The earth since it’s between Venus and Mars

Saturn because it has a ring and that’s cool

The asteroid 2063 Bacchus because IIRC Bacchus (Dionysus)'s tales have some themes of gender non-conformity. But in a more serious tone, the Hellenistic mythologies used to have some gender non-binary figures such as the statues of Aphroditus, but the Latin-speaking Italian Romans generally took gender roles very seriously even before Christianisation, so you’ll probably have to find some non-Latin astronomical object.

Alpha Centauri maybe?

Thought to be a single star by the Greeks, but are a collection of many different stars in reality.