<s>
The	O
NASA/IPAC	B-Application
Extragalactic	I-Application
Database	I-Application
(	O
NED	O
)	O
is	O
an	O
online	O
astronomical	O
database	O
for	O
astronomers	O
that	O
collates	O
and	O
cross-correlates	O
astronomical	O
information	O
on	O
extragalactic	O
objects	O
(	O
galaxies	O
,	O
quasars	O
,	O
radio	O
,	O
x-ray	O
and	O
infrared	O
sources	O
,	O
etc	O
.	O
)	O
.	O
</s>
<s>
NED	O
is	O
built	O
around	O
a	O
master	O
list	O
of	O
extragalactic	O
objects	O
for	O
which	O
cross-identifications	O
of	O
names	O
have	O
been	O
established	O
,	O
accurate	O
positions	O
and	O
redshifts	B-Application
entered	O
to	O
the	O
extent	O
possible	O
,	O
and	O
some	O
basic	O
data	O
collected	O
.	O
</s>
<s>
Detailed	O
and	O
referenced	O
photometry	O
,	O
position	O
,	O
and	O
redshift	B-Application
data	O
,	O
have	O
been	O
taken	O
from	O
large	O
compilations	O
and	O
from	O
the	O
literature	O
.	O
</s>
<s>
As	O
of	O
March	O
2014	O
,	O
NED	O
contains	O
206	O
million	O
distinct	O
astronomical	O
objects	O
with	O
232	O
million	O
cross-identifications	O
across	O
multiple	O
wavelengths	O
,	O
with	O
redshift	B-Application
measurements	O
for	O
5	O
million	O
objects	O
,	O
1.9	O
billion	O
photometric	O
data	O
points	O
,	O
609	O
million	O
diameter	O
measurements	O
,	O
71	O
thousand	O
redshift-independent	O
distances	O
for	O
over	O
15	O
thousand	O
galaxies	O
,	O
310	O
thousand	O
detailed	O
classifications	O
for	O
230	O
thousand	O
objects	O
,	O
and	O
2.6	O
million	O
images	O
,	O
maps	O
and	O
external	O
links	O
,	O
together	O
with	O
links	O
to	O
65	O
thousand	O
journal	O
articles	O
,	O
notes	O
and	O
abstracts	O
.	O
</s>
