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
2021-10-03 01:03:58 S 06 36 55.613 +14 31 14.95 V C57
2021-10-03 01:03:58 s 1 +135088.91 2 +290636.60 2530.0 C57
2021-10-03 01:13:58 S 06 36 56.076 +14 31 15.20 V C57
2021-10-03 01:13:58 s 1 +134804.86 3 +291067.28 2720.0 C57
2021-10-03 01:23:58 S 06 36 56.338 +14 31 14.12 V C57
2021-10-03 01:23:58 s 1 +134520.25 2 +291496.71 1110.0 C57
2021-10-03 01:33:58 S 06 36 56.714 +14 31 09.55 V C57
2021-10-03 01:33:58 s 1 +134235.08 1 +291924.90 7720.0 C57
2021-10-03 01:43:58 S 06 36 57.002 +14 31 10.24 V C57
2021-10-03 01:43:58 s 1 +133949.35 3 +292351.85 2550.0 C57
2021-10-03 01:53:58 S 06 36 57.341 +14 31 09.80 V C57
2021-10-03 01:53:58 s 1 +133663.07 0 +292777.56 5600.0 C57
2021-10-03 02:03:58 S 06 36 57.703 +14 31 09.66 V C57
2021-10-03 02:03:58 s 1 +133376.23 4 +293202.03 6900.0 C57
2021-10-03 02:13:58 S 06 36 57.936 +14 31 08.15 V C57
2021-10-03 02:13:58 s 1 +133088.84 9 +293625.26 6440.0 C57
2021-10-03 02:23:58 S 06 36 58.354 +14 31 05.48 V C57
2021-10-03 02:23:58 s 1 +132800.91 6 +294047.26 4230.0 C57
2021-10-03 02:30:13 S 06 36 49.14 +14 29 44.6 L C51
2021-10-03 03:13:58 S 06 37 00.142 +14 31 01.92 V C57
2021-10-03 03:13:58 s 1 +131353.13 2 +296138.72 7290.0 C57
2021-10-03 03:23:58 S 06 37 00.418 +14 30 58.10 V C57
2021-10-03 03:23:58 s 1 +131061.96 8 +296553.32 4780.0 C57
2021-10-03 03:33:58 S 06 37 00.737 +14 30 57.49 V C57
2021-10-03 03:33:58 s 1 +130770.27 4 +296966.68 580.0 C57
2021-10-03 03:43:58 S 06 37 01.085 +14 30 56.05 V C57
2021-10-03 03:43:58 s 1 +130478.05 3 +297378.82 4700.0 C57
2021-10-03 04:03:58 S 06 37 01.675 +14 30 55.01 V C57
2021-10-03 04:03:58 s 1 +129892.03 6 +298199.42 7920.0 C57
2021-10-03 04:13:58 S 06 37 02.100 +14 30 52.74 V C57
2021-10-03 04:13:58 s 1 +129598.24 7 +298607.88 7040.0 C57
2021-10-03 04:23:58 S 06 37 02.465 +14 30 52.27 V C57
2021-10-03 04:23:58 s 1 +129303.93 9 +299015.12 4510.0 C57
2021-10-03 04:33:58 S 06 37 02.777 +14 30 50.87 V C57
2021-10-03 04:33:58 s 1 +129009.11 6 +299421.13 340.0 C57
2021-10-03 05:53:58 S 06 37 05.273 +14 30 43.27 V C57
2021-10-03 05:53:58 s 1 +126632.24 9 +302625.33 8740.0 C57
2021-10-03 06:03:58 S 06 37 05.693 +14 30 38.95 V C57
2021-10-03 06:03:58 s 1 +126332.89 0 +303020.38 120.0 C57
2021-10-03 06:13:58 S 06 37 05.856 +14 30 39.06 V C57
2021-10-03 06:13:58 s 1 +126033.03 9 +303414.21 9940.0 C57
2021-10-03 06:23:58 S 06 37 06.317 +14 30 38.74 V C57
2021-10-03 06:23:58 s 1 +125732.69 8 +303806.84 8210.0 C57
2021-10-03 06:33:58 S 06 37 06.670 +14 30 33.55 V C57
2021-10-03 06:33:58 s 1 +125431.86 9 +304198.25 4910.0 C57
2021-10-03 06:43:58 S 06 37 06.802 +14 30 33.80 V C57
2021-10-03 06:43:58 s 1 +125130.55 4 +304588.46 80.0 C57
2021-10-03 06:53:58 S 06 37 07.457 +14 30 33.34 V C57
2021-10-03 06:53:58 s 1 +124828.75 6 +304977.45 3710.0 C57
2021-10-03 07:03:58 S 06 37 07.752 +14 30 32.87 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)