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
2021-09-19 22:33:58 s 1 +129456.80 0 +286582.09 2240.0 C57
2021-09-19 22:43:58 S 06 23 57.007 +15 08 22.88 V C57
2021-09-19 22:43:58 s 1 +129168.12 0 +287027.39 2760.0 C57
2021-09-19 22:53:58 S 06 23 57.574 +15 08 23.06 V C57
2021-09-19 22:53:58 s 1 +128878.85 8 +287471.40 1390.0 C57
2021-09-19 23:03:58 S 06 23 57.946 +15 08 19.86 V C57
2021-09-19 23:03:58 s 1 +128589.01 6 +287914.10 8150.0 C57
2021-09-19 23:13:58 S 06 23 58.438 +15 08 21.16 V C57
2021-09-19 23:13:58 s 1 +128298.59 7 +288355.52 3050.0 C57
2021-09-19 23:23:58 S 06 23 58.925 +15 08 19.50 V C57
2021-09-19 23:23:58 s 1 +128007.60 3 +288795.64 6080.0 C57
2021-09-19 23:33:58 S 06 23 59.434 +15 08 19.64 V C57
2021-09-19 23:33:58 s 1 +127716.03 9 +289234.47 7270.0 C57
2021-09-19 23:43:58 S 06 23 59.762 +15 08 16.73 V C57
2021-09-19 23:43:58 s 1 +127423.90 5 +289672.01 6630.0 C57
2021-09-19 23:53:58 S 06 24 00.283 +15 08 15.14 V C57
2021-09-19 23:53:58 s 1 +127131.20 5 +290108.26 4150.0 C57
2021-09-20 00:03:58 S 06 24 00.701 +15 08 14.89 V C57
2021-09-20 00:03:58 s 1 +126837.94 2 +290543.22 9850.0 C57
2021-09-20 00:13:58 S 06 24 01.241 +15 08 12.77 V C57
2021-09-20 00:13:58 s 1 +126544.11 8 +290976.90 3750.0 C57
2021-09-20 00:23:58 S 06 24 01.627 +15 08 14.93 V C57
2021-09-20 00:23:58 s 1 +126249.73 6 +291409.29 5830.0 C57
2021-09-20 00:33:58 S 06 24 02.213 +15 08 12.98 V C57
2021-09-20 00:33:58 s 1 +125954.79 9 +291840.40 6130.0 C57
2021-09-20 01:13:58 S 06 24 03.991 +15 08 10.82 V C57
2021-09-20 01:13:58 s 1 +124769.54 7 +293552.03 9550.0 C57
2021-09-20 01:23:58 S 06 24 04.490 +15 08 09.28 V C57
2021-09-20 01:23:58 s 1 +124471.87 2 +293976.74 1010.0 C57
2021-09-20 01:33:58 S 06 24 05.002 +15 08 08.38 V C57
2021-09-20 01:33:58 s 1 +124173.65 7 +294400.17 720.0 C57
2021-09-20 01:43:58 S 06 24 05.467 +15 08 05.50 V C57
2021-09-20 01:43:58 s 1 +123874.90 5 +294822.33 8700.0 C57
2021-09-20 01:53:58 S 06 24 05.911 +15 08 03.95 V C57
2021-09-20 01:53:58 s 1 +123575.61 8 +295243.22 4960.0 C57
2021-09-20 02:03:58 S 06 24 06.326 +15 08 02.87 V C57
2021-09-20 02:03:58 s 1 +123275.79 9 +295662.83 9510.0 C57
2021-09-20 02:13:58 S 06 24 07.022 +15 08 04.56 V C57
2021-09-20 02:13:58 s 1 +122975.45 0 +296081.17 2340.0 C57
2021-09-20 02:23:58 S 06 24 07.274 +15 08 01.64 V C57
2021-09-20 02:23:58 s 1 +122674.57 5 +296498.24 3480.0 C57
2021-09-20 02:33:58 S 06 24 07.742 +15 07 59.63 V C57
2021-09-20 02:33:58 s 1 +122373.17 5 +296914.05 2920.0 C57
2021-09-20 02:43:58 S 06 24 08.249 +15 07 56.86 V C57
2021-09-20 02:43:58 s 1 +122071.25 3 +297328.58 680.0 C57
2021-09-20 02:53:58 S 06 24 08.599 +15 07 55.67 V C57
2021-09-20 02:53:58 s 1 +121768.81 1 +297741.85 6770.0 C57
2021-09-20 03:33:58 S 06 24 10.392 +15 07 53.18 V C57
2021-09-20 03:33:58 s 1 +120553.89 9 +299382.28 4540.0 C57
2021-09-20 03:43:58 S 06 24 10.925 +15 07 50.66 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)