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
2017-12-09 12:54:40 C 12 48 11.70 -00 30 56.8 U 703
2017-12-09 12:58:27 C 12 48 11.96 -00 30 58.1 U 703
2017-12-15 12:11:34 C 12 58 00.86 -01 12 56.3 U 703
2017-12-15 12:18:31 C 12 58 01.35 -01 12 58.3 U 703
2017-12-15 12:25:29 C 12 58 01.82 -01 13 00.4 U 703
2017-12-15 12:32:26 C 12 58 02.28 -01 13 02.2 U 703
2017-12-16 05:29:43 C 12 59 11.94 -01 17 49.9 c J04
2017-12-16 05:46:33 C 12 59 13.08 -01 17 54.7 c J04
2017-12-16 06:03:23 C 12 59 14.14 -01 17 58.9 c J04
2017-12-16 06:20:13 C 12 59 15.35 -01 18 04.2 c J04
2017-12-16 12:41:16 C 12 59 41.36 -01 19 52.4 U 703
2017-12-16 12:48:29 C 12 59 41.85 -01 19 54.2 U 703
2017-12-16 12:55:42 C 12 59 42.35 -01 19 56.3 U 703
2017-12-16 13:02:55 C 12 59 42.82 -01 19 58.7 U 703
2017-12-17 05:09:08 C 13 00 48.81 -01 24 26.8 q 160
2017-12-17 05:12:04 C 13 00 49.05 -01 24 29.7 q 160
2017-12-17 05:14:57 C 13 00 49.17 -01 24 30.8 q 160
2017-12-19 04:51:03 C 13 04 04.30 -01 37 40.4 q 160
2017-12-19 04:54:02 C 13 04 04.51 -01 37 41.6 q 160
2017-12-19 04:56:56 C 13 04 04.69 -01 37 42.1 q 160
2017-12-21 03:59:45 C 13 07 17.16 -01 50 23.6 U 160
2017-12-21 04:02:40 C 13 07 17.36 -01 50 24.5 U 160
2017-12-21 04:05:36 C 13 07 17.63 -01 50 24.7 U 160
2017-12-22 12:45:16 C 13 09 31.01 -01 59 01.8 U 703
2017-12-22 12:51:11 C 13 09 31.40 -01 59 03.2 U 703
2017-12-22 12:57:05 C 13 09 31.81 -01 59 05.0 U 703
2017-12-22 13:03:01 C 13 09 32.19 -01 59 06.5 U 703
2017-12-24 04:08:52 C 13 12 11.69 -02 09 14.4 17.3 q 160
2017-12-24 04:10:47 C 13 12 11.84 -02 09 14.4 16.8 q 160
2017-12-24 04:13:43 C 13 12 12.07 -02 09 15.2 16.1 q 160
2017-12-26 11:26:26 C 13 15 56.93 -02 23 08.2 U 703
2017-12-26 11:34:09 C 13 15 57.43 -02 23 09.6 U 703
2017-12-26 11:41:53 C 13 15 57.93 -02 23 12.1 U 703
2017-12-26 11:49:36 C 13 15 58.46 -02 23 14.4 U 703
2017-12-29 11:27:17 C 13 20 49.29 -02 40 32.5 U 703
2017-12-29 11:35:04 C 13 20 49.82 -02 40 34.5 U 703
2017-12-29 11:42:50 C 13 20 50.33 -02 40 36.4 U 703
2017-12-29 11:50:38 C 13 20 50.85 -02 40 38.2 U 703
2017-12-31 14:58:19 C 13 24 17.86 -02 52 27.3 U T05
2017-12-31 15:10:01 C 13 24 18.64 -02 52 29.9 U T05
2017-12-31 15:21:48 C 13 24 19.42 -02 52 32.6 U T05
2017-12-31 15:33:28 C 13 24 20.20 -02 52 35.3 U T05
2018-01-02 14:35:45 C 13 27 30.23 -03 03 04.0 U T08
2018-01-02 14:47:06 C 13 27 30.98 -03 03 06.6 U T08
2018-01-02 14:57:10 C 13 27 31.62 -03 03 08.8 U T08
2018-01-02 14:58:30 C 13 27 31.72 -03 03 09.0 U T08
2018-01-02 15:08:28 C 13 27 32.38 -03 03 11.5 U T08
2018-01-02 15:09:48 C 13 27 32.46 -03 03 11.7 U T08
2018-01-02 15:19:59 C 13 27 33.14 -03 03 14.0 U T08
2018-01-02 15:32:19 C 13 27 33.96 -03 03 16.5 U T08
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)