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
2021-10-13 08:33:57 s 1 +158176.60 1 +43527.722 7400.0 C57
2021-10-13 09:03:57 S 06 43 54.876 +14 00 28.01 V C57
2021-10-13 09:03:57 s 1 +159159.41 4 +46400.804 6930.0 C57
2021-10-13 09:13:57 S 06 43 55.126 +14 00 27.79 V C57
2021-10-13 09:13:57 s 1 +159478.33 7 +47355.999 7440.0 C57
2021-10-13 10:38:10 C 06 43 47.99 +13 59 30.5 U I41
2021-10-13 11:39:39 C 06 43 49.26 +13 59 23.5 U I41
2021-10-13 13:13:57 S 06 44 00.864 +14 00 03.82 V C57
2021-10-13 13:13:57 s 1 +165921.32 2 +69873.578 9290.0 C57
2021-10-13 13:23:57 S 06 44 00.919 +14 00 05.58 V C57
2021-10-13 13:23:57 s 1 +166142.59 2 +70793.838 90.0 C57
2021-10-13 13:43:57 S 06 44 01.464 +13 59 58.92 V C57
2021-10-13 13:43:57 s 1 +166574.57 0 +72629.840 6050.0 C57
2021-10-13 15:43:57 S 06 44 04.375 +13 59 49.88 V C57
2021-10-13 15:43:57 s 1 +168881.43 5 +83517.047 500.0 C57
2021-10-13 15:53:57 S 06 44 04.668 +13 59 49.09 V C57
2021-10-13 15:53:57 s 1 +169052.42 1 +84414.190 1700.0 C57
2021-10-13 16:03:57 S 06 44 04.891 +13 59 48.37 V C57
2021-10-13 16:03:57 s 1 +169220.24 7 +85309.757 2250.0 C57
2021-10-13 16:13:57 S 06 44 05.004 +13 59 47.00 V C57
2021-10-13 16:13:57 s 1 +169384.93 7 +86203.743 2230.0 C57
2021-10-13 18:03:57 S 06 44 07.558 +13 59 35.99 V C57
2021-10-13 18:03:57 s 1 +170995.84 2 +95932.356 5610.0 C57
2021-10-13 18:13:57 S 06 44 07.798 +13 59 35.05 V C57
2021-10-13 18:13:57 s 1 +171124.59 9 +96807.138 4500.0 C57
2021-10-13 18:23:57 S 06 44 08.086 +13 59 33.07 V C57
2021-10-13 18:23:57 s 1 +171250.49 7 +97680.303 3750.0 C57
2021-10-13 18:33:57 S 06 44 08.282 +13 59 31.96 V C57
2021-10-13 18:33:57 s 1 +171373.55 7 +98551.849 3430.0 C57
2021-10-13 20:23:57 S 06 44 10.776 +13 59 21.37 V C57
2021-10-13 20:23:57 s 1 +172545.38 6 +108031.56 7540.0 C57
2021-10-13 20:33:57 S 06 44 11.040 +13 59 21.23 V C57
2021-10-13 20:33:57 s 1 +172635.87 3 +108883.56 7520.0 C57
2021-10-13 20:43:57 S 06 44 11.237 +13 59 20.40 V C57
2021-10-13 20:43:57 s 1 +172723.76 4 +109733.93 8760.0 C57
2021-10-13 20:53:57 S 06 44 11.568 +13 59 21.16 V C57
2021-10-13 20:53:57 s 1 +172809.07 7 +110582.66 1320.0 C57
2021-10-13 21:03:57 S 06 44 11.724 +13 59 18.24 V C57
2021-10-13 21:03:57 s 1 +172891.83 0 +111429.75 5270.0 C57
2021-10-13 22:33:57 S 06 44 13.766 +13 59 08.70 V C57
2021-10-13 22:33:57 s 1 +173524.17 0 +118979.80 2240.0 C57
2021-10-13 22:43:57 S 06 44 13.898 +13 59 07.04 V C57
2021-10-13 22:43:57 s 1 +173582.23 8 +119810.49 3090.0 C57
2021-10-13 22:53:57 S 06 44 14.107 +13 59 06.65 V C57
2021-10-13 22:53:57 s 1 +173637.92 7 +120639.53 5940.0 C57
2021-10-13 23:03:57 S 06 44 14.371 +13 59 04.60 V C57
2021-10-13 23:03:57 s 1 +173691.25 2 +121466.94 820.0 C57
2021-10-13 23:13:57 S 06 44 14.621 +13 59 05.10 V C57
2021-10-13 23:13:57 s 1 +173742.22 8 +122292.70 7810.0 C57
2021-10-13 23:23:57 S 06 44 14.813 +13 59 01.32 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)