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
2025-10-22 23:27:25 B 03 38 49.62 +11 17 26.5 V R53
2025-10-22 23:30:27 B 03 38 49.82 +11 17 23.3 V R53
2025-10-24 08:33:25 C 03 41 18.002 +10 39 45.50 V 703
2025-10-24 08:36:40 C 03 41 18.208 +10 39 41.76 V 703
2025-10-24 08:39:55 C 03 41 18.413 +10 39 37.84 V 703
2025-10-24 08:43:10 C 03 41 18.618 +10 39 34.06 V 703
2025-10-25 00:46:35 C 03 42 33.694 +10 20 46.68 V M22
2025-10-25 00:51:48 C 03 42 34.030 +10 20 39.88 V M22
2025-10-25 01:41:56 C 03 42 37.308 +10 19 35.58 V M22
2025-10-25 02:22:53 C 03 42 40.037 +10 18 42.66 V M22
2025-10-25 08:06:01 C 03 43 10.366 +10 10 17.80 V 703
2025-10-25 08:09:21 C 03 43 10.585 +10 10 13.48 V 703
2025-10-25 08:12:40 C 03 43 10.801 +10 10 09.19 V 703
2025-10-25 08:16:00 C 03 43 11.017 +10 10 04.62 V 703
2025-10-26 08:33:36 C 03 45 11.743 +09 37 08.36 V 703
2025-10-26 08:36:52 C 03 45 11.948 +09 37 03.58 V 703
2025-10-26 08:40:07 C 03 45 12.172 +09 36 59.08 V 703
2025-10-26 08:43:23 C 03 45 12.402 +09 36 54.54 V 703
2025-10-27 06:33:58 C 03 47 08.668 +09 04 50.12 V 703
2025-10-27 06:37:13 C 03 47 08.916 +09 04 45.12 V 703
2025-10-27 06:40:28 C 03 47 09.168 +09 04 40.58 V 703
2025-10-27 06:43:44 C 03 47 09.402 +09 04 35.47 V 703
2025-10-27 18:21:48 C 03 48 09.76 +08 46 30.2 V D29
2025-10-27 18:42:10 C 03 48 11.29 +08 45 57.6 V D29
2025-10-27 19:02:32 C 03 48 12.84 +08 45 24.9 V D29
2025-10-27 22:45:48 C 03 48 36.240 +08 40 41.30 V M22
2025-10-27 22:48:30 C 03 48 36.446 +08 40 36.91 V M22
2025-10-27 22:53:09 C 03 48 36.806 +08 40 29.53 V M22
2025-10-27 23:06:49 C 03 48 37.836 +08 40 07.50 V M22
2025-10-28 07:13:30 C 03 49 24.136 +08 25 37.60 V 703
2025-10-28 07:17:20 C 03 49 24.424 +08 25 31.15 V 703
2025-10-28 07:21:10 C 03 49 24.726 +08 25 24.78 V 703
2025-10-28 07:25:00 C 03 49 25.014 +08 25 18.55 V 703
2025-10-28 17:21:51 C 03 50 21.04 +08 08 28.2 V D29
2025-10-28 17:42:13 C 03 50 22.66 +08 07 53.0 V D29
2025-10-28 18:02:35 C 03 50 24.28 +08 07 17.8 V D29
2025-10-28 19:20:16 C 03 50 30.631 +08 06 08.42 V P07
2025-10-28 19:51:51 C 03 50 33.175 +08 05 13.02 V P07
2025-10-28 20:29:21 C 03 50 36.242 +08 04 06.78 V P07
2025-10-28 20:29:29 C 03 50 36.257 +08 04 06.42 V P07
2025-10-28 20:51:27 C 03 50 38.095 +08 03 27.68 V P07
2025-10-29 07:54:38 C 03 51 48.258 +07 42 44.68 V G96
2025-10-29 08:02:07 C 03 51 48.881 +07 42 31.10 V G96
2025-10-29 08:09:37 C 03 51 49.504 +07 42 17.53 V G96
2025-10-29 08:17:04 C 03 51 50.123 +07 42 04.07 V G96
2025-10-29 19:26:24 C 03 52 56.251 +07 22 29.50 V P07
2025-10-29 19:51:23 C 03 52 58.399 +07 21 41.40 V P07
2025-10-29 20:25:34 C 03 53 01.414 +07 20 35.59 V P07
2025-10-29 20:44:20 C 03 53 03.086 +07 19 59.77 V P07
2025-10-30 07:43:52 C 03 54 17.600 +06 57 31.50 V 703
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)