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
2021-12-02 00:53:54 s 1 -139259.08 1 +11675.648 2100.0 C57
2021-12-02 01:03:54 S 06 26 27.415 +12 52 43.54 V C57
2021-12-02 01:03:54 s 1 -138758.14 8 +10670.532 2650.0 C57
2021-12-02 01:13:54 S 06 26 26.954 +12 52 43.07 V C57
2021-12-02 01:13:54 s 1 -138251.26 6 + 9664.950 9610.0 C57
2021-12-02 01:23:54 S 06 26 26.489 +12 52 43.28 V C57
2021-12-02 01:23:54 s 1 -137738.38 0 + 8658.940 2780.0 C57
2021-12-02 01:33:54 S 06 26 25.872 +12 52 44.76 V C57
2021-12-02 01:33:54 s 1 -137219.44 0 + 7652.542 1950.0 C57
2021-12-02 01:43:54 S 06 26 25.409 +12 52 44.76 V C57
2021-12-02 01:43:54 s 1 -136694.39 0 + 6645.795 6920.0 C57
2021-12-02 01:53:54 S 06 26 25.030 +12 52 45.88 V C57
2021-12-02 01:53:54 s 1 -136163.17 8 + 5638.740 7500.0 C57
2021-12-02 02:03:54 S 06 26 24.504 +12 52 45.62 V C57
2021-12-02 02:03:54 s 1 -135625.74 8 + 4631.420 3470.0 C57
2021-12-02 02:13:54 S 06 26 24.038 +12 52 45.12 V C57
2021-12-02 02:13:54 s 1 -135082.04 7 + 3623.877 4640.0 C57
2021-12-02 02:23:54 S 06 26 23.513 +12 52 45.23 V C57
2021-12-02 02:23:54 s 1 -134532.01 9 + 2616.157 780.0 C57
2021-12-02 02:33:54 S 06 26 23.009 +12 52 46.16 V C57
2021-12-02 02:33:54 s 1 -133975.60 9 + 1608.304 1690.0 C57
2021-12-02 02:43:54 S 06 26 22.421 +12 52 47.93 V C57
2021-12-02 02:43:54 s 1 -133412.76 0 + 600.366 7160.0 C57
2021-12-02 02:53:54 S 06 26 21.967 +12 52 47.57 V C57
2021-12-02 02:53:54 s 1 -132843.41 6 - 407.609 6980.0 C57
2021-12-03 10:22:22 C 06 24 54.82 +12 54 52.5 q U55
2021-12-03 10:40:40 C 06 24 53.83 +12 54 54.7 q U55
2021-12-03 10:55:24 C 06 24 53.07 +12 54 54.7 q U55
2021-12-11 22:30:29 C 06 13 38.76 +13 08 22.1 u M15
2021-12-11 23:01:57 C 06 13 36.88 +13 08 24.1 u M15
2021-12-11 23:17:09 C 06 13 35.95 +13 08 25.5 u M15
2021-12-11 23:46:48 C 06 13 34.29 +13 08 27.3 u M15
2021-12-12 00:08:59 C 06 13 32.83 +13 08 29.9 u M15
2021-12-12 00:19:21 C 06 13 32.29 +13 08 30.9 u M15
2021-12-12 00:29:41 C 06 13 31.70 +13 08 32.0 u M15
2021-12-12 00:56:23 C 06 13 30.07 +13 08 33.9 V K83
2021-12-12 00:56:57 C 06 13 30.06 +13 08 33.9 V K83
2021-12-12 00:57:33 C 06 13 30.01 +13 08 34.2 V K83
2021-12-18 12:47:11 C 06 04 17.43 +13 23 50.9 q E89
2021-12-18 12:58:41 C 06 04 16.73 +13 23 52.2 q E89
2021-12-18 13:10:22 C 06 04 15.97 +13 23 53.8 q E89
2021-12-18 13:20:40 C 06 04 15.37 +13 23 54.8 q E89
2021-12-23 05:31:37 C 05 57 35.28 +13 36 54.6 q W29
2021-12-23 05:42:48 C 05 57 34.62 +13 36 56.3 q W29
2021-12-23 06:03:42 C 05 57 33.36 +13 36 58.7 q W29
2021-12-23 12:42:02 C 05 57 09.68 +13 37 50.3 V T05
2021-12-23 12:47:59 C 05 57 09.32 +13 37 51.1 V T05
2021-12-23 12:57:14 C 05 57 08.76 +13 37 52.1 V T05
2021-12-25 10:08:22 C 05 54 30.29 +13 43 40.9 V T08
2021-12-25 10:53:11 C 05 54 27.61 +13 43 46.7 V T08
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)