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
2013-06-13 23:47:03 C 22 15 54.61 +06 34 34.1 q B17
2013-06-13 23:50:02 C 22 15 55.20 +06 34 35.1 q B17
2013-06-13 23:53:02 C 22 15 55.79 +06 34 36.0 q B17
2013-06-13 23:56:03 C 22 15 56.39 +06 34 37.0 q B17
2013-06-18 10:52:28 C 22 37 32.48 +07 03 12.8 u 703
2013-06-18 10:53:25 C 22 37 32.70 +07 03 13.1 u 703
2013-06-18 10:54:23 C 22 37 32.88 +07 03 13.2 u 703
2013-06-18 10:55:22 C 22 37 33.06 +07 03 13.4 u 703
2013-06-18 10:56:19 C 22 37 33.24 +07 03 13.7 u 703
2013-07-07 00:44:52 C 00 04 03.95 +07 12 07.3 r Z69
2013-07-07 00:45:18 C 00 04 03.99 +07 12 07.7 r Z69
2013-07-07 01:44:48 C 00 04 14.52 +07 11 57.7 r Z69
2013-07-07 01:45:13 C 00 04 14.59 +07 11 57.7 r Z69
2013-07-07 02:55:14 C 00 04 26.90 +07 11 45.7 r Z69
2013-07-07 02:55:39 C 00 04 26.97 +07 11 45.7 r Z69
2013-07-07 04:11:51 C 00 04 40.25 +07 11 32.3 r Z69
2013-07-07 04:12:17 C 00 04 40.32 +07 11 32.4 r Z69
2013-07-17 23:43:53 C 00 48 04.29 +05 58 20.3 12.0 u 089
2013-07-17 23:44:57 C 00 48 04.45 +05 58 19.8 12.1 u 089
2013-07-17 23:46:00 C 00 48 04.61 +05 58 19.5 12.1 u 089
2013-07-18 05:25:57 C 00 48 56.93 +05 56 41.2 r Y00
2013-07-18 05:28:22 C 00 48 57.29 +05 56 40.2 r Y00
2013-07-18 05:30:47 C 00 48 57.64 +05 56 39.3 r Y00
2013-07-23 06:18:31 C 01 06 37.89 +05 06 28.0 r Y00
2013-07-23 06:22:38 C 01 06 38.45 +05 06 26.2 r Y00
2013-07-23 06:26:40 C 01 06 38.98 +05 06 24.2 r Y00
2013-07-31 00:51:13 C 01 30 34.63 +03 32 29.7 11.6 u 089
2013-07-31 00:52:17 C 01 30 34.75 +03 32 29.1 11.5 u 089
2013-07-31 00:53:21 C 01 30 34.87 +03 32 28.6 11.6 u 089
2013-07-31 00:54:25 C 01 30 34.99 +03 32 28.0 11.5 u 089
2013-07-31 00:55:29 C 01 30 35.10 +03 32 27.6 11.5 u 089
2013-07-31 00:56:33 C 01 30 35.22 +03 32 26.9 11.6 u 089
2013-07-31 00:57:37 C 01 30 35.34 +03 32 26.3 11.6 u 089
2013-07-31 00:58:41 C 01 30 35.46 +03 32 25.7 11.7 u 089
2013-07-31 01:03:43 C 01 30 36.03 +03 32 23.0 12.0 u 089
2013-07-31 01:34:12 C 01 30 39.55 +03 32 10.0 q A84
2013-07-31 01:35:27 C 01 30 39.69 +03 32 09.3 q A84
2013-07-31 01:36:44 C 01 30 39.83 +03 32 08.5 q A84
2013-07-31 01:38:00 C 01 30 39.97 +03 32 07.9 q A84
2013-07-31 01:39:41 C 01 30 40.16 +03 32 06.9 q A84
2013-07-31 01:40:52 C 01 30 40.29 +03 32 06.3 q A84
2013-07-31 01:42:04 C 01 30 40.42 +03 32 05.7 q A84
2013-07-31 01:43:17 C 01 30 40.56 +03 32 05.0 q A84
2013-07-31 01:44:30 C 01 30 40.69 +03 32 04.3 q A84
2013-07-31 01:45:43 C 01 30 40.83 +03 32 03.7 q A84
2013-07-31 01:46:56 C 01 30 40.96 +03 32 03.0 q A84
2013-07-31 01:48:08 C 01 30 41.09 +03 32 02.3 q A84
2013-07-31 01:49:23 C 01 30 41.23 +03 32 01.7 q A84
2013-07-31 01:50:35 C 01 30 41.37 +03 32 01.0 q A84
2013-07-31 01:51:48 C 01 30 41.50 +03 32 00.3 q A84
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)