AFlags

class daschlab.photometry.AFlags(value)

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