Helin-Roman-Alu 1 (117P)

⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2014-02-26 (JD 2456714.5)
Eccentricity (e)0.2538337241 ± 2.57e-08
Semi-major axis (a)4.0960656353 AU ± 4.93e-08
Inclination (i)8.69758109° ± 3.51e-06
Long. of Asc. Node (Ω)58.89809332° ± 2.37e-05
Arg. of Perihelion (ω)222.68743629° ± 2.40e-05
Mean Anomaly (M)356.52961813° ± 8.43e-06
Mean Motion (n)0.1188945412°/day ± 2.15e-09
Perihelion dist (q)3.05634604 AU ± 1.11e-07
Aphelion dist (Q)5.13578523 AU ± 1.22e-07
Orbital Period8.28992041 yr ± 1.50e-07
NGA Modelg(r)
A12.76205343e-07 ± 9.62e-10 AU/d²
A27.56837885e-08 ± 1.10e-10 AU/d²
A33.93094122e-08 ± 1.47e-09 AU/d²
Orbit Solution
SourceIAA
Solution Date2026-05-30
RMS Residual0.928″
Uncertainty0
Orbit TypeMBA
MOID2.046067 AU
Observations Used6678
Oppositions33
Arc Total1988-2025
First Observation Used1988-08-10
Last Observation Used2025-12-27
Observations (6963)
Date Type RA Dec Mag Band Observatory
2005-07-30 20:46:59 C 15 24 29.20 -21 05 43.6 – c J79
2005-07-30 20:48:02 C 15 24 29.23 -21 05 44.3 – c J79
2005-07-30 20:51:11 C 15 24 29.18 -21 05 43.4 – c J79
2005-07-31 02:12:32 C 15 24 34.40 -21 06 23.8 – c 844
2005-07-31 02:15:53 C 15 24 34.46 -21 06 23.8 – c 844
2005-07-31 02:42:31 C 15 24 34.96 -21 06 27.0 – c 844
2005-07-31 22:10:16 C 15 24 56.13 -21 08 51.0 – r I77
2005-07-31 22:42:08 C 15 24 57.08 -21 08 57.7 – r I77
2005-07-31 23:06:04 C 15 24 57.61 -21 09 00.4 – r I77
2005-08-01 10:12:13 C 15 25 10.13 -21 10 23.5 – o 415
2005-08-01 10:14:19 C 15 25 10.16 -21 10 23.6 – o 415
2005-08-01 14:17:39 C 15 25 14.81 -21 10 54.4 – c 320
2005-08-01 14:20:43 C 15 25 14.89 -21 10 54.8 – c 320
2005-08-01 14:23:47 C 15 25 14.93 -21 10 55.1 – c 320
2005-08-01 14:26:49 C 15 25 15.00 -21 10 55.5 – c 320
2005-08-01 21:57:10 C 15 25 23.73 -21 11 56.1 – c 945
2005-08-01 22:08:09 C 15 25 23.94 -21 11 57.6 – c 945
2005-08-01 22:14:26 C 15 25 24.03 -21 11 58.4 – c 945
2005-08-03 20:41:49 C 15 26 20.89 -21 17 57.9 – c 939
2005-08-03 20:48:27 C 15 26 21.02 -21 17 58.8 – c 939
2005-08-03 20:55:05 C 15 26 21.15 -21 17 59.4 – c 939
2005-08-04 20:31:57 C 15 26 51.69 -21 21 06.7 – r J97
2005-08-05 11:19:30 C 15 27 11.42 -21 23 04.8 – m 349
2005-08-05 11:21:52 C 15 27 11.51 -21 23 05.2 – m 349
2005-08-05 20:05:06 C 15 27 23.44 -21 24 16.1 – d 442
2005-08-05 20:05:57 C 15 27 23.34 -21 24 17.0 – d 442
2005-08-05 21:14:37 C 15 27 24.86 -21 24 25.8 – c 939
2005-08-05 21:21:15 C 15 27 25.00 -21 24 26.3 – c 939
2005-08-05 21:27:54 C 15 27 25.14 -21 24 26.6 – c 939
2005-08-07 23:15:54 C 15 28 35.79 -21 31 13.7 – r I77
2005-08-07 23:32:34 C 15 28 36.22 -21 31 15.4 – – 834
2005-08-07 23:38:13 C 15 28 36.31 -21 31 17.0 – r I77
2005-08-07 23:59:10 C 15 28 36.83 -21 31 19.5 – r I77
2005-08-08 00:10:56 C 15 28 37.14 -21 31 20.7 – – 834
2005-08-10 23:33:38 C 15 30 27.08 -21 41 27.3 – – 834
2005-08-11 00:18:01 C 15 30 28.22 -21 41 33.6 – – 834
2005-08-15 21:30:48 C 15 33 49.96 -21 58 55.9 – r I77
2005-08-15 21:46:13 C 15 33 50.41 -21 58 58.1 – r I77
2005-08-15 21:59:56 C 15 33 50.83 -21 59 00.1 – r I77
2005-08-16 10:58:04 C 15 34 14.84 -22 00 57.2 – r E12
2005-08-16 11:09:03 C 15 34 15.13 -22 00 58.1 – r E12
2005-08-16 11:20:12 C 15 34 15.34 -22 00 59.8 – r E12
2005-08-16 11:31:30 C 15 34 15.67 -22 01 02.5 – r E12
2005-08-22 22:30:01 C 15 39 24.23 -22 25 19.1 – r I77
2005-08-22 22:45:35 C 15 39 24.74 -22 25 21.9 – r I77
2005-08-22 23:02:10 C 15 39 25.67 -22 25 26.5 – r I77
2005-08-25 09:56:12 C 15 41 33.72 -22 34 53.4 – r E12
2005-08-25 10:10:31 C 15 41 34.15 -22 34 55.4 – r E12
2005-08-25 10:24:53 C 15 41 34.69 -22 34 58.0 – r E12
2005-08-25 10:39:14 C 15 41 35.19 -22 35 00.7 – r E12