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
2017-03-13 01:58:23 C 05 58 51.96 +19 58 08.0 q H45
2017-03-13 01:59:56 C 05 58 52.00 +19 58 08.1 q H45
2017-03-13 02:01:47 C 05 58 52.04 +19 58 08.2 q H45
2017-03-13 02:03:32 C 05 58 52.09 +19 58 08.6 q H45
2017-03-14 08:55:09 C 05 59 39.01 +20 02 02.4 L T05
2017-03-14 09:07:37 C 05 59 39.34 +20 02 03.3 L T05
2017-03-14 09:10:44 C 05 59 39.44 +20 02 03.5 L T05
2017-03-14 09:24:08 C 05 59 39.79 +20 02 06.0 L T05
2017-03-14 09:42:27 C 05 59 40.22 +20 02 08.3 L T05
2017-03-14 13:19:20 C 05 59 46.01 +20 02 34.5 q D29
2017-03-14 13:36:14 C 05 59 46.43 +20 02 36.6 q D29
2017-03-14 13:53:09 C 05 59 46.86 +20 02 38.6 q D29
2017-03-14 15:22:50 C 05 59 49.20 +20 02 48.7 o C94
2017-03-14 15:39:57 C 05 59 49.65 +20 02 51.1 o C94
2017-03-19 02:58:19 C 06 02 51.94 +20 15 44.2 q H45
2017-03-19 02:59:51 C 06 02 51.99 +20 15 44.5 q H45
2017-03-19 03:01:17 C 06 02 52.04 +20 15 44.6 q H45
2017-03-19 03:02:42 C 06 02 52.08 +20 15 44.7 q H45
2017-03-19 03:04:16 C 06 02 52.12 +20 15 44.9 q H45
2017-03-19 03:05:47 C 06 02 52.17 +20 15 45.4 q H45
2017-03-21 06:38:34 C 06 04 28.58 +20 21 37.5 L T05
2017-03-21 06:55:53 C 06 04 29.19 +20 21 39.0 L T05
2017-03-21 07:11:49 C 06 04 29.69 +20 21 41.0 L T05
2017-03-21 07:29:46 C 06 04 30.26 +20 21 43.0 L T05
2017-03-24 04:09:06 C 06 06 47.20 +20 29 07.9 q H45
2017-03-24 04:11:03 C 06 06 47.31 +20 29 08.5 q H45
2017-03-24 04:12:34 C 06 06 47.38 +20 29 08.6 q H45
2017-03-24 04:14:10 C 06 06 47.38 +20 29 08.7 q H45
2017-03-24 04:15:45 C 06 06 47.45 +20 29 08.8 q H45
2017-03-24 04:17:03 C 06 06 47.49 +20 29 09.1 q H45
2017-03-25 07:02:53 C 06 07 43.50 +20 31 58.3 L T05
2017-03-25 07:19:43 C 06 07 44.10 +20 31 58.9 L T05
2017-03-25 07:40:34 C 06 07 44.81 +20 32 01.6 L T05
2017-03-25 08:07:34 C 06 07 45.79 +20 32 03.6 L T05
2017-03-25 12:32:35 C 06 07 55.19 +20 32 30.0 q D29
2017-03-25 12:55:29 C 06 07 55.98 +20 32 32.9 q D29
2017-03-25 13:18:23 C 06 07 56.79 +20 32 35.3 q D29
2017-03-27 18:52:28 C 06 09 53.68 +20 37 56.4 q 160
2017-03-27 18:54:24 C 06 09 53.75 +20 37 56.7 q 160
2017-03-27 18:56:19 C 06 09 53.81 +20 37 56.9 q 160
2017-03-29 06:30:33 C 06 11 14.19 +20 41 22.8 L T05
2017-03-29 06:48:39 C 06 11 14.93 +20 41 24.0 L T05
2017-03-29 07:05:13 C 06 11 15.54 +20 41 26.2 L T05
2017-03-29 07:23:21 C 06 11 16.20 +20 41 28.1 L T05
2017-03-29 07:39:55 C 06 11 16.92 +20 41 28.9 L T05
2017-03-30 18:48:42 C 06 12 38.80 +20 44 43.3 q 160
2017-03-30 18:50:45 C 06 12 38.88 +20 44 43.2 q 160
2017-03-30 18:52:49 C 06 12 38.96 +20 44 43.4 q 160
2017-03-31 18:59:27 C 06 13 36.37 +20 46 52.7 q 160
2017-03-31 19:00:36 C 06 13 36.40 +20 46 53.1 q 160
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)