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[vsnet-chat 3720] RE: [AAVSO-DIS] Delta Velorum next eclipses
- Date: Sun, 15 Oct 2000 01:44:57 -0300
- To: "Stan Walker" <astroman@voyager.co.nz>, <vsnet-chat@kusastro.kyoto-u.ac.jp>
- From: Sebasti若n Otero <varsao@fullzero.com.ar>
- Subject: [vsnet-chat 3720] RE: [AAVSO-DIS] Delta Velorum next eclipses
- References: <01b801c03496$5df5c320$70d3fea9@s8y0g5> <003c01c034d6$e218dda0$14c7fea9@s8y0g5> <001401c03637$40cdbc60$58116ecb@star>
- Sender: owner-vsnet-chat@kusastro.kyoto-u.ac.jp
Based on preliminary data from Galileo, kindly forwarded by mission
engineer Paul Fieseler (JPL, NASA), I prepared an ephemeris based on the
probable "darkest moments" of the eclipse. Since Galileo doesn't properly
measure the star but only gives a rough idea that the star is dimmer, we can not
call the 8 hour (0.33 days) event the true eclipse.
Furthermore, it seems that in 1989 another event took place (in a random
time according to our predictions) and lasted about 21 hours!!! I don't
trust in these observations however. They can only be used as a guidance.
The times of my observations are just the MOMENTS WHEN I STARTED AND
STOPPED OBSERVING THAT NIGHT. They are not times of ingress or egress. I used
them just to stress that they are within the time predicted for the
eclipse.
Again:
> JD - Begin predicted - End predicted -
>
Observed from--to -
>
Observation by
>
>
2448805.72
2448806.06
> 2448806.0531----
> HIPPARCOS
>
>
2450631.25
2450631.58
> 2450631.4375----2450631.5417
> My visual
observations
>
>
2450831.47
2450831.80
> 2450831.6409----2450831.7688
> My visual
observations
>
>
2451308.45
2451308.78
> 2451308.4618----2451308.7014
> My visual
observations
>
>
2451714.77
2451715.10
> 2451714.77--------2451715.10
> GALILEO
So the duration of the whole event is unknown but it seems that the deepest
phase happens at the predicted times.
Good luck the following weeks. I will not be able to do anything
tonight!! :-(
Sebastian.
I'm
not clear from your comments just what your visual eclipse duration
is.
Does it agree with the other measures? You seem to have derived a
length of
about 0.33 but you refer to the deepest part so I'm unsure
whether that
includes ingress and egress. Anyway, the eclipse seems
unobservable from
here at the moment but I might try to get a few snapshots
on clear mornings.
Regards,
Stan
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