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
2012-02-16 19:30:04 C 06 25 19.64 +19 17 08.4 c A24
2012-02-16 19:31:05 C 06 25 19.64 +19 17 08.4 c A24
2012-02-16 20:39:16 C 06 25 18.55 +19 17 19.3 c A24
2012-02-16 20:40:18 C 06 25 18.54 +19 17 19.5 c A24
2012-02-16 23:13:09 C 06 25 16.05 +19 17 43.4 d B66
2012-02-16 23:57:01 C 06 25 15.37 +19 17 50.3 d B66
2012-02-17 19:33:16 C 06 24 58.34 +19 20 56.9 c A24
2012-02-17 19:34:19 C 06 24 58.32 +19 20 57.0 c A24
2012-02-17 20:42:25 C 06 24 57.30 +19 21 07.6 c A24
2012-02-17 20:43:27 C 06 24 57.29 +19 21 07.7 c A24
2012-02-21 16:29:30 C 06 23 54.80 +19 35 13.1 r 168
2012-02-21 17:30:30 C 06 23 54.23 +19 35 22.0 r 168
2012-02-21 17:37:50 C 06 23 54.16 +19 35 23.3 r 168
2012-02-21 18:58:14 C 06 23 53.56 +19 35 36.1 c A24
2012-02-21 18:59:16 C 06 23 53.54 +19 35 36.3 c A24
2012-02-21 20:07:33 C 06 23 52.89 +19 35 46.5 c A24
2012-02-21 20:08:35 C 06 23 52.89 +19 35 46.6 c A24
2012-02-22 18:45:28 C 06 23 42.32 +19 39 08.0 c A24
2012-02-22 18:46:30 C 06 23 42.31 +19 39 08.5 c A24
2012-02-22 23:56:42 C 06 23 39.86 +19 39 54.0 d B66
2012-02-23 00:22:01 C 06 23 39.73 +19 39 57.4 d B66
2012-02-23 05:03:47 C 06 23 38.01 +19 40 40.4 c 704
2012-02-23 05:21:01 C 06 23 37.84 +19 40 43.3 c 704
2012-02-23 05:38:08 C 06 23 37.69 +19 40 46.5 c 704
2012-02-23 05:55:19 C 06 23 37.58 +19 40 49.5 c 704
2012-02-23 06:12:27 C 06 23 37.36 +19 40 51.7 c 704
2012-02-24 19:05:51 C 06 23 25.37 +19 46 11.3 c A24
2012-02-24 19:06:54 C 06 23 25.39 +19 46 11.5 c A24
2012-02-24 20:15:09 C 06 23 25.04 +19 46 20.9 c A24
2012-02-24 20:16:11 C 06 23 25.04 +19 46 21.2 c A24
2012-02-24 20:35:19 C 06 23 24.92 +19 46 24.1 d B66
2012-02-24 21:21:23 C 06 23 24.65 +19 46 30.8 d B66
2012-02-25 19:02:53 C 06 23 19.93 +19 49 36.3 c A24
2012-02-25 20:09:16 C 06 23 19.67 +19 49 45.6 c A24
2012-02-25 20:10:19 C 06 23 19.67 +19 49 46.0 c A24
2012-02-26 16:53:10 C 06 23 16.58 +19 52 40.2 r 168
2012-02-26 16:58:40 C 06 23 16.55 +19 52 40.9 r 168
2012-02-26 17:45:00 C 06 23 16.44 +19 52 47.4 r 168
2012-02-29 19:54:59 C 06 23 17.18 +20 02 57.5 w J97
2012-02-29 20:07:08 C 06 23 17.19 +20 02 58.4 o J94
2012-02-29 20:09:34 C 06 23 17.18 +20 02 59.3 w J97
2012-02-29 20:25:56 C 06 23 17.21 +20 03 00.4 o J94
2012-02-29 20:26:37 C 06 23 17.19 +20 03 01.5 w J97
2012-02-29 20:44:13 C 06 23 17.21 +20 03 03.2 o J94
2012-03-13 20:45:38 C 06 26 24.87 +20 40 36.8 c A24
2012-03-13 20:46:40 C 06 26 24.87 +20 40 36.7 c A24
2012-03-13 21:52:52 C 06 26 26.01 +20 40 43.7 c A24
2012-03-13 21:53:53 C 06 26 26.02 +20 40 43.9 c A24
2012-03-14 20:21:27 C 06 26 50.24 +20 43 06.4 c A24
2012-03-14 20:22:30 C 06 26 50.28 +20 43 06.8 c A24
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)