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
2021-09-18 13:13:58 S 06 22 20.909 +15 11 53.77 V C57
2021-09-18 13:13:58 s 1 +170460.80 8 +169420.95 2610.0 C57
2021-09-18 13:23:58 S 06 22 21.682 +15 11 53.41 V C57
2021-09-18 13:23:58 s 1 +170371.97 4 +170157.01 6300.0 C57
2021-09-18 13:33:58 S 06 22 22.128 +15 11 50.78 V C57
2021-09-18 13:33:58 s 1 +170281.51 9 +170891.44 4680.0 C57
2021-09-18 13:43:58 S 06 22 22.639 +15 11 49.49 V C57
2021-09-18 13:43:58 s 1 +170189.45 3 +171624.25 7760.0 C57
2021-09-18 13:53:58 S 06 22 23.167 +15 11 50.50 V C57
2021-09-18 13:53:58 s 1 +170095.78 5 +172355.44 5590.0 C57
2021-09-18 14:03:58 S 06 22 23.743 +15 11 48.30 V C57
2021-09-18 14:03:58 s 1 +170000.52 5 +173085.01 8180.0 C57
2021-09-18 14:13:58 S 06 22 24.214 +15 11 48.34 V C57
2021-09-18 14:13:58 s 1 +169903.68 2 +173812.96 5570.0 C57
2021-09-18 14:23:58 S 06 22 24.650 +15 11 46.07 V C57
2021-09-18 14:23:58 s 1 +169805.26 4 +174539.29 7800.0 C57
2021-09-18 14:33:58 S 06 22 25.234 +15 11 45.71 V C57
2021-09-18 14:33:58 s 1 +169705.28 1 +175264.01 4880.0 C57
2021-09-18 14:43:58 S 06 22 25.733 +15 11 44.52 V C57
2021-09-18 14:43:58 s 1 +169603.74 3 +175987.11 6850.0 C57
2021-09-18 14:44:18 C 06 22 16.67 +15 10 35.9 V T05
2021-09-18 14:48:54 C 06 22 16.89 +15 10 35.6 V T05
2021-09-18 14:53:58 S 06 22 26.208 +15 11 41.03 V C57
2021-09-18 14:53:58 s 1 +169500.65 6 +176708.60 3740.0 C57
2021-09-18 15:03:58 S 06 22 26.674 +15 11 43.58 V C57
2021-09-18 15:03:58 s 1 +169396.03 2 +177428.48 5580.0 C57
2021-09-18 15:09:47 C 06 22 17.89 +15 10 33.3 V T05
2021-09-18 15:33:58 S 06 22 28.010 +15 11 37.39 V C57
2021-09-18 15:33:58 s 1 +169073.01 5 +179578.48 1080.0 C57
2021-09-18 15:53:58 S 06 22 29.059 +15 11 37.03 V C57
2021-09-18 15:53:58 s 1 +168850.13 7 +181003.79 20.0 C57
2021-09-18 16:03:58 S 06 22 29.333 +15 11 39.30 V C57
2021-09-18 16:03:58 s 1 +168736.46 4 +181714.04 2150.0 C57
2021-09-18 16:13:58 S 06 22 29.978 +15 11 34.66 V C57
2021-09-18 16:13:58 s 1 +168621.31 2 +182422.70 9430.0 C57
2021-09-18 16:23:58 S 06 22 30.528 +15 11 34.58 V C57
2021-09-18 16:23:58 s 1 +168504.69 1 +183129.76 1890.0 C57
2021-09-18 16:33:58 S 06 22 31.025 +15 11 34.87 V C57
2021-09-18 16:33:58 s 1 +168386.60 8 +183835.22 9550.0 C57
2021-09-18 16:43:58 S 06 22 31.502 +15 11 34.44 V C57
2021-09-18 16:43:58 s 1 +168267.07 1 +184539.09 2430.0 C57
2021-09-18 16:53:58 S 06 22 31.949 +15 11 31.85 V C57
2021-09-18 16:53:58 s 1 +168146.08 8 +185241.37 580.0 C57
2021-09-18 17:03:58 S 06 22 32.438 +15 11 32.10 V C57
2021-09-18 17:03:58 s 1 +168023.66 9 +185942.06 4000.0 C57
2021-09-18 17:33:58 S 06 22 33.809 +15 11 28.86 V C57
2021-09-18 17:33:58 s 1 +167647.86 6 +188034.61 6240.0 C57
2021-09-18 17:53:58 S 06 22 34.906 +15 11 26.84 V C57
2021-09-18 17:53:58 s 1 +167390.28 9 +189421.72 1300.0 C57
2021-09-18 18:03:58 S 06 22 35.371 +15 11 24.14 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)