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
2021-09-24 04:13:58 s 1 -89020.745 0 +345916.21 9630.0 C57
2021-09-24 04:23:58 S 06 28 25.663 +14 56 14.21 V C57
2021-09-24 04:23:58 s 1 -89368.653 0 +345683.98 8510.0 C57
2021-09-24 04:33:58 S 06 28 26.054 +14 56 12.44 V C57
2021-09-24 04:33:58 s 1 -89716.284 0 +345450.66 6390.0 C57
2021-09-24 04:43:58 S 06 28 26.501 +14 56 11.58 V C57
2021-09-24 04:43:58 s 1 -90063.637 0 +345216.25 3290.0 C57
2021-09-24 04:53:58 S 06 28 26.995 +14 56 08.23 V C57
2021-09-24 04:53:58 s 1 -90410.709 0 +344980.75 9180.0 C57
2021-09-24 05:03:58 S 06 28 27.312 +14 56 07.94 V C57
2021-09-24 05:03:58 s 1 -90757.501 0 +344744.16 4080.0 C57
2021-09-24 05:13:58 S 06 28 27.850 +14 56 05.60 V C57
2021-09-24 05:13:58 s 1 -91104.011 0 +344506.47 7960.0 C57
2021-09-24 06:03:58 S 06 28 29.986 +14 56 01.21 V C57
2021-09-24 06:03:58 s 1 -92832.269 0 +343301.61 2120.0 C57
2021-09-24 06:13:58 S 06 28 30.271 +14 55 57.40 V C57
2021-09-24 06:13:58 s 1 -93177.054 0 +343057.36 9870.0 C57
2021-09-24 06:23:58 S 06 28 30.713 +14 55 58.04 V C57
2021-09-24 06:23:58 s 1 -93521.545 0 +342812.01 6570.0 C57
2021-09-24 06:33:58 S 06 28 31.219 +14 55 57.47 V C57
2021-09-24 06:33:58 s 1 -93865.743 0 +342565.56 2230.0 C57
2021-09-24 06:43:58 S 06 28 31.469 +14 55 56.35 V C57
2021-09-24 06:43:58 s 1 -94209.646 0 +342318.01 6840.0 C57
2021-09-24 06:53:58 S 06 28 32.014 +14 55 53.47 V C57
2021-09-24 06:53:58 s 1 -94553.252 0 +342069.37 400.0 C57
2021-09-24 07:03:58 S 06 28 32.424 +14 55 52.86 V C57
2021-09-24 07:03:58 s 1 -94896.559 0 +341819.63 2890.0 C57
2021-09-24 07:13:58 S 06 28 32.981 +14 55 54.55 V C57
2021-09-24 07:13:58 s 1 -95239.567 0 +341568.79 4330.0 C57
2021-09-24 08:33:58 S 06 28 36.118 +14 55 40.91 V C57
2021-09-24 08:33:58 s 1 -97972.664 0 +339522.47 6900.0 C57
2021-09-24 08:53:58 S 06 28 36.816 +14 55 37.92 V C57
2021-09-24 08:53:58 s 1 -98652.839 0 +338999.88 9060.0 C57
2021-09-24 09:03:58 S 06 28 37.246 +14 55 34.03 V C57
2021-09-24 09:03:58 s 1 -98992.453 0 +338736.93 8470.0 C57
2021-09-24 09:13:58 S 06 28 37.706 +14 55 37.24 V C57
2021-09-24 09:13:58 s 1 -99331.750 0 +338472.87 6750.0 C57
2021-09-24 09:23:58 S 06 28 38.165 +14 55 33.96 V C57
2021-09-24 09:23:58 s 1 -99670.728 0 +338207.71 3910.0 C57
2021-09-24 09:33:58 S 06 28 38.611 +14 55 30.72 V C57
2021-09-24 09:33:58 s 1 -100009.38 5 +337941.44 9930.0 C57
2021-09-24 09:43:58 S 06 28 38.894 +14 55 32.38 V C57
2021-09-24 09:43:58 s 1 -100347.72 1 +337674.07 4810.0 C57
2021-09-24 09:53:58 S 06 28 39.430 +14 55 30.54 V C57
2021-09-24 09:53:58 s 1 -100685.73 3 +337405.59 8560.0 C57
2021-09-24 10:03:58 S 06 28 39.864 +14 55 27.77 V C57
2021-09-24 10:03:58 s 1 -101023.42 0 +337136.00 1150.0 C57
2021-09-24 10:13:58 S 06 28 40.337 +14 55 32.84 V C57
2021-09-24 10:13:58 s 1 -101360.78 1 +336865.31 2590.0 C57
2021-09-24 10:53:58 S 06 28 42.038 +14 55 24.28 V C57
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)