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 19:23:58 s 1 -119366.29 0 +320256.13 2350.0 C57
2021-09-24 19:33:58 S 06 29 03.410 +14 54 14.83 V C57
2021-09-24 19:33:58 s 1 -119682.79 0 +319922.54 690.0 C57
2021-09-24 20:23:58 S 06 29 05.551 +14 54 10.37 V C57
2021-09-24 20:23:58 s 1 -121258.93 8 +318237.47 310.0 C57
2021-09-24 20:33:58 S 06 29 05.827 +14 54 09.68 V C57
2021-09-24 20:33:58 s 1 -121572.88 3 +317897.03 9760.0 C57
2021-09-24 20:43:58 S 06 29 06.463 +14 54 06.01 V C57
2021-09-24 20:43:58 s 1 -121886.39 5 +317555.45 7710.0 C57
2021-09-24 20:53:58 S 06 29 06.662 +14 54 04.57 V C57
2021-09-24 20:53:58 s 1 -122199.47 4 +317212.71 4150.0 C57
2021-09-24 21:03:58 S 06 29 07.082 +14 54 01.94 V C57
2021-09-24 21:03:58 s 1 -122512.11 6 +316868.83 9080.0 C57
2021-09-24 21:13:58 S 06 29 07.632 +14 54 03.42 V C57
2021-09-24 21:13:58 s 1 -122824.32 1 +316523.81 2480.0 C57
2021-09-24 21:23:58 S 06 29 08.069 +14 54 03.20 V C57
2021-09-24 21:23:58 s 1 -123136.08 5 +316177.64 4360.0 C57
2021-09-24 21:33:58 S 06 29 08.467 +14 53 59.78 V C57
2021-09-24 21:33:58 s 1 -123447.40 8 +315830.32 4700.0 C57
2021-09-24 21:43:58 S 06 29 08.806 +14 53 58.20 V C57
2021-09-24 21:43:58 s 1 -123758.28 7 +315481.85 3500.0 C57
2021-09-24 22:53:58 S 06 29 11.770 +14 53 50.96 V C57
2021-09-24 22:53:58 s 1 -125921.85 7 +313010.34 1420.0 C57
2021-09-24 23:03:58 S 06 29 12.077 +14 53 47.36 V C57
2021-09-24 23:03:58 s 1 -126229.11 8 +312652.65 7660.0 C57
2021-09-24 23:13:58 S 06 29 12.530 +14 53 46.03 V C57
2021-09-24 23:13:58 s 1 -126535.91 7 +312293.81 2310.0 C57
2021-09-24 23:23:58 S 06 29 13.001 +14 53 46.10 V C57
2021-09-24 23:23:58 s 1 -126842.25 4 +311933.82 5350.0 C57
2021-09-24 23:33:58 S 06 29 13.354 +14 53 43.94 V C57
2021-09-24 23:33:58 s 1 -127148.12 5 +311572.67 6780.0 C57
2021-09-24 23:43:58 S 06 29 13.836 +14 53 44.02 V C57
2021-09-24 23:43:58 s 1 -127453.53 0 +311210.36 6590.0 C57
2021-09-24 23:53:58 S 06 29 14.088 +14 53 40.42 V C57
2021-09-24 23:53:58 s 1 -127758.46 6 +310846.89 4780.0 C57
2021-09-25 00:03:58 S 06 29 14.414 +14 53 40.81 V C57
2021-09-25 00:03:58 s 1 -128062.93 1 +310482.26 1340.0 C57
2021-09-25 00:13:58 S 06 29 14.902 +14 53 39.98 V C57
2021-09-25 00:13:58 s 1 -128366.92 3 +310116.48 6260.0 C57
2021-09-25 01:23:58 S 06 29 18.065 +14 53 29.04 V C57
2021-09-25 01:23:58 s 1 -130481.45 4 +307523.44 4270.0 C57
2021-09-25 01:33:58 S 06 29 18.360 +14 53 24.76 V C57
2021-09-25 01:33:58 s 1 -130781.59 0 +307148.35 5850.0 C57
2021-09-25 01:43:58 S 06 29 18.708 +14 53 27.13 V C57
2021-09-25 01:43:58 s 1 -131081.23 4 +306772.10 5730.0 C57
2021-09-25 01:53:58 S 06 29 19.150 +14 53 24.00 V C57
2021-09-25 01:53:58 s 1 -131380.38 5 +306394.68 3900.0 C57
2021-09-25 02:03:58 S 06 29 19.584 +14 53 24.68 V C57
2021-09-25 02:03:58 s 1 -131679.04 0 +306016.09 360.0 C57
2021-09-25 02:13:58 S 06 29 20.033 +14 53 21.95 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)