urn:nasa:pds:uranus_occ_support:document:uranus_ringocc_bundles_quality_rating
1.0
Uranus Ring Occultation Quality Assessment
1.14.0.0
Product_Document
French, Richard G.; McGhee-French, Colleen A.; Gordon, Mitchell K.
2020
uranus occultation quality
Table of the team's assessment of the quality of the data for each ring in each Uranus Occultation data bundle.
2020-12-08
1.0
Initial version
urn:nasa:pds:uranus_occ_support:document:earth-based-uranus-stellar-occultations-user-guide
document_to_associate
The User Guide for Earth-based Uranus Stellar Occultations.
Uranus Ring Occultation Quality Index Table
M. K. Gordon
2020-12-15
1
A CSV table of values provides a convenient summary of the entire set of ring occultation
bundles, identifying which rings were detected in each observation, the quality index QI for each observed
or predicted ring event. In addition it provides and the average value for the occultation of the smoothing
effects of the Frescal scale, the projected star size, and instrumental time constant times velocity of
the occultation perpendicular to the ring projected in the sky plane. Details are given in Section 4 of
User Guide.
First
English
1
A CSV table of values provides a convenient summary of the entire set of ring occultation
bundles, identifying which rings were detected in each observation, the quality index QI for each observed
or predicted ring event. In addition it provides and the average value for the occultation of the smoothing
effects of the Frescal scale, the projected star size, and instrumental time constant times velocity of
the occultation perpendicular to the ring projected in the sky plane. Details are given in Section 4 of
User Guide.
The first row provides appreviated column headers.
column 1 - Bundle ID
column 2 - Fresell Scale in km
column 3 - Projected star size in km
column 4 - Instrumental time constant times velocity of the occultation perpendicular to the ring projected
in the sky plane in km.
column 5 to 24 - Individual rings from inner most to outer most, first 10 columns are ingress, next ten are egress.
Quality Index (QI) scores which are a subjective assessment of the quality of the observed/predicted
ring occultation: possible values are:
0 Not observable - observations at the predicted occultation event time for this ring were either
not recorded (for example, the star was below the horizon) or the occultation chord did not
intersect the ring.
1 High-SNR profile with sharp edges matched by square-well model fit
2 Moderate-SNR profile with well-defined midtime from square-well model fit but possible systematic
deviations of observed ring profile from model fit
3 Clear ring detection but less-reliable ring width and or mid-time due to noise or substantial
convolution by star diameter and/or instrumental time constant
4 Unreliable detection - some hint of a ring occultation, fitted by square-well model, but ~50%
chance it is just noise
5 No detection - Data were recorded at the expected location of a ring occultation, but no ring was
observed, either because ring event was obscured by noise or (for the lambda ring) the optical depth
of the ring at the observed longitude was below detectability, even if the overall SNR of the data is high.
6 Is not an indication of data quality. Indicates the product is a profile of the entire ring system based
on the equator system of the planet.
column 25 - Summary ranking for each observation bundle as a whole, determined from the rounded average value of the
QIs for the rings for which data were recorded, excluding the lambda ring. The event is ranked as:
Good (G) if the rounded average is 1 or 2,
Fair (F) if the result is 3,
Poor (P) if the result is 4.
uranus_ringocc_bundles_quality_rating.csv
2020-12-08
93af158a537e2335f490d96d94251d57
7-Bit ASCII Text