What are the dangers with Deriving the Hubble Constant using galxies within the Local(Virgo) Cluster?

Question

Looking for how supper clusters affect the Hubble Diagram

Answer 1

First of all, the sample size is very small, secondly it represents only objects in one direction of the sky and the cluster is so close that the result may be only representative of local expansion rates. Last and not least, the cluster is gravitationally bound and some of the motion of the individual galaxies can be significantly influenced heavily by local gravitational effects.

Answer 2

The hubble constantis relied on to gauge the distance to large structures at extreme distances.
Pulsars are used as a reference, The local virgo cluster is fairly close and would magnify any errors of distance.
The iniverse is a finite entity so one must question the iterpretation of the hubble constant that tells us that the universe is expanding at an accelerated rate,Ancient pulsars could vary cosiderably from more contemporary ones.
If the space telescope looked at a large structure with a 50% error of distance the red shift could be interpreted as expanding and accelerating.
If the large structure had no net recessional velocity but was collapsing to a central point if an error of uncertainty prevented you from recognising the near side from the far side the red shift would indicate that the near side was farther away and the far side was closer.
The red shift from the far side would be shifted less than the red shift from the near.
The interpretation would be that the large structure was accelerating away from us .The near side seeming to be farther away with greater velocity!