21P

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2026-03-24 (JD 2461123.5)
Eccentricity (e)0.7111070000
Semi-major axis (a)3.4907387856 AU
Inclination (i)32.05900000°
Long. of Asc. Node (Ω)195.29460000°
Arg. of Perihelion (ω)172.93950000°
Mean Anomaly (M)0.00000000°
Mean Motion (n)—°/day
Perihelion dist (q)1.00845000 AU
Aphelion dist (Q)5.97302757 AU
Orbital Period6.52192841 yr
Physical Parameters
H (abs. magnitude)9.00
G (slope)6.00
Orbit Solution
SourceMPC
Solution Date
RMS Residual—″
Uncertainty
Orbit TypeP
MOID0.010867 AU
Observations Used
Oppositions
Arc Total
First Observation Used
Last Observation Used
Observations (7431)
Date Type RA Dec Mag Band Observatory
1999-01-20 18:02:52 C 01 36 55.67 -21 30 37.0 017
1999-01-20 18:07:17 C 01 36 56.46 -21 30 34.9 017
1999-01-21 09:54:14 C 01 39 31.88 -21 22 56.4 360
1999-01-21 09:58:00 C 01 39 32.48 -21 22 54.6 360
1999-01-22 10:50:19 C 01 43 35.15 -21 10 28.7 428
1999-01-22 10:51:50 C 01 43 35.38 -21 10 28.0 428
1999-01-22 10:53:22 C 01 43 35.63 -21 10 27.2 428
1999-01-31 10:13:32 C 02 16 45.15 -19 14 22.0 351
1999-01-31 10:18:40 C 02 16 45.83 -19 14 19.1 351
1999-01-31 10:24:01 C 02 16 46.64 -19 14 16.0 351
1999-02-06 11:04:11 C 02 37 19.73 -17 49 40.0 897
1999-02-06 11:19:38 C 02 37 21.85 -17 49 30.8 897
1999-02-07 10:11:00 C 02 40 30.00 -17 35 53.4 360
1999-02-07 10:15:44 C 02 40 30.64 -17 35 50.4 360
1999-02-07 10:52:30 C 02 40 35.62 -17 35 28.1 900
1999-02-07 11:06:00 C 02 40 37.40 -17 35 20.2 900
1999-02-08 18:27:29 C 02 44 52.66 -17 16 32.7 160
1999-02-14 17:58:56 C 03 03 41.54 -15 49 57.2 017
1999-02-14 18:05:09 C 03 03 42.32 -15 49 53.4 017
1999-02-14 18:09:32 C 03 03 42.91 -15 49 51.0 017
1999-02-14 18:13:58 C 03 03 43.41 -15 49 48.1 017
1999-02-14 18:18:20 C 03 03 43.98 -15 49 45.8 017
1999-02-16 11:21:32 C 03 08 55.97 -15 24 58.2 897
1999-02-16 11:29:38 C 03 08 56.86 -15 24 53.4 897
1999-02-17 10:52:28 C 03 11 52.68 -15 10 43.5 896
1999-02-25 09:57:36 C 03 34 56.91 -13 17 20.1 351
1999-02-25 10:09:46 C 03 34 58.27 -13 17 12.8 351
1999-02-25 10:37:12 C 03 35 01.43 -13 16 57.8 351
1999-02-27 00:07:47 C 03 39 23.54 -12 55 10.9 758
1999-02-27 00:27:39 C 03 39 25.59 -12 54 59.9 758
1999-03-01 17:28:22 C 03 46 52.41 -12 17 47.2 118
1999-03-01 17:54:40 C 03 46 55.36 -12 17 31.6 118
1999-03-01 18:02:43 C 03 46 56.28 -12 17 27.5 118
1999-03-04 01:01:48 C 03 53 07.03 -11 46 33.6 739
1999-03-06 11:06:31 C 03 59 32.99 -11 14 24.6 351
1999-03-06 11:19:46 C 03 59 34.35 -11 14 18.9 351
1999-03-16 10:21:33 C 04 25 01.62 -09 09 45.4 897
1999-03-16 10:29:49 C 04 25 02.70 -09 09 40.5 897
1999-03-16 10:49:32 C 04 25 04.65 -09 09 31.6 351
1999-03-16 10:55:54 C 04 25 05.49 -09 09 26.3 351
1999-03-22 10:23:27 C 04 39 41.16 -08 01 06.5 897
1999-03-22 10:47:40 C 04 39 43.58 -08 00 55.6 897
1999-04-01 18:20:24 C 05 03 53.03 -06 15 37.1 118
1999-04-01 18:25:31 C 05 03 53.54 -06 15 35.5 118
1999-04-01 18:29:40 C 05 03 53.92 -06 15 34.0 118
1999-04-04 10:26:49 C 05 09 56.53 -05 51 03.8 351
1999-04-04 10:35:29 C 05 09 57.59 -05 50 57.6 351
1999-04-07 10:36:00 C 05 16 40.87 -05 24 41.6 360
1999-04-07 10:39:30 C 05 16 41.22 -05 24 40.5 360
1999-04-07 10:45:33 C 05 16 41.90 -05 24 41.0 897