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 14:53:56 s 1 -104369.77 2 +324444.52 7410.0 C57
2021-10-20 15:03:56 S 02 52 15.194 +09 59 48.80 V C57
2021-10-20 15:03:56 s 1 -104689.42 1 +324120.96 8150.0 C57
2021-10-20 15:13:56 S 02 52 15.180 +09 59 37.43 V C57
2021-10-20 15:13:56 s 1 -105008.69 7 +323796.24 7480.0 C57
2021-10-20 15:23:56 S 02 52 15.233 +09 59 25.01 V C57
2021-10-20 15:23:56 s 1 -105327.59 8 +323470.35 5410.0 C57
2021-10-20 15:33:56 S 02 52 15.182 +09 59 12.08 V C57
2021-10-20 15:33:56 s 1 -105646.12 1 +323143.29 1920.0 C57
2021-10-20 15:43:56 S 02 52 15.163 +09 58 59.92 V C57
2021-10-20 15:43:56 s 1 -105964.26 5 +322815.07 7000.0 C57
2021-10-20 15:53:56 S 02 52 15.127 +09 58 48.29 V C57
2021-10-20 15:53:56 s 1 -106282.02 8 +322485.68 670.0 C57
2021-10-20 16:03:56 S 02 52 15.199 +09 58 35.62 V C57
2021-10-20 16:03:56 s 1 -106599.40 9 +322155.12 2890.0 C57
2021-10-20 16:13:56 S 02 52 15.286 +09 58 23.09 V C57
2021-10-20 16:13:56 s 1 -106916.40 5 +321823.38 3680.0 C57
2021-10-20 16:23:56 S 02 52 15.163 +09 58 10.74 V C57
2021-10-20 16:23:56 s 1 -107233.01 5 +321490.48 3020.0 C57
2021-10-20 16:33:56 S 02 52 15.254 +09 57 56.99 V C57
2021-10-20 16:33:56 s 1 -107549.23 7 +321156.41 910.0 C57
2021-10-20 16:43:56 S 02 52 15.238 +09 57 45.40 V C57
2021-10-20 16:43:56 s 1 -107865.06 8 +320821.16 7340.0 C57
2021-10-20 16:53:56 S 02 52 15.386 +09 57 33.05 V C57
2021-10-20 16:53:56 s 1 -108180.50 8 +320484.73 2310.0 C57
2021-10-20 17:03:56 S 02 52 15.410 +09 57 18.97 V C57
2021-10-20 17:03:56 s 1 -108495.55 4 +320147.14 5800.0 C57
2021-10-20 17:13:56 S 02 52 15.379 +09 57 06.98 V C57
2021-10-20 17:13:56 s 1 -108810.20 5 +319808.37 7810.0 C57
2021-10-20 17:23:56 S 02 52 15.326 +09 56 56.11 V C57
2021-10-20 17:23:56 s 1 -109124.45 8 +319468.42 8340.0 C57
2021-10-20 17:33:56 S 02 52 15.343 +09 56 42.14 V C57
2021-10-20 17:33:56 s 1 -109438.31 2 +319127.29 7370.0 C57
2021-10-20 17:43:56 S 02 52 15.302 +09 56 30.55 V C57
2021-10-20 17:43:56 s 1 -109751.76 5 +318784.99 4910.0 C57
2021-10-20 17:53:56 S 02 52 15.454 +09 56 18.31 V C57
2021-10-20 17:53:56 s 1 -110064.81 4 +318441.50 940.0 C57
2021-10-20 18:03:56 S 02 52 15.492 +09 56 04.88 V C57
2021-10-20 18:03:56 s 1 -110377.45 9 +318096.84 5460.0 C57
2021-10-20 18:13:56 S 02 52 15.442 +09 55 53.04 V C57
2021-10-20 18:13:56 s 1 -110689.69 6 +317751.00 8460.0 C57
2021-10-20 18:23:56 S 02 52 15.353 +09 55 39.18 V C57
2021-10-20 18:23:56 s 1 -111001.52 5 +317403.97 9930.0 C57
2021-10-20 18:33:56 S 02 52 15.514 +09 55 28.31 V C57
2021-10-20 18:33:56 s 1 -111312.94 3 +317055.76 9870.0 C57
2021-10-20 18:43:56 S 02 52 15.482 +09 55 14.74 V C57
2021-10-20 18:43:56 s 1 -111623.94 9 +316706.37 8280.0 C57
2021-10-20 18:53:56 S 02 52 15.475 +09 55 01.24 V C57
2021-10-20 18:53:56 s 1 -111934.53 9 +316355.79 5130.0 C57
2021-10-20 19:03:56 S 02 52 15.470 +09 54 47.99 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)