1627 Ivar (1929 SH)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3973228500 ± 3.37e-09
Semi-major axis (a)1.8630580824 AU ± 4.99e-10
Inclination (i)8.45629236° ± 2.99e-07
Long. of Asc. Node (Ω)133.07459963° ± 2.39e-06
Arg. of Perihelion (ω)167.83961943° ± 2.63e-06
Mean Anomaly (M)311.46100560° ± 6.93e-07
Mean Motion (n)0.3875901077°/day ± 1.56e-10
Perihelion dist (q)1.12282254 AU ± 6.29e-09
Aphelion dist (Q)2.60329363 AU ± 6.32e-09
Orbital Period2.54296037 yr ± 1.02e-09
NGA Modelr2
A2-5.33141704e-16 ± 5.07e-16 AU/d²
Physical Parameters
H (abs. magnitude)12.79
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.120″
Uncertainty0
Orbit TypeAmor
MOID0.108765 AU
Observations Used13532
Radar Obs Used4
Gaia Obs Used222
Oppositions53
Arc Total1929-2025
First Observation Used1929-09-25
Last Observation Used2025-06-15
Observations (18178)
Date Type RA Dec Mag Band Observatory
2010-03-16 21:09:57 C 09 53 07.63 +18 53 58.7 15.7 u 084
2010-03-16 21:13:07 C 09 53 07.49 +18 53 59.6 15.6 u 084
2010-03-17 00:05:38 C 09 53 00.02 +18 54 49.8 15.9 u 084
2010-03-17 04:07:22 C 09 52 50.08 +18 56 03.7 r 703
2010-03-17 04:18:06 C 09 52 49.58 +18 56 05.9 r 703
2010-03-17 04:28:45 C 09 52 49.18 +18 56 08.6 r 703
2010-03-17 04:39:25 C 09 52 48.75 +18 56 11.5 r 703
2010-03-17 05:18:36 C 09 52 47.00 +18 56 24.6 c 704
2010-03-17 05:34:38 C 09 52 46.30 +18 56 29.6 c 704
2010-03-17 05:50:31 C 09 52 45.60 +18 56 34.3 c 704
2010-03-17 06:22:30 C 09 52 44.20 +18 56 43.1 c 704
2010-03-17 11:17:08 C 09 52 32.03 +18 58 07.0 u D95
2010-03-17 11:20:13 C 09 52 31.89 +18 58 08.3 u D95
2010-03-17 11:23:19 C 09 52 31.73 +18 58 09.2 u D95
2010-03-17 11:26:23 C 09 52 31.62 +18 58 10.7 u D95
2010-03-17 20:47:59 C 09 52 08.01 +19 00 49.0 15.7 u 084
2010-03-19 05:06:06 C 09 50 49.16 +19 09 50.1 r G96
2010-03-19 05:14:40 C 09 50 48.80 +19 09 52.4 r G96
2010-03-19 05:23:22 C 09 50 48.44 +19 09 54.8 r G96
2010-03-19 05:31:53 C 09 50 48.08 +19 09 57.1 r G96
2010-03-20 11:54:27 C 09 49 36.86 +19 17 58.8 u D95
2010-03-20 11:57:32 C 09 49 36.71 +19 17 59.2 u D95
2010-03-20 12:03:42 C 09 49 36.52 +19 18 01.4 u D95
2010-03-22 18:26:12 C 09 47 36.12 +19 31 23.6 15.9 u 084
2010-03-22 18:29:21 C 09 47 36.01 +19 31 24.3 15.9 u 084
2010-03-23 20:46:57 C 09 46 41.15 +19 37 26.7 15.8 u 084
2010-03-23 21:50:55 C 09 46 38.81 +19 37 42.2 15.9 u C20
2010-03-23 21:53:02 C 09 46 38.74 +19 37 42.7 15.9 u C20
2010-03-23 22:38:23 C 09 46 37.27 +19 37 51.4 15.7 u 084
2010-03-24 18:21:50 C 09 45 58.05 +19 42 12.3 15.7 u C20
2010-03-24 18:23:56 C 09 45 57.98 +19 42 12.8 15.8 u C20
2010-03-24 20:45:04 C 09 45 53.26 +19 42 41.6 15.8 u 084
2010-03-24 20:48:14 C 09 45 53.16 +19 42 42.3 15.8 u 084
2010-03-25 18:07:44 C 09 45 12.37 +19 47 11.4 15.9 u C20
2010-03-28 22:22:21 C 09 42 58.82 +20 01 35.2 15.6 u C20
2010-03-28 22:24:28 C 09 42 58.75 +20 01 35.6 15.6 u C20
2010-03-30 03:13:52 C 09 42 14.11 +20 06 26.2 r H53
2010-03-30 03:18:52 C 09 42 13.96 +20 06 27.0 r H53
2010-03-30 03:23:53 C 09 42 13.85 +20 06 27.5 r H53
2010-03-30 03:28:52 C 09 42 13.71 +20 06 28.2 r H53
2010-03-30 03:33:53 C 09 42 13.46 +20 06 29.9 r H53
2010-03-30 03:40:09 C 09 42 13.38 +20 06 30.5 r H53
2010-03-30 20:16:16 C 09 41 48.86 +20 09 05.7 15.5 o 084
2010-03-31 22:27:03 C 09 41 12.22 +20 12 58.8 15.6 u 084
2010-03-31 22:30:12 C 09 41 12.16 +20 12 59.2 15.6 u 084
2010-03-31 23:00:35 C 09 41 11.35 +20 13 04.1 15.7 u C20
2010-03-31 23:02:42 C 09 41 11.28 +20 13 04.5 15.7 u C20
2010-04-01 00:05:38 C 09 41 09.85 +20 13 13.0 16.4 u C20
2010-04-01 00:07:45 C 09 41 09.83 +20 13 13.5 16.1 u C20
2010-04-01 20:11:49 C 09 40 43.94 +20 16 00.7 16.4 u 084
Radar Observations (6)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1985-07-08 08:00:00 20560 6 Hz 2380 -1 -1
1985-07-08.333333 2056000 600 Hz 2380 251 251
1985-07-09 08:09:00 202574571 16 us 2380 -1 -1
1985-07-09.339583 20257457100 16000 us 2380 251 251
2013-06-27 09:40:00 323904701.64 5 us 2380 -1 -1
2013-07-04 09:14:00 321083718.18 5 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)