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
2013-12-05 07:27:59 C 01 29 03.934 -06 41 52.50 L F51
2013-12-05 07:44:52 C 01 29 04.248 -06 41 43.12 L F51
2013-12-06 01:54:09 C 01 29 27.26 -06 31 34.1 u X14
2013-12-06 02:05:36 C 01 29 27.45 -06 31 27.9 u X14
2013-12-06 02:14:22 C 01 29 27.62 -06 31 23.1 u X14
2013-12-07 20:00:17 C 01 30 24.52 -06 08 23.5 u Z65
2013-12-07 20:12:06 C 01 30 24.82 -06 08 17.0 u Z65
2013-12-07 20:32:57 C 01 30 25.27 -06 08 05.1 u Z65
2013-12-12 01:31:53 C 01 33 01.49 -05 11 43.0 u H21
2013-12-12 01:35:17 C 01 33 01.59 -05 11 40.9 u H21
2013-12-12 01:38:40 C 01 33 01.68 -05 11 39.1 u H21
2013-12-12 01:41:08 C 01 33 01.74 -05 11 37.6 u H21
2013-12-12 01:45:27 C 01 33 01.86 -05 11 35.3 u H21
2013-12-13 02:25:02 C 01 33 43.85 -04 57 46.5 u H21
2013-12-13 02:28:22 C 01 33 43.93 -04 57 44.6 u H21
2013-12-13 02:31:11 C 01 33 44.03 -04 57 43.1 u H21
2013-12-13 02:34:14 C 01 33 44.10 -04 57 41.4 u H21
2013-12-13 02:38:02 C 01 33 44.21 -04 57 39.1 u H21
2013-12-13 02:40:20 C 01 33 44.26 -04 57 38.0 u H21
2013-12-16 19:31:49 C 01 36 27.79 -04 07 46.9 a 233
2013-12-16 19:43:01 C 01 36 28.12 -04 07 40.7 a 233
2013-12-16 19:54:12 C 01 36 28.48 -04 07 34.2 a 233
2013-12-16 20:05:22 C 01 36 28.80 -04 07 28.1 a 233
2013-12-17 02:50:32 C 01 36 42.04 -04 03 39.5 q H45
2013-12-17 02:52:07 C 01 36 42.07 -04 03 38.6 q H45
2013-12-17 02:53:47 C 01 36 42.13 -04 03 37.7 q H45
2013-12-17 02:55:25 C 01 36 42.18 -04 03 37.0 q H45
2013-12-17 02:56:55 C 01 36 42.23 -04 03 36.1 q H45
2013-12-17 02:58:22 C 01 36 42.27 -04 03 35.3 q H45
2013-12-17 16:52:43 C 01 37 09.85 -03 55 48.2 q L22
2013-12-17 16:54:21 C 01 37 09.89 -03 55 47.1 q L22
2013-12-17 16:55:28 C 01 37 09.94 -03 55 46.4 q L22
2013-12-17 16:57:06 C 01 37 09.99 -03 55 46.0 q L22
2013-12-17 16:58:12 C 01 37 10.02 -03 55 45.1 q L22
2013-12-17 16:59:51 C 01 37 10.10 -03 55 43.7 q L22
2013-12-17 17:01:13 C 01 37 10.13 -03 55 42.6 q L22
2013-12-17 17:02:18 C 01 37 10.18 -03 55 43.0 q L22
2013-12-19 01:15:02 C 01 38 15.25 -03 37 37.4 u H21
2013-12-19 01:17:53 C 01 38 15.34 -03 37 35.8 u H21
2013-12-19 01:23:10 C 01 38 15.51 -03 37 32.9 u H21
2013-12-19 01:28:25 C 01 38 15.68 -03 37 29.9 u H21
2013-12-19 01:35:03 C 01 38 15.91 -03 37 26.2 u H21
2013-12-19 03:35:59 C 01 38 19.85 -03 36 18.5 u H21
2013-12-19 03:38:49 C 01 38 19.95 -03 36 16.8 u H21
2013-12-19 03:41:32 C 01 38 20.04 -03 36 15.2 u H21
2013-12-19 03:44:20 C 01 38 20.14 -03 36 13.6 u H21
2013-12-19 03:46:24 C 01 38 20.20 -03 36 12.6 u H21
2013-12-19 03:49:08 C 01 38 20.30 -03 36 11.1 u H21
2013-12-29 15:02:33 C 01 47 59.72 -01 15 56.3 o C41
2013-12-29 15:04:38 C 01 47 59.78 -01 15 55.7 o C41
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)