Physical Information:
PGC 66528: LEDA B 15.65; NED Sa? pec, 3K Vr 10597 km/sec, z 0.0353473937776
PGC 66529: LEDA Sa?M, B 15.05, I 12.77, 3K Vr 11014 km/sec; NED S0? pec, 3K Vr 10817 km/sec, z 0.03519463247
ESO 464-031: LEDA 3K Vr 6262 km/sec (obviously something wrong); NED repeats info for PGC 66528
It is obvious that there is something wrong about the LEDA magnitudes, as 66528 is considerably brighter than 66529. NED lists both at mag 15, with no bandwidth, so better, but still wrong; need to see if there is any better reference
This pair of galaxies is among those in the
Arp-Madore Catalogue of Southern Peculiar Galaxies & Associations, and is listed as a member of Category 2: Interacting Doubles in an
ASCII file that adds "Insteracting Double with Material," but there is no image of the pair in the Catalogue, and it is not included in the supposedly complete list of objects that are in the Catalogue.
Classification Note: This incomplete entry uses the classifications from LEDA/NED. The completed entry will include alterations based on the HST image of the pair.
Note About Classification: The type is taken from the
Spitzer Survey of Stellar Structure in Galaxies. The colon after the "
d" means that the classification is uncertain, partly because it's a "spindle" (an "edge-on" galaxy), as indicated by "sp". The "/ E(d)7-8" means that the galaxy is surrounded by a faint disklike elliptical extension, but "true" ellipticals rarely go beyond class E4 or 5, and in any case, the existence of that outer region does not change the fact that the galaxy is a spiral.
