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All-Sky Optical catalogue now available for download
My publications are coming to an end, methinks, but throughout I was
using a homegrown version of an all-sky optical catalogue, the likes of which seem strangely missing from availability nowadays. Once upon a time the USNO-B was distributed in Linux, so it was said -- no evidence of that today, and you can't download the USNO-B today. In the late 1990's the USNO-A was distributed on 10-12 CDs in a limited edition -- I've still got mine, but it's vanished elsewhere. And the APM was "distributed" on tape -- how old does that sound -- but occasionally parts of it would pop up on web sites -- and I said "pretty please" to AAO to put some of it on theirs -- and so I got the whole thing 16 years ago. Today we have SDSS and SuperCosmos which are terabytes large -- good luck with that. So I detected a need, and have built an all-sky optical catalogue from USNO-B, USNO-A, APM and SDSS optical data, it is 1.16 billion objects in a sparse format which is stored at a mere 9Gb. It's been accepted by PASA and is now on arXiv at https://arxiv.org/abs/1705.05434 So if you would like to have your very own all-sky optical catalogue on your own computer, you can now have one. Hope you like it. As for me, I think I'm done now but you never know for sure. It seems likely that I'll be issuing a new Milliquas ("million quasars") catalogue on NASA HEASARC in July when SDSS DR14 comes out, so I may be around for a while yet. cheers, Eric Flesch Whakatane, New Zealand 17-May-17 |
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