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
2021-11-07 20:03:55 S 06 46 21.134 +13 01 42.56 V C57
2021-11-07 20:03:55 s 1 +151152.72 4 +30177.795 5210.0 C57
2021-11-07 22:03:55 S 06 46 19.589 +13 01 34.43 V C57
2021-11-07 22:03:55 s 1 +155852.44 3 +41755.275 3570.0 C57
2021-11-07 22:13:55 S 06 46 19.481 +13 01 33.17 V C57
2021-11-07 22:13:55 s 1 +156213.85 6 +42712.641 6580.0 C57
2021-11-07 22:23:55 S 06 46 19.402 +13 01 32.92 V C57
2021-11-07 22:23:55 s 1 +156570.79 8 +43668.792 3670.0 C57
2021-11-07 22:33:55 S 06 46 19.327 +13 01 34.03 V C57
2021-11-07 22:33:55 s 1 +156923.30 4 +44623.712 4990.0 C57
2021-11-07 22:43:55 S 06 46 19.212 +13 01 32.05 V C57
2021-11-07 22:43:55 s 1 +157271.41 2 +45577.389 640.0 C57
2021-11-07 22:53:55 S 06 46 19.054 +13 01 31.08 V C57
2021-11-07 22:53:55 s 1 +157615.15 9 +46529.808 780.0 C57
2021-11-08 00:33:55 S 06 46 17.760 +13 01 27.66 V C57
2021-11-08 00:33:55 s 1 +160820.38 1 +55982.162 6330.0 C57
2021-11-08 01:13:55 S 06 46 17.206 +13 01 26.98 V C57
2021-11-08 01:13:55 s 1 +161988.92 7 +59725.011 3060.0 C57
2021-11-08 02:43:55 S 06 46 16.061 +13 01 23.52 V C57
2021-11-08 02:43:55 s 1 +164395.02 9 +68062.766 1110.0 C57
2021-11-08 03:03:55 S 06 46 15.850 +13 01 22.98 V C57
2021-11-08 03:03:55 s 1 +164889.38 2 +69899.462 5360.0 C57
2021-11-08 03:13:55 S 06 46 15.725 +13 01 23.02 V C57
2021-11-08 03:13:55 s 1 +165131.22 7 +70815.571 3580.0 C57
2021-11-08 03:23:55 S 06 46 15.554 +13 01 21.72 V C57
2021-11-08 03:23:55 s 1 +165369.55 5 +71730.178 9330.0 C57
2021-11-08 03:33:55 S 06 46 15.384 +13 01 20.57 V C57
2021-11-08 03:33:55 s 1 +165604.39 2 +72643.279 2700.0 C57
2021-11-08 05:53:55 S 06 46 13.534 +13 01 15.06 V C57
2021-11-08 05:53:55 s 1 +168540.03 0 +85265.814 2590.0 C57
2021-11-08 07:33:55 S 06 46 12.142 +13 01 13.01 V C57
2021-11-08 07:33:55 s 1 +170258.68 2 +94094.262 6630.0 C57
2021-11-08 10:22:18 C 06 45 58.02 +12 59 55.4 V G96
2021-11-08 10:23:55 S 06 46 09.744 +13 01 05.38 V C57
2021-11-08 10:23:55 s 1 +172525.24 9 +108736.10 8060.0 C57
2021-11-08 10:29:52 C 06 45 57.89 +12 59 54.9 V G96
2021-11-08 10:37:27 C 06 45 57.75 +12 59 54.4 V G96
2021-11-08 10:45:02 C 06 45 57.63 +12 59 54.1 V G96
2021-11-08 12:43:55 S 06 46 07.673 +13 01 00.12 V C57
2021-11-08 12:43:55 s 1 +173828.74 4 +120444.31 9490.0 C57
2021-11-08 12:53:55 S 06 46 07.447 +13 00 58.68 V C57
2021-11-08 12:53:55 s 1 +173903.75 0 +121268.51 7840.0 C57
2021-11-08 13:03:55 S 06 46 07.310 +13 01 00.16 V C57
2021-11-08 13:03:55 s 1 +173975.78 6 +122091.90 2260.0 C57
2021-11-08 13:13:55 S 06 46 07.207 +13 00 58.36 V C57
2021-11-08 13:13:55 s 1 +174046.20 3 +122912.81 4740.0 C57
2021-11-08 15:03:55 S 06 46 05.585 +13 00 54.04 V C57
2021-11-08 15:03:55 s 1 +174671.98 9 +131837.01 5340.0 C57
2021-11-08 15:13:55 S 06 46 05.388 +13 00 53.28 V C57
2021-11-08 15:13:55 s 1 +174715.76 5 +132638.65 3760.0 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)