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
2021-11-11 00:33:55 S 06 45 00.578 +12 58 05.27 V C57
2021-11-11 00:33:55 s 1 +116214.30 3 +323986.62 9800.0 C57
2021-11-11 00:43:55 S 06 45 00.420 +12 58 04.76 V C57
2021-11-11 00:43:55 s 1 +115920.72 9 +324327.41 4720.0 C57
2021-11-11 00:53:55 S 06 45 00.156 +12 58 03.83 V C57
2021-11-11 00:53:55 s 1 +115626.75 3 +324667.09 8280.0 C57
2021-11-11 01:03:55 S 06 44 59.969 +12 58 03.04 V C57
2021-11-11 01:03:55 s 1 +115332.37 9 +325005.66 500.0 C57
2021-11-11 03:23:55 S 06 44 56.921 +12 57 54.97 V C57
2021-11-11 03:23:55 s 1 +111170.20 1 +329629.34 3950.0 C57
2021-11-11 03:33:55 S 06 44 56.724 +12 57 55.12 V C57
2021-11-11 03:33:55 s 1 +110870.04 5 +329951.32 6750.0 C57
2021-11-11 05:13:55 S 06 44 54.542 +12 57 50.40 V C57
2021-11-11 05:13:55 s 1 +107848.28 9 +333110.88 7170.0 C57
2021-11-11 05:23:55 S 06 44 54.324 +12 57 49.82 V C57
2021-11-11 05:23:55 s 1 +107544.12 8 +333420.82 6570.0 C57
2021-11-11 05:43:55 S 06 44 53.822 +12 57 49.75 V C57
2021-11-11 05:43:55 s 1 +106934.74 6 +334037.43 1840.0 C57
2021-11-11 08:03:55 S 06 44 50.676 +12 57 41.72 V C57
2021-11-11 08:03:55 s 1 +102630.39 9 +338232.01 9970.0 C57
2021-11-11 08:13:55 S 06 44 50.474 +12 57 40.46 V C57
2021-11-11 08:13:55 s 1 +102320.42 2 +338523.50 20.0 C57
2021-11-11 10:13:55 S 06 44 47.911 +12 57 35.96 V C57
2021-11-11 10:13:55 s 1 +98575.480 0 +341937.49 7130.0 C57
2021-11-11 10:23:55 S 06 44 47.520 +12 57 33.77 V C57
2021-11-11 10:23:55 s 1 +98261.345 0 +342215.02 3430.0 C57
2021-11-11 10:43:55 S 06 44 47.042 +12 57 32.11 V C57
2021-11-11 10:43:55 s 1 +97632.148 0 +342766.85 2960.0 C57
2021-11-11 11:59:23 C 06 44 35.47 +12 55 56.0 V T08
2021-11-11 12:02:02 C 06 44 35.42 +12 55 55.9 V T08
2021-11-11 12:06:00 C 06 44 35.32 +12 55 55.7 V T08
2021-11-11 12:15:57 C 06 44 35.10 +12 55 55.2 V T08
2021-11-11 12:23:55 S 06 44 44.779 +12 57 27.79 V C57
2021-11-11 12:23:55 s 1 +94467.975 0 +345462.01 790.0 C57
2021-11-11 13:03:55 S 06 44 43.814 +12 57 25.63 V C57
2021-11-11 13:03:55 s 1 +93195.053 0 +346510.98 990.0 C57
2021-11-11 13:13:55 S 06 44 43.637 +12 57 24.73 V C57
2021-11-11 13:13:55 s 1 +92875.782 0 +346770.36 480.0 C57
2021-11-11 15:03:55 S 06 44 41.088 +12 57 18.76 V C57
2021-11-11 15:03:55 s 1 +89345.922 0 +349554.16 5740.0 C57
2021-11-11 17:53:55 S 06 44 37.145 +12 57 10.19 V C57
2021-11-11 17:53:55 s 1 +83826.703 0 +353605.96 7910.0 C57
2021-11-11 19:53:55 S 06 44 34.289 +12 57 03.20 V C57
2021-11-11 19:53:55 s 1 +79886.984 0 +356284.19 9560.0 C57
2021-11-12 00:23:55 S 06 44 27.996 +12 56 48.70 V C57
2021-11-12 00:23:55 s 1 +70902.160 0 +361764.66 550.0 C57
2021-11-12 00:33:55 S 06 44 27.696 +12 56 48.66 V C57
2021-11-12 00:33:55 s 1 +70566.407 0 +361953.22 7150.0 C57
2021-11-12 03:13:55 S 06 44 23.914 +12 56 41.53 V C57
2021-11-12 03:13:55 s 1 +65167.694 0 +364830.84 150.0 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)