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
2016-12-19 10:58:42 C 06 47 47.13 +14 31 38.0 u H21
2016-12-19 11:00:46 C 06 47 47.02 +14 31 38.3 u H21
2016-12-19 11:02:50 C 06 47 46.90 +14 31 38.5 u H21
2016-12-19 11:04:54 C 06 47 46.79 +14 31 39.0 u H21
2016-12-19 11:06:58 C 06 47 46.66 +14 31 39.3 u H21
2016-12-19 11:08:37 C 06 47 46.57 +14 31 39.5 u H21
2016-12-22 05:47:42 C 06 44 00.92 +14 40 52.3 q V83
2016-12-22 06:12:47 C 06 43 59.47 +14 40 55.6 q V83
2016-12-22 06:25:10 C 06 43 58.75 +14 40 57.5 q V83
2016-12-22 06:38:58 C 06 43 57.93 +14 40 59.4 q V83
2016-12-22 06:48:21 C 06 43 57.39 +14 41 00.9 q V83
2016-12-22 12:09:19 C 06 43 38.91 +14 41 48.6 L T05
2016-12-22 12:18:11 C 06 43 38.39 +14 41 49.7 L T05
2016-12-22 12:50:00 C 06 43 36.53 +14 41 54.4 L T05
2016-12-22 12:52:56 C 06 43 36.35 +14 41 54.7 L T05
2016-12-23 00:04:37 C 06 42 58.04 +14 43 29.4 q 160
2016-12-23 00:06:40 C 06 42 57.92 +14 43 29.6 q 160
2016-12-23 00:08:42 C 06 42 57.80 +14 43 29.9 q 160
2016-12-24 00:58:36 C 06 41 32.03 +14 47 08.1 q 160
2016-12-24 01:00:34 C 06 41 31.90 +14 47 08.0 q 160
2016-12-24 01:02:32 C 06 41 31.79 +14 47 08.6 q 160
2016-12-27 06:41:09 C 06 37 01.95 +14 58 58.6 R G45
2016-12-27 06:48:32 C 06 37 01.56 +14 58 59.8 R G45
2016-12-27 07:09:07 C 06 37 00.30 +14 59 02.8 R G45
2016-12-27 07:16:44 C 06 36 59.85 +14 59 03.8 R G45
2016-12-27 07:32:10 C 06 36 58.91 +14 59 06.3 R G45
2016-12-27 07:38:47 C 06 36 58.54 +14 59 07.3 R G45
2016-12-27 16:30:43 C 06 36 27.51 +15 00 30.5 q Q11
2016-12-27 16:35:29 C 06 36 27.24 +15 00 31.4 q Q11
2016-12-27 16:40:46 C 06 36 26.91 +15 00 32.1 q Q11
2016-12-28 23:14:21 C 06 34 40.54 +15 05 22.6 q 160
2016-12-28 23:16:16 C 06 34 40.42 +15 05 22.9 q 160
2016-12-28 23:18:10 C 06 34 40.30 +15 05 23.2 q 160
2016-12-29 06:23:11 C 06 34 15.70 +15 06 32.3 R G45
2016-12-29 06:30:42 C 06 34 15.24 +15 06 33.2 R G45
2016-12-29 06:38:31 C 06 34 14.79 +15 06 34.7 R G45
2016-12-29 06:46:00 C 06 34 14.33 +15 06 35.8 R G45
2016-12-29 06:53:34 C 06 34 13.89 +15 06 37.1 R G45
2016-12-29 07:00:52 C 06 34 13.46 +15 06 38.3 R G45
2016-12-29 09:07:30 C 06 34 05.89 +15 06 58.2 q H45
2016-12-29 09:09:06 C 06 34 05.77 +15 06 58.3 q H45
2016-12-29 09:10:52 C 06 34 05.70 +15 06 58.7 q H45
2016-12-29 09:12:14 C 06 34 05.61 +15 06 58.8 q H45
2016-12-29 09:13:56 C 06 34 05.50 +15 06 59.1 q H45
2016-12-29 09:15:10 C 06 34 05.42 +15 06 59.2 q H45
2016-12-30 08:42:00 C 06 32 43.99 +15 10 47.7 q H15
2016-12-30 08:55:52 C 06 32 43.13 +15 10 50.0 q H15
2016-12-30 09:10:52 C 06 32 42.27 +15 10 52.5 q H15
2016-12-30 22:21:36 C 06 31 56.80 +15 13 01.4 16.3 v K63
2016-12-30 22:38:26 C 06 31 55.73 +15 13 04.5 16.2 v K63
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)