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
2021-11-22 04:43:55 s 1 +175474.71 6 +182973.85 9100.0 C57
2021-11-22 04:53:55 S 06 37 14.832 +12 50 37.61 V C57
2021-11-22 04:53:55 s 1 +175401.43 6 +183669.02 9840.0 C57
2021-11-22 05:03:55 S 06 37 14.508 +12 50 37.14 V C57
2021-11-22 05:03:55 s 1 +175326.74 1 +184362.72 5500.0 C57
2021-11-22 05:13:55 S 06 37 14.215 +12 50 36.85 V C57
2021-11-22 05:13:55 s 1 +175250.64 1 +185054.94 6120.0 C57
2021-11-22 05:23:55 S 06 37 13.687 +12 50 36.78 V C57
2021-11-22 05:23:55 s 1 +175173.14 1 +185745.70 1720.0 C57
2021-11-22 05:33:55 S 06 37 13.394 +12 50 37.03 V C57
2021-11-22 05:33:55 s 1 +175094.25 0 +186434.99 2330.0 C57
2021-11-22 05:43:55 S 06 37 12.912 +12 50 36.92 V C57
2021-11-22 05:43:55 s 1 +175013.97 4 +187122.81 7970.0 C57
2021-11-22 05:53:55 S 06 37 12.550 +12 50 35.59 V C57
2021-11-22 05:53:55 s 1 +174932.32 2 +187809.17 8670.0 C57
2021-11-22 06:03:55 S 06 37 12.238 +12 50 37.86 V C57
2021-11-22 06:03:55 s 1 +174849.30 0 +188494.07 4470.0 C57
2021-11-22 06:13:55 S 06 37 11.873 +12 50 39.19 V C57
2021-11-22 06:13:55 s 1 +174764.91 5 +189177.50 5380.0 C57
2021-11-22 07:03:55 S 06 37 10.078 +12 50 37.79 V C57
2021-11-22 07:03:55 s 1 +174322.80 1 +192572.83 7550.0 C57
2021-11-22 07:13:55 S 06 37 09.679 +12 50 38.90 V C57
2021-11-22 07:13:55 s 1 +174230.38 9 +193247.53 9690.0 C57
2021-11-22 07:23:55 S 06 37 09.194 +12 50 37.90 V C57
2021-11-22 07:23:55 s 1 +174136.66 3 +193920.79 7130.0 C57
2021-11-22 07:33:55 S 06 37 08.947 +12 50 37.32 V C57
2021-11-22 07:33:55 s 1 +174041.63 0 +194592.60 9880.0 C57
2021-11-22 07:43:55 S 06 37 08.621 +12 50 37.86 V C57
2021-11-22 07:43:55 s 1 +173945.29 8 +195262.97 7980.0 C57
2021-11-22 07:53:55 S 06 37 08.071 +12 50 38.22 V C57
2021-11-22 07:53:55 s 1 +173847.67 1 +195931.89 1440.0 C57
2021-11-22 08:03:55 S 06 37 07.735 +12 50 38.18 V C57
2021-11-22 08:03:55 s 1 +173748.75 8 +196599.37 300.0 C57
2021-11-22 08:13:55 S 06 37 07.368 +12 50 37.75 V C57
2021-11-22 08:13:55 s 1 +173648.56 4 +197265.41 4580.0 C57
2021-11-22 08:23:55 S 06 37 06.962 +12 50 38.26 V C57
2021-11-22 08:23:55 s 1 +173547.09 6 +197930.01 4290.0 C57
2021-11-22 08:33:55 S 06 37 06.506 +12 50 38.04 V C57
2021-11-22 08:33:55 s 1 +173444.36 2 +198593.17 9480.0 C57
2021-11-22 08:43:55 S 06 37 06.293 +12 50 37.86 V C57
2021-11-22 08:43:55 s 1 +173340.36 6 +199254.89 140.0 C57
2021-11-22 08:53:55 S 06 37 05.753 +12 50 36.31 V C57
2021-11-22 08:53:55 s 1 +173235.11 6 +199915.19 6330.0 C57
2021-11-22 09:13:55 S 06 37 05.062 +12 50 39.66 V C57
2021-11-22 09:13:55 s 1 +173020.87 8 +201231.48 5320.0 C57
2021-11-22 09:23:55 S 06 37 04.790 +12 50 38.11 V C57
2021-11-22 09:23:55 s 1 +172911.90 3 +201887.48 8170.0 C57
2021-11-22 09:33:55 S 06 37 04.274 +12 50 37.93 V C57
2021-11-22 09:33:55 s 1 +172801.69 8 +202542.06 6630.0 C57
2021-11-22 09:43:55 S 06 37 03.965 +12 50 39.05 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)