16912 Rhiannon (1998 EP8)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2726846060 ± 4.13e-08
Semi-major axis (a)1.7512387014 AU ± 2.64e-09
Inclination (i)24.52113807° ± 5.04e-06
Long. of Asc. Node (Ω)169.16090010° ± 8.02e-06
Arg. of Perihelion (ω)221.25693507° ± 1.24e-05
Mean Anomaly (M)94.77700479° ± 1.34e-05
Mean Motion (n)0.4252988973°/day ± 9.63e-10
Perihelion dist (q)1.27370287 AU ± 7.23e-08
Aphelion dist (Q)2.22877454 AU ± 7.24e-08
Orbital Period2.31749080 yr ± 5.25e-09
Physical Parameters
H (abs. magnitude)17.89
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.329″
Uncertainty0
Orbit TypeAmor
MOID0.319695 AU
Observations Used298
Oppositions18
Arc Total1992-2024
First Observation Used1992-08-29
Last Observation Used2024-06-29
Observations (303)
Date Type RA Dec Mag Band Observatory
1992-08-29 08:57:00 00 22 50.36 +09 15 10.8 261
1992-08-29 09:56:59 00 22 53.42 +09 13 09.1 261
1998-02-25 11:06:42 C 11 19 34.21 -00 50 14.2 c 566
1998-02-25 11:21:08 C 11 19 33.53 -00 49 59.8 c 566
1998-02-25 11:36:03 C 11 19 32.80 -00 49 45.8 c 566
1998-03-02 22:07:50 C 11 13 24.54 +01 17 52.6 z 910
1998-03-02 22:41:08 C 11 13 22.90 +01 18 25.9 z 910
1998-03-02 23:14:14 C 11 13 21.26 +01 18 58.2 z 910
1998-03-05 10:21:55 C 11 10 30.91 +02 17 35.2 658
1998-03-05 10:31:33 C 11 10 30.40 +02 17 44.5 658
1998-03-05 10:37:50 C 11 10 30.16 +02 17 51.2 658
1998-03-06 06:37:40 C 11 09 33.11 +02 37 40.0 658
1998-03-06 06:42:42 C 11 09 32.94 +02 37 44.5 658
1998-03-06 06:52:38 C 11 09 32.40 +02 37 55.0 658
1998-03-08 08:21:57 C 11 07 10.70 +03 26 48.6 a 696
1998-03-08 08:27:31 C 11 07 10.42 +03 26 53.8 a 696
1998-03-08 08:33:08 C 11 07 10.13 +03 26 59.6 a 696
1999-09-14 09:12:14 C 03 20 53.01 -05 05 58.0 18.5 a 704
1999-09-14 09:30:20 C 03 20 55.08 -05 06 38.5 18.7 a 704
1999-09-14 09:48:26 C 03 20 57.17 -05 07 18.5 19.0 a 704
1999-09-14 10:06:45 C 03 20 59.25 -05 07 59.7 19.1 a 704
1999-09-14 10:25:08 C 03 21 01.34 -05 08 40.7 18.6 a 704
1999-09-14 23:25:46 C 03 22 34.32 -05 37 54.6 d 046
1999-09-14 23:27:27 C 03 22 34.48 -05 37 58.8 d 046
1999-09-14 23:29:17 C 03 22 34.68 -05 38 03.1 d 046
1999-09-14 23:30:47 C 03 22 34.87 -05 38 06.4 d 046
1999-09-15 00:47:05 C 03 22 43.62 -05 40 59.1 557
1999-09-15 00:48:55 C 03 22 43.86 -05 41 03.5 557
1999-09-15 00:50:48 C 03 22 44.04 -05 41 07.4 557
1999-09-15 03:00:30 C 03 22 58.84 -05 45 59.1 c 118
1999-09-15 03:04:59 C 03 22 59.38 -05 46 09.0 c 118
1999-09-15 03:06:33 C 03 22 59.56 -05 46 12.9 c 118
1999-09-15 11:00:55 C 03 23 55.73 -06 04 02.7 848
1999-09-15 11:03:08 C 03 23 55.99 -06 04 08.6 848
1999-09-15 11:07:46 C 03 23 56.48 -06 04 18.3 848
1999-09-15 11:07:47 C 03 23 56.47 -06 04 19.1 c 658
1999-09-15 11:08:45 C 03 23 56.25 -06 04 17.5 z 711
1999-09-15 11:10:41 C 03 23 56.81 -06 04 25.5 c 658
1999-09-15 11:14:48 C 03 23 56.85 -06 04 31.5 z 711
1999-09-15 11:16:36 C 03 23 57.46 -06 04 38.9 c 658
1999-09-15 11:20:53 C 03 23 57.60 -06 04 45.2 z 711
1999-09-16 01:58:42 C 03 25 40.85 -06 37 59.6 595
1999-09-16 02:02:35 C 03 25 41.27 -06 38 09.3 595
1999-09-16 02:07:40 C 03 25 41.76 -06 38 20.1 595
1999-09-16 02:17:25 C 03 25 42.91 -06 38 43.4 c 118
1999-09-16 02:22:08 C 03 25 43.44 -06 38 55.3 c 118
1999-09-16 02:31:45 C 03 25 44.50 -06 39 16.7 c 118
1999-09-16 10:42:15 C 03 26 42.03 -06 57 53.1 848
1999-09-16 10:44:25 C 03 26 42.29 -06 57 58.6 848
1999-09-16 10:46:39 C 03 26 42.50 -06 58 03.5 848