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
2021-10-13 23:23:57 s 1 +173790.87 1 +123116.83 6940.0 C57
2021-10-13 23:33:57 S 06 44 15.055 +13 59 01.25 V C57
2021-10-13 23:33:57 s 1 +173837.19 6 +123939.31 8280.0 C57
2021-10-13 23:43:57 S 06 44 15.168 +13 59 01.68 V C57
2021-10-13 23:43:57 s 1 +173881.21 7 +124760.15 1860.0 C57
2021-10-14 01:13:57 S 06 44 17.321 +13 58 53.26 V C57
2021-10-14 01:13:57 s 1 +174176.18 7 +132073.91 3580.0 C57
2021-10-14 01:23:57 S 06 44 17.628 +13 58 51.17 V C57
2021-10-14 01:23:57 s 1 +174197.97 6 +132878.36 2380.0 C57
2021-10-14 03:53:57 S 06 44 20.813 +13 58 35.00 V C57
2021-10-14 03:53:57 s 1 +174274.62 8 +144749.18 3020.0 C57
2021-10-14 04:03:57 S 06 44 21.029 +13 58 32.77 V C57
2021-10-14 04:03:57 s 1 +174263.63 8 +145527.55 1600.0 C57
2021-10-14 04:13:57 S 06 44 21.218 +13 58 33.31 V C57
2021-10-14 04:13:57 s 1 +174250.70 4 +146304.30 3650.0 C57
2021-10-14 06:03:57 S 06 44 23.642 +13 58 23.56 V C57
2021-10-14 06:03:57 s 1 +173983.50 7 +154741.83 6350.0 C57
2021-10-14 06:13:57 S 06 44 23.822 +13 58 23.09 V C57
2021-10-14 06:13:57 s 1 +173948.15 1 +155499.21 3050.0 C57
2021-10-14 06:33:57 S 06 44 24.266 +13 58 22.30 V C57
2021-10-14 06:33:57 s 1 +173872.06 0 +157009.16 8380.0 C57
2021-10-14 08:43:57 S 06 44 27.038 +13 58 05.41 V C57
2021-10-14 08:43:57 s 1 +173208.00 0 +166668.11 8790.0 C57
2021-10-14 09:03:57 S 06 44 27.468 +13 58 04.84 V C57
2021-10-14 09:03:57 s 1 +173080.61 2 +168130.27 1840.0 C57
2021-10-14 10:53:57 S 06 44 29.712 +13 57 52.92 V C57
2021-10-14 10:53:57 s 1 +172265.58 5 +176059.56 4560.0 C57
2021-10-14 11:03:57 S 06 44 29.762 +13 57 49.93 V C57
2021-10-14 11:03:57 s 1 +172182.14 3 +176771.01 9790.0 C57
2021-10-14 11:13:57 S 06 44 30.137 +13 57 50.44 V C57
2021-10-14 11:13:57 s 1 +172097.18 0 +177480.89 9920.0 C57
2021-10-14 11:23:57 S 06 44 30.259 +13 57 48.60 V C57
2021-10-14 11:23:57 s 1 +172010.70 6 +178189.21 4980.0 C57
2021-10-14 12:40:21 C 06 44 20.93 +13 56 26.7 V T08
2021-10-14 12:44:20 C 06 44 21.00 +13 56 26.1 V T08
2021-10-14 13:07:54 C 06 44 21.45 +13 56 23.4 V T08
2021-10-14 13:13:57 S 06 44 32.575 +13 57 36.54 V C57
2021-10-14 13:13:57 s 1 +170963.39 7 +185879.18 1340.0 C57
2021-10-14 13:17:16 C 06 44 21.64 +13 56 22.4 V T08
2021-10-14 13:23:57 S 06 44 32.695 +13 57 35.53 V C57
2021-10-14 13:23:57 s 1 +170859.42 4 +186568.94 7680.0 C57
2021-10-14 13:33:57 S 06 44 33.067 +13 57 34.02 V C57
2021-10-14 13:33:57 s 1 +170754.04 4 +187257.16 9300.0 C57
2021-10-14 13:43:57 S 06 44 33.317 +13 57 34.45 V C57
2021-10-14 13:43:57 s 1 +170647.26 4 +187943.86 6220.0 C57
2021-10-14 14:03:57 S 06 44 33.612 +13 57 31.21 V C57
2021-10-14 14:03:57 s 1 +170429.53 6 +189312.64 6080.0 C57
2021-10-14 15:43:57 S 06 44 35.650 +13 57 18.76 V C57
2021-10-14 15:43:57 s 1 +169259.43 9 +196065.13 2270.0 C57
2021-10-14 15:53:57 S 06 44 35.870 +13 57 18.29 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)