ERS Orbit Prediction Error

The following table shows the RMS of the daily computed along-track errors for ERS-2 only.

ERS-2 (meters)

Month	after 1 day	after 3 days	after 6 days	Comment
April 2009	13	57	168	.
March 2009	13	58	198	.
February 2009	13	45	115	.
January 2009	11	45	181	.
December 2008	11	53	210	.
November 2008	-	-	-	No data available
October 2008	-	-	-	No data available
September 2008	-	-	-	No data available
August 2008	11	45	110	.
July 2008	11	38	130	.
June 2008	12	53	173	.
May 2008	12	53	168	.
April 2008	12	60	212	.
March 2008	9	43	149	.
February 2008	-	-	-	No data available
January 2008	-	-	-	No data available
December 2007	-	-	-	No data available
November 2007	-	-	-	No data available
October 2007	-	-	-	No data available
September 2007	-	-	-	No data available
August 2007	12	47	148	.
July 2007	11	48	136	.
June 2007	11	45	138	.
May 2007	13	58	171	.
April 2007	12	56	191	.
March 2007	12	41	121	.
February 2007	19	79	251	.
January 2007	11	55	176	.
December 2006	18	90	368	.
November 2006	13	83	302	.
October 2006	12	60	179	.
September 2006	11	46	155	.
August 2006	13	81	315	.
July 2006	13	51	167	.
June 2006	14	61	201	.
May 2006	15	81	245	.
April 2006	15	76	232	.
March 2006	12	52	162	.
February 2006	11	56	191	.
January 2006	13	68	250	.
December 2005	16	104	358	.
November 2005	15	112	492	.
October 2005	13	79	257	.
September 2005	17	99	349	.
August 2005	25	122	410	.
July 2005	15	116	433	.
June 2005	15	93	306	.
May 2005	31	186	616	.
April 2005	16	98	284	.
March 2005	14	95	355	.
February 2005	17	146	516	.
January 2005	23	202	594	.
December 2004	14	152	648	.
November 2004	23	290	732	.
October 2004	17	181	616	.
September 2004	16	84	293	.
August 2004	17	95	319	.
July 2004	22	155	489	.
June 2004	11	58	223	Only half a month of statistics available
May 2004	14	85	257	Only half a month of statistics available
April 2004	-	-	-	No statistics available
March 2004	-	-	-	No statistics available
February 2004	-	-	-	No statistics available
January 2004	-	-	-	No statistics available
December 2003	-	-	-	No statistics available
November 2003	-	-	-	No statistics available
October 2003	51	254	924	.
September 2003	20	162	523	.
August 2003	41	242	930	.
July 2003	-	-	-	No reliable statistics
June 2003	26	192	790	.
May 2003	59	385	1353	.
April 2003	31	216	868	.
March 2003	64	455	1802	.
February 2003	110	475	1506	.
January 2003	110	447	733	.
December 2002	95	653	2523	.
November 2002	95	557	1922	.
October 2002	109	435	726	.
September 2002	119	721	-	Peaks of increased solar activity
August 2002	73	554	1657	.
July 2002	29	162	784	.
June 2002	36	318	1405	.
May 2002	91	443	1394	.
April 2002	-	-	-	.
March 2002	-	-	-	.
February 2002	-	-	-	.
January 2002	-	-	-	.
December 2001	270	1252	-	.
November 2001	416	-	-	Increased solar activity and manoeuvres
October 2001	389	-	-	Increased solar activity
September 2001	183	1306	-	.
August 2001	107	365	825	.
July 2001	35	272	818	.
June 2001	37	270	1323	.
May 2001	79	637	-	.
April 2001	289	1297	-	.
March 2001	304	1341	-	.
February 2001	-	-	-	No reliable statistics available
January 2001	41	206	764	Only first half of January used because of safe mode
December 2000	146	989	-	.
November 2000	283	2210	-	Increased solar activity and a higher number of manoeuvres required than usual
October 2000	342	1570	-	Increased solar activity
September 2000	145	1049	-	.
August 2000	95	658	1031	.
July 2000	302	1355	1067	Short burst of high solar activity mid July
June 2000	75	630	1762	.
May 2000	111	781	1281	.
April 2000	163	1067	2379	.
March 2000	220	1881	-	Large fluctuations of solar activity

The following table shows the RMS of the daily computed along-track errors for both ERS-1 and ERS-2.

ERS-1 / ERS-2 (meters)

Month	after 1 day	after 3 days	after 6 days	Comment
February 2000	160 / 300	945 / 1809	- / -	ERS-2 monogyro piloting started
January 2000	86 / 77	368 / 346	970 / 846	.
December '99	86 / 78	619 / 572	- / 1901	.
November '99	154 / 136	713 / 910	- / -	.
October '99	126 /117	739 / 677	- / -	.
September '99	73 / 72	443 / 398	- / 1031	.
August '99	78 / 56	554 / 408	- / 875	.
July '99	202 / 64	884 / 495	- / 1787	.
June '99	39 / 38	330 / 319	- / 1315	.
May '99	34 / 31	254 / 213	1039 / 763	.
February '99	88 / 88	618 / 610	2401 / 2268	.
January '99	- / 46	- / 296	- / 1036	No reliable statistics for ERS-1
December '98	59 / 61	493 / 486	1049 / 1916	.
November '98	- / 91	- / 637	- / -	No reliable statistics for ERS-1 due to frequent manoeuvres and on-board anomaly
October '98	- / 45	- / 251	- / 894	No reliable statistics for ERS-1 due to frequent manoeuvres
September '98	56 / 50	458 / 370	1505 / 1268	.
August '98	84 / 47	363 / 280	1290 / 1049	.
July '98	26 / 21	121 / 90	388 / 327	.
...	...	...	...	...
November '97	24 / 19	113 / 98	357 / 266	.
October '97	23 / 15	117 / 99	346 / 228	.
September '97	17 / 19	86 / 85	316 / 315	.
August '97	13 / 14	52 / 55	168 / 182	.
July '97	13 / 13	50 / 47	175 / 143	.
June '97	14 / 16	62 / 66	245 / 244	.
May '97	19 / 17	82 / 68	257 / 179	.
April '97	16 / 16	82 / 58	278 / 213	.
March '97	16 / 14	81 / 71	257 / 218	.
February '97	11 / (15)	50 / (47)	184 / (148)	.
January '97	12 / 14	40 / 46	117 / 148	.
December '96	14 / 14	60 / 76	190 / (101)	.
November '96	17 / 16	91 / 84	306 / 247	.
October '96	37 / 15	122 / 97	393 / 328	.
September '96	16 / 16	95 / 79	322 / 260	.
August '96	12 / 15	39 / 54	86 / 116	.
July '96	14 / 15	75 / 77	298 / 312	.
June '96	14 / 31	66 / 90	247 / 267	.
May '96	14 / 14	59 / 55	101 / 158	.
April '96	16 / 14	75 / 67	164 / 139	.
March '96	12 / 13	49 / 51	162 / 195	.
February '96	15 / 13	56 / 57	195 / 187	.
January '96	16 / 57	75 / 171	220 / 289	ERS-2 values affected by anomaly (unmodeled thrusting)
December '95	15 / 14	64 / 68	215 / 280	.
November '95	36 / 15	122 / 56	177 / 178	.
October '95	30 / 20	111 / 98	326 / 274	.
September '95	13 / 18	50 / 53	148 / 106	.
August '95	14 / 14	58 / 57	201 / 200	.
July '95	14 / 12	50 / 51	173 / 165	.
June '95	17 / 16	71 / 72	197 / 227	.
May '95	23 / 18	105 / 97	202 / 199	.

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