[vsnet-chat 4222] Re: Guide 7 data error

[Fraser Farrell <fraser@trilobytes.com.au>]

>> GUIDE 7 therefore is in error in not displaying the star at RA 5h 56m 29s,
>> Dec -11d 16' 34".
>
>   This is probably because of the omission of the star from GSC and Tycho
>(the star is present in Tycho-2).

[edited]

>055628.2 -111638 (2000.0) SAO150958 99.9 8.0 K2
>055628.6 -111608 (2000.0) HD40120 8.0 9.1 K2

Guide version 6 also doesn't display this 7th-mag star - but
it will go to its coordinates via those SAO and HD
designations. I've noticed a few other instances of these
"invisible" HD stars from time to time, but all were
associated with nebulae or dense clusters. Places where an
automated plate scanner would be expected to have problems.

Guide shows a ~10' diameter semicircle of 14th & 15th mag
GSC stars centred on this position. Are these actually a
7th-mag star image which happened to fall on a plate defect?

And, scoring a point for the Old Technology, Becvar's "Atlas
Eclipticalis" 1964 edition _does_ show this star.


cheers,
Fraser Farrell

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