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
2021-11-28 23:03:54 s 1 -114568.11 3 +314563.58 7110.0 C57
2021-11-28 23:13:54 S 06 30 06.122 +12 51 19.91 V C57
2021-11-28 23:13:54 s 1 -114857.47 8 +314183.55 5500.0 C57
2021-11-28 23:23:54 S 06 30 05.695 +12 51 20.59 V C57
2021-11-28 23:23:54 s 1 -115146.40 7 +313802.35 1980.0 C57
2021-11-28 23:33:54 S 06 30 05.170 +12 51 21.17 V C57
2021-11-28 23:33:54 s 1 -115434.90 0 +313419.99 6540.0 C57
2021-11-28 23:43:54 S 06 30 04.682 +12 51 20.74 V C57
2021-11-28 23:43:54 s 1 -115722.95 3 +313036.45 9180.0 C57
2021-11-28 23:53:54 S 06 30 04.169 +12 51 19.62 V C57
2021-11-28 23:53:54 s 1 -116010.56 5 +312651.75 9880.0 C57
2021-11-29 00:03:54 S 06 30 03.638 +12 51 20.92 V C57
2021-11-29 00:03:54 s 1 -116297.73 4 +312265.87 8640.0 C57
2021-11-29 00:13:54 S 06 30 03.235 +12 51 20.38 V C57
2021-11-29 00:13:54 s 1 -116584.45 7 +311878.82 5450.0 C57
2021-11-29 00:23:54 S 06 30 02.690 +12 51 20.52 V C57
2021-11-29 00:23:54 s 1 -116870.73 4 +311490.60 300.0 C57
2021-11-29 00:33:54 S 06 30 02.196 +12 51 20.84 V C57
2021-11-29 00:33:54 s 1 -117156.56 1 +311101.21 3180.0 C57
2021-11-29 00:43:54 S 06 30 01.752 +12 51 21.49 V C57
2021-11-29 00:43:54 s 1 -117441.93 7 +310710.63 4090.0 C57
2021-11-29 00:53:54 S 06 30 01.193 +12 51 21.31 V C57
2021-11-29 00:53:54 s 1 -117726.86 0 +310318.89 3010.0 C57
2021-11-29 01:03:54 S 06 30 00.701 +12 51 20.84 V C57
2021-11-29 01:03:54 s 1 -118011.32 8 +309925.96 9950.0 C57
2021-11-29 01:13:54 S 06 30 00.266 +12 51 20.45 V C57
2021-11-29 01:13:54 s 1 -118295.33 8 +309531.86 4880.0 C57
2021-11-29 01:23:54 S 06 29 59.786 +12 51 22.14 V C57
2021-11-29 01:23:54 s 1 -118578.88 8 +309136.57 7800.0 C57
2021-11-29 01:33:54 S 06 29 59.172 +12 51 22.32 V C57
2021-11-29 01:33:54 s 1 -118861.97 7 +308740.11 8710.0 C57
2021-11-29 01:43:54 S 06 29 58.860 +12 51 19.33 V C57
2021-11-29 01:43:54 s 1 -119144.60 2 +308342.46 7590.0 C57
2021-11-29 01:53:54 S 06 29 58.272 +12 51 21.82 V C57
2021-11-29 01:53:54 s 1 -119426.76 2 +307943.63 4430.0 C57
2021-11-29 02:03:54 S 06 29 57.852 +12 51 21.31 V C57
2021-11-29 02:03:54 s 1 -119708.45 4 +307543.62 9230.0 C57
2021-11-29 02:13:54 S 06 29 57.442 +12 51 22.18 V C57
2021-11-29 02:13:54 s 1 -119989.67 6 +307142.42 1980.0 C57
2021-11-29 02:23:54 S 06 29 56.810 +12 51 21.78 V C57
2021-11-29 02:23:54 s 1 -120270.42 5 +306740.03 2670.0 C57
2021-11-29 02:33:54 S 06 29 56.395 +12 51 21.85 V C57
2021-11-29 02:33:54 s 1 -120550.70 1 +306336.46 1300.0 C57
2021-11-29 02:43:54 S 06 29 55.853 +12 51 22.10 V C57
2021-11-29 02:43:54 s 1 -120830.50 0 +305931.70 7840.0 C57
2021-11-29 02:53:54 S 06 29 55.315 +12 51 22.28 V C57
2021-11-29 02:53:54 s 1 -121109.82 0 +305525.74 2300.0 C57
2021-11-29 03:03:54 S 06 29 54.874 +12 51 21.92 V C57
2021-11-29 03:03:54 s 1 -121388.66 0 +305118.60 4660.0 C57
2021-11-29 03:13:54 S 06 29 54.413 +12 51 21.71 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)