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
2021-09-21 21:43:58 S 06 26 05.016 +15 02 57.98 V C57
2021-09-21 21:43:58 s 1 +32450.633 0 +364681.11 7170.0 C57
2021-09-21 21:53:58 S 06 26 05.342 +15 02 57.59 V C57
2021-09-21 21:53:58 s 1 +32075.642 0 +364796.77 6680.0 C57
2021-09-21 22:33:58 S 06 26 06.955 +15 02 57.16 V C57
2021-09-21 22:33:58 s 1 +30574.713 0 +365248.63 2130.0 C57
2021-09-21 22:43:58 S 06 26 07.450 +15 02 56.58 V C57
2021-09-21 22:43:58 s 1 +30199.245 0 +365358.91 360.0 C57
2021-09-21 22:53:58 S 06 26 08.018 +15 02 52.33 V C57
2021-09-21 22:53:58 s 1 +29823.685 0 +365468.10 8350.0 C57
2021-09-21 23:03:58 S 06 26 08.285 +15 02 51.43 V C57
2021-09-21 23:03:58 s 1 +29448.035 0 +365576.23 6100.0 C57
2021-09-21 23:13:58 S 06 26 08.777 +15 02 49.20 V C57
2021-09-21 23:13:58 s 1 +29072.294 0 +365683.28 3610.0 C57
2021-09-21 23:23:58 S 06 26 09.350 +15 02 49.99 V C57
2021-09-21 23:23:58 s 1 +28696.465 0 +365789.25 880.0 C57
2021-09-21 23:33:58 S 06 26 09.758 +15 02 47.33 V C57
2021-09-21 23:33:58 s 1 +28320.548 0 +365894.15 7930.0 C57
2021-09-21 23:43:58 S 06 26 10.183 +15 02 46.93 V C57
2021-09-21 23:43:58 s 1 +27944.545 0 +365997.97 4760.0 C57
2021-09-21 23:53:58 S 06 26 10.668 +15 02 42.90 V C57
2021-09-21 23:53:58 s 1 +27568.457 0 +366100.73 1360.0 C57
2021-09-22 00:03:58 S 06 26 11.040 +15 02 44.84 V C57
2021-09-22 00:03:58 s 1 +27192.285 0 +366202.40 7750.0 C57
2021-09-22 00:13:58 S 06 26 11.441 +15 02 40.70 V C57
2021-09-22 00:13:58 s 1 +26816.031 0 +366303.01 3920.0 C57
2021-09-22 00:23:58 S 06 26 11.947 +15 02 38.15 V C57
2021-09-22 00:23:58 s 1 +26439.694 0 +366402.54 9880.0 C57
2021-09-22 00:33:58 S 06 26 12.266 +15 02 38.62 V C57
2021-09-22 00:33:58 s 1 +26063.277 0 +366501.00 5640.0 C57
2021-09-22 01:13:58 S 06 26 14.122 +15 02 34.62 V C57
2021-09-22 01:13:58 s 1 +24556.824 0 +366884.11 6680.0 C57
2021-09-22 01:23:58 S 06 26 14.700 +15 02 34.84 V C57
2021-09-22 01:23:58 s 1 +24180.021 0 +366977.21 1470.0 C57
2021-09-22 01:33:58 S 06 26 15.026 +15 02 32.39 V C57
2021-09-22 01:33:58 s 1 +23803.144 0 +367069.24 6070.0 C57
2021-09-22 01:43:58 S 06 26 15.331 +15 02 31.38 V C57
2021-09-22 01:43:58 s 1 +23426.195 0 +367160.19 490.0 C57
2021-09-22 01:53:58 S 06 26 16.010 +15 02 29.58 V C57
2021-09-22 01:53:58 s 1 +23049.173 0 +367250.08 4740.0 C57
2021-09-22 02:03:58 S 06 26 16.322 +15 02 29.33 V C57
2021-09-22 02:03:58 s 1 +22672.082 0 +367338.90 8810.0 C57
2021-09-22 02:13:58 S 06 26 16.745 +15 02 30.01 V C57
2021-09-22 02:13:58 s 1 +22294.920 0 +367426.65 2720.0 C57
2021-09-22 02:23:58 S 06 26 17.213 +15 02 25.62 V C57
2021-09-22 02:23:58 s 1 +21917.691 0 +367513.33 6460.0 C57
2021-09-22 02:33:58 S 06 26 17.702 +15 02 27.31 V C57
2021-09-22 02:33:58 s 1 +21540.395 0 +367598.94 40.0 C57
2021-09-22 02:43:58 S 06 26 18.233 +15 02 24.18 V C57
2021-09-22 02:43:58 s 1 +21163.033 0 +367683.48 3470.0 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)