Observing Statistics

The following table summarises time spent observing at Great Shefford each month:

	[A]	[B]	[C]	[D]	[E]	[F]	[G]	[H]
Month	Nights used	Hours spent imaging	Time CCD exposing	Avg. session (hours)	Images acquired	Avg. time between exposures	Average exposure length	Efficiency [G]/[F]	Comments
2011 total	157	714.2	16d 15h	4.5	96026	27s	15s	55.8%	Available on 306/365 nights
2011-Dec	14	80.8	2d 00h	5.8	10320	28s	17s	59.5%
2011-Nov	9	51.3	1d 07h	5.7	5868	31s	19s	60.9%	Out of operation 5 nights (business travel)
2011-Oct	6	40.1	18h 58m	6.7	3622	40s	19s	47.3%	Out of operation 16 nights (business travel)
2011-Sep	17	85.3	1d 23h	5.0	10594	29s	16s	54.7%
2011-Aug	11	36.4	20h 43m	3.3	3845	34s	19s	59.9%	Worst Aug since 2002
2011-Jul	13	34.3	21h 18m	2.6	3978	31s	19s	62.2%
2011-Jun	18	61.2	1d 08h	3.4	8852	25s	13s	52.9%
2011-May	16	67.5	1d 14h	4.2	8659	28s	16s	56.9%
2011-Apr	21	107.4	2d 12h	5.1	15508	25s	14s	55.4%
2011-Mar	16	81.8	1d 15h	5.1	14722	20s	10s	48.2%
2011-Feb	7	26.0	15h 06m	3.7	4067	23s	13s	58.1%	Worst Feb since 2002
2011-Jan	9	42.1	1d 03h	4.7	5991	25s	16s	63.9%	Worst Jan since 2002
2010 total	169	702.3	15d 15h	4.2	112657	22s	12s	53.4%	Available on 347/365 nights
2010-Dec	10	48.9	1d 03h	4.9	7615	23s	13s	55.6%	Worst Dec since 2002
2010-Nov	13	41.7	17h 02m	3.2	6473	23s	9s	40.9%	Unusually poor conditions for Nov, worst since 2003
2010-Oct	17	69.3	1d 14h	4.1	11415	22s	12s	54.6%
2010-Sep	17	85.4	1d 13h	5.0	12441	25s	11s	43.7%
2010-Aug	14	61.5	1d 10h	4.4	6473	34s	19s	55.9%
2010-Jul	10	21.3	12h 36m	2.1	3074	25s	15s	59.4%	Worst conditions since 2007-Jun
2010-Jun	17	53.7	1d 06h	3.2	8089	24s	13s	55.1%
2010-May	14	56.9	1d 04h	4.1	11618	18s	9s	48.6%
2010-Apr	19	70.6	1d 11h	3.7	14279	18s	9s	48.9%
2010-Mar	14	77.6	1d 16h	5.5	11501	24s	13s	52.1%
2010-Feb	12	50.9	1d 09h	4.2	8347	22s	14s	64.6%
2010-Jan	12	64.7	1d 20h	5.4	11332	21s	14s	67.7%
2009 total	202	938.2	24d 00h	4.6	148361	23s	14s	61.4%	Available on 353/365 nights
2009-Dec	15	77.6	2d 04h	5.2	11455	24s	8s	66.5%
2009-Nov	18	87.2	1d 20h	4.8	15481	20s	10s	50.8%
2009-Oct	13	69.9	1d 20h	5.4	15994	16s	10s	62.8%
2009-Sep	19	103.6	2d 11h	5.5	13615	27s	15s	56.6%
2009-Aug	18	96.3	2d 05h	5.3	18278	19s	11s	55.5%
2009-Jul	16	48.4	1d 14h	3.0	5241	33s	26s	78.7%
2009-Jun	18	49.0	1d 07h	2.7	9473	19s	12s	64.1%
2009-May	23	84.0	2d 04h	3.7	11327	27s	17s	62.3%
2009-Apr	17	71.8	2d 03h	4.2	10405	25s	18s	71.2%
2009-Mar	19	114.5	2d 16h	6.0	19191	21s	12s	56.2%
