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
2021-11-24 19:43:55 s 1 +87567.984 0 +353962.33 660.0 C57
2021-11-24 19:53:55 S 06 34 42.106 +12 50 51.40 V C57
2021-11-24 19:53:55 s 1 +87242.748 0 +354197.72 9730.0 C57
2021-11-24 20:03:55 S 06 34 41.690 +12 50 51.76 V C57
2021-11-24 20:03:55 s 1 +86917.257 0 +354432.07 7980.0 C57
2021-11-24 20:13:55 S 06 34 41.208 +12 50 51.18 V C57
2021-11-24 20:13:55 s 1 +86591.510 0 +354665.37 5410.0 C57
2021-11-24 20:23:55 S 06 34 40.812 +12 50 51.58 V C57
2021-11-24 20:23:55 s 1 +86265.509 0 +354897.64 2030.0 C57
2021-11-24 20:33:55 S 06 34 40.337 +12 50 51.76 V C57
2021-11-24 20:33:55 s 1 +85939.255 0 +355128.85 7850.0 C57
2021-11-24 20:43:55 S 06 34 39.960 +12 50 51.07 V C57
2021-11-24 20:43:55 s 1 +85612.749 0 +355359.03 2860.0 C57
2021-11-24 20:53:55 S 06 34 39.437 +12 50 50.64 V C57
2021-11-24 20:53:55 s 1 +85285.994 0 +355588.17 7080.0 C57
2021-11-24 21:03:55 S 06 34 39.158 +12 50 47.54 V C57
2021-11-24 21:03:55 s 1 +84958.989 0 +355816.26 500.0 C57
2021-11-24 21:13:55 S 06 34 38.650 +12 50 49.52 V C57
2021-11-24 21:13:55 s 1 +84631.737 0 +356043.32 3140.0 C57
2021-11-24 21:23:55 S 06 34 38.196 +12 50 51.54 V C57
2021-11-24 21:23:55 s 1 +84304.238 0 +356269.33 4990.0 C57
2021-11-24 21:33:55 S 06 34 37.870 +12 50 52.26 V C57
2021-11-24 21:33:55 s 1 +83976.494 0 +356494.31 6070.0 C57
2021-11-24 21:43:55 S 06 34 37.366 +12 50 50.78 V C57
2021-11-24 21:43:55 s 1 +83648.505 0 +356718.24 6370.0 C57
2021-11-24 21:53:55 S 06 34 36.977 +12 50 51.61 V C57
2021-11-24 21:53:55 s 1 +83320.274 0 +356941.14 5900.0 C57
2021-11-25 02:33:55 S 06 34 24.718 +12 50 52.48 V C57
2021-11-25 02:33:55 s 1 +74036.186 0 +362762.58 9260.0 C57
2021-11-25 02:43:55 S 06 34 24.310 +12 50 51.72 V C57
2021-11-25 02:43:55 s 1 +73701.441 0 +362955.56 8480.0 C57
2021-11-25 02:53:55 S 06 34 23.966 +12 50 52.91 V C57
2021-11-25 02:53:55 s 1 +73366.489 0 +363147.52 7060.0 C57
2021-11-25 03:03:55 S 06 34 23.472 +12 50 52.80 V C57
2021-11-25 03:03:55 s 1 +73031.332 0 +363338.45 5010.0 C57
2021-11-25 03:13:55 S 06 34 23.052 +12 50 51.97 V C57
2021-11-25 03:13:55 s 1 +72695.970 0 +363528.36 2340.0 C57
2021-11-25 03:23:55 S 06 34 22.651 +12 50 52.33 V C57
2021-11-25 03:23:55 s 1 +72360.405 0 +363717.24 9050.0 C57
2021-11-25 03:33:55 S 06 34 22.109 +12 50 52.91 V C57
2021-11-25 03:33:55 s 1 +72024.637 0 +363905.10 5140.0 C57
2021-11-25 03:43:55 S 06 34 21.658 +12 50 51.76 V C57
2021-11-25 03:43:55 s 1 +71688.668 0 +364091.94 620.0 C57
2021-11-25 03:53:55 S 06 34 21.353 +12 50 53.63 V C57
2021-11-25 03:53:55 s 1 +71352.500 0 +364277.75 5490.0 C57
2021-11-25 04:03:55 S 06 34 20.777 +12 50 52.91 V C57
2021-11-25 04:03:55 s 1 +71016.132 0 +364462.54 9760.0 C57
2021-11-25 04:13:55 S 06 34 20.407 +12 50 54.06 V C57
2021-11-25 04:13:55 s 1 +70679.567 0 +364646.31 3430.0 C57
2021-11-25 04:23:55 S 06 34 19.975 +12 50 52.51 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)