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
2018-11-30 07:57:29 C 23 43 28.61 -15 33 56.1 U T08
2018-11-30 08:10:20 C 23 43 29.73 -15 33 45.7 U T08
2018-12-01 07:50:19 C 23 45 36.27 -15 14 44.1 U T05
2018-12-01 08:03:02 C 23 45 37.37 -15 14 33.8 U T05
2018-12-01 08:17:52 C 23 45 38.66 -15 14 21.8 U T05
2018-12-01 08:32:12 C 23 45 39.91 -15 14 10.2 U T05
2018-12-02 07:30:31 C 23 47 42.08 -14 55 45.8 U T05
2018-12-02 07:43:26 C 23 47 43.20 -14 55 35.4 U T05
2018-12-02 07:56:21 C 23 47 44.31 -14 55 25.0 U T05
2018-12-02 08:09:04 C 23 47 45.41 -14 55 14.7 U T05
2018-12-02 17:10:48 C 23 48 33.61 -14 48 04.2 q K73
2018-12-02 17:33:24 C 23 48 35.51 -14 47 46.8 q K73
2018-12-03 06:57:09 C 23 49 46.02 -14 37 01.9 U T08
2018-12-03 07:08:36 C 23 49 47.00 -14 36 52.6 U T08
2018-12-03 07:19:59 C 23 49 47.98 -14 36 43.5 U T08
2018-12-03 07:31:21 C 23 49 48.95 -14 36 34.4 U T08
2018-12-04 07:05:28 C 23 51 52.86 -14 17 48.4 U T08
2018-12-04 07:16:55 C 23 51 53.83 -14 17 39.3 U T08
2018-12-04 07:28:19 C 23 51 54.81 -14 17 30.2 U T08
2018-12-08 02:21:52 C 23 59 46.56 -13 05 36.1 q 834
2018-12-08 03:02:19 C 23 59 50.00 -13 05 03.6 q 834
2018-12-08 09:54:49 C 00 00 25.49 -12 59 40.2 q E89
2018-12-08 10:00:06 C 00 00 25.95 -12 59 36.0 q E89
2018-12-08 10:05:17 C 00 00 26.40 -12 59 31.9 q E89
2018-12-09 03:40:12 C 00 01 56.60 -12 45 56.4 V 703
2018-12-09 03:47:55 C 00 01 57.25 -12 45 50.3 V 703
2018-12-09 03:55:37 C 00 01 57.89 -12 45 44.2 V 703
2018-12-09 04:03:20 C 00 01 58.54 -12 45 38.3 V 703
2018-12-09 19:49:47 C 00 03 19.07 -12 33 20.3 q K73
2018-12-09 19:56:54 C 00 03 19.69 -12 33 15.6 q K73
2018-12-09 20:06:44 C 00 03 20.55 -12 33 08.4 q K73
2018-12-10 07:28:18 C 00 04 18.45 -12 24 14.5 U T05
2018-12-10 07:40:27 C 00 04 19.46 -12 24 05.1 U T05
2018-12-10 07:52:07 C 00 04 20.43 -12 23 55.9 U T05
2018-12-10 08:04:32 C 00 04 21.46 -12 23 46.2 U T05
2018-12-18 09:16:05 C 00 20 30.10 -09 55 48.2 q E89
2018-12-18 09:21:28 C 00 20 30.53 -09 55 44.1 q E89
2018-12-18 09:26:39 C 00 20 30.94 -09 55 40.3 q E89
2018-12-22 07:53:46 C 00 28 14.41 -08 45 21.5 V T05
2018-12-22 08:06:53 C 00 28 15.45 -08 45 11.6 V T05
2018-12-22 08:19:54 C 00 28 16.50 -08 45 01.9 V T05
2018-12-22 08:33:20 C 00 28 17.58 -08 44 51.9 V T05
2018-12-25 09:05:02 C 00 34 10.02 -07 51 32.2 q E89
2018-12-25 09:30:23 C 00 34 12.03 -07 51 13.6 q E89
2018-12-26 06:53:55 C 00 35 55.38 -07 35 46.9 V T05
2018-12-26 07:05:15 C 00 35 56.28 -07 35 38.6 V T05
2018-12-26 07:16:47 C 00 35 57.18 -07 35 30.2 V T05
2018-12-26 07:28:19 C 00 35 58.09 -07 35 21.8 V T05
2018-12-26 16:58:53 C 00 36 44.47 -07 28 28.7 a 233
2018-12-26 17:22:04 C 00 36 46.25 -07 28 13.2 a 233
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)