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
2018-11-11 08:31:31 C 22 59 41.99 -21 49 33.3 U T05
2018-11-11 08:45:00 C 22 59 43.36 -21 49 22.0 U T05
2018-11-12 03:49:02 C 23 01 42.82 -21 33 26.9 V 703
2018-11-12 03:56:43 C 23 01 43.62 -21 33 20.6 V 703
2018-11-12 04:04:23 C 23 01 44.35 -21 33 14.3 V 703
2018-11-12 04:12:03 C 23 01 45.16 -21 33 07.7 V 703
2018-11-13 07:17:59 C 23 04 32.70 -21 10 26.3 U T08
2018-11-13 07:31:57 C 23 04 34.09 -21 10 14.4 U T08
2018-11-13 07:45:16 C 23 04 35.42 -21 10 03.3 U T08
2018-11-13 07:58:35 C 23 04 36.75 -21 09 51.9 U T08
2018-11-16 10:56:21 C 23 12 10.66 -20 07 07.1 q E89
2018-11-16 11:00:31 C 23 12 11.08 -20 07 03.8 q E89
2018-11-16 11:03:52 C 23 12 11.41 -20 07 00.9 q E89
2018-11-17 14:24:43 S 23 14 54.098 -19 44 19.68 L C51
2018-11-17 14:24:54 S 23 14 54.115 -19 44 19.79 L C51
2018-11-20 01:46:18 C 23 20 40.57 -18 55 00.3 q 834
2018-11-20 03:08:48 C 23 20 48.39 -18 53 51.5 q 834
2018-11-21 07:39:18 C 23 23 32.44 -18 30 26.9 U T08
2018-11-21 07:52:00 C 23 23 33.62 -18 30 16.3 U T08
2018-11-21 08:05:21 C 23 23 34.87 -18 30 05.3 U T08
2018-11-21 08:18:00 C 23 23 36.05 -18 29 54.7 U T08
2018-11-22 09:48:37 C 23 26 01.48 -18 08 43.1 q E89
2018-11-22 09:56:15 C 23 26 02.17 -18 08 36.8 q E89
2018-11-22 10:07:20 C 23 26 03.20 -18 08 27.6 q E89
2018-11-26 07:28:57 C 23 34 44.66 -16 52 07.1 U T08
2018-11-26 07:43:10 C 23 34 45.94 -16 51 55.2 U T08
2018-11-26 07:57:27 C 23 34 47.22 -16 51 43.6 U T08
2018-11-26 08:11:42 C 23 34 48.50 -16 51 31.9 U T08
2018-11-27 07:24:04 C 23 36 55.92 -16 32 38.9 U T05
2018-11-27 07:37:31 C 23 36 57.12 -16 32 28.0 U T05
2018-11-27 07:50:56 C 23 36 58.31 -16 32 17.0 U T05
2018-11-27 08:04:59 C 23 36 59.56 -16 32 05.5 U T05
2018-11-28 04:00:53 C 23 38 48.35 -16 15 56.4 V 703
2018-11-28 04:08:37 C 23 38 49.05 -16 15 50.1 V 703
2018-11-28 04:16:22 C 23 38 49.73 -16 15 43.9 V 703
2018-11-28 04:24:07 C 23 38 50.42 -16 15 37.5 V 703
2018-11-28 07:24:51 C 23 39 06.76 -16 13 09.5 U T05
2018-11-28 07:39:00 C 23 39 08.02 -16 12 58.1 U T05
2018-11-28 07:41:07 C 23 39 08.20 -16 12 56.3 U T05
2018-11-28 07:53:17 C 23 39 09.28 -16 12 46.4 U T05
2018-11-28 07:55:22 C 23 39 09.46 -16 12 44.7 U T05
2018-11-28 08:07:33 C 23 39 10.54 -16 12 34.7 U T05
2018-11-28 08:09:37 C 23 39 10.72 -16 12 33.1 U T05
2018-11-28 08:23:55 C 23 39 11.99 -16 12 21.5 U T05
2018-11-29 07:36:53 C 23 41 17.73 -15 53 34.4 U T08
2018-11-29 07:50:19 C 23 41 18.91 -15 53 23.5 U T08
2018-11-29 08:03:49 C 23 41 20.10 -15 53 12.5 U T08
2018-11-29 08:17:56 C 23 41 21.34 -15 53 01.0 U T08
2018-11-30 07:31:44 C 23 43 26.35 -15 34 16.9 U T08
2018-11-30 07:44:40 C 23 43 27.49 -15 34 06.5 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)