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
2021-10-08 13:23:57 s 1 -137407.53 6 +283405.87 5960.0 C57
2021-10-08 13:33:57 S 06 40 48.962 +14 14 01.82 V C57
2021-10-08 13:33:57 s 1 -137674.38 8 +282954.62 4830.0 C57
2021-10-08 13:43:57 S 06 40 49.277 +14 13 59.84 V C57
2021-10-08 13:43:57 s 1 -137940.61 0 +282502.09 1510.0 C57
2021-10-08 14:03:57 S 06 40 49.778 +14 13 58.22 V C57
2021-10-08 14:03:57 s 1 -138471.19 2 +281593.26 8430.0 C57
2021-10-08 14:13:57 S 06 40 49.987 +14 13 58.51 V C57
2021-10-08 14:13:57 s 1 -138735.53 8 +281136.94 8630.0 C57
2021-10-08 15:33:57 S 06 40 51.890 +14 13 45.73 V C57
2021-10-08 15:33:57 s 1 -140827.37 4 +277440.82 820.0 C57
2021-10-08 15:43:57 S 06 40 52.327 +14 13 43.75 V C57
2021-10-08 15:43:57 s 1 -141085.93 8 +276973.07 1010.0 C57
2021-10-08 15:53:57 S 06 40 52.646 +14 13 43.46 V C57
2021-10-08 15:53:57 s 1 -141343.84 4 +276504.05 8930.0 C57
2021-10-08 16:03:57 S 06 40 52.774 +14 13 39.83 V C57
2021-10-08 16:03:57 s 1 -141601.10 1 +276033.78 4600.0 C57
2021-10-08 16:23:57 S 06 40 53.359 +14 13 39.29 V C57
2021-10-08 16:23:57 s 1 -142113.60 4 +275089.34 8980.0 C57
2021-10-13 03:43:57 S 06 43 46.747 +14 00 57.35 V C57
2021-10-13 03:43:57 s 1 +146471.23 5 +15261.443 5570.0 C57
2021-10-13 03:53:57 S 06 43 47.088 +14 00 56.34 V C57
2021-10-13 03:53:57 s 1 +146947.23 3 +16247.975 7450.0 C57
2021-10-13 04:03:57 S 06 43 47.280 +14 00 55.84 V C57
2021-10-13 04:03:57 s 1 +147417.67 2 +17233.890 490.0 C57
2021-10-13 04:13:57 S 06 43 47.549 +14 00 54.65 V C57
2021-10-13 04:13:57 s 1 +147882.60 0 +18219.160 4880.0 C57
2021-10-13 04:23:57 S 06 43 47.722 +14 00 54.68 V C57
2021-10-13 04:23:57 s 1 +148342.06 0 +19203.754 740.0 C57
2021-10-13 04:43:57 S 06 43 48.341 +14 00 54.22 V C57
2021-10-13 04:43:57 s 1 +149244.76 0 +21170.806 7560.0 C57
2021-10-13 05:43:57 S 06 43 49.949 +14 00 50.18 V C57
2021-10-13 05:43:57 s 1 +151826.25 3 +27052.962 9440.0 C57
2021-10-13 05:53:57 S 06 43 50.083 +14 00 46.87 V C57
2021-10-13 05:53:57 s 1 +152238.49 0 +28030.290 5460.0 C57
2021-10-13 06:03:57 S 06 43 50.225 +14 00 46.58 V C57
2021-10-13 06:03:57 s 1 +152645.69 1 +29006.690 4450.0 C57
2021-10-13 06:13:57 S 06 43 50.602 +14 00 45.29 V C57
2021-10-13 06:13:57 s 1 +153047.89 9 +29982.140 6540.0 C57
2021-10-13 06:23:57 S 06 43 50.880 +14 00 44.93 V C57
2021-10-13 06:23:57 s 1 +153445.15 5 +30956.620 1880.0 C57
2021-10-13 06:33:57 S 06 43 51.178 +14 00 45.25 V C57
2021-10-13 06:33:57 s 1 +153837.49 8 +31930.107 600.0 C57
2021-10-13 06:43:57 S 06 43 51.430 +14 00 43.24 V C57
2021-10-13 06:43:57 s 1 +154224.96 8 +32902.582 2840.0 C57
2021-10-13 06:53:57 S 06 43 51.636 +14 00 43.34 V C57
2021-10-13 06:53:57 s 1 +154607.60 5 +33874.026 8730.0 C57
2021-10-13 08:13:57 S 06 43 53.484 +14 00 32.58 V C57
2021-10-13 08:13:57 s 1 +157499.34 0 +41606.224 3190.0 C57
2021-10-13 08:33:57 S 06 43 54.077 +14 00 29.02 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)