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
2015-05-12 02:02:11 C 09 19 54.85 +20 22 35.4 u H21
2015-05-12 03:36:52 C 09 19 58.44 +20 22 21.4 q 703
2015-05-12 03:42:40 C 09 19 58.67 +20 22 20.4 q 703
2015-05-12 03:48:29 C 09 19 58.89 +20 22 19.5 q 703
2015-05-12 03:54:17 C 09 19 59.11 +20 22 18.4 q 703
2015-05-12 17:57:42 C 09 20 31.65 +20 20 09.2 o K95
2015-05-12 19:02:26 C 09 20 34.11 +20 19 58.4 o K95
2015-05-12 19:03:59 C 09 20 34.16 +20 19 58.2 o K95
2015-05-13 01:59:10 C 09 20 50.41 +20 18 46.9 u H21
2015-05-13 02:00:44 C 09 20 50.46 +20 18 46.9 u H21
2015-05-13 02:02:42 C 09 20 50.53 +20 18 46.5 u H21
2015-05-13 02:03:53 C 09 20 50.57 +20 18 46.2 u H21
2015-05-13 02:05:15 C 09 20 50.63 +20 18 46.2 u H21
2015-05-13 02:06:26 C 09 20 50.67 +20 18 45.8 u H21
2015-05-13 20:08:12 C 09 21 33.28 +20 15 48.6 q 160
2015-05-13 20:10:59 C 09 21 33.39 +20 15 48.5 q 160
2015-05-13 20:13:49 C 09 21 33.50 +20 15 48.2 q 160
2015-05-14 01:42:29 C 09 21 46.65 +20 14 54.2 u H21
2015-05-14 01:45:25 C 09 21 46.77 +20 14 53.5 u H21
2015-05-14 01:48:22 C 09 21 46.88 +20 14 53.2 u H21
2015-05-14 01:51:18 C 09 21 46.98 +20 14 52.8 u H21
2015-05-14 01:53:50 C 09 21 47.06 +20 14 52.4 u H21
2015-05-14 01:56:28 C 09 21 47.17 +20 14 51.9 u H21
2015-05-19 01:53:05 C 09 26 49.10 +19 53 32.6 u H21
2015-05-19 01:56:01 C 09 26 49.21 +19 53 31.9 u H21
2015-05-19 01:58:57 C 09 26 49.32 +19 53 31.2 u H21
2015-05-19 02:01:54 C 09 26 49.45 +19 53 30.7 u H21
2015-05-19 02:04:50 C 09 26 49.56 +19 53 30.0 u H21
2015-05-19 02:07:19 C 09 26 49.67 +19 53 29.6 u H21
2015-05-19 02:09:51 C 09 26 49.78 +19 53 29.1 u H21
2015-05-22 04:26:53 C 09 30 10.73 +19 38 53.4 q 703
2015-05-22 04:34:07 C 09 30 11.07 +19 38 51.8 q 703
2015-05-22 04:41:22 C 09 30 11.39 +19 38 50.2 q 703
2015-05-22 04:48:38 C 09 30 11.73 +19 38 48.7 q 703
2015-05-27 02:00:02 C 09 35 49.04 +19 13 40.7 q H21
2015-05-27 02:02:43 C 09 35 49.18 +19 13 39.9 q H21
2015-05-27 02:05:24 C 09 35 49.31 +19 13 39.4 q H21
2015-05-27 02:08:05 C 09 35 49.44 +19 13 38.9 q H21
2015-05-27 02:10:46 C 09 35 49.57 +19 13 38.2 q H21
2015-05-27 02:13:28 C 09 35 49.70 +19 13 37.6 q H21
2015-05-27 02:16:09 C 09 35 49.83 +19 13 37.0 q H21
2015-05-28 02:06:26 C 09 37 01.29 +19 08 12.0 q H21
2015-05-28 02:10:33 C 09 37 01.49 +19 08 10.9 q H21
2015-05-28 02:14:41 C 09 37 01.70 +19 08 09.8 q H21
2015-05-28 02:18:49 C 09 37 01.90 +19 08 08.9 q H21
2015-05-28 02:22:57 C 09 37 02.11 +19 08 08.0 q H21
2015-05-28 02:27:05 C 09 37 02.32 +19 08 07.1 q H21
2015-05-28 02:31:13 C 09 37 02.52 +19 08 06.2 q H21
2015-05-29 02:12:48 C 09 38 14.46 +19 02 36.5 u H21
2015-05-29 02:14:52 C 09 38 14.57 +19 02 36.5 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)