You can look in Wikipedia for the list of astronomers between Hipparchus and Ptolemy,
or for more detail consult Neugebauer. (Or Ptolemy himself:-)
The problem is that 90% of our knowledge about astronomy before Ptolemy (except Babylonian
for which we have an independent source) is based
on Ptolemy books, and this is not an exaggeration. An evidence of this is
Neugebauer's History of Ancient Mathematical astronomy. The first volume is an analysis of Ptolemy, the second of EVERYTHING else (Including Hipparchus, Babylonians, Egyptians,
and everything in between), and the 3-d volume is Appendixes, tables plates etc.
EDIT. Wikipedia lists the following astronomers in the period between Hipparchus and Ptolemy: Aglaonice, Agrippa, Andronicus of Cyrrhus, Hypcicles, Geminus, Menelaus and Theon of Smyrna (these two are contemporaries of Ptolemy), Posidonius, Seleucus of Seleucia,
Theodosius of Bythinia.
Of these, Ptolemy mentions: Agrippa, Theon of Smyrna and Menelaus. One book of Geminus still exists. All others are just mentioned somewhere in other sources.
EDIT 2. There is no consensus about Russo's speculations. The fact is that most of the Greek pre-Ptolemy astronomy is lost. (Including almost everything that Hipparchus wrote. Only one minor work of Hipparchus survives.) I am inclined to think that Russo is right in his general conclusions.