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
2021-09-25 08:53:58 s 1 -143470.47 9 +289478.45 2310.0 C57
2021-09-25 09:03:58 S 06 29 36.638 +14 52 30.40 V C57
2021-09-25 09:03:58 s 1 -143746.33 1 +289050.07 260.0 C57
2021-09-25 09:13:58 S 06 29 37.063 +14 52 29.46 V C57
2021-09-25 09:13:58 s 1 -144021.58 9 +288620.49 6180.0 C57
2021-09-25 09:23:58 S 06 29 37.490 +14 52 27.19 V C57
2021-09-25 09:23:58 s 1 -144296.25 2 +288189.71 60.0 C57
2021-09-25 09:33:58 S 06 29 37.855 +14 52 23.38 V C57
2021-09-25 09:33:58 s 1 -144570.31 7 +287757.72 1880.0 C57
2021-09-25 09:43:58 S 06 29 38.328 +14 52 24.53 V C57
2021-09-25 09:43:58 s 1 -144843.78 0 +287324.52 1640.0 C57
2021-09-25 10:53:58 S 06 29 41.287 +14 52 16.14 V C57
2021-09-25 10:53:58 s 1 -146740.98 9 +284258.30 1570.0 C57
2021-09-25 11:03:58 S 06 29 41.621 +14 52 14.84 V C57
2021-09-25 11:03:58 s 1 -147009.55 4 +283815.42 4550.0 C57
2021-09-25 11:13:58 S 06 29 41.942 +14 52 12.94 V C57
2021-09-25 11:13:58 s 1 -147277.49 6 +283371.33 5390.0 C57
2021-09-25 11:23:58 S 06 29 42.319 +14 52 10.92 V C57
2021-09-25 11:23:58 s 1 -147544.81 1 +282926.02 4080.0 C57
2021-09-25 11:33:58 S 06 29 42.857 +14 52 09.55 V C57
2021-09-25 11:33:58 s 1 -147811.49 6 +282479.49 610.0 C57
2021-09-25 11:43:58 S 06 29 43.111 +14 52 05.77 V C57
2021-09-25 11:43:58 s 1 -148077.55 0 +282031.75 4990.0 C57
2021-09-25 11:53:58 S 06 29 43.577 +14 52 06.71 V C57
2021-09-25 11:53:58 s 1 -148342.96 9 +281582.78 7190.0 C57
2021-09-25 12:03:58 S 06 29 44.014 +14 52 04.15 V C57
2021-09-25 12:03:58 s 1 -148607.75 1 +281132.60 7210.0 C57
2021-09-25 12:13:58 S 06 29 44.335 +14 52 03.36 V C57
2021-09-25 12:13:58 s 1 -148871.89 4 +280681.20 5040.0 C57
2021-09-25 12:23:58 S 06 29 44.818 +14 52 04.80 V C57
2021-09-25 12:23:58 s 1 -149135.39 3 +280228.57 680.0 C57
2021-09-25 13:03:58 S 06 29 46.512 +14 51 58.39 V C57
2021-09-25 13:03:58 s 1 -150182.91 3 +278405.85 1040.0 C57
2021-09-25 13:23:58 S 06 29 47.426 +14 51 54.36 V C57
2021-09-25 13:23:58 s 1 -150702.74 7 +277487.13 7800.0 C57
2021-09-25 13:33:58 S 06 29 47.712 +14 51 51.98 V C57
2021-09-25 13:33:58 s 1 -150961.67 3 +277025.93 7800.0 C57
2021-09-25 13:43:58 S 06 29 48.031 +14 51 52.67 V C57
2021-09-25 13:43:58 s 1 -151219.93 4 +276563.50 5520.0 C57
2021-09-25 13:53:58 S 06 29 48.367 +14 51 50.98 V C57
2021-09-25 13:53:58 s 1 -151477.52 8 +276099.84 960.0 C57
2021-09-25 14:03:58 S 06 29 48.914 +14 51 49.46 V C57
2021-09-25 14:03:58 s 1 -151734.45 1 +275634.95 4110.0 C57
2021-09-25 14:13:58 S 06 29 49.337 +14 51 48.42 V C57
2021-09-25 14:13:58 s 1 -151990.70 2 +275168.83 4960.0 C57
2021-09-25 14:23:58 S 06 29 49.627 +14 51 46.76 V C57
2021-09-25 14:23:58 s 1 -152246.27 7 +274701.47 3500.0 C57
2021-09-25 14:33:58 S 06 29 50.150 +14 51 46.37 V C57
2021-09-25 14:33:58 s 1 -152501.17 4 +274232.88 9720.0 C57
2021-09-25 14:43:58 S 06 29 50.676 +14 51 45.58 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)