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
2021-10-14 15:53:57 s 1 +169135.13 4 +196732.04 430.0 C57
2021-10-14 16:03:57 S 06 44 36.072 +13 57 17.89 V C57
2021-10-14 16:03:57 s 1 +169009.53 1 +197397.44 4240.0 C57
2021-10-14 16:13:57 S 06 44 36.226 +13 57 15.55 V C57
2021-10-14 16:13:57 s 1 +168882.63 6 +198061.33 3720.0 C57
2021-10-14 18:23:57 S 06 44 38.772 +13 57 05.22 V C57
2021-10-14 18:23:57 s 1 +167118.52 2 +206555.53 3320.0 C57
2021-10-14 20:33:57 S 06 44 41.424 +13 56 49.24 V C57
2021-10-14 20:33:57 s 1 +165151.47 7 +214799.17 3140.0 C57
2021-10-14 22:53:57 S 06 44 44.170 +13 56 33.47 V C57
2021-10-14 22:53:57 s 1 +162821.15 1 +223401.14 1040.0 C57
2021-10-14 23:23:57 S 06 44 44.806 +13 56 31.60 V C57
2021-10-14 23:23:57 s 1 +162294.60 7 +225207.66 1050.0 C57
2021-10-15 01:33:57 S 06 44 47.311 +13 56 15.50 V C57
2021-10-15 01:33:57 s 1 +159907.40 9 +232887.72 4900.0 C57
2021-10-15 01:43:57 S 06 44 47.534 +13 56 14.28 V C57
2021-10-15 01:43:57 s 1 +159716.87 2 +233468.59 1340.0 C57
2021-10-15 03:33:57 S 06 44 49.685 +13 56 02.54 V C57
2021-10-15 03:33:57 s 1 +157558.43 6 +239765.66 3210.0 C57
2021-10-15 03:53:57 S 06 44 49.944 +13 56 01.43 V C57
2021-10-15 03:53:57 s 1 +157153.95 2 +240892.46 7860.0 C57
2021-10-15 04:03:57 S 06 44 50.206 +13 55 58.80 V C57
2021-10-15 04:03:57 s 1 +156950.35 1 +241453.79 660.0 C57
2021-10-15 06:13:57 S 06 44 52.690 +13 55 45.30 V C57
2021-10-15 06:13:57 s 1 +154223.19 1 +248625.63 8700.0 C57
2021-10-15 06:23:57 S 06 44 52.910 +13 55 44.22 V C57
2021-10-15 06:23:57 s 1 +154007.37 4 +249167.72 720.0 C57
2021-10-15 06:43:57 S 06 44 53.194 +13 55 41.70 V C57
2021-10-15 06:43:57 s 1 +153573.21 7 +250247.82 6330.0 C57
2021-10-15 10:36:59 C 06 44 46.88 +13 53 50.8 U I41
2021-10-15 11:13:57 S 06 44 58.178 +13 55 09.08 V C57
2021-10-15 11:13:57 s 1 +147397.89 1 +264302.14 9550.0 C57
2021-10-15 11:23:57 S 06 44 58.438 +13 55 08.90 V C57
2021-10-15 11:23:57 s 1 +147158.44 9 +264804.03 2830.0 C57
2021-10-15 11:34:37 C 06 44 47.92 +13 53 44.3 U I41
2021-10-15 13:13:57 S 06 45 00.425 +13 54 57.60 V C57
2021-10-15 13:13:57 s 1 +144476.99 5 +270238.17 490.0 C57
2021-10-15 13:33:57 S 06 45 00.770 +13 54 55.26 V C57
2021-10-15 13:33:57 s 1 +143980.28 1 +271209.21 7720.0 C57
2021-10-15 15:53:57 S 06 45 03.365 +13 54 40.21 V C57
2021-10-15 15:53:57 s 1 +140427.38 6 +277861.58 6090.0 C57
2021-10-15 16:03:57 S 06 45 03.506 +13 54 38.77 V C57
2021-10-15 16:03:57 s 1 +140168.65 5 +278327.10 5230.0 C57
2021-10-15 16:13:57 S 06 45 03.756 +13 54 38.70 V C57
2021-10-15 16:13:57 s 1 +139909.27 9 +278791.34 2240.0 C57
2021-10-15 20:23:57 S 06 45 08.354 +13 54 11.81 V C57
2021-10-15 20:23:57 s 1 +133223.69 9 +289985.12 50.0 C57
2021-10-15 20:33:57 S 06 45 08.450 +13 54 05.90 V C57
2021-10-15 20:33:57 s 1 +132948.54 8 +290416.53 4760.0 C57
2021-10-16 06:03:57 S 06 45 18.156 +13 53 00.60 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)