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
2021-10-01 18:43:58 s 1 +174073.70 7 +190268.57 5450.0 C57
2021-10-01 18:53:58 S 06 35 53.470 +14 34 48.76 V C57
2021-10-01 18:53:58 s 1 +173951.71 5 +190947.12 7550.0 C57
2021-10-01 19:03:58 S 06 35 53.690 +14 34 45.30 V C57
2021-10-01 19:03:58 s 1 +173828.37 7 +191624.19 5280.0 C57
2021-10-01 19:13:58 S 06 35 54.218 +14 34 46.81 V C57
2021-10-01 19:13:58 s 1 +173703.70 1 +192299.76 8680.0 C57
2021-10-01 20:13:58 S 06 35 56.266 +14 34 37.96 V C57
2021-10-01 20:13:58 s 1 +172927.92 0 +196321.99 9320.0 C57
2021-10-01 20:23:58 S 06 35 56.570 +14 34 37.85 V C57
2021-10-01 20:23:58 s 1 +172794.06 7 +196987.17 3010.0 C57
2021-10-01 20:33:58 S 06 35 57.012 +14 34 34.57 V C57
2021-10-01 20:33:58 s 1 +172658.93 0 +197650.87 2550.0 C57
2021-10-01 20:43:58 S 06 35 57.379 +14 34 35.15 V C57
2021-10-01 20:43:58 s 1 +172522.51 5 +198313.09 7950.0 C57
2021-10-01 20:53:58 S 06 35 57.708 +14 34 32.48 V C57
2021-10-01 20:53:58 s 1 +172384.83 0 +198973.84 9240.0 C57
2021-10-01 21:03:58 S 06 35 58.159 +14 34 32.02 V C57
2021-10-01 21:03:58 s 1 +172245.88 1 +199633.11 6440.0 C57
2021-10-01 21:13:58 S 06 35 58.445 +14 34 32.74 V C57
2021-10-01 21:13:58 s 1 +172105.67 5 +200290.91 9580.0 C57
2021-10-01 21:23:58 S 06 35 58.894 +14 34 29.46 V C57
2021-10-01 21:23:58 s 1 +171964.21 8 +200947.24 8660.0 C57
2021-10-01 21:33:58 S 06 35 59.184 +14 34 30.47 V C57
2021-10-01 21:33:58 s 1 +171821.51 6 +201602.10 3720.0 C57
2021-10-01 21:53:58 S 06 35 59.842 +14 34 27.88 V C57
2021-10-01 21:53:58 s 1 +171532.40 3 +202907.41 1840.0 C57
2021-10-01 22:33:58 S 06 36 01.344 +14 34 22.55 V C57
2021-10-01 22:33:58 s 1 +170939.52 3 +205500.47 680.0 C57
2021-10-01 22:53:58 S 06 36 02.117 +14 34 21.83 V C57
2021-10-01 22:53:58 s 1 +170635.85 4 +206788.23 1720.0 C57
2021-10-01 23:03:58 S 06 36 02.381 +14 34 19.34 V C57
2021-10-01 23:03:58 s 1 +170482.23 3 +207429.92 1470.0 C57
2021-10-01 23:13:58 S 06 36 02.645 +14 34 19.92 V C57
2021-10-01 23:13:58 s 1 +170327.43 1 +208070.17 7390.0 C57
2021-10-01 23:23:58 S 06 36 03.206 +14 34 17.98 V C57
2021-10-01 23:23:58 s 1 +170171.45 1 +208708.95 9510.0 C57
2021-10-01 23:33:58 S 06 36 03.418 +14 34 17.44 V C57
2021-10-01 23:33:58 s 1 +170014.30 2 +209346.29 7850.0 C57
2021-10-01 23:43:58 S 06 36 03.703 +14 34 14.23 V C57
2021-10-01 23:43:58 s 1 +169855.98 7 +209982.17 2420.0 C57
2021-10-01 23:53:58 S 06 36 03.984 +14 34 14.70 V C57
2021-10-01 23:53:58 s 1 +169696.51 4 +210616.61 3240.0 C57
2021-10-02 00:03:58 S 06 36 04.486 +14 34 13.91 V C57
2021-10-02 00:03:58 s 1 +169535.88 8 +211249.59 350.0 C57
2021-10-02 01:43:58 S 06 36 08.045 +14 34 01.70 V C57
2021-10-02 01:43:58 s 1 +167867.47 7 +217500.19 540.0 C57
2021-10-02 01:53:58 S 06 36 08.438 +14 34 00.05 V C57
2021-10-02 01:53:58 s 1 +167694.54 4 +218117.35 7880.0 C57
2021-10-02 02:03:58 S 06 36 08.758 +14 33 59.18 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)