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
2021-11-23 09:23:55 s 1 +146878.61 0 +282255.50 7800.0 C57
2021-11-23 09:33:55 S 06 36 08.129 +12 50 45.82 V C57
2021-11-23 09:33:55 s 1 +146640.31 8 +282720.95 2440.0 C57
2021-11-23 09:43:55 S 06 36 07.658 +12 50 46.64 V C57
2021-11-23 09:43:55 s 1 +146401.39 3 +283185.19 4860.0 C57
2021-11-23 09:53:55 S 06 36 07.313 +12 50 45.85 V C57
2021-11-23 09:53:55 s 1 +146161.83 7 +283648.22 5080.0 C57
2021-11-23 10:03:55 S 06 36 06.902 +12 50 45.35 V C57
2021-11-23 10:03:55 s 1 +145921.65 4 +284110.04 3110.0 C57
2021-11-23 10:13:55 S 06 36 06.480 +12 50 46.14 V C57
2021-11-23 10:13:55 s 1 +145680.84 6 +284570.65 8960.0 C57
2021-11-23 10:23:55 S 06 36 06.106 +12 50 46.39 V C57
2021-11-23 10:23:55 s 1 +145439.41 5 +285030.06 2630.0 C57
2021-11-23 10:33:55 S 06 36 05.688 +12 50 45.96 V C57
2021-11-23 10:33:55 s 1 +145197.36 5 +285488.25 4150.0 C57
2021-11-23 10:43:55 S 06 36 05.251 +12 50 45.92 V C57
2021-11-23 10:43:55 s 1 +144954.69 8 +285945.24 3500.0 C57
2021-11-23 10:53:55 S 06 36 04.855 +12 50 46.90 V C57
2021-11-23 10:53:55 s 1 +144711.41 7 +286401.03 720.0 C57
2021-11-23 11:03:55 S 06 36 04.498 +12 50 45.92 V C57
2021-11-23 11:03:55 s 1 +144467.52 4 +286855.61 5800.0 C57
2021-11-23 11:13:55 S 06 36 04.066 +12 50 46.03 V C57
2021-11-23 11:13:55 s 1 +144223.02 1 +287308.99 8750.0 C57
2021-11-23 11:23:55 S 06 36 03.653 +12 50 45.24 V C57
2021-11-23 11:23:55 s 1 +143977.91 2 +287761.17 9590.0 C57
2021-11-23 11:33:55 S 06 36 03.238 +12 50 46.36 V C57
2021-11-23 11:33:55 s 1 +143732.19 9 +288212.15 8320.0 C57
2021-11-23 11:43:55 S 06 36 02.849 +12 50 45.31 V C57
2021-11-23 11:43:55 s 1 +143485.88 4 +288661.93 4960.0 C57
2021-11-23 11:53:55 S 06 36 02.474 +12 50 47.36 V C57
2021-11-23 11:53:55 s 1 +143238.97 1 +289110.51 9510.0 C57
2021-11-23 12:03:55 S 06 36 02.095 +12 50 47.04 V C57
2021-11-23 12:03:55 s 1 +142991.46 1 +289557.90 1980.0 C57
2021-11-23 12:13:55 S 06 36 01.644 +12 50 45.85 V C57
2021-11-23 12:13:55 s 1 +142743.35 7 +290004.09 2380.0 C57
2021-11-23 12:23:55 S 06 36 01.217 +12 50 46.61 V C57
2021-11-23 12:23:55 s 1 +142494.66 2 +290449.09 730.0 C57
2021-11-23 12:33:55 S 06 36 00.847 +12 50 47.36 V C57
2021-11-23 12:33:55 s 1 +142245.37 8 +290892.89 7020.0 C57
2021-11-23 12:43:55 S 06 36 00.427 +12 50 45.89 V C57
2021-11-23 12:43:55 s 1 +141995.50 7 +291335.50 1270.0 C57
2021-11-23 12:53:55 S 06 36 00.024 +12 50 47.18 V C57
2021-11-23 12:53:55 s 1 +141745.05 3 +291776.92 3490.0 C57
2021-11-23 13:03:55 S 06 35 59.587 +12 50 45.96 V C57
2021-11-23 13:03:55 s 1 +141494.01 7 +292217.15 3680.0 C57
2021-11-23 13:13:55 S 06 35 59.213 +12 50 46.00 V C57
2021-11-23 13:13:55 s 1 +141242.40 2 +292656.20 1870.0 C57
2021-11-23 13:23:55 S 06 35 58.879 +12 50 46.97 V C57
2021-11-23 13:23:55 s 1 +140990.21 0 +293094.05 8040.0 C57
2021-11-23 13:33:55 S 06 35 58.327 +12 50 46.03 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)