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.
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.