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
2021-09-20 03:43:58 s 1 +120248.89 7 +299789.24 2380.0 C57
2021-09-20 03:53:58 S 06 24 11.407 +15 07 49.94 V C57
2021-09-20 03:53:58 s 1 +119943.38 9 +300194.93 8600.0 C57
2021-09-20 04:03:58 S 06 24 11.988 +15 07 50.59 V C57
2021-09-20 04:03:58 s 1 +119637.38 0 +300599.37 3190.0 C57
2021-09-20 04:13:58 S 06 24 12.480 +15 07 48.47 V C57
2021-09-20 04:13:58 s 1 +119330.87 0 +301002.55 6180.0 C57
2021-09-20 04:23:58 S 06 24 12.929 +15 07 48.25 V C57
2021-09-20 04:23:58 s 1 +119023.86 3 +301404.47 7570.0 C57
2021-09-20 04:33:58 S 06 24 13.447 +15 07 45.44 V C57
2021-09-20 04:33:58 s 1 +118716.36 1 +301805.14 7360.0 C57
2021-09-20 04:53:58 S 06 24 14.208 +15 07 44.26 V C57
2021-09-20 04:53:58 s 1 +118099.88 0 +302602.72 2200.0 C57
2021-09-20 05:03:58 S 06 24 14.798 +15 07 44.80 V C57
2021-09-20 05:03:58 s 1 +117790.90 6 +302999.63 7260.0 C57
2021-09-20 05:13:58 S 06 24 15.096 +15 07 42.49 V C57
2021-09-20 05:13:58 s 1 +117481.44 6 +303395.29 760.0 C57
2021-09-20 05:23:58 S 06 24 15.660 +15 07 40.15 V C57
2021-09-20 05:23:58 s 1 +117171.50 3 +303789.70 2700.0 C57
2021-09-20 06:03:58 S 06 24 17.383 +15 07 35.47 V C57
2021-09-20 06:03:58 s 1 +115926.94 2 +305354.89 5090.0 C57
2021-09-20 06:13:58 S 06 24 17.945 +15 07 32.34 V C57
2021-09-20 06:13:58 s 1 +115614.61 6 +305743.07 9380.0 C57
2021-09-20 06:23:58 S 06 24 18.372 +15 07 32.88 V C57
2021-09-20 06:23:58 s 1 +115301.82 0 +306130.01 2160.0 C57
2021-09-20 06:33:58 S 06 24 18.905 +15 07 29.89 V C57
2021-09-20 06:33:58 s 1 +114988.55 7 +306515.71 3440.0 C57
2021-09-20 06:43:58 S 06 24 19.354 +15 07 30.50 V C57
2021-09-20 06:43:58 s 1 +114674.82 9 +306900.17 3230.0 C57
2021-09-20 06:53:58 S 06 24 19.870 +15 07 30.25 V C57
2021-09-20 06:53:58 s 1 +114360.63 7 +307283.40 1530.0 C57
2021-09-20 07:03:58 S 06 24 20.150 +15 07 28.13 V C57
2021-09-20 07:03:58 s 1 +114045.98 5 +307665.38 8350.0 C57
2021-09-20 07:13:58 S 06 24 20.743 +15 07 28.63 V C57
2021-09-20 07:13:58 s 1 +113730.87 5 +308046.13 3700.0 C57
2021-09-20 07:23:58 S 06 24 21.199 +15 07 28.13 V C57
2021-09-20 07:23:58 s 1 +113415.30 8 +308425.64 7590.0 C57
2021-09-20 07:33:58 S 06 24 21.583 +15 07 25.68 V C57
2021-09-20 07:33:58 s 1 +113099.28 8 +308803.91 20.0 C57
2021-09-20 07:53:58 S 06 24 22.594 +15 07 23.70 V C57
2021-09-20 07:53:58 s 1 +112465.89 3 +309556.77 550.0 C57
2021-09-20 08:23:58 S 06 24 23.789 +15 07 19.45 V C57
2021-09-20 08:23:58 s 1 +111512.45 0 +310676.81 600.0 C57
2021-09-20 08:33:58 S 06 24 24.377 +15 07 18.19 V C57
2021-09-20 08:33:58 s 1 +111193.75 1 +311047.71 4440.0 C57
2021-09-20 08:43:58 S 06 24 24.970 +15 07 19.52 V C57
2021-09-20 08:43:58 s 1 +110874.61 2 +311417.37 6890.0 C57
2021-09-20 08:53:58 S 06 24 25.229 +15 07 15.64 V C57
2021-09-20 08:53:58 s 1 +110555.03 8 +311785.81 7930.0 C57
2021-09-20 09:03:58 S 06 24 25.745 +15 07 15.53 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)