|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
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 |
#2
|
|||
|
|||
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
|
|||
|
|||
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. |
#5
|
|||
|
|||
All-Sky Optical catalogue now available for download
On Fri, 16 Jun 2017, Steve Willner wrote:
(Eric Flesch) writes: My statement pertains to obtaining the entire 80Gb catalog. ...using the Vizier query but I expect you'd run afoul of some system limit. I'm not aware of any Vizier query limits. Disk space and bandwidth may be practical limits in some cases, but I wouldn't expect them to be a problem for 80 GB. (You meant GB, not Gb, didn't you?) I've recently downloaded Simbad quasars using the Vizier query and there was a 20,000 row download limit per each query. Given that USNO-B has over a billion rows, that comes to 50,000 queries required. I suspect that even you would find that to be a limit, Steve. :-) |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
Tales of Cataloguing X -- the Optical VCV Catalogue | Eric Flesch | Research | 0 | August 6th 14 01:59 PM |
Optical SETI and optical beacons | Rob Dekker | SETI | 8 | May 24th 04 11:24 PM |
Star Catalogue | Michael Barlow | Amateur Astronomy | 18 | January 26th 04 08:46 PM |
Sky Charts catalogue help | Ian Neill | UK Astronomy | 2 | September 27th 03 11:44 AM |
Star Catalogue | KnowItAll | UK Astronomy | 1 | September 22nd 03 08:32 PM |