2101 Adonis (1936 CA)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.7641273448 ± 2.00e+00
Semi-major axis (a)1.8740253992 AU ± 3.00e+00
Inclination (i)1.31997884° ± 4.00e+00
Long. of Asc. Node (Ω)349.40567161° ± 5.00e+00
Arg. of Perihelion (ω)43.71128561° ± 6.00e+00
Mean Anomaly (M)24.47916672° ± 7.33e-06
Mean Motion (n)0.3841926633°/day ± 9.23e-01
Perihelion dist (q)0.44203135 AU ± 3.81e+00
Aphelion dist (Q)3.30601945 AU ± 6.49e+00
Orbital Period2.56544796 yr ± 6.16e+00
NGA Modelr2
A2-3.31959118e-06 AU/d²
Physical Parameters
H (abs. magnitude)18.69
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.120″
Uncertainty0
Orbit TypeApollo
MOID0.011508 AU
Observations Used167
Radar Obs Used5
Oppositions29
Arc Total1936-2025
First Observation Used1936-02-12
Last Observation Used2025-07-19
Observations (181)
Date Type RA Dec Mag Band Observatory
1977-03-20 03:13:28 A 09 45 50.86 +13 51 57.0 A 801
1977-03-22 04:00:01 A 09 44 59.74 +13 53 10.1 20.5 A 801
1984-06-23 11:40:41 A 19 01 03.53 -30 11 22.8 17.0 474
1984-06-23 12:12:50 A 19 00 59.55 -30 11 59.7 474
1984-06-26 10:45:22 A 18 51 00.09 -31 46 35.8 16.0 474
1984-06-26 11:07:42 A 18 50 55.82 -31 47 11.8 474
1984-07-04 10:45:00 A 17 16 33.30 -41 34 33.3 14.0 474
1984-07-04 10:54:00 A 17 16 21.73 -41 35 18.4 474
1995-02-23 22:16:48 C 11 39 08.72 +02 56 59.9 557
1995-02-23 22:28:36 C 11 39 06.82 +02 57 11.0 557
1995-02-23 22:31:54 C 11 39 06.32 +02 57 13.9 557
1995-02-27 18:39:15 C 11 25 22.15 +04 17 57.6 z 360
1995-02-27 18:45:00 C 11 25 21.30 +04 18 02.2 z 360
1995-02-27 18:52:30 C 11 25 20.20 +04 18 08.2 z 360
1995-03-01 22:18:12 C 11 18 16.22 +04 59 14.0 557
1995-03-01 22:31:54 C 11 18 14.25 +04 59 24.0 557
1995-03-01 23:16:40 C 11 18 08.39 +04 59 57.6 046
1995-03-01 23:20:55 C 11 18 07.72 +05 00 01.5 046
1995-03-01 23:23:29 C 11 18 07.47 +05 00 01.6 046
1995-03-02 07:23:00 c 11 17 03.81 +05 06 14.6 i 691
1995-03-02 07:53:52 c 11 16 59.61 +05 06 39.0 i 691
1995-03-02 08:39:16 c 11 16 53.50 +05 07 13.8 i 691
1995-03-06 16:14:00 C 11 04 08.56 +06 20 05.3 z 360
1995-03-06 16:19:44 C 11 04 07.90 +06 20 08.9 z 360
1995-03-06 16:26:15 C 11 04 07.12 +06 20 13.0 z 360
2002-06-03 13:24:40 C 20 47 27.45 -21 47 23.4 c 474
2002-06-03 13:28:05 C 20 47 27.94 -21 47 22.3 c 474
2002-06-03 13:32:05 C 20 47 28.56 -21 47 20.4 c 474
2002-06-03 13:39:14 C 20 47 29.61 -21 47 18.8 c 474
2002-06-05 14:19:31 C 20 55 22.32 -21 29 00.4 o 608
2002-06-05 14:35:26 C 20 55 24.99 -21 28 54.2 o 608
2002-06-06 12:27:24 C 20 59 15.99 -21 19 21.6 o 608
2002-06-06 12:42:50 C 20 59 18.65 -21 19 15.2 o 608
2002-06-21 16:48:30 C 22 59 03.74 -13 44 12.4 m 428
2002-06-21 17:37:27 C 22 59 31.83 -13 41 48.8 m 428
2007-06-06 05:52:16 C 16 42 45.71 -25 13 05.1 r 649
2007-06-06 05:59:06 C 16 42 45.03 -25 13 00.7 r 649
2007-06-06 06:05:55 C 16 42 44.11 -25 13 00.7 r 649
2007-06-21 05:49:11 C 15 57 55.41 -23 39 05.7 o 696
2007-06-21 05:50:58 C 15 57 55.20 -23 39 04.1 o 696
2007-11-20 12:05:11 C 12 31 08.36 -02 50 58.9 r G96
2007-11-20 12:11:02 C 12 31 08.76 -02 51 01.7 r G96
2007-11-20 12:16:56 C 12 31 09.22 -02 51 05.3 r G96
2007-11-20 12:22:39 C 12 31 09.62 -02 51 07.3 r G96
2008-02-26 10:30:28 C 12 57 32.90 -06 31 26.5 o 691
2008-02-26 11:26:07 C 12 57 29.08 -06 31 04.0 o 691
2008-03-10 06:41:50 C 12 35 47.72 -04 21 15.1 o 691
2008-03-10 07:07:20 C 12 35 45.81 -04 21 03.2 o 691
2013-01-13 08:26:00 C 13 42 55.98 -09 39 12.1 u 807
2013-01-13 08:31:50 C 13 42 55.62 -09 39 10.7 u 807
Radar Observations (10)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1984-07-14 18:20:00 -328238.7 0.3 Hz 2380 -1 -1
1984-07-14.763889 -32823870 30 Hz 2380 251 251
1984-07-15 18:20:00 -341813.1 0.3 Hz 2380 -1 -1
1984-07-15.763889 -34181310 30 Hz 2380 251 251
1984-07-16 17:40:00 -350648 0.3 Hz 2380 -1 -1
1984-07-16.736111 -35064800 30 Hz 2380 251 251
1984-07-17 17:30:00 -358654.3 0.3 Hz 2380 -1 -1
1984-07-17.729167 -35865430 30 Hz 2380 251 251
1984-07-18 17:20:00 -365447.2 0.3 Hz 2380 -1 -1
1984-07-18.722222 -36544720 30 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)