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
2021-11-24 02:03:55 s 1 +120307.22 9 +322974.61 8060.0 C57
2021-11-24 02:13:55 S 06 35 27.103 +12 50 48.62 V C57
2021-11-24 02:13:55 s 1 +120017.20 0 +323324.04 3980.0 C57
2021-11-24 02:23:55 S 06 35 26.561 +12 50 49.74 V C57
2021-11-24 02:23:55 s 1 +119726.75 7 +323672.36 8490.0 C57
2021-11-24 02:33:55 S 06 35 26.201 +12 50 48.59 V C57
2021-11-24 02:33:55 s 1 +119435.90 1 +324019.57 1590.0 C57
2021-11-24 02:43:55 S 06 35 25.798 +12 50 48.84 V C57
2021-11-24 02:43:55 s 1 +119144.63 3 +324365.66 3300.0 C57
2021-11-24 02:53:55 S 06 35 25.380 +12 50 48.62 V C57
2021-11-24 02:53:55 s 1 +118852.95 6 +324710.65 3620.0 C57
2021-11-24 03:03:55 S 06 35 24.926 +12 50 48.70 V C57
2021-11-24 03:03:55 s 1 +118560.87 0 +325054.52 2560.0 C57
2021-11-24 03:13:55 S 06 35 24.566 +12 50 47.76 V C57
2021-11-24 03:13:55 s 1 +118268.37 9 +325397.29 120.0 C57
2021-11-24 03:23:55 S 06 35 24.146 +12 50 48.70 V C57
2021-11-24 03:23:55 s 1 +117975.48 3 +325738.95 6310.0 C57
2021-11-24 03:33:55 S 06 35 23.638 +12 50 48.30 V C57
2021-11-24 03:33:55 s 1 +117682.18 5 +326079.50 1130.0 C57
2021-11-24 03:43:55 S 06 35 23.273 +12 50 48.44 V C57
2021-11-24 03:43:55 s 1 +117388.48 5 +326418.94 4600.0 C57
2021-11-24 03:53:55 S 06 35 22.937 +12 50 49.06 V C57
2021-11-24 03:53:55 s 1 +117094.38 7 +326757.28 6710.0 C57
2021-11-24 04:03:55 S 06 35 22.375 +12 50 48.91 V C57
2021-11-24 04:03:55 s 1 +116799.89 1 +327094.52 7480.0 C57
2021-11-24 04:13:55 S 06 35 22.058 +12 50 48.77 V C57
2021-11-24 04:13:55 s 1 +116504.99 9 +327430.64 6910.0 C57
2021-11-24 04:23:55 S 06 35 21.641 +12 50 49.16 V C57
2021-11-24 04:23:55 s 1 +116209.71 3 +327765.67 5010.0 C57
2021-11-24 04:33:55 S 06 35 21.142 +12 50 48.88 V C57
2021-11-24 04:33:55 s 1 +115914.03 5 +328099.59 1780.0 C57
2021-11-24 04:43:55 S 06 35 20.724 +12 50 48.44 V C57
2021-11-24 04:43:55 s 1 +115617.96 5 +328432.42 7230.0 C57
2021-11-24 04:53:55 S 06 35 20.357 +12 50 48.44 V C57
2021-11-24 04:53:55 s 1 +115321.50 7 +328764.14 1370.0 C57
2021-11-24 05:03:55 S 06 35 19.961 +12 50 49.16 V C57
2021-11-24 05:03:55 s 1 +115024.66 2 +329094.76 4200.0 C57
2021-11-24 05:13:55 S 06 35 19.495 +12 50 49.02 V C57
2021-11-24 05:13:55 s 1 +114727.43 0 +329424.28 5720.0 C57
2021-11-24 05:23:55 S 06 35 19.166 +12 50 48.95 V C57
2021-11-24 05:23:55 s 1 +114429.81 5 +329752.70 5960.0 C57
2021-11-24 05:33:55 S 06 35 18.643 +12 50 49.31 V C57
2021-11-24 05:33:55 s 1 +114131.81 7 +330080.02 4900.0 C57
2021-11-24 05:43:55 S 06 35 18.218 +12 50 49.52 V C57
2021-11-24 05:43:55 s 1 +113833.43 9 +330406.25 2560.0 C57
2021-11-24 05:53:55 S 06 35 17.844 +12 50 48.95 V C57
2021-11-24 05:53:55 s 1 +113534.68 1 +330731.38 8940.0 C57
2021-11-24 06:03:55 S 06 35 17.489 +12 50 49.67 V C57
2021-11-24 06:03:55 s 1 +113235.54 6 +331055.41 4050.0 C57
2021-11-24 06:13:55 S 06 35 17.035 +12 50 51.54 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)