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
2021-09-25 02:13:58 s 1 -131977.19 8 +305636.33 5100.0 C57
2021-09-25 02:23:58 S 06 29 20.429 +14 53 23.68 V C57
2021-09-25 02:23:58 s 1 -132274.85 6 +305255.40 8120.0 C57
2021-09-25 02:33:58 S 06 29 20.712 +14 53 20.11 V C57
2021-09-25 02:33:58 s 1 -132572.01 3 +304873.30 9400.0 C57
2021-09-25 03:33:58 S 06 29 23.167 +14 53 10.68 V C57
2021-09-25 03:33:58 s 1 -134344.29 7 +302556.09 320.0 C57
2021-09-25 03:43:58 S 06 29 23.743 +14 53 14.53 V C57
2021-09-25 03:43:58 s 1 -134637.88 1 +302165.78 9270.0 C57
2021-09-25 03:53:58 S 06 29 23.906 +14 53 11.11 V C57
2021-09-25 03:53:58 s 1 -134930.94 7 +301774.29 6440.0 C57
2021-09-25 04:03:58 S 06 29 24.468 +14 53 07.33 V C57
2021-09-25 04:03:58 s 1 -135223.49 2 +301381.62 1800.0 C57
2021-09-25 04:13:58 S 06 29 24.701 +14 53 06.79 V C57
2021-09-25 04:13:58 s 1 -135515.51 3 +300987.78 5370.0 C57
2021-09-25 04:23:58 S 06 29 25.231 +14 53 06.04 V C57
2021-09-25 04:23:58 s 1 -135807.00 9 +300592.75 7120.0 C57
2021-09-25 04:33:58 S 06 29 25.666 +14 53 04.81 V C57
2021-09-25 04:33:58 s 1 -136097.97 7 +300196.55 7050.0 C57
2021-09-25 04:43:58 S 06 29 26.172 +14 53 01.50 V C57
2021-09-25 04:43:58 s 1 -136388.41 6 +299799.17 5160.0 C57
2021-09-25 04:53:58 S 06 29 26.434 +14 53 02.15 V C57
2021-09-25 04:53:58 s 1 -136678.32 2 +299400.60 1440.0 C57
2021-09-25 05:03:58 S 06 29 26.842 +14 53 02.58 V C57
2021-09-25 05:03:58 s 1 -136967.69 4 +299000.86 5870.0 C57
2021-09-25 06:13:58 S 06 29 29.539 +14 52 51.96 V C57
2021-09-25 06:13:58 s 1 -138978.14 4 +296169.45 4730.0 C57
2021-09-25 06:23:58 S 06 29 30.082 +14 52 49.26 V C57
2021-09-25 06:23:58 s 1 -139263.16 0 +295760.22 4170.0 C57
2021-09-25 06:33:58 S 06 29 30.605 +14 52 49.22 V C57
2021-09-25 06:33:58 s 1 -139547.62 0 +295349.80 1700.0 C57
2021-09-25 06:43:58 S 06 29 31.080 +14 52 47.17 V C57
2021-09-25 06:43:58 s 1 -139831.52 3 +294938.18 7310.0 C57
2021-09-25 06:53:58 S 06 29 31.322 +14 52 46.27 V C57
2021-09-25 06:53:58 s 1 -140114.86 7 +294525.37 1000.0 C57
2021-09-25 07:03:58 S 06 29 31.872 +14 52 44.87 V C57
2021-09-25 07:03:58 s 1 -140397.64 8 +294111.37 2750.0 C57
2021-09-25 07:13:58 S 06 29 32.146 +14 52 43.39 V C57
2021-09-25 07:13:58 s 1 -140679.86 6 +293696.18 2570.0 C57
2021-09-25 07:23:58 S 06 29 32.611 +14 52 41.66 V C57
2021-09-25 07:23:58 s 1 -140961.51 7 +293279.80 440.0 C57
2021-09-25 08:13:58 S 06 29 34.606 +14 52 33.60 V C57
2021-09-25 08:13:58 s 1 -142361.18 7 +291179.92 290.0 C57
2021-09-25 08:23:58 S 06 29 34.889 +14 52 38.60 V C57
2021-09-25 08:23:58 s 1 -142639.38 8 +290756.36 6310.0 C57
2021-09-25 08:33:58 S 06 29 35.611 +14 52 34.32 V C57
2021-09-25 08:33:58 s 1 -142917.00 5 +290331.59 320.0 C57
2021-09-25 08:43:58 S 06 29 35.971 +14 52 33.13 V C57
2021-09-25 08:43:58 s 1 -143194.03 6 +289905.62 2320.0 C57
2021-09-25 08:53:58 S 06 29 36.132 +14 52 31.01 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)