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
2021-10-29 04:03:56 S 02 52 21.574 +05 09 09.86 V C57
2021-10-29 04:03:56 s 1 +121294.23 6 +316450.50 7300.0 C57
2021-10-29 04:13:56 S 02 52 21.108 +05 08 49.02 V C57
2021-10-29 04:13:56 s 1 +120995.10 3 +316803.76 5300.0 C57
2021-10-29 04:23:56 S 02 52 20.587 +05 08 27.42 V C57
2021-10-29 04:23:56 s 1 +120695.54 0 +317155.87 1910.0 C57
2021-10-29 04:33:56 S 02 52 20.069 +05 08 06.90 V C57
2021-10-29 04:33:56 s 1 +120395.54 7 +317506.83 7120.0 C57
2021-10-29 04:43:56 S 02 52 19.486 +05 07 44.76 V C57
2021-10-29 04:43:56 s 1 +120095.12 6 +317856.64 960.0 C57
2021-10-29 04:53:56 S 02 52 18.996 +05 07 23.09 V C57
2021-10-29 04:53:56 s 1 +119794.28 0 +318205.30 3410.0 C57
2021-10-29 05:03:56 S 02 52 18.545 +05 07 01.67 V C57
2021-10-29 05:03:56 s 1 +119493.01 1 +318552.81 4500.0 C57
2021-10-29 05:33:56 S 02 52 16.913 +05 05 56.58 V C57
2021-10-29 05:33:56 s 1 +118586.67 8 +319588.46 9590.0 C57
2021-10-29 05:43:56 S 02 52 16.471 +05 05 35.70 V C57
2021-10-29 05:43:56 s 1 +118283.73 2 +319931.38 5260.0 C57
2021-10-29 05:53:56 S 02 52 15.934 +05 05 15.00 V C57
2021-10-29 05:53:56 s 1 +117980.37 2 +320273.16 9590.0 C57
2021-10-29 06:03:56 S 02 52 15.353 +05 04 53.36 V C57
2021-10-29 06:03:56 s 1 +117676.60 0 +320613.80 2580.0 C57
2021-10-29 06:13:56 S 02 52 14.904 +05 04 31.66 V C57
2021-10-29 06:13:56 s 1 +117372.41 6 +320953.29 4250.0 C57
2021-10-29 06:23:56 S 02 52 14.417 +05 04 09.52 V C57
2021-10-29 06:23:56 s 1 +117067.82 4 +321291.64 4600.0 C57
2021-10-29 06:33:56 S 02 52 13.860 +05 03 48.96 V C57
2021-10-29 06:33:56 s 1 +116762.82 4 +321628.85 3630.0 C57
2021-10-29 06:43:56 S 02 52 13.330 +05 03 25.78 V C57
2021-10-29 06:43:56 s 1 +116457.42 0 +321964.92 1360.0 C57
2021-10-29 06:53:56 S 02 52 12.797 +05 03 05.08 V C57
2021-10-29 06:53:56 s 1 +116151.61 1 +322299.85 7780.0 C57
2021-10-29 07:03:56 S 02 52 12.274 +05 02 43.08 V C57
2021-10-29 07:03:56 s 1 +115845.40 2 +322633.65 2910.0 C57
2021-10-29 07:13:56 S 02 52 11.818 +05 02 22.27 V C57
2021-10-29 07:13:56 s 1 +115538.79 2 +322966.30 6750.0 C57
2021-10-29 07:23:56 S 02 52 11.237 +05 01 59.84 V C57
2021-10-29 07:23:56 s 1 +115231.78 4 +323297.81 9310.0 C57
2021-10-29 07:33:56 S 02 52 10.726 +05 01 37.88 V C57
2021-10-29 07:33:56 s 1 +114924.38 0 +323628.19 590.0 C57
2021-10-29 07:43:56 S 02 52 10.198 +05 01 17.29 V C57
2021-10-29 07:43:56 s 1 +114616.58 2 +323957.43 600.0 C57
2021-10-29 08:03:56 S 02 52 09.211 +05 00 33.01 V C57
2021-10-29 08:03:56 s 1 +113999.80 9 +324612.51 6830.0 C57
2021-10-29 08:13:56 S 02 52 08.683 +05 00 11.59 V C57
2021-10-29 08:13:56 s 1 +113690.83 7 +324938.35 3060.0 C57
2021-10-29 08:23:56 S 02 52 08.146 +04 59 50.89 V C57
2021-10-29 08:23:56 s 1 +113381.47 8 +325263.06 8050.0 C57
2021-10-29 08:33:56 S 02 52 07.675 +04 59 28.18 V C57
2021-10-29 08:33:56 s 1 +113071.73 4 +325586.63 1790.0 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)