Declension table of ?upanakṣatra

Neuter	Singular	Dual	Plural
Nominative	upanakṣatram	upanakṣatre	upanakṣatrāṇi
Vocative	upanakṣatra	upanakṣatre	upanakṣatrāṇi
Accusative	upanakṣatram	upanakṣatre	upanakṣatrāṇi
Instrumental	upanakṣatreṇa	upanakṣatrābhyām	upanakṣatraiḥ
Dative	upanakṣatrāya	upanakṣatrābhyām	upanakṣatrebhyaḥ
Ablative	upanakṣatrāt	upanakṣatrābhyām	upanakṣatrebhyaḥ
Genitive	upanakṣatrasya	upanakṣatrayoḥ	upanakṣatrāṇām
Locative	upanakṣatre	upanakṣatrayoḥ	upanakṣatreṣu

Compound upanakṣatra -

Adverb -upanakṣatram -upanakṣatrāt