nh-x-mvic-2-plutocruise-v1.0nh-x-mvic-3-plutocruise-v1.0

Matthew Knight (lead reviewer)

Overview• New Horizons cruise phase observations from the

MVIC instrument• Contents

– Raw and reduced data– Targets: Uranus, Neptune, M6, M7, functional testing– Extensive documentation, calibration info, etc.

• Comments– Less intuitive to figure out how to use the data at first

compared to some PDS datasets I’ve seen– However, it is well documented and after reading

documentation and looking through directories everything needed appears to be there

• But it turns out to not be as clear as I thought (stay tuned)

What data are available?• [Note this is for LORRI but also applies to MVIC]• Dataset.cat details when each observation occurred

• Where do I find these?– “Start UTC: 2007-279”

• But I don’t know easily what day 279 is?

– “Start SCLK: 1/0053937714” • From aareadme.txt I know the data directories have dates and

SCLK numbers

Bingo!

Using the data

• Which specific image(s) in that directory?– Look in document/seq_lorri_plutocruise.tab

• LOR","07267:A1LR038_01_KBO2005FY9 ","2007-10-06T00:49:57","1/0053937714:27334","Cruise science on KBO target

– But…there’s no image with “0053937714” in the file name:

– However, there are some with lor_00539377*– Open them and look at headers to confirm they are

what I’m looking for

Using the data• Color images of Neptune sound interesting

(document/seq_mvic_plutocruise.tab)

• What am I looking at?– Catalog/mvic.cat tells me there are 5024x32 arrays in five filters

(panchromatic, blue, red, NIR, CH4)– But this array is 5024x629, so what am I looking at?

• Is this a composite of all five filters? – After looking at the header I think its just one filter, but it’s confusing

• Are the extra lines due to scanning?

Using the data

• Looking through various files in catalog/ and document/ I don’t see anything that obviously explains these images– There is a ton of documentation of *how* the

instrument works, but not much on how to actually use the data

– Explanations of FITS header keywords would be useful

• Also, where is Uranus?

• Now looking at M7– This looks like a star field (yay)!

• From header: SCANTYPE=FRAMING, EXPTIME=1

– What is this?• From header: SCANTYPE=TDI, EXPTIME=2.9

– As someone without any previous experience: how do I find more information to help me interpret this?

Using the data

Using the data

• Now that I look at raw and reduced I’m really confused about what this is?

raw reduced

Review• Data are well documented, but could be easier to navigate

– Would be useful to list the filters acquired for a given target

– Or make an actual observing log that lists every image, not just sets

• Would be useful to give pixel positions of specific targets when possible• Despite quite a bit of effort I can’t find sufficient documentation on how to

use/interpret these data– There should be something that clearly explains the images since it does not

appear to be straightforward (hopefully I just overlooked something?)

• document/nh_ralph_v100_ti.txt – Line 161: 13 references that do not appear to be archived anywhere and not

necessarily retrievable:

– Why is this document written in the future tense?

Review (continued)

• Listed in dataset.cat but not in data/

• Minor typos given to Ludmilla

nh-x-lorri-2-plutocruise-v1.0nh-x-lorri-3-plutocruise-v1.0

Matthew Knight (2nd reviewer)

Overview• New Horizons cruise phase observations from the

LORRI instrument• Contents

– Raw and reduced data– Targets: Neptune, Jupiter, KBOs, star fields– Extensive documentation, calibration info, etc.

• Comments (similar as for MVIC)– Less intuitive to figure out how to use the data at first

compared to some PDS datasets I’ve seen– However, it is well documented and after reading

documentation and looking through directories everything needed appears to be there

• This time I can make sense of images!

What data are available?• Dataset.cat details when each observation occurred

• Where do I find these?– “Start UTC: 2007-279”

• But I don’t know easily what day 279 is?

– “Start SCLK: 1/0053937714” • From aareadme.txt I know the data directories have dates and

SCLK numbers

Bingo!

Using the data

• Which specific image(s) in that directory?– Look in document/seq_lorri_plutocruise.tab

• LOR","07267:A1LR038_01_KBO2005FY9 ","2007-10-06T00:49:57","1/0053937714:27334","Cruise science on KBO target

– But…there’s no image with “0053937714” in the file name:

– However, there are some with lor_00539377*– Open them and look at headers to confirm they are

what I’m looking for

Using the data• Once images are found,

which is the target?– Nothing moves when

blinking images• This is the Makemake

field, so maybe it’s too faint?

– Next step (I guess): compare to a star chart

• Is the position given some where?– Presumably the team

knows where it is so this shouldn’t be difficult

Review• Data are well documented but could be easier to

navigate– A more complete log than seq_lorri_plutocruise.tab would

be useful (e.g. list all images for a given target, not just sets)

– The sequence list should use YYYYMMDD instead of YYYY-DOY to be consistent with layout of data/

• Would be useful to give pixel positions of specific targets when possible

• Document/nh_lorri_v100_ti.txt (similar to MVIC)– Lists 10 references that do not appear to be archived

anywhere and not necessarily retrievable, e.g. “10. Response to LORRI OpNav action items, forwarded in an e-mail from Howard Taylor on 12/21/2006”

– Why is this document written in the future tense?

Review

• These are listed in dataset.cat but don’t seem to be in data/

• A few typos given to Ludmilla