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
2023-09-06 17:45:47 B 15 48 18.059 -17 01 28.68 Z M49
2023-09-06 17:50:54 B 15 48 18.877 -17 01 33.66 Z M49
2023-09-07 17:49:03 B 15 52 08.432 -17 25 13.51 Z M49
2023-09-07 18:00:58 B 15 52 10.303 -17 25 25.73 Z M49
2023-09-07 18:12:53 B 15 52 12.209 -17 25 37.43 Z M49
2023-09-10 17:52:59 B 16 03 53.429 -18 35 06.86 Z M49
2023-09-10 17:58:06 B 16 03 54.258 -18 35 11.64 Z M49
2023-09-10 18:03:14 B 16 03 55.116 -18 35 16.53 Z M49
2023-09-11 06:02:39 C 16 05 54.473 -18 46 48.22 X F51
2023-09-11 06:10:05 C 16 05 55.704 -18 46 56.03 X F51
2023-09-11 06:17:31 C 16 05 56.926 -18 47 02.99 X F51
2023-09-11 06:24:58 C 16 05 58.220 -18 47 09.74 X F51
2023-09-13 18:50:24 C 16 16 09.506 -19 43 30.61 V M22
2023-09-13 18:54:38 C 16 16 10.219 -19 43 34.54 V M22
2023-09-13 19:05:06 C 16 16 11.988 -19 43 44.29 V M22
2023-09-13 19:20:22 C 16 16 14.570 -19 43 57.72 V M22
2023-09-14 17:45:27 B 16 20 05.554 -20 04 29.63 Z M49
2023-09-14 17:54:09 B 16 20 07.032 -20 04 37.39 Z M49
2023-09-14 18:02:21 B 16 20 08.420 -20 04 44.44 Z M49
2023-09-19 18:22:54 C 16 41 22.663 -21 49 27.16 V M22
2023-09-19 18:27:48 C 16 41 23.525 -21 49 31.08 V M22
2023-09-19 18:35:49 C 16 41 24.955 -21 49 37.78 V M22
2023-09-19 18:50:56 C 16 41 27.672 -21 49 50.05 V M22
2023-09-22 18:31:19 C 16 54 33.878 -22 47 24.11 V M22
2023-09-22 18:45:53 C 16 54 36.547 -22 47 35.23 V M22
2023-09-22 19:14:37 C 16 54 41.815 -22 47 57.12 V M22
2023-09-22 19:36:42 C 16 54 45.876 -22 48 13.90 V M22
2023-09-27 01:22:06 C 17 13 54.170 -24 02 36.49 V W68
2023-09-27 01:26:19 C 17 13 54.967 -24 02 39.12 V W68
2023-09-27 01:35:13 C 17 13 56.654 -24 02 45.20 V W68
2023-09-27 01:50:10 C 17 13 59.491 -24 02 55.18 V W68
2023-09-28 18:08:37 B 17 21 43.91 -24 29 47.7 Z M49
2023-09-28 18:24:59 B 17 21 47.03 -24 29 58.1 Z M49
2023-09-28 18:41:42 B 17 21 50.22 -24 30 08.7 Z M49
2023-10-01 17:57:28 C 17 35 42.629 -25 13 35.15 V M22
2023-10-01 18:02:04 C 17 35 43.522 -25 13 37.74 V M22
2023-10-01 18:10:17 C 17 35 45.113 -25 13 42.42 V M22
2023-10-03 00:27:06 C 17 41 42.737 -25 30 34.63 V W68
2023-10-03 00:45:15 C 17 41 46.282 -25 30 44.21 V W68
2023-10-03 00:49:55 C 17 41 47.191 -25 30 46.76 V W68
2023-10-03 00:58:12 C 17 41 48.804 -25 30 51.08 V W68
2023-10-04 18:23:39 C 17 50 01.639 -25 52 17.69 V M22
2023-10-04 18:27:39 C 17 50 02.424 -25 52 19.67 V M22
2023-10-04 18:53:44 C 17 50 07.565 -25 52 32.20 V M22
2023-10-06 00:26:16 C 17 56 01.243 -26 06 39.78 V W68
2023-10-06 00:30:53 C 17 56 02.160 -26 06 41.83 V W68
2023-10-06 00:52:47 C 17 56 06.490 -26 06 51.77 V W68
2023-10-06 01:03:28 C 17 56 08.609 -26 06 56.41 V W68
2023-10-13 18:21:44 C 18 33 35.345 -27 12 10.01 V M22
2023-10-13 18:29:44 C 18 33 36.948 -27 12 11.81 V M22
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)