2009-Feb	12	54.6	1d 09h	4.5	6351	31s	19s	61.1%
2009-Jan	14	81.4	2d 05h	5.8	11550	25s	17s	65.6%
2008 total	171	753.8	21d 13h	4.4	91715	30s	20s	68.6%	Available on 348/365 nights
2008-Dec	15	76.4	2d 02h	5.1	9121	30s	20s	65.7%
2008-Nov	11	52.7	1d 11h	4.8	5608	34s	23s	66.8%
2008-Oct	20	125.3	3d 22h	6.3	14971	30s	23s	75.0%
2008-Sep	14	70.6	1d 21h	5.0	7498	34s	22s	63.5%
2008-Aug	14	50.6	1d 10h	3.6	5946	31s	20s	66.5%
2008-Jul	13	25.0	17h 24m	1.9	2672	34s	23s	69.7%
2008-Jun	16	47.4	1d 10h	3.0	7321	23s	16s	70.7%
2008-May	10	30.2	22h 21m	3.0	4086	27s	20s	74.0%
2008-Apr	15	62.2	1d 19h	4.1	8110	28s	19s	68.7%
2008-Mar	16	58.7	1d 10h	3.7	6779	31s	18s	58.6%	Out of operation 7 nights
2008-Feb	15	101.8	2d 22h	6.8	13810	27s	18s	69.2%
2008-Jan	12	53.0	1d 14h	4.4	5793	33s	24s	72.7%
2007 total	178	819.7	22d 03h	4.6	92025	32s	21s	64.8%	Available on 347/365 nights
2007-Dec	15	82.5	2d 09h	5.5	7034	42s	29s	69.2%
2007-Nov	14	72.9	2d 00h	5.2	9979	26s	17s	66.1%
2007-Oct	13	52.5	1d 09h	4.0	6206	30s	19s	62.5%
2007-Sep	17	96.3	2d 13h	5.7	10615	33s	21s	63.6%
2007-Aug	15	71.0	1d 21h	4.7	7286	35s	22s	63.8%
2007-Jul	16	49.9	23h 38m	3.1	4578	39s	19s	47.4%	Poor weather continued, flooding on 20 July.
2007-Jun	8	20.4	12h 34m	2.5	3292	22s	14s	61.8%	Very poor weather across the UK in May & especially June, which was the cloudiest month since 2002 Dec.
2007-May	14	40.8	1d 03h	2.9	4343	34s	22s	65.5%
2007-Apr	20	98.7	2d 13h	4.9	12123	29s	18s	61.6%
2007-Mar	16	98.1	2d 12h	6.1	12030	29s	18s	61.6%
2007-Feb	12	52.4	1d 14h	4.4	5884	32s	24s	73.4%
2007-Jan	18	84.3	2d 16h	4.7	8655	35s	26s	75.4%
2006 total	169	798.5	21d 03h	4.7	80515	36s	23s	63.5%	Available on 350/365 nights
2006-Dec	10	59.2	1d 20h	5.9	6583	32s	24s	74.3%
2006-Nov	16	105.1	2d 15h	6.6	9553	40s	24s	59.6%
2006-Oct	14	94.0	2d 12h	6.7	8989	38s	24s	64.2%
2006-Sep	14	70.2	1d 17h	5.0	7805	32s	19s	58.4%
2006-Aug	16	51.4	1d 07h	3.2	4282	43s	26s	60.7%
2006-Jul	16	61.6	1d 18h	3.9	5680	39s	27s	68.0%
2006-Jun	13	37.3	23h 49h	2.9	4473	30s	19s	63.9%
2006-May	13	38.9	22h 00h	3.0	4693	30s	17s	56.5%
2006-Apr	19	87.9	2d 12h	4.6	8056	39s	27s	68.2%
2006-Mar	11	67.0	1d 18h	6.1	6112	39s	25s	62.8%
2006-Feb	14	53.5	1d 09h	3.8	5520	35s	22s	62.0%
2006-Jan	13	72.3	1d 21h	5.6	8769	30s	18s	62.3%
2005 total	181	841.5	18d 06h	4.7	69239	44s	23s	52.1%	Available on 332/365 nights
2005-Dec	17	101.5	2d 16h	6.0	9124	40s	25s	62.9%
2005-Nov	16	112.3	3d 03h	7.0	11225	36s	24s	66.8%
2005-Oct	14	60.5	1d 15h	4.3	6792	32s	21s	64.5%
