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
2020-02-22 09:11:29 C 08 54 22.14 +18 56 54.2 V T08
2020-02-22 09:19:13 C 08 54 21.76 +18 56 56.6 V T08
2020-02-22 09:34:51 C 08 54 20.98 +18 57 01.3 V T08
2020-02-22 22:33:46 C 08 53 43.95 +19 00 51.6 16.7 q 122
2020-02-22 22:44:14 C 08 53 43.45 +19 00 54.5 16.8 q 122
2020-02-22 22:53:18 C 08 53 43.01 +19 00 57.3 16.8 q 122
2020-02-23 02:19:05 C 08 53 33.42 +19 01 59.1 q I15
2020-02-23 02:27:30 C 08 53 33.01 +19 02 01.6 q I15
2020-02-23 03:00:24 C 08 53 31.42 +19 02 11.4 q I15
2020-02-23 22:10:09 C 08 52 37.51 +19 07 49.7 16.7 q 122
2020-02-23 22:23:13 C 08 52 36.89 +19 07 53.5 16.8 q 122
2020-02-23 22:37:43 C 08 52 36.20 +19 07 57.7 16.8 q 122
2020-02-24 06:10:40 C 08 52 15.48 +19 10 11.2 V T05
2020-02-24 06:24:58 C 08 52 14.80 +19 10 15.3 V T05
2020-02-24 06:35:59 C 08 52 14.28 +19 10 18.5 V T05
2020-02-24 06:51:05 C 08 52 13.56 +19 10 22.9 V T05
2020-02-24 12:11:18 C 08 51 58.39 +19 12 01.2 q E89
2020-02-24 12:16:32 C 08 51 58.17 +19 12 02.7 q E89
2020-02-24 12:21:42 C 08 51 57.95 +19 12 04.1 q E89
2020-02-24 12:34:05 C 08 51 57.35 +19 12 07.6 q E89
2020-02-24 12:40:45 C 08 51 57.03 +19 12 09.4 q E89
2020-02-25 04:07:41 C 08 51 15.06 +19 16 28.5 V G96
2020-02-25 04:15:44 C 08 51 14.68 +19 16 30.8 V G96
2020-02-25 04:23:47 C 08 51 14.31 +19 16 33.2 V G96
2020-02-25 04:31:49 C 08 51 13.93 +19 16 35.5 V G96
2020-02-26 06:00:36 C 08 50 05.20 +19 23 45.1 V 703
2020-02-26 06:08:17 C 08 50 04.85 +19 23 47.2 V 703
2020-02-26 06:15:58 C 08 50 04.49 +19 23 49.5 V 703
2020-02-26 06:23:38 C 08 50 04.15 +19 23 51.5 V 703
2020-02-26 09:19:57 C 08 49 56.34 +19 24 41.4 V T08
2020-02-26 09:24:41 C 08 49 56.13 +19 24 42.8 V T08
2020-02-26 09:26:41 C 08 49 56.03 +19 24 43.5 V T08
2020-02-26 09:31:31 C 08 49 55.81 +19 24 44.7 V T08
2020-02-26 09:34:16 C 08 49 55.69 +19 24 45.3 V T08
2020-02-26 09:52:25 C 08 49 54.85 +19 24 50.5 V T08
2020-02-26 09:53:53 C 08 49 54.78 +19 24 50.9 V T08
2020-02-26 10:00:14 C 08 49 54.49 +19 24 52.7 V T08
2020-02-26 12:12:43 C 08 49 48.96 +19 25 27.9 q D29
2020-02-26 12:33:06 C 08 49 48.04 +19 25 33.6 q D29
2020-02-26 12:53:28 C 08 49 47.10 +19 25 39.3 q D29
2020-03-05 02:39:31 C 08 42 31.34 +20 11 14.7 u H21
2020-03-05 02:41:28 C 08 42 31.27 +20 11 14.8 u H21
2020-03-05 02:43:26 C 08 42 31.18 +20 11 15.3 u H21
2020-03-05 02:45:23 C 08 42 31.11 +20 11 16.0 u H21
2020-03-05 02:47:21 C 08 42 31.04 +20 11 16.3 u H21
2020-03-05 02:49:19 C 08 42 30.98 +20 11 17.0 u H21
2020-03-05 02:53:14 C 08 42 30.82 +20 11 17.6 u H21
2020-03-05 02:55:11 C 08 42 30.76 +20 11 18.3 u H21
2020-03-05 02:57:09 C 08 42 30.68 +20 11 18.5 u H21
2020-03-05 02:59:06 C 08 42 30.61 +20 11 19.0 u H21
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)