AFlags

class daschlab.lightcurves.AFlags(value)[source]

Bases: IntFlag

DASCH photometry data quality warning flags.

The “AFLAGS” value is an integer where each bit indicates a data quality concern. The highest-quality data have no bits set, i.e., an integer value of zero.

Flag documentation is intentionally superficial. Flag semantics are (FIXME: will be) documented more thoroughly in the DASCH data description pages.

Attributes Summary

BAD_PLATE_QUALITY

Bit 8: Plate fails general quality checks

BIN_DRAD_UNKNOWN

Bit 16: Object's spatial bin has unmeasured drad

CASE_BC_BLEND

Bit 23: "Case B/C" blend - multiple catalog entries and imaged stars all mixed up

CASE_B_BLEND

Bit 21: "Case B" blend - multiple catalog entries for one imaged star

CASE_C_BLEND

Bit 22: "Case C" blend - mutiple imaged stars for one catalog entry

CLOSE_TO_LIMITING

Bit 14: Object brightness is too close to the local limiting magnitude

HIGH_BACKGROUND

Bit 7: High SExtractor background level at object position

LARGE_DRAD

Bit 24: Object drad is large relative to its bin, or its spatial or local bin is bad

LARGE_ISO_RMS

Bit 12: SExtractor isophotonic RMS is suspiciously large

LARGE_LOCAL_SMOOTH_RMS

Bit 13: Local-binning RMS is suspiciously large

LARGE_SMOOTHING_CORRECTION

Bit 29: Smoothing correction is suspiciously large

LOW_ALTITUDE

Bit 31: Low altitude - object is within 23.5 deg of the horizon

MULT_EXP_BLEND

Bit 11: Object is a blend and this is a multiple-exposure plate

MULT_EXP_UNMATCHED

Bit 9: Object is unmatched and this is a multiple-exposure plate

PICKERING_WEDGE

Bit 25: Object is a Pickering Wedge image

RADIAL_BIN_9

Bit 15: Object is in radial bin 9 (close to the plate edge)

REJECTED_BLEND

Bit 28: Rejected blended object

SUSPECTED_DEFECT

Bit 26: Object is a suspected plate defect

SXT_BLEND

Bit 27: SExtractor flags the object as a blend

TOO_BRIGHT

Bit 30: Object is too bright for accurate calibration

UNCERTAIN_CATALOG_MAG

Bit 20: Magnitude of the catalog source is uncertain/variable

UNCERTAIN_DATE

Bit 10: Observation time is too uncertain to calculate extinction accurately

Attributes Documentation

BAD_PLATE_QUALITY = 128

Bit 8: Plate fails general quality checks

BIN_DRAD_UNKNOWN = 32768

Bit 16: Object’s spatial bin has unmeasured drad

CASE_BC_BLEND = 4194304

Bit 23: “Case B/C” blend - multiple catalog entries and imaged stars all mixed up

CASE_B_BLEND = 1048576

Bit 21: “Case B” blend - multiple catalog entries for one imaged star

CASE_C_BLEND = 2097152

Bit 22: “Case C” blend - mutiple imaged stars for one catalog entry

CLOSE_TO_LIMITING = 8192

Bit 14: Object brightness is too close to the local limiting magnitude

HIGH_BACKGROUND = 64

Bit 7: High SExtractor background level at object position

LARGE_DRAD = 8388608

Bit 24: Object drad is large relative to its bin, or its spatial or local bin is bad

LARGE_ISO_RMS = 2048

Bit 12: SExtractor isophotonic RMS is suspiciously large

LARGE_LOCAL_SMOOTH_RMS = 4096

Bit 13: Local-binning RMS is suspiciously large

LARGE_SMOOTHING_CORRECTION = 268435456

Bit 29: Smoothing correction is suspiciously large

LOW_ALTITUDE = 1073741824

Bit 31: Low altitude - object is within 23.5 deg of the horizon

MULT_EXP_BLEND = 1024

Bit 11: Object is a blend and this is a multiple-exposure plate

MULT_EXP_UNMATCHED = 256

Bit 9: Object is unmatched and this is a multiple-exposure plate

PICKERING_WEDGE = 16777216

Bit 25: Object is a Pickering Wedge image

RADIAL_BIN_9 = 16384

Bit 15: Object is in radial bin 9 (close to the plate edge)

REJECTED_BLEND = 134217728

Bit 28: Rejected blended object

SUSPECTED_DEFECT = 33554432

Bit 26: Object is a suspected plate defect

SXT_BLEND = 67108864

Bit 27: SExtractor flags the object as a blend

TOO_BRIGHT = 536870912

Bit 30: Object is too bright for accurate calibration

UNCERTAIN_CATALOG_MAG = 524288

Bit 20: Magnitude of the catalog source is uncertain/variable

UNCERTAIN_DATE = 512

Bit 10: Observation time is too uncertain to calculate extinction accurately