UCAC4.cross_ref_tycho¶
- UCAC4.cross_ref_tycho(ucac_labels, tycho_cat=None)[source]¶
This retrieves the Tycho 2 catalogue records for the requested UCAC4 star Zone, RNZ values.
- Parameters
tycho_cat (Optional[giant.catalogues.tycho.Tycho2]) – The tycho catalogue instance to use. If None, a default instance will be created
ucac_labels (Union[Sequence, numpy.ndarray]) – The UCAC 4 labels as an iterable of Zone, RNZ pairs
- Returns
The raw Tycho 2 star records.
- Return type
pandas.core.frame.DataFrame