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
2021-10-01 12:03:58 s 1 +177762.25 7 +161886.94 930.0 C57
2021-10-01 12:13:58 S 06 35 39.050 +14 35 30.88 V C57
2021-10-01 12:13:58 s 1 +177700.50 2 +162626.29 8350.0 C57
2021-10-01 13:03:58 S 06 35 40.872 +14 35 26.99 V C57
2021-10-01 13:03:58 s 1 +177366.81 4 +166299.91 4590.0 C57
2021-10-01 13:13:58 S 06 35 41.198 +14 35 26.99 V C57
2021-10-01 13:13:58 s 1 +177295.15 9 +167030.01 9880.0 C57
2021-10-01 13:23:58 S 06 35 41.570 +14 35 24.50 V C57
2021-10-01 13:23:58 s 1 +177221.88 5 +167758.58 9910.0 C57
2021-10-01 13:33:58 S 06 35 41.942 +14 35 23.96 V C57
2021-10-01 13:33:58 s 1 +177147.00 2 +168485.61 4720.0 C57
2021-10-01 13:43:58 S 06 35 42.276 +14 35 22.52 V C57
2021-10-01 13:43:58 s 1 +177070.51 9 +169211.11 4340.0 C57
2021-10-01 13:53:58 S 06 35 42.662 +14 35 20.58 V C57
2021-10-01 13:53:58 s 1 +176992.44 5 +169935.07 8800.0 C57
2021-10-01 14:03:58 S 06 35 43.027 +14 35 18.02 V C57
2021-10-01 14:03:58 s 1 +176912.78 8 +170657.50 8120.0 C57
2021-10-01 14:13:58 S 06 35 43.471 +14 35 19.18 V C57
2021-10-01 14:13:58 s 1 +176831.55 8 +171378.40 2340.0 C57
2021-10-01 14:23:58 S 06 35 43.740 +14 35 17.09 V C57
2021-10-01 14:23:58 s 1 +176748.76 2 +172097.77 1480.0 C57
2021-10-01 15:33:58 S 06 35 46.236 +14 35 11.90 V C57
2021-10-01 15:33:58 s 1 +176126.08 5 +177090.61 5630.0 C57
2021-10-01 15:43:58 S 06 35 46.685 +14 35 09.17 V C57
2021-10-01 15:43:58 s 1 +176031.07 3 +177797.78 5150.0 C57
2021-10-01 15:53:58 S 06 35 47.011 +14 35 07.69 V C57
2021-10-01 15:53:58 s 1 +175934.57 2 +178503.44 9840.0 C57
2021-10-01 16:03:58 S 06 35 47.441 +14 35 07.76 V C57
2021-10-01 16:03:58 s 1 +175836.58 9 +179207.58 9730.0 C57
2021-10-01 16:13:58 S 06 35 47.755 +14 35 06.72 V C57
2021-10-01 16:13:58 s 1 +175737.13 2 +179910.20 4840.0 C57
2021-10-01 16:23:58 S 06 35 48.156 +14 35 05.32 V C57
2021-10-01 16:23:58 s 1 +175636.20 9 +180611.31 5190.0 C57
2021-10-01 16:33:58 S 06 35 48.502 +14 35 04.45 V C57
2021-10-01 16:33:58 s 1 +175533.82 8 +181310.90 820.0 C57
2021-10-01 16:43:58 S 06 35 48.749 +14 35 00.67 V C57
2021-10-01 16:43:58 s 1 +175429.99 7 +182008.98 1750.0 C57
2021-10-01 16:53:58 S 06 35 49.140 +14 35 00.89 V C57
2021-10-01 16:53:58 s 1 +175324.72 4 +182705.56 8010.0 C57
2021-10-01 17:53:58 S 06 35 51.230 +14 34 50.92 V C57
2021-10-01 17:53:58 s 1 +174663.22 8 +186853.35 8800.0 C57
2021-10-01 18:03:58 S 06 35 51.799 +14 34 51.89 V C57
2021-10-01 18:03:58 s 1 +174548.07 3 +187539.39 3030.0 C57
2021-10-01 18:13:58 S 06 35 52.068 +14 34 51.85 V C57
2021-10-01 18:13:58 s 1 +174431.53 6 +188223.93 2790.0 C57
2021-10-01 18:23:58 S 06 35 52.488 +14 34 51.85 V C57
2021-10-01 18:23:58 s 1 +174313.62 5 +188906.97 8100.0 C57
2021-10-01 18:33:58 S 06 35 52.692 +14 34 48.47 V C57
2021-10-01 18:33:58 s 1 +174194.34 6 +189588.52 8980.0 C57
2021-10-01 18:43:58 S 06 35 53.112 +14 34 49.40 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)