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[vsnet-ecl 775] Eta Geminorum eclipse in progress
- Date: Wed, 4 Dec 2002 11:18:45 -0300
- To: <vsnet-ecl@ooruri.kusastro.kyoto-u.ac.jp>, <vsnet-chat@kusastro.kyoto-u.ac.jp>
- From: "Sebastian Otero" <varsao@fullzero.com.ar>
- Subject: [vsnet-ecl 775] Eta Geminorum eclipse in progress
- Cc: "teresa hernandez" <teremhernandez@hotmail.com>, "Sebastian Otero" <varsao@fullzero.com.ar>, "paula Pietranera" <ppietranera@hotmail.com>, "Marcelo" <marcelomale@yahoo.com>, "Leonardo Sinamon" <lgs_73@hotmail.com>, "Lelia" <leliafo@yahoo.com.ar>, "Gabriel Giust" <gag@sinectis.com.ar>, "Flia Maudet" <fliamaudet@infovia.com.ar>, "Federico Claus" <nclaus@infovia.com.ar>, "Conrado Federico Kurtz" <surastronomico@hotmail.com>, "Cecilia" <cecimacros@yahoo.com.ar>, "carlos antonio lopez" <cartopez@yahoo.com>, "BED" <enzodb@fullzero.com.ar>, "Astrid Behrens" <astridbeh@arnet.com.ar>
- Sender: owner-vsnet-ecl@ooruri.kusastro.kyoto-u.ac.jp
Dear colleagues,
Although the current fading of eta Geminorum seems to be in phase with the
semiregular pulsation cycle, a close look to the ephemeris makes the
difference. We are probably seeing the descending branch of one of the very
strange eclipses of this long period system (2983-2984 days). I couldn't
find accurate elements, but the GCVS epoch is JD 2437725 and this means
minimum will occur somwhere between JD 2452640 and 645.(December 31-January
4).
Eclipse duration is 5% of the period, which means 74-75 days. This is
exactly when my first point of the season was collected and since then the
fading trend is apparent.
I think it would be interesting trying to see the features of the eclipse
light curve, specially in order to identify the combination of both the SR
and the EA behaviour.
I have uploaded a lightcurve at:
Best regards,
Sebastian.
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