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
1929-09-25 23:02:24 X 00 41.4 -22 38 078
1929-09-25 23:14:03 A 00 41 22.95 -22 38 42.9 078
1929-10-01 22:51:14 A 00 38 04.64 -22 31 18.2 078
1929-10-02 22:59:16 A 00 37 33.86 -22 27 51.6 078
1929-10-08 22:30:12 A 00 34 54.54 -21 55 35.3 078
1952-11-10 15:01:50 A 02 50 40.37 -03 36 07.8 13.0 388
1952-11-18 14:23:59 A 02 41 01.78 -03 15 57.5 13.0 388
1957-05-26 00:43:12 A 18 46.8 +08 10 031
1957-05-29 00:43:12 A 18 55.0 +08 58 031
1957-05-30 00:43:12 A 18 57.8 +09 14 031
1957-06-06 23:31:12 A 19 21.8 +11 08 031
1957-06-26 00:00:00 A 20 36.2 +12 58 031
1957-06-28 23:31:12 A 20 50.3 +12 38 031
1957-06-29 23:31:12 A 20 55.2 +12 27 031
1957-07-04 00:00:00 A 21 15.3 +11 37 031
1957-07-05 00:00:00 A 21 20.4 +11 20 031
1957-07-06 00:00:00 A 21 25.4 +11 00 031
1957-07-16 21:32:30 A 22 23 02.35 +06 02 13.4 031
1957-07-16 21:49:30 A 22 23 05.91 +06 01 49.9 031
1957-07-25 01:28:44 A 23 03 07.21 +00 47 10.7 042
1957-07-26 01:27:17 A 23 07 38.03 +00 05 39.0 042
1957-07-28 01:29:39 A 23 16 21.86 -01 18 18.8 020
1957-07-28 01:46:18 A 23 16 24.46 -01 18 57.3 042
1957-07-30 06:11:53 A 23 25 26.40 -02 51 09.5 754
1957-07-31 08:24:44 A 23 29 42.54 -03 37 17.1 10.0 754
1957-07-31 22:15:29 A 23 31 57.25 -04 01 40.4 031
1957-08-01 00:01:29 A 23 32 13.01 -04 04 47.8 031
1957-08-01 00:23:30 A 23 32 16.32 -04 05 26.2 031
1957-08-01 00:32:54 A 23 32 17.69 -04 05 41.3 042
1957-08-02 02:43:05 A 23 36 23.01 -04 50 09.7 822
1957-08-02 03:01:03 A 23 36 25.62 -04 50 42.5 822
1957-08-02 06:09:57 A 23 36 53.18 -04 57 15.2 12.0 760
1957-08-02 07:15:52 A 23 37 02.56 -04 59 10.3 760
1957-08-02 08:26:51 A 23 37 12.35 -05 01 11.9 760
1957-08-03 02:35:41 A 23 39 57.19 -05 31 34.1 822
1957-08-03 02:49:39 A 23 39 59.31 -05 31 59.1 822
1957-08-03 06:26:54 A 23 40 29.84 -05 39 19.6 760
1957-08-03 07:28:56 A 23 40 38.18 -05 41 07.1 760
1957-08-03 08:39:57 A 23 40 47.79 -05 43 07.4 760
1957-08-04 03:14:08 A 23 43 30.59 -06 13 58.3 822
1957-08-04 03:24:07 A 23 43 31.91 -06 14 15.2 822
1957-08-05 00:40:29 A 23 46 28.17 -06 51 41.1 031
1957-08-05 01:00:29 A 23 46 30.68 -06 52 15.1 031
1957-08-05 06:40:57 A 23 47 17.78 -07 01 42.7 760
1957-08-05 07:13:56 A 23 47 21.94 -07 02 38.1 760
1957-08-05 07:47:55 A 23 47 26.10 -07 03 35.7 760
1957-08-05 09:41:08 A 23 47 40.88 -07 06 40.3 711
1957-08-05 09:48:08 A 23 47 41.76 -07 06 52.1 711
1957-08-06 00:15:59 A 23 49 38.68 -07 31 23.7 031
1957-08-06 00:37:29 A 23 49 41.17 -07 31 58.8 031
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)