1866 Sisyphus — IAA Minor Planet Database

Orbital Elements

Epoch (TDB)	2025-11-21 (JD 2461000.5)
Eccentricity (e)	0.5381207270 ± 5.42e-09
Semi-major axis (a)	1.8933719410 AU ± 4.50e-10
Inclination (i)	41.20633494° ± 7.87e-07
Long. of Asc. Node (Ω)	63.44668864° ± 1.04e-06
Arg. of Perihelion (ω)	293.09862767° ± 1.07e-06
Mean Anomaly (M)	140.66424737° ± 8.67e-07
Mean Motion (n)	0.3783191899°/day ± 1.35e-10
Perihelion dist (q)	0.87450926 AU ± 1.03e-08
Aphelion dist (Q)	2.91223463 AU ± 1.03e-08
Orbital Period	2.60527700 yr ± 9.28e-10

Physical Parameters

H (abs. magnitude)	12.48
G (slope)	0.15

Orbit Solution

Source	IAA
Solution Date	2026-05-31
RMS Residual	0.220″
Uncertainty	0
Orbit Type	Apollo
MOID	0.102869 AU
Observations Used	9210
Radar Obs Used	1
Gaia Obs Used	79
Oppositions	38
Arc Total	1955-2026
First Observation Used	1955-01-26
Last Observation Used	2026-04-06

Observations (11960)

Date	Type	RA	Dec	Mag	Band	Observatory
2020-01-08 23:14:23	S	06 41 00.072	+80 32 21.08	–	V	C57
2020-01-08 23:14:23	s	1 +140560.02	7 +191150.80	2740.0	–	C57
2020-01-08 23:44:23	S	06 40 48.662	+80 32 26.27	–	V	C57
2020-01-08 23:44:23	s	1 +140188.09	6 +193452.87	9070.0	–	C57
2020-01-09 00:14:23	S	06 40 37.109	+80 32 30.98	–	V	C57
2020-01-09 00:14:23	s	1 +139803.07	0 +195737.32	5740.0	–	C57
2020-01-09 00:44:23	S	06 40 25.639	+80 32 34.55	–	V	C57
2020-01-09 00:44:23	s	1 +139405.23	2 +198004.29	3370.0	–	C57
2020-01-09 01:14:23	S	06 40 13.956	+80 32 38.54	–	V	C57
2020-01-09 01:14:23	s	1 +138994.86	3 +200253.94	2590.0	–	C57
2020-01-09 01:44:23	S	06 40 02.422	+80 32 43.62	–	V	C57
2020-01-09 01:44:23	s	1 +138572.23	0 +202486.39	3990.0	–	C57
2020-01-09 02:14:23	S	06 39 51.173	+80 32 47.22	–	V	C57
2020-01-09 02:14:23	s	1 +138137.59	5 +204701.80	8140.0	–	C57
2020-01-09 02:44:23	S	06 39 39.742	+80 32 51.22	–	V	C57
2020-01-09 02:44:23	s	1 +137691.21	3 +206900.29	5630.0	–	C57
2020-01-09 03:14:23	S	06 39 28.135	+80 32 55.75	–	V	C57
2020-01-09 03:14:23	s	1 +137233.33	0 +209082.01	7000.0	–	C57
2020-01-09 03:44:23	S	06 39 16.514	+80 32 59.60	–	V	C57
2020-01-09 03:44:23	s	1 +136764.18	6 +211247.08	2780.0	–	C57
2020-01-09 04:14:23	S	06 39 05.316	+80 33 03.28	–	V	C57
2020-01-09 04:14:23	s	1 +136284.01	4 +213395.65	3490.0	–	C57
2020-01-09 04:44:23	S	06 38 53.515	+80 33 06.80	–	V	C57
2020-01-09 04:44:23	s	1 +135793.04	1 +215527.83	9650.0	–	C57
2020-01-09 05:14:23	S	06 38 42.079	+80 33 11.12	–	V	C57
2020-01-09 05:14:23	s	1 +135291.48	6 +217643.77	1750.0	–	C57
2020-01-09 05:44:23	S	06 38 30.490	+80 33 14.76	–	V	C57
2020-01-09 05:44:23	s	1 +134779.56	5 +219743.58	260.0	–	C57
2020-01-09 06:14:23	S	06 38 19.075	+80 33 18.00	–	V	C57
2020-01-09 06:14:23	s	1 +134257.48	6 +221827.39	5670.0	–	C57
2020-01-09 07:44:23	S	06 37 44.515	+80 33 28.91	–	V	C57
2020-01-09 07:44:23	s	1 +132632.30	3 +227984.03	7700.0	–	C57
2020-01-09 08:14:23	S	06 37 32.782	+80 33 32.29	–	V	C57
2020-01-09 08:14:23	s	1 +132071.56	7 +230005.04	5100.0	–	C57
2020-01-09 08:44:23	S	06 37 21.398	+80 33 35.82	–	V	C57
2020-01-09 08:44:23	s	1 +131501.63	7 +232010.64	1560.0	–	C57
2020-01-09 09:14:23	S	06 37 09.833	+80 33 39.35	–	V	C57
2020-01-09 09:14:23	s	1 +130922.69	0 +234000.96	7470.0	–	C57
2020-01-09 09:44:23	S	06 36 58.274	+80 33 42.52	–	V	C57
2020-01-09 09:44:23	s	1 +130334.89	8 +235976.09	3220.0	–	C57
2020-01-09 10:14:23	S	06 36 46.867	+80 33 45.04	–	V	C57
2020-01-09 10:14:23	s	1 +129738.43	3 +237936.14	9200.0	–	C57
2020-01-09 10:44:23	S	06 36 34.946	+80 33 48.82	–	V	C57
2020-01-09 10:44:23	s	1 +129133.45	7 +239881.23	5780.0	–	C57
2020-01-09 11:14:23	S	06 36 23.659	+80 33 51.95	–	V	C57
2020-01-09 11:14:23	s	1 +128520.13	3 +241811.47	3320.0	–	C57
2020-01-09 16:14:23	S	06 34 28.378	+80 34 18.59	–	V	C57
2020-01-09 16:14:23	s	1 +121958.81	3 +260319.40	1200.0	–	C57
2020-01-09 16:44:23	S	06 34 16.546	+80 34 21.04	–	V	C57
2020-01-09 16:44:23	s	1 +121263.24	1 +262092.77	720.0	–	C57

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Epoch (UTC)	Value	Sigma	Units	Freq (MHz)	Receiver	Transmitter
1985-12-08 00:00:00	-295248	20	Hz	2380	-1	-1
1985-12-08.000000	-29524800	2000	Hz	2380	251	251

1866 Sisyphus (1972 XA)