[vsnet-chat 3720] RE: [AAVSO-DIS] Delta Velorum next eclipses

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

[vsnet-chat 3720] RE: [AAVSO-DIS] Delta Velorum next eclipses

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