Table 2 - Oblateness Estimates as 1/f
From acceptable crater timings with 0<%E<4 %
Date	Immersion Timings			Emersion Timings
	Number	Mean f	sd	Number	Mean f	sd
1974 Nov 29	70	266.6	0.01	23	95.7	0.06
1978 Mar 24	266	116.2	0.03	24	50.7	0.15
1978 Sep 16	532	67.9	0.04	11	83.9	0.01
1979 Mar 13	43	254.4	0.01	-	0
1979 Sep 6	70	161.8	0.07	79	0	0.04
1981 Jul 17	23	93.8	0.01	-	0
1982 Jan 9	236	133.8	0.03	-	0
1982 Jul 6	47	-	0.04	233	30.5	0.02
1982 Dec 30	38	54.4	0.05	11	111.5	0.07
1983 Jun 25	92	156.6	0.01	14	52.9	0.09
1985 May 4	345	121.8	0.06	102	120.7	0.05
1985 Oct 28	107	134.3	0.09	38	134.7	0.03
1986 Apr 24	513	45.9	0.03	164	225.1	0.08
1986 Oct 17	303	84.4	0.03	124	165.5	0.04
1988 Aug 27	39	-	0.18	41	143.1	0.02
1989 Feb 20	185	180.5	0.05	67	73.1	0.04
1989 Aug 17	148	70	0.08	13	0	0.11
1992 Jun 15	40	68	0.11	17	106.5	0.01
1992 Dec 9	27	46.6	0.01	32	118.1	0.06
1993 Jun 4	132	95.5	0.03	7	219.2	0.02
1993 Nov 29	18	79.2	0.07	0	0
1995 Apr 15	0			32	22.5	0.01
1996 Apr 4	230	45.1	0.03	154	111.2	0.06
1996 Sep 27	68	37.5	0.04	54	100.3	0.07
1997 Mar 24	42	80.4	0.06	11	54.5	0.08
1997 Sep 16	195	175.8	0.03	75	56.5	0.01
2000 Jan 21	133	135.6	0.03	0	0
2000 Jul 16	214	97.7	0.02	175	65.4	0.01
2001 Jan 9	192	265.7	0.04	48	189	0.02
2003 Nov 9	35	163.6	0.03	105	120.8	0.04
2004 Oct 28	59	50.5	0.02	0	0
2007 Mar 3	15	184.9	0.07	23	30.2	0.03
2007 Aug 28	46	303.4	0.04	46	50	0.001
sum	4503	3771.9	1.45	1723	2531.6	1.231
mean		121.67	0.04		81.66	0.03
Legend for Table 2
Number of crater timing observations statistically accepted for analysis
Mean f is the estimated reciprocal oblateness of the umbra
sd is the standard deviation
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