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All-Sky Optical catalogue now available for download



 
 
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  #1  
Old May 17th 17, 05:27 AM posted to sci.astro.research
Eric Flesch
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Posts: 290
Default 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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  #2  
Old May 19th 17, 05:36 PM posted to sci.astro.research
Steve Willner
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Posts: 1,102
Default All-Sky Optical catalogue now available for download

In article ,
(Eric Flesch) writes:
... you can't download the USNO-B today.


I'm surprised it's not at VizieR. What is
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=I/284 ?

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


That's still quite a useful catalog.

--
Help keep our newsgroup healthy; please don't feed the trolls.
Steve Willner Phone 617-495-7123
Cambridge, MA 02138 USA
  #3  
Old May 20th 17, 06:34 PM posted to sci.astro.research
Eric Flesch
external usenet poster
 
Posts: 290
Default All-Sky Optical catalogue now available for download

On Fri, 19 May 2017, Steve Willner wrote:
(Eric Flesch) writes:
... you can't download the USNO-B today.


I'm surprised it's not at VizieR. What is
http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=I/284 ?


That's an on-line query form for USNO-B data. My statement pertains
to obtaining the entire 80Gb catalog. You're welcome to try that
using the Vizier query but I expect you'd run afoul of some system
limit.

 




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