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Envisat Orbit Prediction Error

The following table shows the RMS of the daily computed along-track errors over 1 orbit after 1, 3, and 6 days of Envisat orbit prediction.

Envisat (meters)

Month	after 1 day	after 3 days	after 6 days	Comment
December 2011	31	196	555	Increased solar activity
November 2011	55	429	596	Increased solar activity
October 2011	34	384	1195	Increased solar activity
September 2011	20	222	505	Increased solar activity
August 2011	10	72	500	Increased solar activity
July 2011	9	60	202	.
June 2011	14	63	193	.
May 2011	14	87	375	.
April 2011	30	203	357	.
March 2011	17	133	432	.
February 2011	10	69	254	.
January 2011	13	46	144	.
December 2010	10	47	173	.
November 2010	14	82	350	.
October 2010	21	59	250	.
September 2010	14	67	239	.
August 2010	12	69	268	.
July 2010	13	62	174	.
June 2010	14	50	145	.
May 2010	13	63	197	.
April 2010	14	58	187	.
March 2010	17	62	173	.
February 2010	19	65	125	.
January 2010	14	54	175	.
December 2009	18	39	108	.
November 2009	14	61	182	.
October 2009	12	41	123	.
September 2009	18	56	157	.
August 2009	14	50	149	.
July 2009	12	49	171	.
June 2009	15	64	205	.
May 2009	16	83	300	.
April 2009	19	60	155	.
March 2009	14	55	184	.
February 2009	14	57	152	.
January 2009	11	41	130	.
December 2008	12	49	160	.
November 2008	12	54	194	.
October 2008	11	46	148	.
September 2008	11	38	128	.
August 2008	11	50	159	.
July 2008	12	47	144	.
June 2008	12	45	161	.
May 2008	14	47	127	.
May 2008	14	47	127	.
April 2008	12	51	173	.
March 2008	11	42	122	.
February 2008	12	47	154	.
January 2008	12	56	144	.
December 2007	16	71	236	.
November 2007	12	75	195	.
October 2007	11	50	180	.
September 2007	10	50	160	.
August 2007	10	42	145	.
July 2007	10	43	119	.
June 2007	12	50	157	statistics incomplete. Only half a month of statistics available
May 2007	13	49	157	.
April 2007	12	46	148	.
March 2007	12	40	88	.
February 2007	13	95	306	.
January 2007	12	53	185	.
December 2006	17	94	380	.
November 2006	13	75	239	.
October 2006	15	78	274	.
September 2006	13	46	156	.
August 2006	11	50	168	.
July 2006	11	50	168	.
June 2006	10	59	194	.
May 2006	13	75	262	.
April 2006	14	70	212	.
March 2006	14	42	140	.
February 2006	12	59	206	.
January 2006	15	89	289	.
December 2005	15	95	345	.
November 2005	15	87	312	.
October 2005	13	72	260	.
September 2005	12	95	421	.
August 2005	20	106	356	.
July 2005	13	93	353	.
June 2005	15	64	337	.
May 2005	23	142	452	.
April 2005	14	90	316	.
March 2005	15	89	326	.
February 2005	19	117	433	.
January 2005	30	194	704	.
December 2004	15	126	523	.
November 2004	22	180	747	.
October 2004	20	144	566	.
September 2004	17	96	293	.
August 2004	16	54	214	.
July 2004	21	130	554	.
June 2004	13	55	160	.
May 2004	12	65	218	.
April 2004	19	107	266	.
March 2004	20	154	611	.
February 2004	23	193	736	.
January 2004	30	184	560	.
December 2003	28	162	521	.
November 2003	52	784	1916	.
October 2003	21	163	630	.
September 2003	20	139	430	.
August 2003	31	192	525	.
July 2003	24	141	471	.
June 2003	22	140	476	.
May 2003	48	339	1299	.
April 2003	21	150	443	statistics incomplete
March 2003	38	390	1560	statistics incomplete
February 2003	38	250	724	statistics incomplete
January 2003	34	307	1144	.
December 2002	81	621	1939	Increased solar activity
November 2002	67	415	1067	.
October 2002	84	508	1570	.
September 2002	84	597	1797	Degradation of predictions due to increased number of manoeuvres
August 2002	56	544	2150	Degradation of predictions due to a period of increased solar activity
July 2002	23	151	609	.
June 2002	17	142	699	Statistics available from the 9th of June onwards

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