IC 3476 image:
References:
IC 3476 (Sinbad),
IC 3476 (NED):
v_radial = -169(5) km/s,
Distance = 13.100 Mpc,
Angular Size = 2.1' x 1.8':
Your Type = ____________ ,
Ref. Type = ____________ ,
Right/Wrong (R/W) = ____________ .
Answer:
IB(s)m:
an irregular galaxy, barred, no ring, highly irregular.
This galaxy just looks like a
blue spiral to me and NOT very irregular,
but what do I know
IB is NOT among the standard designations that I can find for the
de Vaucouleur system.
IC 3538 image:
References:
IC 3583 (Sinbad),
IC 3583 (NED):
Angular Size = 2.5' x 1.5',
v_radial = 1121(7) km/s,
Distance = 11.141 Mpc:
Your Type = ____________ ,
Ref. Type = ____________ ,
R/W = ____________ .
Answer:
SmIII:
spiral galaxy, bulgeless, irregular,
and I don't know what for is the III thing.
NGC 4413 image:
References:
NGC 4413 (Sinbad),
NGC 4413 (NED):
v_radial = 102(6) km/s,
Distance = 5.92 Mpc,
Angular Size = 2.3' x 1.5':
Your Type = ____________ ,
Ref. Type = ____________ ,
R/W = ____________ .
Answer:
SB(rs)ab:
a barred spiral transitional
between ring and no ring, transitional between a and b.
Sinbad calls it a 5 D---what the heck.
NGC 4416 image:
References:
NGC 4416 (Sinbad),
NGC 4416 (NED):
v_radial = 1390(2) km/s,
Distance = 23.7 Mpc,
Angular Size = 1.7' x 1.5':
Your Type = ____________ ,
Ref. Type = ____________ ,
R/W = ____________ .
Answer:
SB(rs)cd?:
A barred spiral transitional
between ring and no ring, transitional between c and d.
Sinbad calls it a 7 D---what the heck.
The distances actually are usually uncertain by of about 10 %, and so I have quote
more than significant figures
just following the NED custom for
consistency.
For the angular size data,
I have rounded off to the nearest 0.1' or 0.01'.
The angular size data are written (major axis) x (minor axis).