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
2021-09-23 04:33:58 s 1 -37436.652 0 +367976.67 8860.0 C57
2021-09-23 04:43:58 S 06 27 25.579 +14 59 09.85 V C57
2021-09-23 04:43:58 s 1 -37811.022 0 +367896.27 5340.0 C57
2021-09-23 04:53:58 S 06 27 25.992 +14 59 11.29 V C57
2021-09-23 04:53:58 s 1 -38185.288 0 +367814.82 1400.0 C57
2021-09-23 05:03:58 S 06 27 26.606 +14 59 07.91 V C57
2021-09-23 05:03:58 s 1 -38559.448 0 +367732.30 7040.0 C57
2021-09-23 06:13:58 S 06 27 29.419 +14 59 00.38 V C57
2021-09-23 06:13:58 s 1 -41175.542 0 +367125.16 4600.0 C57
2021-09-23 06:23:58 S 06 27 29.928 +14 58 58.48 V C57
2021-09-23 06:23:58 s 1 -41548.823 0 +367034.21 6790.0 C57
2021-09-23 06:33:58 S 06 27 30.439 +14 59 00.46 V C57
2021-09-23 06:33:58 s 1 -41921.990 0 +366942.19 8520.0 C57
2021-09-23 06:43:58 S 06 27 30.715 +14 58 58.44 V C57
2021-09-23 06:43:58 s 1 -42295.040 0 +366849.12 9800.0 C57
2021-09-23 06:53:58 S 06 27 31.272 +14 58 56.93 V C57
2021-09-23 06:53:58 s 1 -42667.973 0 +366754.99 630.0 C57
2021-09-23 07:03:58 S 06 27 31.584 +14 58 55.49 V C57
2021-09-23 07:03:58 s 1 -43040.788 0 +366659.81 990.0 C57
2021-09-23 07:13:58 S 06 27 32.090 +14 58 53.40 V C57
2021-09-23 07:13:58 s 1 -43413.483 0 +366563.57 890.0 C57
2021-09-23 07:23:58 S 06 27 32.578 +14 58 51.49 V C57
2021-09-23 07:23:58 s 1 -43786.058 0 +366466.27 320.0 C57
2021-09-23 07:33:58 S 06 27 32.772 +14 58 51.20 V C57
2021-09-23 07:33:58 s 1 -44158.511 0 +366367.92 9280.0 C57
2021-09-23 08:03:58 S 06 27 34.073 +14 58 47.14 V C57
2021-09-23 08:03:58 s 1 -45275.130 0 +366066.51 3290.0 C57
2021-09-23 08:13:58 S 06 27 34.577 +14 58 44.76 V C57
2021-09-23 08:13:58 s 1 -45647.086 0 +365963.93 330.0 C57
2021-09-23 08:23:58 S 06 27 34.997 +14 58 41.88 V C57
2021-09-23 08:23:58 s 1 -46018.915 0 +365860.29 6870.0 C57
2021-09-23 08:33:58 S 06 27 35.465 +14 58 46.24 V C57
2021-09-23 08:33:58 s 1 -46390.615 0 +365755.59 2930.0 C57
2021-09-23 08:43:58 S 06 27 35.818 +14 58 40.76 V C57
2021-09-23 08:43:58 s 1 -46762.185 0 +365649.84 8480.0 C57
2021-09-23 08:53:58 S 06 27 36.324 +14 58 40.37 V C57
2021-09-23 08:53:58 s 1 -47133.625 0 +365543.02 3530.0 C57
2021-09-23 09:03:58 S 06 27 36.725 +14 58 38.42 V C57
2021-09-23 09:03:58 s 1 -47504.933 0 +365435.15 8080.0 C57
2021-09-23 09:13:58 S 06 27 37.171 +14 58 36.37 V C57
2021-09-23 09:13:58 s 1 -47876.109 0 +365326.22 2120.0 C57
2021-09-23 09:23:58 S 06 27 37.529 +14 58 38.82 V C57
2021-09-23 09:23:58 s 1 -48247.150 0 +365216.23 5640.0 C57
2021-09-23 09:33:58 S 06 27 38.107 +14 58 35.11 V C57
2021-09-23 09:33:58 s 1 -48618.057 0 +365105.18 8650.0 C57
2021-09-23 09:43:58 S 06 27 38.455 +14 58 36.01 V C57
2021-09-23 09:43:58 s 1 -48988.827 0 +364993.08 1130.0 C57
2021-09-23 09:53:58 S 06 27 39.019 +14 58 32.30 V C57
2021-09-23 09:53:58 s 1 -49359.459 0 +364879.91 3100.0 C57
2021-09-23 10:03:58 S 06 27 39.290 +14 58 31.33 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)