IAA RAS IAA Minor Planet Database

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
2021-10-16 03:43:56 S 02 53 10.037 +11 53 42.76 – V C57
2021-10-16 03:43:56 s 1 +120609.86 7 +307802.46 1520.0 – C57
2021-10-16 03:53:56 S 02 53 09.725 +11 53 33.72 – V C57
2021-10-16 03:53:56 s 1 +120311.88 6 +308180.07 870.0 – C57
2021-10-16 04:03:56 S 02 53 09.559 +11 53 24.83 – V C57
2021-10-16 04:03:56 s 1 +120013.43 6 +308556.48 8690.0 – C57
2021-10-16 04:13:56 S 02 53 09.530 +11 53 17.41 – V C57
2021-10-16 04:13:56 s 1 +119714.52 1 +308931.70 4980.0 – C57
2021-10-16 04:23:56 S 02 53 09.338 +11 53 08.16 – V C57
2021-10-16 04:23:56 s 1 +119415.14 2 +309305.72 9740.0 – C57
2021-10-16 04:33:56 S 02 53 09.254 +11 52 58.55 – V C57
2021-10-16 04:33:56 s 1 +119115.30 1 +309678.54 2980.0 – C57
2021-10-16 04:43:56 S 02 53 09.204 +11 52 49.91 – V C57
2021-10-16 04:43:56 s 1 +118815.00 0 +310050.16 4720.0 – C57
2021-10-16 04:53:56 S 02 53 08.875 +11 52 42.56 – V C57
2021-10-16 04:53:56 s 1 +118514.24 2 +310420.60 4950.0 – C57
2021-10-16 05:03:56 S 02 53 08.875 +11 52 31.19 – V C57
2021-10-16 05:03:56 s 1 +118213.02 9 +310789.84 3680.0 – C57
2021-10-16 05:13:56 S 02 53 08.676 +11 52 23.70 – V C57
2021-10-16 05:13:56 s 1 +117911.36 2 +311157.88 920.0 – C57
2021-10-16 05:23:56 S 02 53 08.570 +11 52 15.46 – V C57
2021-10-16 05:23:56 s 1 +117609.24 3 +311524.74 6690.0 – C57
2021-10-16 05:33:56 S 02 53 08.527 +11 52 06.17 – V C57
2021-10-16 05:33:56 s 1 +117306.67 5 +311890.40 970.0 – C57
2021-10-16 05:43:56 S 02 53 08.234 +11 51 58.68 – V C57
2021-10-16 05:43:56 s 1 +117003.66 0 +312254.88 3790.0 – C57
2021-10-16 05:53:56 S 02 53 08.246 +11 51 50.51 – V C57
2021-10-16 05:53:56 s 1 +116700.20 0 +312618.17 5150.0 – C57
2021-10-16 06:13:05 C 02 54 20.27 +11 39 48.8 – V 703
2021-10-16 06:20:45 C 02 54 20.27 +11 39 42.9 – V 703
2021-10-16 06:30:01 C 02 54 20.30 +11 39 35.5 – V 703
2021-10-16 06:39:19 C 02 54 20.29 +11 39 28.0 – V 703
2021-10-16 07:03:56 S 02 53 07.370 +11 50 46.75 – V C57
2021-10-16 07:03:56 s 1 +114563.67 9 +315127.98 4300.0 – C57
2021-10-16 07:08:36 C 02 54 20.23 +11 39 05.2 – V V21
2021-10-16 07:30:58 C 02 54 20.23 +11 38 47.5 – V V21
2021-10-16 08:11:11 C 02 54 20.21 +11 38 14.6 – V V21
2021-10-16 12:13:56 S 02 53 03.084 +11 46 13.76 – V C57
2021-10-16 12:13:56 s 1 +104858.06 3 +325551.47 9780.0 – C57
2021-10-16 12:23:56 S 02 53 03.113 +11 46 03.83 – V C57
2021-10-16 12:23:56 s 1 +104538.74 2 +325869.11 9290.0 – C57
2021-10-16 13:23:56 S 02 53 02.213 +11 45 08.96 – V C57
2021-10-16 13:23:56 s 1 +102615.10 3 +327750.75 1250.0 – C57
2021-10-16 13:53:56 S 02 53 01.766 +11 44 43.91 – V C57
2021-10-16 13:53:56 s 1 +101648.40 6 +328676.05 1390.0 – C57
2021-10-16 14:03:56 S 02 53 01.685 +11 44 35.45 – V C57
2021-10-16 14:03:56 s 1 +101325.46 2 +328982.19 9120.0 – C57
2021-10-16 15:23:56 S 02 53 00.509 +11 43 22.12 – V C57
2021-10-16 15:23:56 s 1 +98729.347 0 +331390.11 260.0 – C57
2021-10-16 16:53:56 S 02 52 59.455 +11 42 00.14 – 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)