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
2016-11-08 04:49:03 C 07 20 22.53 +13 49 21.7 c A24
2016-11-08 04:50:08 C 07 20 22.53 +13 49 21.6 c A24
2016-11-09 03:20:32 C 07 20 16.16 +13 48 17.0 c A24
2016-11-09 03:21:36 C 07 20 16.17 +13 48 17.0 c A24
2016-11-09 04:21:00 C 07 20 15.77 +13 48 14.3 c A24
2016-11-09 04:22:02 C 07 20 15.77 +13 48 14.1 c A24
2016-11-15 03:35:51 C 07 18 51.17 +13 43 22.8 q 160
2016-11-15 03:37:51 C 07 18 51.14 +13 43 23.2 q 160
2016-11-15 03:39:53 C 07 18 51.14 +13 43 23.3 q 160
2016-11-16 03:18:47 C 07 18 29.93 +13 42 55.8 q 160
2016-11-16 03:20:38 C 07 18 29.90 +13 42 55.8 q 160
2016-11-16 03:22:30 C 07 18 29.88 +13 42 55.8 q 160
2016-11-20 14:32:18 C 07 16 27.62 +13 42 13.2 L T05
2016-11-20 14:53:57 C 07 16 27.08 +13 42 13.2 L T05
2016-11-20 15:12:24 C 07 16 26.66 +13 42 13.1 L T05
2016-11-20 15:36:52 C 07 16 26.07 +13 42 13.3 L T05
2016-11-24 14:02:47 C 07 14 02.66 +13 43 26.1 L T05
2016-11-24 14:36:59 C 07 14 01.65 +13 43 26.9 L T05
2016-11-24 15:00:48 C 07 14 00.95 +13 43 27.7 L T05
2016-11-24 15:24:46 C 07 14 00.18 +13 43 27.6 L T05
2016-11-30 01:46:13 C 07 09 48.17 +13 48 05.2 c A24
2016-11-30 01:47:15 C 07 09 48.13 +13 48 05.2 c A24
2016-11-30 02:48:56 C 07 09 45.82 +13 48 08.4 c A24
2016-11-30 02:49:59 C 07 09 45.79 +13 48 08.5 c A24
2016-11-30 09:54:00 C 07 09 30.43 +13 48 30.9 R G45
2016-11-30 09:55:02 C 07 09 30.39 +13 48 31.0 R G45
2016-11-30 10:00:43 C 07 09 30.18 +13 48 31.3 R G45
2016-11-30 10:03:03 C 07 09 30.08 +13 48 31.2 R G45
2016-11-30 10:09:36 C 07 09 29.82 +13 48 31.5 R G45
2016-11-30 10:16:59 C 07 09 29.55 +13 48 32.0 R G45
2016-11-30 10:24:25 C 07 09 29.26 +13 48 32.2 R G45
2016-12-01 01:12:21 C 07 08 56.51 +13 49 17.7 c A24
2016-12-01 01:13:23 C 07 08 56.48 +13 49 17.8 c A24
2016-12-01 02:17:14 C 07 08 53.99 +13 49 21.3 c A24
2016-12-01 02:18:17 C 07 08 53.96 +13 49 21.3 c A24
2016-12-01 03:22:31 C 07 08 51.47 +13 49 25.0 q 160
2016-12-01 03:24:38 C 07 08 51.38 +13 49 25.1 q 160
2016-12-01 03:26:42 C 07 08 51.30 +13 49 25.1 q 160
2016-12-02 01:27:36 C 07 08 01.03 +13 50 39.5 c A24
2016-12-02 01:28:42 C 07 08 00.99 +13 50 39.7 c A24
2016-12-02 02:34:39 C 07 07 58.35 +13 50 43.7 c A24
2016-12-02 02:35:44 C 07 07 58.32 +13 50 43.7 c A24
2016-12-06 02:35:38 C 07 03 59.71 +13 57 18.3 q 160
2016-12-06 02:39:33 C 07 03 59.50 +13 57 19.3 q 160
2016-12-06 02:43:23 C 07 03 59.35 +13 57 19.1 q 160
2016-12-06 07:47:39 C 07 03 46.17 +13 57 44.3 R G45
2016-12-06 07:48:02 C 07 03 46.17 +13 57 44.4 R G45
2016-12-06 07:53:57 C 07 03 45.89 +13 57 45.1 R G45
2016-12-06 07:55:17 C 07 03 45.85 +13 57 44.9 R G45
2016-12-06 08:02:07 C 07 03 45.54 +13 57 45.4 R G45
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)