[vsnet-ecl 284] (fwd) BL Tel 2000 Eclipse Summary

[Taichi Kato <tkato>]

From: "Peter F Williams" <pfwilliams@onaustralia.com.au>
Date: Mon, 8 Jan 2001 21:52:33 +1100
Subject: [vsnet-chat 3954] BL Tel 2000 Eclipse Summary

Dear All,

Results of visual observations of the recent BL Tel eclipse have now been
submitted to the Publications of the VSS RASNZ.  Based on 225 visual
observations by 11 Australian observers, this eclipse can be summarised as
follows :

GJD 		2000(UT)	Remark
2400000+
51776.5		Aug   20.0	Eclipse commenced
51809.5		Sept  22.0	Minimum brightness reached
51812.5		Sept  25.0	Mid eclipse
51815.5		Sept  28.0	Minimum ends
51844.5		Oct   27.0	Eclipse ended

The above indicates an overall duration of 68.0 days and 6 days of constant
brightness at minimum suggests this eclipse was total.  The date of mid
eclipse is 778.0 days since that of the previously observed eclipse. 
Minimum brightness was 9.6v giving an amplitude 2.5 magnitudes.

Based on these dates, the next eclipse of BL tel will be centered near 2002
November 11 which will unfortunately place it near conjunction with the
Sun.

Following is a progressive Table of results for BL Tel eclipses observed by
members of the VSS RASNZ.


O-C and Summary of BL Tel eclipses 1983-2000, from visual data by VSS,
RASNZ according to elements JD 2434692 +778.1 days

Year	Observed	Calculated	O-C	Mag.	Duration	Interval
						(v)	days		days
1983	2445591.5	2445586.0	+4.5	8.60	57.0 		-
1985	2446369.5	2446364.1	+5.4	9.60	65.0		778.0
1987	2447144.5	2447142.2	+2.3	9.30	63.0		775.0
1992	2448703.0	2448698.4	+4.6	9.20	58.0		(1558.5)
1994	2449481.0	2449476.5	+4.5  10.10	62.0		778.0
1996	2450256.0	2450254.6	+1.4	8.90	65.0		775.0
1998	2451034.5	2451032.1	+2.4	8.96	56.0		778.5
2000	2451812.5	2451810.2	+2.3	9.60	68.0		778.0


Trust this is of interest.

Regards

Peter Williams
Heathcote NSW

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