The
Million Quasars (Milliquas) v8 catalog -- Final
Edition -- 2023,OJAp,6,49
MILLIQUAS v8 includes quasars from the literature
to 30 June 2023, including quasars from the DESI-EDR
and SDSS-DR18Q. This edition includes 907K
type-I QSOs & AGN, plus blazars and type-II objects and 66K radio/X-ray associated QSO candidates of pQSO=99%, for
a total count of 1,021,800 -- details are in the ReadMe. Gaia-EDR3 astrometry is
given for ~60% of the objects, as available. This
is the final edition of Milliquas -- published by the Open Journal of
Astrophysics -- 2023,OJAp,6,49 -- https://doi.org/10.21105/astro.2308.01505.
Here is the
ReadMe,
and a quick
browse of sample data (in flat text form) is here.
GET MILLIQUAS v8 HERE (31 MB zipped). Also
available in FITS
(40 MB zipped). Or get them from CDS here
(select FTP tab).
Citations in Milliquas are indexed in the file
"milliquas-references.txt" here.
Get
the paper here
(vanilla style) or on arXiv
or on OJAp.
A previous paper, for Milliquas v7.2, is here
and also on arXiv
-- it details the ingestion of SDSS quasars up through DR16Q, including
677 high-z (z>3.5) left out of DR16Q.
My paper 2021,MNRAS,504,621
described elusive issues in SDSS-DR16Q, and presented 40 new quasars
salvaged out of the pipeline SDSS data; see it on MNRAS or arXiv.
An early paper 2013,PASA,30,4 itemized hundreds
of fixes of legacy quasar positions; see it here
or on arXiv or ADS
(avoid PASA version due to poor typesetting).
A series of
newsgroup postings -- "Tales of Cataloguing" -- informally recounted
some of my fixes of legacy quasar positions; a selection is here.
Quasar Candidates: Milliquas
used to be published with many more radio/X-ray associated optical
candidates over the whole sky -- these are now presented by the MORX
v2 catalog (2024,OJAp,7,6 -- https://doi.org/10.21105/astro.2308.01507) which consists of
3,115,575 radio/X-ray associated quasars, galaxies, stars, and
unclassifieds with > 500K high-probability quasar candidates.
Paper for MORXv2 is here or
on arXiv
.
MORX
v2 is HERE
(143 MB zipped). Also available in FITS (168 MB zipped). Or get them from CDS here
(select FTP tab).
MORX
ReadMe is here
. Index to MORX citations is here
.
Eric Flesch, last
updated 14 August 2025