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
2012-01-23 05:30:32 C 06 44 19.79 +17 30 23.0 c 704
2012-01-23 05:48:52 C 06 44 18.90 +17 30 26.8 c 704
2012-01-23 06:07:11 C 06 44 18.01 +17 30 30.2 c 704
2012-01-23 06:25:49 C 06 44 17.10 +17 30 33.9 c 704
2012-01-23 19:43:44 C 06 43 39.78 +17 33 11.3 o C77
2012-01-23 19:50:45 C 06 43 39.44 +17 33 12.2 o C77
2012-01-23 19:57:48 C 06 43 39.09 +17 33 14.6 o C77
2012-01-23 20:04:50 C 06 43 38.76 +17 33 16.0 o C77
2012-01-23 20:11:51 C 06 43 38.42 +17 33 17.2 o C77
2012-01-23 20:31:38 C 06 43 37.47 +17 33 21.1 o C77
2012-01-23 20:38:43 C 06 43 37.13 +17 33 22.3 o C77
2012-01-23 20:40:44 C 06 43 37.20 +17 33 23.7 u J14
2012-01-23 20:45:46 C 06 43 36.80 +17 33 23.9 o C77
2012-01-23 20:47:27 C 06 43 36.73 +17 33 24.1 c A24
2012-01-23 20:48:29 C 06 43 36.68 +17 33 24.2 c A24
2012-01-23 20:52:48 C 06 43 36.48 +17 33 25.4 o C77
2012-01-23 20:59:49 C 06 43 36.14 +17 33 26.9 o C77
2012-01-23 21:19:01 C 06 43 35.22 +17 33 30.4 c A24
2012-01-23 21:20:03 C 06 43 35.16 +17 33 30.6 c A24
2012-01-23 21:48:12 C 06 43 33.95 +17 33 37.5 u J14
2012-01-25 20:49:43 C 06 41 25.07 +17 42 53.7 c A24
2012-01-25 20:50:46 C 06 41 25.02 +17 42 53.9 c A24
2012-01-25 21:57:52 C 06 41 21.96 +17 43 07.0 c A24
2012-01-25 21:58:54 C 06 41 21.91 +17 43 07.2 c A24
2012-01-26 20:31:05 C 06 40 22.63 +17 47 32.8 r J14
2012-01-26 20:35:58 C 06 40 22.27 +17 47 32.8 c A24
2012-01-26 20:37:01 C 06 40 22.22 +17 47 33.0 c A24
2012-01-26 21:34:32 C 06 40 19.66 +17 47 44.3 c A24
2012-01-26 21:35:34 C 06 40 19.61 +17 47 44.5 c A24
2012-01-26 21:47:35 C 06 40 19.19 +17 47 47.9 r J14
2012-01-30 03:25:47 C 06 37 05.78 +18 02 45.2 c 704
2012-01-30 03:43:47 C 06 37 05.06 +18 02 48.6 c 704
2012-01-30 04:01:49 C 06 37 04.33 +18 02 52.3 c 704
2012-01-30 04:19:51 C 06 37 03.59 +18 02 55.7 c 704
2012-01-30 04:38:42 C 06 37 02.83 +18 02 59.4 c 704
2012-02-07 00:40:52 C 06 30 34.68 +18 37 35.1 u I17
2012-02-07 01:19:25 C 06 30 33.51 +18 37 40.5 u I17
2012-02-07 01:53:19 C 06 30 32.50 +18 37 47.5 u I17
2012-02-07 21:31:35 C 06 29 58.86 +18 41 16.3 r J97
2012-02-07 21:35:58 C 06 29 58.69 +18 41 16.3 r J97
2012-02-07 21:41:42 C 06 29 58.51 +18 41 18.0 r J97
2012-02-14 19:49:16 C 06 26 08.01 +19 09 26.8 c A24
2012-02-14 19:50:18 C 06 26 07.99 +19 09 27.2 c A24
2012-02-14 21:00:44 C 06 26 06.62 +19 09 38.5 c A24
2012-02-14 21:01:47 C 06 26 06.59 +19 09 38.7 c A24
2012-02-15 19:21:04 C 06 25 43.19 +19 13 15.8 c A24
2012-02-15 19:22:06 C 06 25 43.19 +19 13 15.9 c A24
2012-02-15 20:30:13 C 06 25 41.93 +19 13 26.1 c A24
2012-02-15 21:52:31 C 06 25 40.48 +19 13 40.4 d B66
2012-02-15 22:30:50 C 06 25 39.80 +19 13 47.6 d B66
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)