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
2013-10-30 18:36:59 C 01 32 32.63 -13 12 18.9 q A84
2013-10-30 18:38:27 C 01 32 32.58 -13 12 18.4 q A84
2013-10-30 18:39:53 C 01 32 32.53 -13 12 18.0 q A84
2013-10-30 18:41:22 C 01 32 32.48 -13 12 17.6 q A84
2013-10-30 18:42:49 C 01 32 32.42 -13 12 17.2 q A84
2013-10-30 18:44:18 C 01 32 32.37 -13 12 16.9 q A84
2013-10-30 18:45:44 C 01 32 32.32 -13 12 16.5 q A84
2013-10-30 18:47:13 C 01 32 32.26 -13 12 16.1 q A84
2013-10-30 18:48:40 C 01 32 32.22 -13 12 15.7 q A84
2013-10-30 18:50:07 C 01 32 32.16 -13 12 15.2 q A84
2013-10-30 18:51:34 C 01 32 32.12 -13 12 14.9 q A84
2013-10-30 18:53:03 C 01 32 32.06 -13 12 14.5 q A84
2013-10-30 18:54:29 C 01 32 32.01 -13 12 14.0 q A84
2013-10-30 18:55:58 C 01 32 31.96 -13 12 13.7 q A84
2013-10-30 18:57:25 C 01 32 31.91 -13 12 13.3 q A84
2013-10-30 22:04:46 C 01 32 25.58 -13 11 23.9 t G33
2013-10-30 22:13:37 C 01 32 25.27 -13 11 21.1 t G33
2013-10-30 22:19:02 C 01 32 25.08 -13 11 19.2 t G33
2013-10-30 22:31:18 C 01 32 24.66 -13 11 16.0 t G33
2013-10-30 22:42:36 C 01 32 24.24 -13 11 13.2 t G33
2013-11-03 02:20:18 C 01 30 10.84 -12 47 49.9 u X14
2013-11-03 02:33:12 C 01 30 10.49 -12 47 45.4 u X14
2013-11-03 02:40:10 C 01 30 10.28 -12 47 42.9 u X14
2013-11-03 02:45:37 C 01 30 10.09 -12 47 41.3 u X14
2013-11-05 13:41:08 C 01 28 42.42 -12 27 30.7 o 300
2013-11-05 13:42:27 C 01 28 42.42 -12 27 30.6 o 300
2013-11-05 13:43:45 C 01 28 42.34 -12 27 29.7 o 300
2013-11-05 13:47:39 C 01 28 42.30 -12 27 28.1 o 300
2013-11-05 13:50:15 C 01 28 42.18 -12 27 27.3 o 300
2013-11-08 04:58:43 C 01 27 24.87 -12 03 29.8 V G45
2013-11-08 05:22:45 C 01 27 24.39 -12 03 20.2 V G45
2013-11-08 05:44:04 C 01 27 23.94 -12 03 11.7 V G45
2013-11-08 06:14:11 C 01 27 23.29 -12 02 59.8 V G45
2013-11-09 00:40:00 C 01 27 03.81 -11 55 40.0 q J93
2013-11-09 00:43:10 C 01 27 03.77 -11 55 38.6 q J93
2013-11-09 00:46:18 C 01 27 03.75 -11 55 36.7 q J93
2013-11-10 04:46:11 C 01 26 37.55 -11 44 05.4 q 703
2013-11-10 04:53:25 C 01 26 37.42 -11 44 02.5 q 703
2013-11-10 05:00:42 C 01 26 37.30 -11 43 59.5 q 703
2013-11-10 05:07:58 C 01 26 37.17 -11 43 56.4 q 703
2013-11-13 11:44:20 C 01 25 40.17 -11 09 54.3 o 300
2013-11-13 11:45:08 C 01 25 40.07 -11 09 54.4 o 300
2013-11-13 11:45:56 C 01 25 40.09 -11 09 54.5 o 300
2013-11-13 11:46:45 C 01 25 40.03 -11 09 54.0 o 300
2013-11-14 04:14:21 C 01 25 31.03 -11 02 29.4 u H21
2013-11-14 04:18:28 C 01 25 30.99 -11 02 27.5 u H21
2013-11-14 04:22:20 C 01 25 30.94 -11 02 25.8 u H21
2013-11-14 04:26:11 C 01 25 30.89 -11 02 24.0 u H21
2013-11-14 04:30:03 C 01 25 30.86 -11 02 22.2 u H21
2013-11-14 04:35:12 C 01 25 30.79 -11 02 19.9 u H21
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)