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
2021-10-07 21:23:57 s 1 -109278.29 8 +321032.15 9850.0 C57
2021-10-07 22:43:57 S 06 40 25.505 +14 16 04.12 V C57
2021-10-07 22:43:57 s 1 -111788.98 7 +318316.54 4660.0 C57
2021-10-07 22:53:57 S 06 40 25.793 +14 16 02.42 V C57
2021-10-07 22:53:57 s 1 -112100.95 6 +317971.83 10.0 C57
2021-10-07 23:03:57 S 06 40 26.030 +14 16 00.48 V C57
2021-10-07 23:03:57 s 1 -112412.51 3 +317625.97 3930.0 C57
2021-10-07 23:13:57 S 06 40 26.405 +14 15 58.93 V C57
2021-10-07 23:13:57 s 1 -112723.64 0 +317278.93 6360.0 C57
2021-10-07 23:23:57 S 06 40 26.503 +14 15 57.82 V C57
2021-10-07 23:23:57 s 1 -113034.34 3 +316930.72 7300.0 C57
2021-10-07 23:33:57 S 06 40 26.902 +14 15 55.55 V C57
2021-10-07 23:33:57 s 1 -113344.62 7 +316581.35 6790.0 C57
2021-10-07 23:43:57 S 06 40 27.060 +14 15 54.54 V C57
2021-10-07 23:43:57 s 1 -113654.47 6 +316230.80 4770.0 C57
2021-10-07 23:53:57 S 06 40 27.434 +14 15 53.03 V C57
2021-10-07 23:53:57 s 1 -113963.89 5 +315879.07 1250.0 C57
2021-10-08 01:13:57 S 06 40 29.503 +14 15 42.62 V C57
2021-10-08 01:13:57 s 1 -116423.56 1 +313022.95 8580.0 C57
2021-10-08 01:23:57 S 06 40 29.858 +14 15 41.62 V C57
2021-10-08 01:23:57 s 1 -116729.02 3 +312660.63 1310.0 C57
2021-10-08 01:33:57 S 06 40 30.108 +14 15 40.14 V C57
2021-10-08 01:33:57 s 1 -117034.04 3 +312297.14 2500.0 C57
2021-10-08 01:43:57 S 06 40 30.365 +14 15 39.82 V C57
2021-10-08 01:43:57 s 1 -117338.60 6 +311932.45 2100.0 C57
2021-10-08 01:53:57 S 06 40 30.593 +14 15 36.58 V C57
2021-10-08 01:53:57 s 1 -117642.71 3 +311566.57 120.0 C57
2021-10-08 02:03:57 S 06 40 30.833 +14 15 35.86 V C57
2021-10-08 02:03:57 s 1 -117946.37 3 +311199.53 6590.0 C57
2021-10-08 02:13:57 S 06 40 31.109 +14 15 36.58 V C57
2021-10-08 02:13:57 s 1 -118249.56 9 +310831.29 1440.0 C57
2021-10-08 03:33:57 S 06 40 33.108 +14 15 24.34 V C57
2021-10-08 03:33:57 s 1 -120658.43 7 +307842.58 2260.0 C57
2021-10-08 03:43:57 S 06 40 33.490 +14 15 21.53 V C57
2021-10-08 03:43:57 s 1 -120957.42 3 +307463.62 2490.0 C57
2021-10-08 03:53:57 S 06 40 33.773 +14 15 22.32 V C57
2021-10-08 03:53:57 s 1 -121255.93 0 +307083.47 1060.0 C57
2021-10-08 04:03:57 S 06 40 34.068 +14 15 19.55 V C57
2021-10-08 04:03:57 s 1 -121553.96 4 +306702.13 7990.0 C57
2021-10-08 04:13:57 S 06 40 34.236 +14 15 19.37 V C57
2021-10-08 04:13:57 s 1 -121851.50 9 +306319.59 3220.0 C57
2021-10-08 04:23:57 S 06 40 34.608 +14 15 19.37 V C57
2021-10-08 04:23:57 s 1 -122148.56 8 +305935.84 6760.0 C57
2021-10-08 04:33:57 S 06 40 34.858 +14 15 17.14 V C57
2021-10-08 04:33:57 s 1 -122445.14 9 +305550.92 8640.0 C57
2021-10-08 04:43:57 S 06 40 35.225 +14 15 17.50 V C57
2021-10-08 04:43:57 s 1 -122741.23 4 +305164.77 8810.0 C57
2021-10-08 05:43:57 S 06 40 36.530 +14 15 03.28 V C57
2021-10-08 05:43:57 s 1 -124507.36 9 +302822.68 3770.0 C57
2021-10-08 05:53:57 S 06 40 36.970 +14 15 04.79 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)