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
2021-09-27 06:23:58 s 1 -184615.87 1 +124324.74 1680.0 C57
2021-09-27 06:33:58 S 06 31 26.808 +14 46 26.44 V C57
2021-09-27 06:33:58 s 1 -184573.18 3 +123528.91 6320.0 C57
2021-09-27 06:43:58 S 06 31 27.257 +14 46 24.20 V C57
2021-09-27 06:43:58 s 1 -184528.32 9 +122731.62 3720.0 C57
2021-09-27 06:53:58 S 06 31 27.677 +14 46 26.11 V C57
2021-09-27 06:53:58 s 1 -184481.29 7 +121932.89 3850.0 C57
2021-09-27 07:03:58 S 06 31 27.962 +14 46 23.99 V C57
2021-09-27 07:03:58 s 1 -184432.07 4 +121132.70 6670.0 C57
2021-09-27 07:13:58 S 06 31 28.325 +14 46 22.12 V C57
2021-09-27 07:13:58 s 1 -184380.64 6 +120331.06 2130.0 C57
2021-09-27 11:13:58 S 06 31 38.081 +14 45 50.65 V C57
2021-09-27 11:13:58 s 1 -182449.77 5 +100658.92 9910.0 C57
2021-09-27 11:43:58 S 06 31 39.533 +14 45 48.35 V C57
2021-09-27 11:43:58 s 1 -182108.91 2 +98142.016 4250.0 C57
2021-09-27 16:33:58 S 06 31 50.918 +14 45 07.27 V C57
2021-09-27 16:33:58 s 1 -177529.76 8 +73166.465 6590.0 C57
2021-09-27 16:43:58 S 06 31 51.511 +14 45 04.61 V C57
2021-09-27 16:43:58 s 1 -177327.52 1 +72285.207 9920.0 C57
2021-09-27 18:13:58 S 06 31 54.991 +14 44 51.94 V C57
2021-09-27 18:13:58 s 1 -175362.24 6 +64296.394 8160.0 C57
2021-09-27 18:23:58 S 06 31 55.418 +14 44 52.48 V C57
2021-09-27 18:23:58 s 1 -175127.36 5 +63402.479 3120.0 C57
2021-09-27 18:33:58 S 06 31 55.980 +14 44 51.58 V C57
2021-09-27 18:33:58 s 1 -174889.09 9 +62507.335 6850.0 C57
2021-09-27 18:43:58 S 06 31 56.369 +14 44 49.42 V C57
2021-09-27 18:43:58 s 1 -174647.42 3 +61610.971 9260.0 C57
2021-09-27 18:53:58 S 06 31 56.556 +14 44 48.88 V C57
2021-09-27 18:53:58 s 1 -174402.31 6 +60713.393 290.0 C57
2021-09-27 19:03:58 S 06 31 57.055 +14 44 48.59 V C57
2021-09-27 19:03:58 s 1 -174153.75 4 +59814.609 9850.0 C57
2021-09-27 19:13:58 S 06 31 57.341 +14 44 46.39 V C57
2021-09-27 19:13:58 s 1 -173901.71 3 +58914.628 7860.0 C57
2021-09-27 20:33:58 S 06 32 00.893 +14 44 37.68 V C57
2021-09-27 20:33:58 s 1 -171757.25 0 +51672.699 6990.0 C57
2021-09-29 23:33:58 S 06 34 13.627 +14 39 12.96 V C57
2021-09-29 23:33:58 s 1 +122966.47 8 -33155.186 6640.0 C57
2021-09-29 23:43:58 S 06 34 14.117 +14 39 11.88 V C57
2021-09-29 23:43:58 s 1 +123726.57 9 -32207.857 10.0 C57
2021-09-29 23:53:58 S 06 34 14.546 +14 39 11.81 V C57
2021-09-29 23:53:58 s 1 +124479.34 4 -31258.619 9110.0 C57
2021-09-30 00:03:58 S 06 34 14.815 +14 39 09.11 V C57
2021-09-30 00:03:58 s 1 +125224.81 9 -30307.553 4080.0 C57
2021-09-30 01:13:58 S 06 34 17.647 +14 39 01.44 V C57
2021-09-30 01:13:58 s 1 +130242.77 3 -23605.173 6260.0 C57
2021-09-30 01:23:58 S 06 34 18.322 +14 39 00.79 V C57
2021-09-30 01:23:58 s 1 +130931.54 5 -22642.128 3750.0 C57
2021-09-30 01:33:58 S 06 34 18.799 +14 39 02.81 V C57
2021-09-30 01:33:58 s 1 +131613.43 4 -21677.895 8500.0 C57
2021-09-30 01:43:58 S 06 34 19.198 +14 38 58.85 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)