Re: Stars in daylight

On Wed, 19 Dec 2007 20:07:43 -0800 (PST), canopus56
<canopus56@xxxxxxxxx> wrote:

Weaver concluded that no stars are visible to the unaided eye during
daytime. A recent notable exception was Comet McNaught C/2006 P1 that
peaked at a magnitude -5.1 on Jan. 14 of this years. The magnitude of
Venus around maximum elongation is about -4.1. Garstang noted that
the two brightest: Sirius and Canopus can be seen with the naked eye
20 minutes before and at sunset, respectively.

I saw Sirius about an hour before noon, when it was around 40° from the
Sun. That is, mag=-1.4, alpha=60°, beta=40°. That's about two mags
dimmer than the table suggests. It was hard to find, but not hard to see
as long as I didn't move my eye away (which is actually difficult to
avoid).

This was from over 9000 feet in elevation, so that probably makes things
easier.

_________________________________________________

Chris L Peterson
Cloudbait Observatory
http://www.cloudbait.com
.

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