.997 0 +362267.63 9640.0 C57
2021-10-19 11:43:56 S 02 52 19.366 +10 32 39.16 V C57
2021-10-19 11:43:56 s 1 -48430.399 0 +362126.24 7940.0 C57
2021-10-19 12:03:56 S 02 52 19.255 +10 32 15.25 V C57
2021-10-19 12:03:56 s 1 -49150.777 0 +361840.26 2810.0 C57
2021-10-19 12:13:56 S 02 52 19.070 +10 32 01.68 V C57
2021-10-19 12:13:56 s 1 -49510.750 0 +361695.66 9350.0 C57
2021-10-19 12:23:56 S 02 52 19.138 +10 31 52.43 V C57
2021-10-19 12:23:56 s 1 -49870.579 0 +361550.00 5300.0 C57
2021-10-19 12:33:56 S 02 52 19.061 +10 31 40.30 V C57
2021-10-19 12:33:56 s 1 -50230.261 0 +361403.26 650.0 C57
2021-10-19 12:43:56 S 02 52 19.094 +10 31 28.63 V C57
2021-10-19 12:43:56 s 1 -50589.796 0 +361255.44 5400.0 C57
2021-10-19 12:53:56 S 02 52 19.032 +10 31 16.28 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)