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
2021-09-24 10:53:58 s 1 -102706.92 7 +335771.45 6730.0 C57
2021-09-24 11:13:58 S 06 28 42.653 +14 55 15.85 V C57
2021-09-24 11:13:58 s 1 -103378.00 2 +335217.87 6750.0 C57
2021-09-24 11:23:58 S 06 28 43.320 +14 55 19.31 V C57
2021-09-24 11:23:58 s 1 -103713.03 4 +334939.41 9980.0 C57
2021-09-24 11:33:58 S 06 28 43.529 +14 55 16.90 V C57
2021-09-24 11:33:58 s 1 -104047.72 7 +334659.84 2020.0 C57
2021-09-24 11:53:58 S 06 28 44.520 +14 55 12.04 V C57
2021-09-24 11:53:58 s 1 -104716.09 1 +334097.37 2490.0 C57
2021-09-24 12:03:58 S 06 28 44.695 +14 55 11.10 V C57
2021-09-24 12:03:58 s 1 -105049.75 9 +333814.46 910.0 C57
2021-09-24 12:13:58 S 06 28 45.415 +14 55 11.39 V C57
2021-09-24 12:13:58 s 1 -105383.08 1 +333530.44 8120.0 C57
2021-09-24 12:23:58 S 06 28 45.893 +14 55 15.53 V C57
2021-09-24 12:23:58 s 1 -105716.05 7 +333245.31 4110.0 C57
2021-09-24 13:33:58 S 06 28 48.478 +14 55 04.33 V C57
2021-09-24 13:33:58 s 1 -108037.04 5 +331218.14 1430.0 C57
2021-09-24 13:43:58 S 06 28 48.962 +14 55 02.89 V C57
2021-09-24 13:43:58 s 1 -108367.18 9 +330924.07 7470.0 C57
2021-09-24 13:53:58 S 06 28 49.193 +14 54 59.08 V C57
2021-09-24 13:53:58 s 1 -108696.97 3 +330628.88 2240.0 C57
2021-09-24 14:03:58 S 06 28 49.745 +14 54 55.91 V C57
2021-09-24 14:03:58 s 1 -109026.39 3 +330332.58 5740.0 C57
2021-09-24 14:13:58 S 06 28 50.090 +14 54 57.64 V C57
2021-09-24 14:13:58 s 1 -109355.44 9 +330035.15 7960.0 C57
2021-09-24 14:23:58 S 06 28 50.544 +14 54 55.15 V C57
2021-09-24 14:23:58 s 1 -109684.14 0 +329736.61 8900.0 C57
2021-09-24 14:33:58 S 06 28 51.024 +14 54 57.96 V C57
2021-09-24 14:33:58 s 1 -110012.46 2 +329436.94 8540.0 C57
2021-09-24 15:23:58 S 06 28 52.846 +14 54 47.88 V C57
2021-09-24 15:23:58 s 1 -111648.50 1 +327921.77 7250.0 C57
2021-09-24 15:33:58 S 06 28 53.177 +14 54 43.42 V C57
2021-09-24 15:33:58 s 1 -111974.58 3 +327615.36 9040.0 C57
2021-09-24 15:43:58 S 06 28 53.986 +14 54 45.97 V C57
2021-09-24 15:43:58 s 1 -112300.28 5 +327307.83 9510.0 C57
2021-09-24 15:53:58 S 06 28 54.240 +14 54 45.18 V C57
2021-09-24 15:53:58 s 1 -112625.60 7 +326999.17 8650.0 C57
2021-09-24 16:03:58 S 06 28 54.701 +14 54 42.44 V C57
2021-09-24 16:03:58 s 1 -112950.54 5 +326689.38 6440.0 C57
2021-09-24 16:13:58 S 06 28 55.147 +14 54 40.21 V C57
2021-09-24 16:13:58 s 1 -113275.09 9 +326378.47 2890.0 C57
2021-09-24 16:23:58 S 06 28 55.632 +14 54 40.36 V C57
2021-09-24 16:23:58 s 1 -113599.26 7 +326066.43 7990.0 C57
2021-09-24 16:33:58 S 06 28 55.944 +14 54 39.89 V C57
2021-09-24 16:33:58 s 1 -113923.04 7 +325753.26 1740.0 C57
2021-09-24 19:03:58 S 06 29 02.292 +14 54 17.89 V C57
2021-09-24 19:03:58 s 1 -118732.03 1 +320919.89 1270.0 C57
2021-09-24 19:13:58 S 06 29 02.520 +14 54 17.78 V C57
2021-09-24 19:13:58 s 1 -119049.36 9 +320588.58 2540.0 C57
2021-09-24 19:23:58 S 06 29 03.199 +14 54 15.80 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)