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Rosetta Lutetia ALICE PDS Review. Jeff Morgenthaler. Major Nits. PDS labels for level 4 spectro -imaging pixels are not consistent with FITS headers or data Not PDS labeled as “per Angstrom” Referred to as level 3 product

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Rosetta lutetia alice pds review

Rosetta LutetiaALICE PDS Review

Jeff Morgenthaler


Major nits
Major Nits

  • PDS labels for level 4 spectro-imaging pixels are not consistent with FITS headers or data

    • Not PDS labeled as “per Angstrom”

    • Referred to as level 3 product

  • No reference for coordinate system of asteroid given (how are SUB_SPACECRAFT_LON/LAT determined)?

    • maybe this is my ignorance


Cudos
Cudos

  • GEOMETRY directory is nice (at least for stars)

    • Checked consistency with one of the stellar calibrations

      • Star not centered in slit image in GEOMETRY image

      • Stellar spectrum not centered in ALICE image

      • Makes sense

  • DOCUMENTATION is extensive (but could use a dictionary, see next page)

    • Very nice to have pipeline reduction code


Minor nits
Minor Nits

  • What is OBT? (not in a dictionary of terms), in another world I have heard this called mission elapse time (MET). But is it different?

  • What is AST2?

  • What is LIN

    • Found answer in DOCUMENT/ALICE_DATA_TO_RAYLEIGHS.ASC but a dictionary would be a nicer place to collect all of this stuff

  • CATALOG/CATINFO.TXT

    • IMHOST.CAT  RO.CAT

    • MISSION.CAT  ROSETTA.CAT

    • ALICE_RO.CAT  INST.CAT


Pds questions
PDS questions

  • No systematic overview of directory naming structure

  • e.g. explaining all acronyms in mission_inst_level_???_ver in, say, CATINFO.TXT

  • Is this normal for PDS?

  • Connection to higher meta-level is always nice, so you don’t have to start in exactly the “right place” at the top level

    • What if PDS software goes missing?


In alice ro cat
In ALICE_RO.CAT

  • The detector has a 1024x32 pixel format (wavelength x spatial) with two side-by-side, solar-blind cathodes separated by a small gap.

  • Suggest:

  • The detector has a 1024x32 pixel format (wavelength x spatial) with two side-by-side, solar-blind cathodes separated by a small wavelength gap.


Document docinfo txt
DOCUMENT/DOCINFO.TXT

  • [DOCUMENT] Directory containgin supplemental documentation for Alice data.

  • typo

  • [DOCUMENT] Directory containing supplemental documentation for Alice data.

  • Very nice to have the code.


Calib ra flat 002 fit
CALIB/RA_FLAT_002.FIT

  • header explains flat problem, which is almost visible in ds9

  • Is this something that could be fixed numerically (e.g. smoothed using a combination of cross-dispersion and dispersion direction data)?

    • Talk to me if this is not intuitive


Asteroid image
Asteroid image

  • A little disappointed asteroid was stellar

  • CATALOG/DATASET.CAT:

    • SUB_SPACECRAFT_LATITUDE, SUB_SPACECRAFT_LONGITUDE are given in the PLANETOGRAPHIC coordinate system

    • No reference for this coordinate system is given (that I could find)


Ra 100710150716 his3 lin fit actual science spectrum in nice units
RA_100710150716_HIS3_LIN.FITactual science spectrum in nice units


Ra 100710150716 his3 sci fit not the best science units
RA_100710150716_HIS3_SCI.FITNot the best science units


Sci spec lin spec level 4 pixels are per angstrom
sci_spec/lin_speclevel 4 pixels are per angstrom


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