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
2021-11-14 16:53:55 S 06 42 46.346 +12 53 30.95 V C57
2021-11-14 16:53:55 s 1 -64393.908 0 +359687.18 8430.0 C57
2021-11-14 17:03:55 S 06 42 45.994 +12 53 30.08 V C57
2021-11-14 17:03:55 s 1 -64732.942 0 +359485.46 3450.0 C57
2021-11-14 17:23:55 S 06 42 45.389 +12 53 28.79 V C57
2021-11-14 17:23:55 s 1 -65410.442 0 +359078.87 910.0 C57
2021-11-14 17:33:55 S 06 42 45.139 +12 53 28.64 V C57
2021-11-14 17:33:55 s 1 -65748.906 0 +358873.99 3340.0 C57
2021-11-14 17:43:55 S 06 42 44.868 +12 53 28.28 V C57
2021-11-14 17:43:55 s 1 -66087.178 0 +358668.07 4910.0 C57
2021-11-14 17:53:55 S 06 42 44.626 +12 53 27.46 V C57
2021-11-14 17:53:55 s 1 -66425.256 0 +358461.10 5600.0 C57
2021-11-14 18:03:55 S 06 42 44.304 +12 53 27.10 V C57
2021-11-14 18:03:55 s 1 -66763.139 0 +358253.07 5410.0 C57
2021-11-14 19:23:55 S 06 42 41.998 +12 53 22.06 V C57
2021-11-14 19:23:55 s 1 -69459.051 0 +356550.94 1680.0 C57
2021-11-14 19:33:55 S 06 42 41.803 +12 53 22.99 V C57
2021-11-14 19:33:55 s 1 -69795.128 0 +356333.43 3360.0 C57
2021-11-14 19:43:55 S 06 42 41.470 +12 53 22.52 V C57
2021-11-14 19:43:55 s 1 -70130.997 0 +356114.86 4120.0 C57
2021-11-14 19:53:55 S 06 42 41.124 +12 53 21.37 V C57
2021-11-14 19:53:55 s 1 -70466.658 0 +355895.23 3950.0 C57
2021-11-14 20:03:55 S 06 42 40.848 +12 53 20.90 V C57
2021-11-14 20:03:55 s 1 -70802.110 0 +355674.54 2840.0 C57
2021-11-14 20:13:55 S 06 42 40.562 +12 53 21.16 V C57
2021-11-14 20:13:55 s 1 -71137.351 0 +355452.79 790.0 C57
2021-11-14 20:23:55 S 06 42 40.272 +12 53 20.36 V C57
2021-11-14 20:23:55 s 1 -71472.380 0 +355229.98 7790.0 C57
2021-11-14 20:33:55 S 06 42 39.919 +12 53 19.21 V C57
2021-11-14 20:33:55 s 1 -71807.196 0 +355006.11 3850.0 C57
2021-11-14 21:53:55 S 06 42 37.699 +12 53 15.07 V C57
2021-11-14 21:53:55 s 1 -74477.901 0 +353176.93 7450.0 C57
2021-11-14 22:03:55 S 06 42 37.392 +12 53 14.82 V C57
2021-11-14 22:03:55 s 1 -74810.742 0 +352943.49 4730.0 C57
2021-11-14 22:13:55 S 06 42 37.037 +12 53 14.82 V C57
2021-11-14 22:13:55 s 1 -75143.357 0 +352708.99 1010.0 C57
2021-11-14 22:23:55 S 06 42 36.775 +12 53 14.14 V C57
2021-11-14 22:23:55 s 1 -75475.745 0 +352473.42 6280.0 C57
2021-11-14 22:33:55 S 06 42 36.542 +12 53 14.35 V C57
2021-11-14 22:33:55 s 1 -75807.905 0 +352236.79 540.0 C57
2021-11-14 22:43:55 S 06 42 36.197 +12 53 11.83 V C57
2021-11-14 22:43:55 s 1 -76139.835 0 +351999.08 3780.0 C57
2021-11-14 22:53:55 S 06 42 36.031 +12 53 12.12 V C57
2021-11-14 22:53:55 s 1 -76471.534 0 +351760.31 6010.0 C57
2021-11-14 23:03:55 S 06 42 35.616 +12 53 11.83 V C57
2021-11-14 23:03:55 s 1 -76803.001 0 +351520.46 7210.0 C57
2021-11-15 00:23:55 S 06 42 33.389 +12 53 08.59 V C57
2021-11-15 00:23:55 s 1 -79446.215 0 +349563.15 9290.0 C57
2021-11-15 00:33:55 S 06 42 33.060 +12 53 07.66 V C57
2021-11-15 00:33:55 s 1 -79775.532 0 +349313.66 1030.0 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)