Epsilon
Aurigae
2009-2011 Eclipse Predictions and Results
The 2009 eclipse predictions are based on the 1982 - 1984 eclipse. Because the first and fourth contact points were at out-of-season times (when epsilon Aurigae was close to the Sun in alignment) and because of the large variations in out-of-eclipse data, the precise times cannot be calculated.
Our official V Band predictions are as follows:
1st Contact: JD= 2,455,055
Tuesday, 11 August 20092nd Contact: JD= 2,455,185
Saturday, 19 December 2009Mid Eclipse: JD= 2,455,413
Wednesday. 04 August 20103rd Contact: JD= 2,455,640
Saturday, 19 March 20114th Contact: JD= 2,455,695
Friday 13 May 2011
Contact Times as Calculated from Current Data
(as of 17 January 2010)1st Contact
V Band: JD= 2,455,056.345 - 12 August 2009
B Band: JD= 2,455,054.465 - 10 August 2009
U Band: JD= 2,455,054.208 - 10 August 30092nd Contact:
V Band: JD= 2,455,213.003 - 16 January 2010
B Band: JD= 2,455,214.268 - 17 January 2010
U Band: JD= 2,455,237.182 - 09 February 2010Mid Eclipse: ?
V Band:
B Band:
U Band:
3rd Contact: ?
V Band:
B Band:
U Band:4th Contact: ?
V Band:
B Band:
U Band:
From the 1982 - 1984 eclipse the following data were determined. The contact items were determined by using an out-of-eclipse average magnitude for each band and drawing an ingress and egress line. An average totality was also determined. The intersection of the ingress and egress slopes with the average out-of-eclipse and totality determined the contact points. Period is assumed at 9885 days.
1982/84 V Data:
Average Out-of-Eclipse Magnitude was assumed to be 3.03
Average Totality was assumed to be 3.73
2nd Contact: JD= 2,445,300
Mid-Eclipse: JD= 2,445,544
3rd Contact: JD= 2,445,747
4th Contact: JD= 2,445,812
Ingress 142 days
Totality 447 days
Egress 65 days
Total Eclipse: 654 days
1982/84 B Data:
Average Out-of-Eclipse Magnitude was assumed to be 3.61
Average Totality was assumed to be 4.32
2nd Contact: JD= 2,445,305
Mid-Eclipse: JD= 2,445,524
3rd Contact: JD= 2,445,742
4th Contact: JD= 2,445,813
Ingress 135 days
Totality 437 days
Egress 71 days
Total Eclipse: 643 days
1982/84 U Data:
Average Out-of-Eclipse Magnitude was assumed to be 3.73
Average Totality was assumed to be 4.57
2nd Contact: JD= 2,445,300
Mid-Eclipse: JD= 2,445,528
3rd Contact: JD= 2,445,755
4th Contact: JD= 2,445,810
Ingress 120 days
Totality 455 days
Egress days
Total Eclipse: 630 days
|
Filter
|
1st
|
2nd
|
Mid
|
3rd
|
4th
|
|
V
|
5,158
|
5,300
|
5,544
|
5,747
|
5,812
|
|
B
|
5,170
|
5,305
|
5,524
|
5,742
|
5,813
|
|
U
|
5,180
|
5,300
|
5,528
|
5,755
|
5,810
|
JD 2,440,000 +
|
Filter
|
Ingress
|
Totality
|
Egress
|
Total
|
|
V
|
142 days
|
447 days
|
65 days
|
654 days
|
|
B
|
135 days
|
437 days
|
71 days
|
643 days
|
|
U
|
120 days
|
455 days
|
55 days
|
630 days
|
Created 21 September 2007
Modified 17 January 2010
