This is part 2 of anomalies I've encountered in cleaning QSO data.
99 44/100 % is fine. This is the story of the remaining 0.56%.

The task in producing the "million quasars" catalog is to find the
right optical object for each quasar. If the data positions a
brightish quasar but I find no optical object there, then I must
search for it. Any feedback welcome.

Section A: When Veron 13th edition and NED disagree, Veron usually
wins because of the careful attention of its authors. But not always,
and following are 5 cases of mixed outcomes.

1) HE 0435-1223 (this old notation describes a B1950 tile of sky):
a Cyril Hazard quasar -- he rarely published positions for these.
Veron positions this at J043814.8-122314, NED has J043814.8-121715.
NED is right -- Veron failed to convert the declination from B1950 to
J2000.

2) IXO 40: Veron positions this at J115057.9-290043 but there is
nothing there. NED has J115057.9-284402, which is right. Veron was
off by exactly 1000 arcsec in declination, indicating a transcription
error.

3) NGC 2859 U2, a Halton Arp quasar. Veron positions this at
J092457.8+343952, in the middle of nowhere. NED has J092557.6+343950
which is correct. Veron has a transcription error of 1 time minute =
about 900 arcsec. However, NED also has a "NGC 2859 U02" at the bogus
location, so NED has a duplicate here.

4) NGC 2859 U3, much like (3), above. Veron has J092454.2+341648
which is off by 1 time minute. NED has J092554.0+341645 which is
correct, but also has "NGC 2859 U03" at the bogus location, thus,
again, a duplicate.

5) SBS 1014+565, a Soviet quasar: Veron correctly has this at
J101724.4+562108. SDSS-DR7 re-surveyed this at the Veron location but
erroneously called it "SBS 1014+566". NED has had SBS 1014+565 at the
bogus location of J101715.0+561811 (not sure why), and has added the
bogus-named "SBS 1014+566" at the true location given by SDSS-DR7, so
NED has a duplicate here.

Section B: bright Soviet quasars from Afanasjev et al,1979AN,300,31.
This paper published 4 quasars, one of which, TB 0933+733, z=2.525,
had a finding chart. A pity they didn't all have one, for 3 anomalies
follow. (TB=Tautenburg objective prism survey, H. Lorenz)

1) TB 0748+611, z=2.492 v=17.5 is in NED as [HB89] 0747+613 at
J075212.0+611223. However, that optical object is v=20.0 and at
B074750.1+612006 is in 0747+613, not 0748+611. Investigation finds
this object listed in Veron & NED as SBS 0747+611, z=2.487 v=17.2 at
B074801.9+610537, ie J075222.6+605753. So the NED object [HB89]
0747+613 is duplicate. I will restore the original name TB 0748+611
in the next edition of the million quasars catalog.

2) TB 0948+722, v=17.5, z=0.529: Veron says J095224.6+715755 but this
is only the centre of a 400-arcsec square tile of sky. I found this
quasar at J095254.2+715803, 171 arcsec from the nominal location. It
is an in-your-face v=17.2 quasar with X-ray 2RXP J095255.1+715758.

3) TB 0958+735, v=17.5, z=2.067: Veron says J100225.4+731532, but as
with (2) this is only approximate. This is again an in-your-face
v=17.1 quasar at J100317.6+731559 at 180 arcsec from the nominal
location. It has X-ray 1RXS J100317.6+731558 and radio NVSS
J100318.7+731558.

More to come, Eric Flesch