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
2021-10-15 14:13:56 S 02 53 20.921 +12 04 57.83 V C57
2021-10-15 14:13:56 s 1 +142978.79 0 +273135.35 5420.0 C57
2021-10-15 14:23:56 S 02 53 21.026 +12 04 51.17 V C57
2021-10-15 14:23:56 s 1 +142726.66 8 +273613.74 6520.0 C57
2021-10-15 14:33:56 S 02 53 20.808 +12 04 41.02 V C57
2021-10-15 14:33:56 s 1 +142473.87 1 +274090.84 5380.0 C57
2021-10-15 14:43:56 S 02 53 20.717 +12 04 34.28 V C57
2021-10-15 14:43:56 s 1 +142220.40 3 +274566.64 2010.0 C57
2021-10-15 14:53:56 S 02 53 20.626 +12 04 27.48 V C57
2021-10-15 14:53:56 s 1 +141966.26 7 +275041.16 6410.0 C57
2021-10-15 15:03:56 S 02 53 20.544 +12 04 17.58 V C57
2021-10-15 15:03:56 s 1 +141711.46 6 +275514.38 8610.0 C57
2021-10-15 15:13:56 S 02 53 20.042 +12 04 08.62 V C57
2021-10-15 15:13:56 s 1 +141456.00 2 +275986.32 8610.0 C57
2021-10-15 15:23:56 S 02 53 20.170 +12 04 03.11 V C57
2021-10-15 15:23:56 s 1 +141199.87 9 +276456.97 6410.0 C57
2021-10-15 15:33:56 S 02 53 20.088 +12 03 52.13 V C57
2021-10-15 15:33:56 s 1 +140943.10 0 +276926.34 2040.0 C57
2021-10-15 15:43:56 S 02 53 19.740 +12 03 45.65 V C57
2021-10-15 15:43:56 s 1 +140685.66 7 +277394.42 5500.0 C57
2021-10-15 15:53:56 S 02 53 19.781 +12 03 37.98 V C57
2021-10-15 15:53:56 s 1 +140427.58 4 +277861.22 6790.0 C57
2021-10-15 16:03:56 S 02 53 19.591 +12 03 28.66 V C57
2021-10-15 16:03:56 s 1 +140168.85 3 +278326.74 5940.0 C57
2021-10-15 16:13:56 S 02 53 19.543 +12 03 21.85 V C57
2021-10-15 16:13:56 s 1 +139909.47 8 +278790.98 2950.0 C57
2021-10-15 16:23:56 S 02 53 19.411 +12 03 11.27 V C57
2021-10-15 16:23:56 s 1 +139649.46 2 +279253.95 7820.0 C57
2021-10-15 16:33:56 S 02 53 19.116 +12 03 02.59 V C57
2021-10-15 16:33:56 s 1 +139388.80 7 +279715.63 580.0 C57
2021-10-15 16:43:56 S 02 53 19.157 +12 02 57.95 V C57
2021-10-15 16:43:56 s 1 +139127.51 5 +280176.04 1230.0 C57
2021-10-15 16:53:56 S 02 53 18.842 +12 02 47.69 V C57
2021-10-15 16:53:56 s 1 +138865.59 1 +280635.18 9780.0 C57
2021-10-15 18:23:56 S 02 53 17.532 +12 01 35.83 V C57
2021-10-15 18:23:56 s 1 +136480.25 8 +284710.24 3760.0 C57
2021-10-15 22:13:56 S 02 53 14.443 +11 58 21.68 V C57
2021-10-15 22:13:56 s 1 +130166.28 8 +294661.91 140.0 C57
2021-10-15 22:23:56 S 02 53 14.251 +11 58 15.56 V C57
2021-10-15 22:23:56 s 1 +129884.99 9 +295079.67 4540.0 C57
2021-10-15 22:33:56 S 02 53 14.232 +11 58 03.25 V C57
2021-10-15 22:33:56 s 1 +129603.16 8 +295496.20 7150.0 C57
2021-10-15 22:43:56 S 02 53 13.874 +11 57 55.58 V C57
2021-10-15 22:43:56 s 1 +129320.79 5 +295911.49 7970.0 C57
2021-10-15 22:53:56 S 02 53 13.730 +11 57 44.39 V C57
2021-10-15 22:53:56 s 1 +129037.88 5 +296325.56 7020.0 C57
2021-10-15 23:03:56 S 02 53 13.639 +11 57 39.49 V C57
2021-10-15 23:03:56 s 1 +128754.43 8 +296738.39 4290.0 C57
2021-10-15 23:13:56 S 02 53 13.457 +11 57 31.97 V C57
2021-10-15 23:13:56 s 1 +128470.45 9 +297149.99 9800.0 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)