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 21:23:58 s 1 -74534.875 0 +354502.83 380.0 C57
2021-09-23 21:33:58 S 06 28 08.342 +14 57 04.39 V C57
2021-09-23 21:33:58 s 1 -74892.974 0 +354315.01 5920.0 C57
2021-09-23 21:43:58 S 06 28 09.127 +14 57 04.00 V C57
2021-09-23 21:43:58 s 1 -75250.851 0 +354126.12 660.0 C57
2021-09-23 21:53:58 S 06 28 09.302 +14 57 02.48 V C57
2021-09-23 21:53:58 s 1 -75608.504 0 +353936.14 4580.0 C57
2021-09-23 22:03:58 S 06 28 09.859 +14 57 01.98 V C57
2021-09-23 22:03:58 s 1 -75965.933 0 +353745.10 7690.0 C57
2021-09-23 22:53:58 S 06 28 11.777 +14 56 53.66 V C57
2021-09-23 22:53:58 s 1 -77749.656 0 +352773.69 850.0 C57
2021-09-23 23:03:58 S 06 28 12.266 +14 56 52.80 V C57
2021-09-23 23:03:58 s 1 -78105.708 0 +352576.18 8980.0 C57
2021-09-23 23:13:58 S 06 28 12.761 +14 56 52.87 V C57
2021-09-23 23:13:58 s 1 -78461.525 0 +352377.58 6250.0 C57
2021-09-23 23:23:58 S 06 28 13.078 +14 56 52.69 V C57
2021-09-23 23:23:58 s 1 -78817.108 0 +352177.91 2680.0 C57
2021-09-23 23:33:58 S 06 28 13.574 +14 56 48.77 V C57
2021-09-23 23:33:58 s 1 -79172.454 0 +351977.16 8260.0 C57
2021-09-23 23:43:58 S 06 28 13.867 +14 56 46.64 V C57
2021-09-23 23:43:58 s 1 -79527.563 0 +351775.32 2970.0 C57
2021-09-23 23:53:58 S 06 28 14.374 +14 56 45.10 V C57
2021-09-23 23:53:58 s 1 -79882.432 0 +351572.41 6830.0 C57
2021-09-24 00:03:58 S 06 28 14.664 +14 56 47.44 V C57
2021-09-24 00:03:58 s 1 -80237.061 0 +351368.42 9810.0 C57
2021-09-24 00:13:58 S 06 28 15.166 +14 56 42.14 V C57
2021-09-24 00:13:58 s 1 -80591.448 0 +351163.34 1930.0 C57
2021-09-24 01:23:58 S 06 28 18.022 +14 56 34.73 V C57
2021-09-24 01:23:58 s 1 -83065.276 0 +349697.51 1940.0 C57
2021-09-24 01:33:58 S 06 28 18.482 +14 56 38.04 V C57
2021-09-24 01:33:58 s 1 -83417.682 0 +349483.77 6930.0 C57
2021-09-24 01:43:58 S 06 28 18.989 +14 56 33.83 V C57
2021-09-24 01:43:58 s 1 -83769.833 0 +349268.95 1000.0 C57
2021-09-24 01:53:58 S 06 28 19.291 +14 56 32.60 V C57
2021-09-24 01:53:58 s 1 -84121.730 0 +349053.04 4150.0 C57
2021-09-24 02:03:58 S 06 28 19.812 +14 56 30.37 V C57
2021-09-24 02:03:58 s 1 -84473.370 0 +348836.05 6380.0 C57
2021-09-24 02:13:58 S 06 28 20.208 +14 56 29.08 V C57
2021-09-24 02:13:58 s 1 -84824.753 0 +348617.97 7690.0 C57
2021-09-24 02:23:58 S 06 28 20.628 +14 56 29.80 V C57
2021-09-24 02:23:58 s 1 -85175.876 0 +348398.81 8070.0 C57
2021-09-24 02:33:58 S 06 28 20.978 +14 56 25.33 V C57
2021-09-24 02:33:58 s 1 -85526.739 0 +348178.56 7520.0 C57
2021-09-24 03:43:58 S 06 28 24.079 +14 56 18.82 V C57
2021-09-24 03:43:58 s 1 -87975.373 0 +346606.35 7120.0 C57
2021-09-24 03:53:58 S 06 28 24.396 +14 56 16.87 V C57
2021-09-24 03:53:58 s 1 -88324.104 0 +346377.39 8930.0 C57
2021-09-24 04:03:58 S 06 28 24.766 +14 56 13.45 V C57
2021-09-24 04:03:58 s 1 -88672.561 0 +346147.35 9770.0 C57
2021-09-24 04:13:58 S 06 28 25.248 +14 56 13.38 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)