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 14:43:58 S 06 25 46.325 +15 03 48.78 V C57
2021-09-21 14:43:58 s 1 +48096.358 0 +358845.57 7400.0 C57
2021-09-21 15:43:58 S 06 25 48.950 +15 03 42.73 V C57
2021-09-21 15:43:58 s 1 +45875.270 0 +359796.69 6000.0 C57
2021-09-21 15:53:58 S 06 25 49.241 +15 03 41.90 V C57
2021-09-21 15:53:58 s 1 +45504.585 0 +359951.39 7640.0 C57
2021-09-21 16:03:58 S 06 25 49.819 +15 03 40.39 V C57
2021-09-21 16:03:58 s 1 +45133.759 0 +360104.99 8870.0 C57
2021-09-21 16:13:58 S 06 25 50.309 +15 03 39.02 V C57
2021-09-21 16:13:58 s 1 +44762.794 0 +360257.51 9690.0 C57
2021-09-21 16:23:58 S 06 25 50.671 +15 03 39.42 V C57
2021-09-21 16:23:58 s 1 +44391.690 0 +360408.93 120.0 C57
2021-09-21 16:33:58 S 06 25 51.120 +15 03 37.44 V C57
2021-09-21 16:33:58 s 1 +44020.450 0 +360559.27 150.0 C57
2021-09-21 16:43:58 S 06 25 51.648 +15 03 37.33 V C57
2021-09-21 16:43:58 s 1 +43649.074 0 +360708.51 9790.0 C57
2021-09-21 16:53:58 S 06 25 52.130 +15 03 33.19 V C57
2021-09-21 16:53:58 s 1 +43277.563 0 +360856.66 9040.0 C57
2021-09-21 17:03:58 S 06 25 52.466 +15 03 34.81 V C57
2021-09-21 17:03:58 s 1 +42905.919 0 +361003.73 7910.0 C57
2021-09-21 18:13:58 S 06 25 55.608 +15 03 24.73 V C57
2021-09-21 18:13:58 s 1 +40300.781 0 +362002.74 9620.0 C57
2021-09-21 18:23:58 S 06 25 56.021 +15 03 24.08 V C57
2021-09-21 18:23:58 s 1 +39928.114 0 +362141.11 5580.0 C57
2021-09-21 18:43:58 S 06 25 56.906 +15 03 20.05 V C57
2021-09-21 18:43:58 s 1 +39182.414 0 +362414.59 6450.0 C57
2021-09-21 18:53:58 S 06 25 57.274 +15 03 21.20 V C57
2021-09-21 18:53:58 s 1 +38809.383 0 +362549.70 1370.0 C57
2021-09-21 19:13:58 S 06 25 58.066 +15 03 15.95 V C57
2021-09-21 19:13:58 s 1 +38062.966 0 +362816.68 230.0 C57
2021-09-21 19:33:58 S 06 25 59.186 +15 03 15.98 V C57
2021-09-21 19:33:58 s 1 +37316.083 0 +363079.33 7770.0 C57
2021-09-21 19:43:58 S 06 25 59.623 +15 03 13.82 V C57
2021-09-21 19:43:58 s 1 +36942.469 0 +363209.03 1060.0 C57
2021-09-21 20:03:58 S 06 26 00.444 +15 03 13.14 V C57
2021-09-21 20:03:58 s 1 +36194.905 0 +363465.18 6710.0 C57
2021-09-21 20:23:58 S 06 26 01.313 +15 03 11.99 V C57
2021-09-21 20:23:58 s 1 +35446.898 0 +363717.00 1130.0 C57
2021-09-21 20:43:58 S 06 26 02.249 +15 03 05.40 V C57
2021-09-21 20:43:58 s 1 +34698.458 0 +363964.51 4360.0 C57
2021-09-21 20:53:58 S 06 26 02.707 +15 03 04.75 V C57
2021-09-21 20:53:58 s 1 +34324.078 0 +364086.64 5530.0 C57
2021-09-21 21:03:58 S 06 26 03.036 +15 03 05.47 V C57
2021-09-21 21:03:58 s 1 +33949.594 0 +364207.69 6420.0 C57
2021-09-21 21:13:58 S 06 26 03.629 +15 03 02.45 V C57
2021-09-21 21:13:58 s 1 +33575.006 0 +364327.66 7020.0 C57
2021-09-21 21:23:58 S 06 26 04.015 +15 03 00.68 V C57
2021-09-21 21:23:58 s 1 +33200.316 0 +364446.56 7350.0 C57
2021-09-21 21:33:58 S 06 26 04.378 +15 03 00.22 V C57
2021-09-21 21:33:58 s 1 +32825.524 0 +364564.37 7400.0 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)