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 15:43:58 s 1 -62236.127 0 +360250.62 1270.0 C57
2021-09-23 15:53:58 S 06 27 54.259 +14 57 47.20 V C57
2021-09-23 15:53:58 s 1 -62601.046 0 +360099.21 1800.0 C57
2021-09-23 16:03:58 S 06 27 54.559 +14 57 45.11 V C57
2021-09-23 16:03:58 s 1 -62965.784 0 +359946.73 1660.0 C57
2021-09-23 16:13:58 S 06 27 54.994 +14 57 45.97 V C57
2021-09-23 16:13:58 s 1 -63330.341 0 +359793.18 850.0 C57
2021-09-23 16:23:58 S 06 27 55.534 +14 57 45.32 V C57
2021-09-23 16:23:58 s 1 -63694.715 0 +359638.57 9360.0 C57
2021-09-23 16:33:58 S 06 27 55.805 +14 57 42.30 V C57
2021-09-23 16:33:58 s 1 -64058.905 0 +359482.90 7190.0 C57
2021-09-23 16:43:58 S 06 27 56.290 +14 57 42.73 V C57
2021-09-23 16:43:58 s 1 -64422.910 0 +359326.15 4340.0 C57
2021-09-23 16:53:58 S 06 27 56.753 +14 57 40.46 V C57
2021-09-23 16:53:58 s 1 -64786.728 0 +359168.34 800.0 C57
2021-09-23 17:03:58 S 06 27 57.060 +14 57 38.34 V C57
2021-09-23 17:03:58 s 1 -65150.358 0 +359009.46 6570.0 C57
2021-09-23 17:43:58 S 06 27 58.709 +14 57 30.74 V C57
2021-09-23 17:43:58 s 1 -66602.979 0 +358363.25 2640.0 C57
2021-09-23 18:03:58 S 06 27 59.623 +14 57 30.67 V C57
2021-09-23 18:03:58 s 1 -67328.133 0 +358033.73 6430.0 C57
2021-09-23 18:13:58 S 06 28 00.048 +14 57 33.23 V C57
2021-09-23 18:13:58 s 1 -67690.415 0 +357867.37 7240.0 C57
2021-09-23 18:23:58 S 06 28 00.533 +14 57 29.66 V C57
2021-09-23 18:23:58 s 1 -68052.501 0 +357699.93 7330.0 C57
2021-09-23 18:33:58 S 06 28 00.864 +14 57 28.19 V C57
2021-09-23 18:33:58 s 1 -68414.388 0 +357531.43 6690.0 C57
2021-09-23 18:43:58 S 06 28 01.404 +14 57 27.04 V C57
2021-09-23 18:43:58 s 1 -68776.075 0 +357361.85 5310.0 C57
2021-09-23 18:53:58 S 06 28 01.644 +14 57 26.42 V C57
2021-09-23 18:53:58 s 1 -69137.561 0 +357191.21 3200.0 C57
2021-09-23 19:03:58 S 06 28 02.218 +14 57 24.48 V C57
2021-09-23 19:03:58 s 1 -69498.844 0 +357019.49 350.0 C57
2021-09-23 19:13:58 S 06 28 02.657 +14 57 21.96 V C57
2021-09-23 19:13:58 s 1 -69859.924 0 +356846.71 6760.0 C57
2021-09-23 19:23:58 S 06 28 02.998 +14 57 23.29 V C57
2021-09-23 19:23:58 s 1 -70220.800 0 +356672.85 2420.0 C57
2021-09-23 19:33:58 S 06 28 03.389 +14 57 22.68 V C57
2021-09-23 19:33:58 s 1 -70581.469 0 +356497.91 7320.0 C57
2021-09-23 20:33:58 S 06 28 06.041 +14 57 12.10 V C57
2021-09-23 20:33:58 s 1 -72741.088 0 +355425.80 700.0 C57
2021-09-23 20:43:58 S 06 28 06.478 +14 57 08.39 V C57
2021-09-23 20:43:58 s 1 -73100.280 0 +355243.35 220.0 C57
2021-09-23 20:53:58 S 06 28 06.802 +14 57 10.44 V C57
2021-09-23 20:53:58 s 1 -73459.256 0 +355059.83 8950.0 C57
2021-09-23 21:03:58 S 06 28 07.207 +14 57 07.09 V C57
2021-09-23 21:03:58 s 1 -73818.015 0 +354875.24 6890.0 C57
2021-09-23 21:13:58 S 06 28 07.685 +14 57 06.73 V C57
2021-09-23 21:13:58 s 1 -74176.555 0 +354689.57 4030.0 C57
2021-09-23 21:23:58 S 06 28 08.076 +14 57 05.40 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)