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
2013-11-19 03:59:33 C 01 24 59.30 -10 05 54.1 u H21
2013-11-19 04:02:52 C 01 24 59.28 -10 05 52.4 u H21
2013-11-19 04:06:56 C 01 24 59.27 -10 05 50.5 u H21
2013-11-19 04:10:14 C 01 24 59.26 -10 05 48.9 u H21
2013-11-19 04:14:33 C 01 24 59.25 -10 05 46.8 u H21
2013-11-19 04:17:51 C 01 24 59.23 -10 05 45.1 u H21
2013-11-20 18:33:07 C 01 25 00.75 -09 46 50.5 o C41
2013-11-20 18:34:55 C 01 25 00.75 -09 46 49.8 o C41
2013-11-20 18:36:23 C 01 25 00.76 -09 46 48.9 o C41
2013-11-21 14:06:14 C 01 25 03.24 -09 37 01.3 o 300
2013-11-21 14:07:33 C 01 25 03.34 -09 37 00.5 o 300
2013-11-21 14:08:51 C 01 25 03.30 -09 36 59.9 o 300
2013-11-21 14:10:08 C 01 25 03.34 -09 36 58.4 o 300
2013-11-21 14:11:27 C 01 25 03.27 -09 36 58.7 o 300
2013-11-21 14:12:45 C 01 25 03.25 -09 36 56.9 o 300
2013-11-22 19:54:40 C 01 25 10.59 -09 21 55.3 r 006
2013-11-22 20:04:24 C 01 25 10.64 -09 21 50.3 r 006
2013-11-22 20:14:58 C 01 25 10.65 -09 21 45.3 r 006
2013-11-24 00:14:30 C 01 25 19.60 -09 07 24.4 q J93
2013-11-24 00:19:22 C 01 25 19.61 -09 07 21.8 q J93
2013-11-24 00:23:17 C 01 25 19.64 -09 07 19.6 q J93
2013-11-24 18:29:05 C 01 25 27.43 -08 57 57.1 o C41
2013-11-24 18:30:38 C 01 25 27.45 -08 57 56.3 o C41
2013-11-24 18:32:06 C 01 25 27.45 -08 57 55.6 o C41
2013-11-25 19:00:19 C 01 25 39.71 -08 45 08.6 u J37
2013-11-25 19:03:56 C 01 25 39.76 -08 45 07.3 u J37
2013-11-25 19:12:09 C 01 25 39.84 -08 45 02.8 u J37
2013-11-25 19:42:17 C 01 25 40.03 -08 44 47.0 u J37
2013-11-27 04:05:02 C 01 25 58.75 -08 27 43.6 q 703
2013-11-27 04:16:39 C 01 25 58.90 -08 27 37.4 q 703
2013-11-27 04:28:14 C 01 25 58.93 -08 27 31.7 q 703
2013-11-27 04:39:50 C 01 25 59.06 -08 27 25.5 q 703
2013-12-01 20:02:04 C 01 27 30.58 -07 27 39.8 q J93
2013-12-01 20:10:19 C 01 27 30.71 -07 27 35.5 q J93
2013-12-01 20:21:27 C 01 27 30.88 -07 27 29.2 q J93
2013-12-03 18:14:47 C 01 28 19.76 -07 02 24.4 q 089
2013-12-03 18:16:55 C 01 28 19.80 -07 02 23.4 q 089
2013-12-03 18:19:03 C 01 28 19.84 -07 02 22.1 q 089
2013-12-03 18:21:11 C 01 28 19.87 -07 02 20.9 q 089
2013-12-03 18:23:19 C 01 28 19.92 -07 02 19.8 q 089
2013-12-03 18:25:27 C 01 28 19.94 -07 02 18.8 q 089
2013-12-03 18:27:35 C 01 28 19.99 -07 02 17.5 q 089
2013-12-03 18:29:43 C 01 28 20.02 -07 02 16.2 q 089
2013-12-03 18:31:51 C 01 28 20.05 -07 02 15.0 q 089
2013-12-03 18:33:59 C 01 28 20.09 -07 02 13.9 q 089
2013-12-03 18:36:07 C 01 28 20.13 -07 02 12.7 q 089
2013-12-03 18:38:15 C 01 28 20.17 -07 02 11.6 q 089
2013-12-03 18:40:23 C 01 28 20.21 -07 02 10.4 q 089
2013-12-03 18:42:31 C 01 28 20.24 -07 02 09.4 q 089
2013-12-03 18:44:39 C 01 28 20.28 -07 02 08.0 q 089
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)