2005-Sep	12 (9th-30th)	50.0	1d 06h	4.2	4297	42s	26s	63.5%	Out of operation from 15Aug-09Sep (CCD being upgraded)
2005-Aug	11 (1st-14th)	42.1	19h 11m	3.8	2800	54s	25s	45.6%	Out of operation from 15Aug-09Sep (CCD being upgraded)
2005-Jul	18	61.0	1d 01h	3.4	4267	51s	21s	40.3%
2005-Jun	11	35.5	15h 40m	3.2	2802	46s	20s	44.2%	Out of operation 7 nights (Telescope being upgraded)
2005-May	21	66.6	1d 07h	3.2	5787	41s	19s	45.8%
2005-Apr	18	79.7	1d 14h	4.4	6014	48s	23s	48.2%
2005-Mar	15	74.2	1d 08h	4.9	5281	51s	22s	43.4%
2005-Feb	13	55.0	1d 00h	4.2	3604	55s	24s	43.7%
2005-Jan	15	103.2	1d 21h	6.9	7246	51s	22s	43.4%
2004 total	182	774.6	12d 15h	4.3	53725	52s	20s	39.1%	Available on 361/365 nights
2004-Dec	17	97.1	1d 13h	5.7	7005	50s	19s	38.4%
2004-Nov	14	62.5	1d 03h	4.5	4235	53s	23s	43.9%
2004-Oct	15	57.6	1d 01h	3.8	4226	49s	22s	44.5%
2004-Sep	17	93.4	1d 18h	5.5	7402	45s	21s	46.0%
2004-Aug	18	67.6	1d 06h	3.8	5184	47s	21s	44.8%
2004-Jul	15	30.4	14h 43m	2.0	2173	50s	24s	48.5%
2004-Jun	17	41.4	17h 38m	2.4	3395	44s	19s	42.6%
2004-May	13	46.0	18h 05m	3.5	3872	43s	17s	39.3%
2004-Apr	13	63.2	21h 37m	4.9	4964	46s	16s	34.2%
2004-Mar	16	70.3	23h 31m	4.4	4492	56s	19s	33.5%
2004-Feb	16	75.7	1d 00h	4.7	3592	1m16s	24s	32.0%
2004-Jan	11	69.6	19h 47m	6.3	3185	1m19s	22s	28.4%
2003 total	183	701.1	7d 13h	3.8	28090	1m30s	23s	25.8%	Available on 347/365 nights
2003-Dec	13	83.6	1d 01h	6.4	3965	1m16s	23s	30.8%
2003-Nov	10	36.2	8h 48m	3.6	1539	1m25s	21s	24.3%
2003-Oct	15	77.7	23h 46m	5.2	3713	1m15s	23s	30.6%
2003-Sep	23	110.7	1d 03h	4.8	4334	1m32s	22s	24.4%
2003-Aug	18	61.6	16h 22m	3.4	2146	1m43s	27s	26.6%
2003-Jul	16	42.7	9h 39m	2.7	1619	1m35s	21s	22.6%
2003-Jun	7	20.9	7h 06m	3.0	967	1m18s	26s	34.0%
2003-May	13	30.9	8h 47m	2.4	1242	1m29s	25s	28.5%
2003-Apr	17	52.5	12h 03m	3.1	1992	1m35s	22s	23.0%
2003-Mar	18	68.9	13h 35m	3.8	2674	1m33s	18s	19.7%
2003-Feb	16	58.5	13h 31m	3.7	1983	1m46s	25s	23.1%
2003-Jan	17	57.0	14h 37m	3.4	1916	1m47s	27s	25.7%
2002 total	87	164.3	1d 02h	1.9	3042	3m14s	31s	15.8%	Available on 230/365 nights
2002-Dec	5	11.6	2h 38m	2.3	323	2m09s	29s	22.8%
2002-Nov	13	16.3	3h 27m	1.3	419	2m20s	30s	21.2%
2002-Oct	9	35.6	4h 03m	4.0	506	4m13s	29s	11.4%
2002-Sep	15	24.1	4h 14m	1.6	509	2m51s	30s	17.6%
2002-Aug	18	34.7	5h 05m	1.9	645	3m14s	28s	14.7%
2002-Jul	15	26.0	3h 40m	1.7	411	3m48s	32s	14.1%
2002-Jun	8	12.7	2h 11m	1.6	169	4m30s	47s	17.3%
2002-May	4	3.4	35m	0.8	60	3m21s	36s	17.7%	First light 16th May