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
2021-09-21 03:53:58 s 1 +71755.254 0 +345993.35 2620.0 C57
2021-09-21 04:03:58 S 06 25 17.628 +15 05 08.92 V C57
2021-09-21 04:03:58 s 1 +71397.851 0 +346226.82 4250.0 C57
2021-09-21 04:13:58 S 06 25 18.106 +15 05 05.82 V C57
2021-09-21 04:13:58 s 1 +71040.214 0 +346459.16 5160.0 C57
2021-09-21 04:23:58 S 06 25 18.665 +15 05 05.75 V C57
2021-09-21 04:23:58 s 1 +70682.343 0 +346690.38 5340.0 C57
2021-09-21 04:33:58 S 06 25 18.895 +15 05 02.33 V C57
2021-09-21 04:33:58 s 1 +70324.240 0 +346920.46 4820.0 C57
2021-09-21 04:43:58 S 06 25 19.298 +15 05 01.03 V C57
2021-09-21 04:43:58 s 1 +69965.907 0 +347149.42 3580.0 C57
2021-09-21 04:53:58 S 06 25 19.946 +15 04 58.76 V C57
2021-09-21 04:53:58 s 1 +69607.345 0 +347377.25 1640.0 C57
2021-09-21 05:03:58 S 06 25 20.297 +15 04 59.09 V C57
2021-09-21 05:03:58 s 1 +69248.555 0 +347603.95 9010.0 C57
2021-09-21 05:13:58 S 06 25 20.758 +15 04 54.12 V C57
2021-09-21 05:13:58 s 1 +68889.540 0 +347829.53 5670.0 C57
2021-09-21 06:03:58 S 06 25 22.966 +15 04 50.23 V C57
2021-09-21 06:03:58 s 1 +67091.118 0 +348940.55 8770.0 C57
2021-09-21 06:13:58 S 06 25 23.369 +15 04 50.20 V C57
2021-09-21 06:13:58 s 1 +66730.775 0 +349159.39 1370.0 C57
2021-09-21 06:23:58 S 06 25 24.014 +15 04 48.32 V C57
2021-09-21 06:23:58 s 1 +66370.216 0 +349377.10 3310.0 C57
2021-09-21 06:33:58 S 06 25 24.314 +15 04 50.30 V C57
2021-09-21 06:33:58 s 1 +66009.442 0 +349593.70 4590.0 C57
2021-09-21 06:43:58 S 06 25 24.785 +15 04 46.34 V C57
2021-09-21 06:43:58 s 1 +65648.454 0 +349809.17 5220.0 C57
2021-09-21 06:53:58 S 06 25 25.212 +15 04 44.76 V C57
2021-09-21 06:53:58 s 1 +65287.254 0 +350023.53 5210.0 C57
2021-09-21 07:03:58 S 06 25 25.764 +15 04 45.30 V C57
2021-09-21 07:03:58 s 1 +64925.844 0 +350236.76 4550.0 C57
2021-09-21 07:13:58 S 06 25 26.208 +15 04 44.69 V C57
2021-09-21 07:13:58 s 1 +64564.224 0 +350448.88 3250.0 C57
2021-09-21 07:23:58 S 06 25 26.698 +15 04 42.20 V C57
2021-09-21 07:23:58 s 1 +64202.396 0 +350659.88 1320.0 C57
2021-09-21 07:33:58 S 06 25 26.995 +15 04 44.15 V C57
2021-09-21 07:33:58 s 1 +63840.362 0 +350869.76 8770.0 C57
2021-09-21 07:43:58 S 06 25 27.391 +15 04 39.90 V C57
2021-09-21 07:43:58 s 1 +63478.122 0 +351078.53 5580.0 C57
2021-09-21 08:13:58 S 06 25 28.855 +15 04 35.72 V C57
2021-09-21 08:13:58 s 1 +62390.185 0 +351698.13 2330.0 C57
2021-09-21 08:33:58 S 06 25 29.710 +15 04 35.33 V C57
2021-09-21 08:33:58 s 1 +61663.892 0 +352105.63 470.0 C57
2021-09-21 08:43:58 S 06 25 30.127 +15 04 32.45 V C57
2021-09-21 08:43:58 s 1 +61300.449 0 +352307.70 3630.0 C57
2021-09-21 08:53:58 S 06 25 30.758 +15 04 29.50 V C57
2021-09-21 08:53:58 s 1 +60936.811 0 +352508.67 6210.0 C57
2021-09-21 09:03:58 S 06 25 31.147 +15 04 30.04 V C57
2021-09-21 09:03:58 s 1 +60572.978 0 +352708.52 8190.0 C57
2021-09-21 09:13:58 S 06 25 31.519 +15 04 29.86 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)