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
2021-10-02 08:43:58 s 1 +159727.87 6 +242207.41 1100.0 C57
2021-10-02 08:53:58 S 06 36 23.018 +14 33 11.09 V C57
2021-10-02 08:53:58 s 1 +159513.62 9 +242765.82 5210.0 C57
2021-10-02 09:03:58 S 06 36 23.138 +14 33 13.75 V C57
2021-10-02 09:03:58 s 1 +159298.49 7 +243322.86 6460.0 C57
2021-10-02 09:13:58 S 06 36 23.518 +14 33 09.04 V C57
2021-10-02 09:13:58 s 1 +159082.48 4 +243878.53 4880.0 C57
2021-10-02 09:23:58 S 06 36 24.062 +14 33 08.06 V C57
2021-10-02 09:23:58 s 1 +158865.59 4 +244432.84 480.0 C57
2021-10-02 09:33:58 S 06 36 24.271 +14 33 06.98 V C57
2021-10-02 09:33:58 s 1 +158647.83 1 +244985.78 3270.0 C57
2021-10-02 09:43:58 S 06 36 24.667 +14 33 05.44 V C57
2021-10-02 09:43:58 s 1 +158429.20 0 +245537.36 3260.0 C57
2021-10-02 10:53:58 S 06 36 26.940 +14 32 57.66 V C57
2021-10-02 10:53:58 s 1 +156874.80 3 +249360.42 6050.0 C57
2021-10-02 11:03:58 S 06 36 27.221 +14 32 55.18 V C57
2021-10-02 11:03:58 s 1 +156649.36 9 +249901.15 4150.0 C57
2021-10-02 11:13:58 S 06 36 27.672 +14 32 53.95 V C57
2021-10-02 11:13:58 s 1 +156423.10 3 +250440.54 9580.0 C57
2021-10-02 11:23:58 S 06 36 28.056 +14 32 54.35 V C57
2021-10-02 11:23:58 s 1 +156196.00 8 +250978.58 2340.0 C57
2021-10-02 11:33:58 S 06 36 28.356 +14 32 53.12 V C57
2021-10-02 11:33:58 s 1 +155968.08 8 +251515.27 2450.0 C57
2021-10-02 11:43:58 S 06 36 28.745 +14 32 52.66 V C57
2021-10-02 11:43:58 s 1 +155739.34 8 +252050.62 9920.0 C57
2021-10-02 11:53:58 S 06 36 29.251 +14 32 53.34 V C57
2021-10-02 11:53:58 s 1 +155509.79 1 +252584.63 4760.0 C57
2021-10-02 12:03:58 S 06 36 29.542 +14 32 49.34 V C57
2021-10-02 12:03:58 s 1 +155279.42 0 +253117.29 6990.0 C57
2021-10-02 13:13:58 S 06 36 31.882 +14 32 39.52 V C57
2021-10-02 13:13:58 s 1 +153644.37 8 +256808.45 420.0 C57
2021-10-02 13:23:58 S 06 36 32.246 +14 32 40.85 V C57
2021-10-02 13:23:58 s 1 +153407.63 9 +257330.42 2180.0 C57
2021-10-02 13:33:58 S 06 36 32.503 +14 32 38.18 V C57
2021-10-02 13:33:58 s 1 +153170.11 9 +257851.06 1430.0 C57
2021-10-02 13:43:58 S 06 36 32.827 +14 32 37.86 V C57
2021-10-02 13:43:58 s 1 +152931.82 4 +258370.38 8190.0 C57
2021-10-02 13:53:58 S 06 36 33.214 +14 32 35.45 V C57
2021-10-02 13:53:58 s 1 +152692.75 6 +258888.36 2470.0 C57
2021-10-02 14:03:58 S 06 36 33.504 +14 32 33.40 V C57
2021-10-02 14:03:58 s 1 +152452.92 0 +259405.02 4270.0 C57
2021-10-02 14:13:58 S 06 36 33.638 +14 32 33.65 V C57
2021-10-02 14:13:58 s 1 +152212.31 8 +259920.36 3620.0 C57
2021-10-02 14:23:58 S 06 36 34.159 +14 32 31.85 V C57
2021-10-02 14:23:58 s 1 +151970.95 4 +260434.37 530.0 C57
2021-10-02 14:33:58 S 06 36 34.754 +14 32 32.39 V C57
2021-10-02 14:33:58 s 1 +151728.83 3 +260947.06 4990.0 C57
2021-10-02 15:43:58 S 06 36 36.895 +14 32 21.59 V C57
2021-10-02 15:43:58 s 1 +150013.04 8 +264498.98 9060.0 C57
2021-10-02 15:53:58 S 06 36 37.385 +14 32 22.67 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)