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
2021-09-23 10:03:58 s 1 -49729.954 0 +364765.69 4530.0 C57
2021-09-23 10:13:58 S 06 27 39.622 +14 58 31.98 V C57
2021-09-23 10:13:58 s 1 -50100.308 0 +364650.40 5430.0 C57
2021-09-23 10:53:58 S 06 27 41.431 +14 58 27.98 V C57
2021-09-23 10:53:58 s 1 -51580.307 0 +364178.67 3650.0 C57
2021-09-23 11:03:58 S 06 27 41.849 +14 58 24.17 V C57
2021-09-23 11:03:58 s 1 -51949.946 0 +364058.09 1840.0 C57
2021-09-23 11:13:58 S 06 27 42.276 +14 58 24.20 V C57
2021-09-23 11:13:58 s 1 -52319.439 0 +363936.44 9470.0 C57
2021-09-23 11:23:58 S 06 27 42.566 +14 58 21.18 V C57
2021-09-23 11:23:58 s 1 -52688.784 0 +363813.74 6540.0 C57
2021-09-23 11:33:58 S 06 27 43.104 +14 58 21.68 V C57
2021-09-23 11:33:58 s 1 -53057.980 0 +363689.98 3050.0 C57
2021-09-23 11:43:58 S 06 27 43.514 +14 58 19.20 V C57
2021-09-23 11:43:58 s 1 -53427.026 0 +363565.15 9000.0 C57
2021-09-23 11:53:58 S 06 27 43.973 +14 58 17.87 V C57
2021-09-23 11:53:58 s 1 -53795.921 0 +363439.27 4370.0 C57
2021-09-23 12:03:58 S 06 27 44.213 +14 58 15.20 V C57
2021-09-23 12:03:58 s 1 -54164.664 0 +363312.32 9170.0 C57
2021-09-23 12:13:58 S 06 27 44.810 +14 58 16.43 V C57
2021-09-23 12:13:58 s 1 -54533.253 0 +363184.31 3390.0 C57
2021-09-23 12:53:58 S 06 27 46.450 +14 58 10.70 V C57
2021-09-23 12:53:58 s 1 -56006.053 0 +362661.66 4420.0 C57
2021-09-23 13:03:58 S 06 27 47.256 +14 58 09.66 V C57
2021-09-23 13:03:58 s 1 -56373.853 0 +362528.36 5210.0 C57
2021-09-23 13:13:58 S 06 27 47.472 +14 58 06.42 V C57
2021-09-23 13:13:58 s 1 -56741.498 0 +362393.98 5910.0 C57
2021-09-23 13:23:58 S 06 27 47.527 +14 58 03.14 V C57
2021-09-23 13:23:58 s 1 -57108.981 0 +362258.54 5980.0 C57
2021-09-23 13:33:58 S 06 27 48.216 +14 58 06.42 V C57
2021-09-23 13:33:58 s 1 -57476.301 0 +362122.03 5440.0 C57
2021-09-23 13:43:58 S 06 27 48.679 +14 58 06.60 V C57
2021-09-23 13:43:58 s 1 -57843.458 0 +361984.46 4290.0 C57
2021-09-23 13:53:58 S 06 27 49.015 +14 58 05.66 V C57
2021-09-23 13:53:58 s 1 -58210.450 0 +361845.83 2530.0 C57
2021-09-23 14:03:58 S 06 27 49.433 +14 58 02.35 V C57
2021-09-23 14:03:58 s 1 -58577.275 0 +361706.13 140.0 C57
2021-09-23 14:13:58 S 06 27 49.810 +14 58 01.63 V C57
2021-09-23 14:13:58 s 1 -58943.933 0 +361565.37 7130.0 C57
2021-09-23 14:23:58 S 06 27 50.292 +14 58 01.06 V C57
2021-09-23 14:23:58 s 1 -59310.423 0 +361423.55 3490.0 C57
2021-09-23 14:33:58 S 06 27 50.779 +14 57 57.60 V C57
2021-09-23 14:33:58 s 1 -59676.742 0 +361280.66 9210.0 C57
2021-09-23 14:43:58 S 06 27 51.324 +14 57 55.62 V C57
2021-09-23 14:43:58 s 1 -60042.891 0 +361136.70 4300.0 C57
2021-09-23 14:53:58 S 06 27 51.718 +14 57 56.59 V C57
2021-09-23 14:53:58 s 1 -60408.867 0 +360991.69 8760.0 C57
2021-09-23 15:33:58 S 06 27 53.510 +14 57 53.57 V C57
2021-09-23 15:33:58 s 1 -61871.029 0 +360400.96 80.0 C57
2021-09-23 15:43:58 S 06 27 53.794 +14 57 49.14 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)