[vsnet-ecl 203] (fwd) Eclispe of Variable HDE331015 (PC12)=V871 Ara

[Taichi Kato <tkato>]

(fwd) Eclispe of Variable HDE331015 (PC12)=V871 Ara

Re HDE331015 = V871 Ara = C12

Following is copy text from an earlier message to Col Bembrick (Mt Tarana,
NSW) who has been observing V871 Ara with CCD to monitor eclipses and
search for the secondary eclipse.

I understand the next eclipse should occur on Sunday evening, August 06
AEST (August 05 GMAT).

quote
===============================================

Re the dates of mid eclipse for HDE331015, based on my ephemeris od
2450311.9775 +9.4169895, it would appear the following are likely times
(but this may depend upon upon how many decimals are on the calculator
used??):

JD2541000+      GMAT            AEST (+0.9166d)

668.0239        May 03.0239     May 03.9405     =       03d 22h 34m
696.2748        May 31.2748     June 01.1914    =       01d 04h 35m     zzzzzzzz
715.1088        June 19.1088    June 20.0256    =       20d 00h 36m
733.9426        July 07.9426    July 08.8596    =       08d 20h 37m
762.1937        Aug 05.1937     Aug 06.1103     =       06d 02h 38m

Lines 1 and 3 thru 5 would seem reasonable times.  As eclipse duration is
near 7.7 hours, sevreal of these may need be observed to obtain a complete
phase plot light curve.  I this I will definately be asleep for line 2.
=========================================================
unquote.

We have observed several of the eclipses listed above.  HDE331015 becane
V871 Ara in the 75th Name List based on our visual results summary posted
to the vsnet.

Regards to all,

Peter Williams
Heathcote NSW

----------
From: lizard1@telstra.easymail.com.au
Subject: Eclispe of Variable HDE331015 (PC12)
Date: Saturday, August 05, 2000 7:55

Eclispe of Variable star HDE331015 (PC12)

This Variable I discovered in 1991, Peter Williams and others later
observed this star to be an Algol  type eclisping system. it will under go
eclispe tonight at 16h 32m UT mid eclispe.

I would be intested in receiving some observations, below are details:.

GJD 2450 311.9775 +/-9.4169895E

Mean Maximum Mag.       11.0v
Mean Minimum  Mag.      13.4v
Amplitude of Variation  2.4v
Duration of eclipse.            7.73 hours (0.32days)
Duration of total eclipse       1.2 hours

Also I have observed Delta Sco on Aug 3.375ut  1.8v.

Regards Paul Camilleri

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