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
2021-11-16 07:23:55 S 06 41 37.606 +12 51 40.93 V C57
2021-11-16 07:23:55 s 1 -134816.02 8 +283791.08 4980.0 C57
2021-11-16 07:33:55 S 06 41 37.207 +12 51 40.18 V C57
2021-11-16 07:33:55 s 1 -135070.88 1 +283326.49 4860.0 C57
2021-11-16 07:43:55 S 06 41 36.888 +12 51 39.89 V C57
2021-11-16 07:43:55 s 1 -135325.13 4 +282860.63 2290.0 C57
2021-11-16 07:53:55 S 06 41 36.578 +12 51 38.77 V C57
2021-11-16 07:53:55 s 1 -135578.78 4 +282393.50 7250.0 C57
2021-11-16 08:03:55 S 06 41 36.247 +12 51 37.73 V C57
2021-11-16 08:03:55 s 1 -135831.82 8 +281925.12 9750.0 C57
2021-11-16 08:13:55 S 06 41 35.993 +12 51 36.50 V C57
2021-11-16 08:13:55 s 1 -136084.26 4 +281455.47 9770.0 C57
2021-11-16 08:23:55 S 06 41 35.630 +12 51 37.15 V C57
2021-11-16 08:23:55 s 1 -136336.08 8 +280984.55 7290.0 C57
2021-11-16 09:43:55 S 06 41 33.233 +12 51 33.70 V C57
2021-11-16 09:43:55 s 1 -138328.32 5 +277171.46 6410.0 C57
2021-11-16 09:53:55 S 06 41 32.971 +12 51 34.27 V C57
2021-11-16 09:53:55 s 1 -138574.51 7 +276689.09 1000.0 C57
2021-11-16 10:03:55 S 06 41 32.534 +12 51 32.72 V C57
2021-11-16 10:03:55 s 1 -138820.06 8 +276205.43 2990.0 C57
2021-11-16 10:13:55 S 06 41 32.306 +12 51 32.00 V C57
2021-11-16 10:13:55 s 1 -139064.97 6 +275720.49 2360.0 C57
2021-11-16 10:23:55 S 06 41 31.970 +12 51 31.10 V C57
2021-11-16 10:23:55 s 1 -139309.23 8 +275234.27 9100.0 C57
2021-11-16 10:33:55 S 06 41 31.702 +12 51 31.32 V C57
2021-11-16 10:33:55 s 1 -139552.85 0 +274746.76 3210.0 C57
2021-11-16 10:43:55 S 06 41 31.344 +12 51 30.56 V C57
2021-11-16 10:43:55 s 1 -139795.80 9 +274257.96 4660.0 C57
2021-11-16 10:53:55 S 06 41 31.094 +12 51 30.67 V C57
2021-11-16 10:53:55 s 1 -140038.11 3 +273767.88 3450.0 C57
2021-11-16 11:03:55 S 06 41 30.818 +12 51 29.81 V C57
2021-11-16 11:03:55 s 1 -140279.75 9 +273276.51 9570.0 C57
2021-11-16 11:06:17 C 06 41 36.59 +12 51 19.4 V T05
2021-11-16 11:09:35 C 06 41 36.47 +12 51 19.0 V T05
2021-11-16 11:15:31 C 06 41 36.30 +12 51 19.0 V T05
2021-11-16 11:22:48 C 06 41 36.09 +12 51 18.9 V T05
2021-11-16 11:53:55 S 06 41 29.213 +12 51 28.48 V C57
2021-11-16 11:53:55 s 1 -141477.99 8 +270800.26 9630.0 C57
2021-11-16 12:03:55 S 06 41 28.850 +12 51 27.29 V C57
2021-11-16 12:03:55 s 1 -141715.62 6 +270301.12 9450.0 C57
2021-11-16 12:13:55 S 06 41 28.649 +12 51 28.44 V C57
2021-11-16 12:13:55 s 1 -141952.57 4 +269800.68 6510.0 C57
2021-11-16 12:23:55 S 06 41 28.236 +12 51 25.56 V C57
2021-11-16 12:23:55 s 1 -142188.83 9 +269298.94 810.0 C57
2021-11-16 12:33:55 S 06 41 27.946 +12 51 25.85 V C57
2021-11-16 12:33:55 s 1 -142424.41 6 +268795.90 2320.0 C57
2021-11-16 12:43:55 S 06 41 27.631 +12 51 25.49 V C57
2021-11-16 12:43:55 s 1 -142659.30 3 +268291.55 1030.0 C57
2021-11-16 12:53:55 S 06 41 27.298 +12 51 25.45 V C57
2021-11-16 12:53:55 s 1 -142893.49 7 +267785.90 6940.0 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)