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
1999-09-16 10:50:13 C 03 26 42.84 -06 58 11.5 848
1999-09-16 10:52:26 C 03 26 43.13 -06 58 16.8 848
1999-09-19 11:17:23 C 03 35 00.41 -09 45 29.8 848
1999-09-19 11:22:25 C 03 35 00.83 -09 45 42.9 848
1999-09-20 12:03:00 C 03 37 46.07 -10 43 24.8 c 658
1999-09-20 12:07:41 C 03 37 46.58 -10 43 35.7 c 658
1999-09-20 12:15:27 C 03 37 47.40 -10 43 54.0 c 658
1999-10-02 02:39:46 C 04 06 00.41 -21 30 56.2 595
1999-10-02 02:43:07 C 04 06 00.82 -21 31 04.6 595
1999-10-02 03:06:59 C 04 06 02.82 -21 31 58.3 595
1999-10-02 03:14:50 C 04 06 03.44 -21 32 15.8 595
1999-10-02 03:18:53 C 04 06 03.91 -21 32 24.9 595
1999-10-04 17:28:34 C 04 11 30.28 -23 49 23.9 z 428
1999-11-03 13:59:11 C 04 45 44.79 -42 24 25.2 z 428
1999-11-03 14:07:50 C 04 45 45.02 -42 24 32.3 z 428
1999-12-05 13:53:11 C 04 36 25.69 -44 49 16.1 z 428
1999-12-05 14:07:03 C 04 36 25.32 -44 49 09.3 z 428
2001-08-13 04:08:06 C 16 51 48.36 +11 49 19.5 o 644
2003-03-31 08:08:34 C 15 00 36.707 +09 53 18.50 e 645
2003-03-31 08:13:34 C 15 00 36.576 +09 53 22.47 21.99 e 645
2005-03-03 06:07:13 C 11 52 13.51 +01 52 57.8 c 691
2005-03-03 06:44:56 C 11 52 11.76 +01 53 33.1 c 691
2005-03-03 07:21:34 C 11 52 10.10 +01 54 07.5 c 691
2005-03-04 09:50:13 C 11 50 59.12 +02 18 57.6 c 691
2005-03-04 10:20:12 C 11 50 57.70 +02 19 25.1 c 691
2005-03-04 10:48:31 C 11 50 56.42 +02 19 51.9 c 691
2005-03-08 05:59:58 C 11 46 45.80 +03 46 02.7 o 699
2005-03-08 06:27:57 C 11 46 44.49 +03 46 27.9 o 699
2005-03-08 06:56:01 C 11 46 43.27 +03 46 55.6 o 699
2005-03-08 07:24:03 C 11 46 41.77 +03 47 22.3 o 699
2005-03-12 08:15:36 C 11 42 07.36 +05 18 48.7 20.2 c 704
2005-03-12 08:32:15 C 11 42 06.53 +05 19 04.7 20.4 c 704
2005-03-12 08:48:07 C 11 42 05.72 +05 19 20.7 19.8 c 704
2005-03-12 09:03:59 C 11 42 04.96 +05 19 35.3 19.7 c 704
2005-03-16 07:11:49 C 11 37 37.69 +06 46 47.4 19.9 c 704
2005-03-16 07:28:37 C 11 37 36.83 +06 47 03.1 19.9 c 704
2005-03-16 07:44:58 C 11 37 35.98 +06 47 18.1 19.9 c 704
2005-03-16 08:01:07 C 11 37 35.25 +06 47 32.7 19.7 c 704
2005-06-01 04:45:27 C 11 25 51.39 +17 06 17.5 n 645
2005-06-01 04:50:14 C 11 25 51.54 +17 06 17.1 n 645
2007-01-10 15:15:02 C 06 11 51.00 -30 27 54.8 r E12
2007-01-10 15:32:34 C 06 11 50.35 -30 27 34.6 r E12
2007-01-10 15:50:01 C 06 11 49.92 -30 27 15.0 r E12
2007-01-10 16:07:30 C 06 11 49.41 -30 26 54.5 r E12
2008-05-27 08:38:47 C 18 32 02.64 +20 36 21.2 o H55
2008-05-27 08:51:44 C 18 32 02.28 +20 36 28.2 o H55
2008-05-27 09:02:47 C 18 32 01.98 +20 36 34.9 o H55
2010-04-20 12:57:41 C 15 12 59.604 +15 31 06.51 L F51
2010-04-20 13:10:25 C 15 12 59.061 +15 31 15.18 L F51
2010-05-11 07:26:51 C 14 49 19.325 +19 54 04.72 L F51