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
1962-06-21 03:33:59 A 13 32 06.16 +10 44 07.0 754
1962-06-21 03:53:00 A 13 32 06.45 +10 43 57.5 754
1962-06-25 04:03:59 A 13 35 25.33 +09 35 59.5 754
1962-06-26 04:29:00 A 13 36 23.50 +09 17 42.5 754
1962-06-27 03:49:59 A 13 37 22.22 +08 59 48.9 754
1962-07-07 05:33:44 A 13 50 12.70 +05 32 36.6 689
1962-07-07 05:58:43 A 13 50 14.20 +05 32 13.6 689
1962-07-09 03:36:00 A 13 53 12.87 +04 48 47.4 754
1962-07-19 03:00:00 A 14 11 29.93 +00 39 56.7 754
1962-07-22 03:13:00 A 14 18 03.47 -00 41 07.8 754
1962-07-24 03:21:02 A 14 22 34.34 -01 37 02.1 754
1962-07-27 02:44:59 A 14 29 37.87 -03 02 03.2 754
1962-08-03 02:59:29 A 14 48 10.18 -06 32 07.3 754
1962-08-03 03:09:47 A 14 48 11.19 -06 32 19.7 754
1962-08-20 02:30:00 A 15 43 56.35 -15 35 44.6 754
1962-08-22 02:30:59 A 15 51 35.24 -16 40 00.1 754
1962-08-26 02:30:29 A 16 07 40.14 -18 46 52.0 754
1962-08-27 03:42:32 A 16 12 02.96 -19 19 40.4 675
1962-08-27 04:06:31 A 16 12 07.03 -19 20 11.3 675
1962-08-27 04:31:17 A 16 12 11.28 -19 20 42.5 675
1962-08-28 03:26:32 A 16 16 14.07 -19 50 08.6 675
1962-08-28 03:49:32 A 16 16 18.19 -19 50 37.9 675
1962-08-29 03:27:31 A 16 20 32.00 -20 20 39.3 675
1962-08-29 03:51:32 A 16 20 36.21 -20 21 08.6 675
1962-08-30 03:46:31 A 16 24 56.65 -20 51 11.5 675
1962-08-30 04:15:31 A 16 25 01.92 -20 51 44.5 675
1962-08-31 02:17:00 A 16 29 05.08 -21 19 04.2 754
1962-08-31 02:21:59 A 16 29 05.82 -21 19 11.0 754
1962-08-31 03:42:33 A 16 29 21.76 -21 20 48.3 675
1962-09-02 01:56:59 A 16 37 55.92 -22 16 15.4 754
1964-01-21 08:20:04 A 09 16 09.59 +15 11 15.2 689
1964-02-18 03:38:37 A 08 41 49.81 +18 51 16.7 689
1964-02-18 04:47:36 A 08 41 46.39 +18 51 37.1 689
1969-03-16 07:03:07 A 07 47 43.18 +21 25 17.9 693
1969-03-16 07:36:08 A 07 47 42.99 +21 25 21.0 693
1970-11-29 06:18:56 A 05 15 20.24 +09 38 44.0 693
1970-11-29 06:30:55 A 05 15 19.46 +09 38 43.8 693
1972-03-13 23:04:46 A 11 35 15.21 +13 25 03.3 095
1975-11-25 11:35:00 A 04 13 42.01 +05 14 15.6 16.0 885
1975-11-25 12:00:00 A 04 13 40.45 +05 14 14.5 885
1980-09-05 23:21:29 A 03 49 32.58 +05 32 16.5 559
1980-09-06 00:00:59 A 03 49 33.96 +05 32 04.1 559
1980-09-11 02:23:00 A 03 53 16.28 +04 49 25.9 559
1980-09-11 03:05:30 A 03 53 17.18 +04 49 10.0 559
1980-09-13 01:45:29 A 03 54 19.82 +04 31 56.8 559
1980-09-13 02:34:29 A 03 54 20.62 +04 31 38.8 559
1980-09-14 23:32:00 A 03 55 09.01 +04 14 34.3 559
1980-09-15 00:26:00 A 03 55 09.86 +04 14 12.0 559
1980-10-05 15:38:37 A 03 50 47.27 +00 50 55.3 414
1980-10-05 16:01:34 A 03 50 46.45 +00 50 45.4 414
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)