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
2005-03-16 19:42:55 C 10 42 59.35 +16 43 34.2 c 127
2005-03-16 19:50:21 C 10 42 58.97 +16 43 37.4 c 127
2005-03-16 19:57:51 C 10 42 58.53 +16 43 40.5 c 127
2005-03-18 04:30:52 C 10 41 18.05 +16 56 56.0 z 294
2005-03-18 04:43:34 C 10 41 17.31 +16 57 01.0 z 294
2005-03-18 05:04:33 C 10 41 16.26 +16 57 09.5 z 294
2005-03-19 01:29:39 C 10 40 14.54 +17 05 14.3 z 294
2005-03-19 01:44:46 C 10 40 13.80 +17 05 20.2 z 294
2005-03-19 02:02:36 C 10 40 12.83 +17 05 27.1 z 294
2005-03-20 07:03:21 C 10 38 45.66 +17 16 37.8 r H45
2005-03-20 07:04:49 C 10 38 45.57 +17 16 38.3 r H45
2005-03-20 07:06:06 C 10 38 45.52 +17 16 39.1 r H45
2005-03-20 07:07:23 C 10 38 45.44 +17 16 39.2 r H45
2005-03-20 07:08:35 C 10 38 45.40 +17 16 39.8 r H45
2005-03-20 21:34:43 C 10 38 03.07 +17 22 03.7 c 113
2005-03-20 21:36:19 C 10 38 03.01 +17 22 04.5 c 113
2005-03-20 21:37:54 C 10 38 02.93 +17 22 04.7 c 113
2005-03-20 21:39:29 C 10 38 02.84 +17 22 05.8 c 113
2005-03-20 21:41:04 C 10 38 02.77 +17 22 06.1 c 113
2005-03-20 21:42:39 C 10 38 02.67 +17 22 06.9 c 113
2005-03-20 21:52:31 C 10 38 02.06 +17 22 09.3 o 084
2005-03-20 21:56:09 C 10 38 01.90 +17 22 10.4 o 084
2005-03-21 22:24:00 C 10 36 50.69 +17 31 07.8 o 084
2005-03-21 22:27:39 C 10 36 50.53 +17 31 09.0 o 084
2005-03-22 21:36:46 C 10 35 44.41 +17 39 23.5 o 084
2005-03-22 21:40:29 C 10 35 44.23 +17 39 24.5 o 084
2005-03-26 21:55:42 C 10 31 23.30 +18 10 53.7 o 084
2005-03-26 21:59:22 C 10 31 23.18 +18 10 54.8 o 084
2005-03-28 21:16:32 C 10 29 24.39 +18 24 42.5 o 084
2005-03-28 21:20:10 C 10 29 24.23 +18 24 43.8 o 084
2005-03-29 22:56:38 C 10 28 22.62 +18 31 43.6 o 084
2005-03-29 23:00:16 C 10 28 22.47 +18 31 44.5 o 084
2005-03-30 21:02:04 C 10 27 31.31 +18 37 30.2 o 084
2005-03-30 21:05:42 C 10 27 31.14 +18 37 30.7 o 084
2005-03-31 11:57:33 C 10 26 57.64 +18 41 18.7 r 379
2005-03-31 12:00:51 C 10 26 57.50 +18 41 19.5 r 379
2005-03-31 12:02:31 C 10 26 57.41 +18 41 19.6 r 379
2005-03-31 12:04:09 C 10 26 57.35 +18 41 20.3 r 379
2005-03-31 21:01:09 C 10 26 37.27 +18 43 29.5 o 084
2005-03-31 21:04:47 C 10 26 37.12 +18 43 30.4 o 084
2005-04-01 20:20:09 C 10 25 46.76 +18 49 03.2 c 127
2005-04-01 20:28:12 C 10 25 46.47 +18 49 05.0 c 127
2005-04-01 20:36:18 C 10 25 46.16 +18 49 06.9 c 127
2005-04-01 20:49:06 C 10 25 45.68 +18 49 09.8 c 127
2005-04-01 21:02:18 C 10 25 45.08 +18 49 11.5 r 084
2005-04-02 05:17:14 C 10 25 27.73 +18 51 07.7 o 699
2005-04-02 05:50:01 C 10 25 26.50 +18 51 15.2 o 699
2005-04-02 06:22:46 C 10 25 25.30 +18 51 22.5 o 699
2005-04-02 06:35:02 C 10 25 24.81 +18 51 25.5 r 703
2005-04-02 06:46:35 C 10 25 24.37 +18 51 28.0 r 703
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)