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 21:53:58 s 1 +84452.949 0 +336830.63 620.0 C57
2021-09-20 22:03:58 S 06 25 01.339 +15 05 50.21 V C57
2021-09-20 22:03:58 s 1 +84104.990 0 +337105.21 1610.0 C57
2021-09-20 22:13:58 S 06 25 01.918 +15 05 48.77 V C57
2021-09-20 22:13:58 s 1 +83756.742 0 +337378.63 1690.0 C57
2021-09-20 23:03:58 S 06 25 04.058 +15 05 40.06 V C57
2021-09-20 23:03:58 s 1 +82011.215 0 +338728.47 8700.0 C57
2021-09-20 23:13:58 S 06 25 04.418 +15 05 39.52 V C57
2021-09-20 23:13:58 s 1 +81661.264 0 +338994.98 3450.0 C57
2021-09-20 23:23:58 S 06 25 05.086 +15 05 38.87 V C57
2021-09-20 23:23:58 s 1 +81311.034 0 +339260.34 7340.0 C57
2021-09-20 23:33:58 S 06 25 05.561 +15 05 36.24 V C57
2021-09-20 23:33:58 s 1 +80960.528 0 +339524.56 370.0 C57
2021-09-20 23:43:58 S 06 25 05.880 +15 05 33.79 V C57
2021-09-20 23:43:58 s 1 +80609.747 0 +339787.63 2530.0 C57
2021-09-20 23:53:58 S 06 25 06.401 +15 05 32.28 V C57
2021-09-20 23:53:58 s 1 +80258.692 0 +340049.55 3840.0 C57
2021-09-21 00:03:58 S 06 25 06.624 +15 05 33.22 V C57
2021-09-21 00:03:58 s 1 +79907.365 0 +340310.32 4310.0 C57
2021-09-21 00:23:58 S 06 25 07.505 +15 05 32.60 V C57
2021-09-21 00:23:58 s 1 +79203.901 0 +340828.44 2710.0 C57
2021-09-21 00:33:58 S 06 25 08.047 +15 05 31.09 V C57
2021-09-21 00:33:58 s 1 +78851.767 0 +341085.78 660.0 C57
2021-09-21 00:43:58 S 06 25 08.928 +15 05 27.96 V C57
2021-09-21 00:43:58 s 1 +78499.367 0 +341341.97 7790.0 C57
2021-09-21 01:13:58 S 06 25 09.852 +15 05 24.43 V C57
2021-09-21 01:13:58 s 1 +77440.587 0 +342103.71 4240.0 C57
2021-09-21 01:23:58 S 06 25 10.445 +15 05 24.04 V C57
2021-09-21 01:23:58 s 1 +77087.139 0 +342355.34 8110.0 C57
2021-09-21 01:33:58 S 06 25 10.718 +15 05 22.92 V C57
2021-09-21 01:33:58 s 1 +76733.433 0 +342605.83 1170.0 C57
2021-09-21 01:43:58 S 06 25 11.266 +15 05 20.54 V C57
2021-09-21 01:43:58 s 1 +76379.469 0 +342855.18 3430.0 C57
2021-09-21 01:53:58 S 06 25 11.674 +15 05 21.59 V C57
2021-09-21 01:53:58 s 1 +76025.251 0 +343103.39 4910.0 C57
2021-09-21 02:03:58 S 06 25 12.139 +15 05 18.42 V C57
2021-09-21 02:03:58 s 1 +75670.778 0 +343350.46 5590.0 C57
2021-09-21 02:13:58 S 06 25 12.682 +15 05 19.25 V C57
2021-09-21 02:13:58 s 1 +75316.053 0 +343596.40 5500.0 C57
2021-09-21 02:23:58 S 06 25 13.229 +15 05 18.53 V C57
2021-09-21 02:23:58 s 1 +74961.078 0 +343841.20 4630.0 C57
2021-09-21 02:33:58 S 06 25 13.519 +15 05 16.08 V C57
2021-09-21 02:33:58 s 1 +74605.853 0 +344084.86 2980.0 C57
2021-09-21 02:43:58 S 06 25 14.088 +15 05 12.01 V C57
2021-09-21 02:43:58 s 1 +74250.380 0 +344327.39 570.0 C57
2021-09-21 03:33:58 S 06 25 16.322 +15 05 09.13 V C57
2021-09-21 03:33:58 s 1 +72469.350 0 +345523.02 7180.0 C57
2021-09-21 03:43:58 S 06 25 16.721 +15 05 10.25 V C57
2021-09-21 03:43:58 s 1 +72112.421 0 +345758.75 270.0 C57
2021-09-21 03:53:58 S 06 25 17.124 +15 05 06.43 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)