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
2007-03-16 20:01:45 C 06 54 48.01 +21 12 52.2 c A24
2007-03-16 20:16:43 C 06 54 48.19 +21 12 53.3 c A24
2007-03-16 20:18:10 C 06 54 48.19 +21 12 54.2 c A24
2007-03-16 20:25:51 C 06 54 48.28 +21 12 54.5 c A24
2007-03-16 20:35:00 C 06 54 48.36 +21 12 55.5 c A24
2007-03-16 20:42:41 C 06 54 48.46 +21 12 55.8 c A24
2007-03-16 20:44:08 C 06 54 48.42 +21 12 56.1 c A24
2007-03-16 20:51:50 C 06 54 48.53 +21 12 56.9 c A24
2007-03-16 21:00:59 C 06 54 48.62 +21 12 57.9 c A24
2007-03-16 21:08:41 C 06 54 48.70 +21 12 59.3 c A24
2007-03-16 21:10:09 C 06 54 48.82 +21 12 59.3 c A24
2007-03-16 21:14:11 C 06 54 48.783 +21 12 57.9 r 084
2007-03-16 21:17:21 C 06 54 48.888 +21 12 58.7 r 084
2007-03-16 21:42:07 C 06 54 48.98 +21 13 01.2 c A24
2007-03-28 22:17:13 C 07 00 00.263 +21 34 42.9 r 084
2007-04-06 19:34:38 C 07 06 01.66 +21 44 36.9 c A24
2007-04-06 19:36:06 C 07 06 01.69 +21 44 37.0 c A24
2007-04-06 19:58:26 C 07 06 02.39 +21 44 37.6 c A24
2007-04-06 20:22:13 C 07 06 03.13 +21 44 38.3 c A24
2007-04-06 20:44:33 C 07 06 03.84 +21 44 38.9 c A24
2007-04-06 20:46:01 C 07 06 03.85 +21 44 39.2 c A24
2007-04-06 21:08:21 C 07 06 04.60 +21 44 39.5 c A24
2007-04-06 21:32:08 C 07 06 05.35 +21 44 39.9 c A24
2007-04-06 21:54:28 C 07 06 06.08 +21 44 40.3 c A24
2007-04-06 21:55:56 C 07 06 06.10 +21 44 40.1 c A24
2007-04-06 22:11:21 C 07 06 06.60 +21 44 40.7 c A24
2007-04-08 19:54:38 C 07 07 37.13 +21 46 07.4 c A24
2007-04-08 19:56:05 C 07 07 37.16 +21 46 07.2 c A24
2007-04-08 20:17:07 C 07 07 37.87 +21 46 07.9 c A24
2007-04-08 20:38:21 C 07 07 38.592 +21 46 07.0 r 084
2007-04-08 20:39:37 C 07 07 38.60 +21 46 08.5 c A24
2007-04-08 20:42:31 C 07 07 38.730 +21 46 07.0 r 084
2007-04-08 21:00:39 C 07 07 39.34 +21 46 09.2 c A24
2007-04-08 21:02:07 C 07 07 39.34 +21 46 08.7 c A24
2007-04-09 19:39:37 C 07 08 25.75 +21 46 45.7 c A24
2007-04-09 19:41:02 C 07 08 25.79 +21 46 45.6 c A24
2007-04-09 20:00:55 C 07 08 26.47 +21 46 46.2 c A24
2007-04-09 20:22:12 C 07 08 27.18 +21 46 46.6 c A24
2007-04-09 20:42:04 C 07 08 27.86 +21 46 47.1 c A24
2007-04-09 20:43:29 C 07 08 27.92 +21 46 47.0 c A24
2007-04-09 20:54:38 C 07 08 28.273 +21 46 45.8 r 084
2007-04-09 20:58:49 C 07 08 28.439 +21 46 46.3 r 084
2007-04-10 19:41:58 C 07 09 16.10 +21 47 20.3 c A24
2007-04-10 19:43:26 C 07 09 16.20 +21 47 20.2 c A24
2007-04-10 20:46:06 C 07 09 18.29 +21 47 21.5 c A24
2007-04-10 20:47:34 C 07 09 18.38 +21 47 21.6 c A24
2007-04-11 19:46:46 C 07 10 07.65 +21 47 51.1 c A24
2007-04-11 19:48:14 C 07 10 07.68 +21 47 51.1 c A24
2007-04-11 20:17:05 C 07 10 08.72 +21 47 51.5 c A24
2007-04-11 20:47:23 C 07 10 09.79 +21 47 52.0 c A24
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)