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
2021-11-12 03:23:55 S 06 44 23.671 +12 56 40.38 V C57
2021-11-12 03:23:55 s 1 +64828.665 0 +365002.00 6640.0 C57
2021-11-12 03:43:55 S 06 44 23.280 +12 56 38.36 V C57
2021-11-12 03:43:55 s 1 +64150.060 0 +365341.27 7950.0 C57
2021-11-12 05:03:55 S 06 44 21.242 +12 56 36.74 V C57
2021-11-12 05:03:55 s 1 +61428.507 0 +366657.61 1530.0 C57
2021-11-12 05:13:55 S 06 44 21.012 +12 56 34.58 V C57
2021-11-12 05:13:55 s 1 +61087.528 0 +366817.58 2110.0 C57
2021-11-12 05:23:55 S 06 44 20.786 +12 56 34.84 V C57
2021-11-12 05:23:55 s 1 +60746.379 0 +366976.53 2170.0 C57
2021-11-12 05:33:55 S 06 44 20.489 +12 56 33.94 V C57
2021-11-12 05:33:55 s 1 +60405.060 0 +367134.46 1730.0 C57
2021-11-12 05:43:55 S 06 44 20.388 +12 56 33.00 V C57
2021-11-12 05:43:55 s 1 +60063.573 0 +367291.38 780.0 C57
2021-11-12 05:53:55 S 06 44 20.110 +12 56 31.56 V C57
2021-11-12 05:53:55 s 1 +59721.918 0 +367447.28 9320.0 C57
2021-11-12 07:33:55 S 06 44 17.690 +12 56 27.24 V C57
2021-11-12 07:33:55 s 1 +56296.395 0 +368950.56 8090.0 C57
2021-11-12 07:43:55 S 06 44 17.453 +12 56 27.67 V C57
2021-11-12 07:43:55 s 1 +55952.969 0 +369095.32 1390.0 C57
2021-11-12 07:53:55 S 06 44 17.174 +12 56 26.45 V C57
2021-11-12 07:53:55 s 1 +55609.387 0 +369239.07 4230.0 C57
2021-11-12 08:03:55 S 06 44 16.963 +12 56 26.38 V C57
2021-11-12 08:03:55 s 1 +55265.653 0 +369381.80 6610.0 C57
2021-11-12 08:13:55 S 06 44 16.642 +12 56 25.40 V C57
2021-11-12 08:13:55 s 1 +54921.765 0 +369523.53 8560.0 C57
2021-11-12 08:23:55 S 06 44 16.399 +12 56 23.82 V C57
2021-11-12 08:23:55 s 1 +54577.726 0 +369664.24 60.0 C57
2021-11-12 10:03:55 S 06 44 13.898 +12 56 19.72 V C57
2021-11-12 10:03:55 s 1 +51129.229 0 +371015.87 1560.0 C57
2021-11-12 10:23:55 S 06 44 13.548 +12 56 17.41 V C57
2021-11-12 10:23:55 s 1 +50437.815 0 +371274.09 4940.0 C57
2021-11-12 10:53:55 S 06 44 12.725 +12 56 16.91 V C57
2021-11-12 10:53:55 s 1 +49399.660 0 +371653.88 2070.0 C57
2021-11-12 12:33:55 S 06 44 10.289 +12 56 11.18 V C57
2021-11-12 12:33:55 s 1 +45930.523 0 +372854.46 4970.0 C57
2021-11-12 12:43:55 S 06 44 10.063 +12 56 10.86 V C57
2021-11-12 12:43:55 s 1 +45582.905 0 +372968.99 6310.0 C57
2021-11-12 12:53:55 S 06 44 09.744 +12 56 10.72 V C57
2021-11-12 12:53:55 s 1 +45235.164 0 +373082.52 7310.0 C57
2021-11-12 14:53:55 S 06 44 06.823 +12 56 04.67 V C57
2021-11-12 14:53:55 s 1 +41052.972 0 +374366.64 4190.0 C57
2021-11-12 15:03:55 S 06 44 06.437 +12 56 02.51 V C57
2021-11-12 15:03:55 s 1 +40703.712 0 +374467.13 1110.0 C57
2021-11-12 15:13:55 S 06 44 06.194 +12 56 02.80 V C57
2021-11-12 15:13:55 s 1 +40354.341 0 +374566.63 7750.0 C57
2021-11-12 15:23:55 S 06 44 05.986 +12 56 01.64 V C57
2021-11-12 15:23:55 s 1 +40004.862 0 +374665.13 4100.0 C57
2021-11-12 15:33:55 S 06 44 05.719 +12 56 02.69 V C57
2021-11-12 15:33:55 s 1 +39655.274 0 +374762.62 180.0 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)