Phys

class sbpy.data.Phys[source]

Bases: sbpy.data.DataClass

Class for storing and querying physical properties

Methods Summary

from_jplspec(temp_estimate, transition_freq, …)

Returns relevant constants from JPLSpec catalog and energy calculations

from_sbdb(targetids[, references, notes])

Load physical properties from JPL Small-Body Database (SBDB) using jplsbdb for one or more targets.Builds a Phys object from the output of 'phys_par' from SBDB.Units are applied, where available.Missing data are filled up as nan values.Note that SBDB only serves physical properties data for a limited number of objects..

Methods Documentation

classmethod from_jplspec(temp_estimate, transition_freq, mol_tag)[source]

Returns relevant constants from JPLSpec catalog and energy calculations

Parameters
temp_estimateQuantity

Estimated temperature in Kelvins

transition_freqQuantity

Transition frequency in MHz

mol_tagint or str

Molecule identifier. Make sure it is an exclusive identifier, although this function can take a regex as your molecule tag, it will return an error if there is ambiguity on what the molecule of interest is. The function query_lines_async with the option parse_name_locally=True can be used to parse for the exclusive identifier of a molecule you might be interested in. For more information, visit astroquery.jplspec documentation.

Returns
Molecular dataPhys instance
Quantities in the following order from JPL Spectral Molecular Catalog:
Transition frequency
Temperature
Integrated line intensity at 300 K
Partition function at 300 K
Partition function at designated temperature
Upper state degeneracy
Upper level energy in Joules
Lower level energy in Joules
Degrees of freedom
classmethod from_sbdb(targetids, references=False, notes=False)[source]

Load physical properties from JPL Small-Body Database (SBDB) using jplsbdb for one or more targets. Builds a Phys object from the output of 'phys_par' from SBDB. Units are applied, where available. Missing data are filled up as nan values. Note that SBDB only serves physical properties data for a limited number of objects.

Parameters
targetidsstr, int or iterable thereof

Target identifier(s) to be queried; use object numbers, names, or designations as unambiguous as possible.

Returns
Phys object

Examples

>>> from sbpy.data import Phys
>>> phys = Phys.from_sbdb(['Ceres', '12893', '3552']) # doctest: +REMOTE_DATA
>>> print(phys['targetname', 'H', 'diameter'])  # doctest: +SKIP
        targetname                 H          diameter
                                  mag            km
-------------------------- ------------------ --------
                   1 Ceres               3.34    939.4
 12893 Mommert (1998 QS55)               13.9    5.214
3552 Don Quixote (1983 SA) 12.800000000000002     19.0