EPOXI Review - 29 September 2010 EAR-C-COMPIL-5-COMET-NUC-PROPERTIES-V2.0 ======================================== [Additional data added to existing data set, collected from the literature.] o Reformat the comet.tab file to follow the style of the albedoes.tab file, with one record for each reference rather than one column for each reference. Consider adding record sequence numbers to track multiple records from the same comet. o Add an indication that a) this a V2.0 and b) why there is a V2 in all the appropriate places in the dataset.cat file. o Remove target catalog files that are not necessary. o Mike A'Hearn n submitted data liens prior to the review, which are included below. These liens must also be addressed in some appropriate matter (additional entries, additional footnotes, etc.). [Note that some liens refer to PDS data sets, which count as publications!] Liens on the Comet Radii data o 9P/Tempel 1: Belton's 2005 result has been added (3.5 km) but this was not from new observations. The value from Thomas et al. (2005 Icarus 187, 4) is fro m the in-situ imaging with a value 3.0+/-0.1. This is NOT included even though it is the best value o 81P/Wild 2: Best value is probably the triaxial fit to the plate model, 1.92 o 103P/Hartley 2: we are missing a paper by Lisse et al. 2009 in PASP which gets ~0.6 km. I would pick an average of that with the previous value of 0.8 as a best guess now, i.e. 0.7. Of course epoxy will measure it accurately in November Liens on the table shape_and_size.tab o 9P/Tempel 1: That result by Belton is entirely inconsistent (by a huge amount) with the result obtained from the in situ imaging by Thomas et al. It should be deleted and replaced with something based on the Peter Thomas paper in Icarus. o 81P/Wild 2: WHy is there no entry for Wild 2 in this table when we have a complete shape model archived at SBN? This is one of only 4 comets for which the shape is DIRECTLY measured as opposed to being inferred from light curves, which is the case for all the others in the table except Halley, Borrelly, and Tempel 1. In our own archive we have both a detailed plate model and a triaxial ellipsoid model so the latter, which was done by Tom Duxbury, can be trivial ly fit into the table. There was also a triaxial ellipsoid fitted to the plate model with somewhat different dimensions than Duxbury's original ellipsoid f itted to the images. o 2P/Encke: The conventional representation and also the column names indicate that the axes a and b have been interchanged for this entry. General o In most cases of shapes determined from light curves (all but the 4 mentioned above), the values of one axis or another are limits. In particular, generall y one measures a lower limit to the ratio a/b (and usually assumes c=b unless there are observations at many different phases), plus a product of a and b. This pretty much means a lower limit on a and an upper limit on b. All of this is spelled out in the original references but we might want to make this cle ar in the dataset.cat file. o Richard Chen submitted a list of standards compliance issues via email, which are included here: catalog/reference.cat o LAMYETAL2004 and BELTONETAL2005 have worse formatting. Recommended changes: OLD> Lamy P.L., I. Toth, Y.R. Fernandez and H.A. Weaver, 'The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei', in 'Comets II' (M.C. Festou et al., e ds.), University of Arizona Press, Tucson in collaboration with the Lunar and Planetary Institute, Houston, pp. 223-264, 2004. NEW> Lamy P.L., I. Toth, Y.R. Fernandez and H.A. Weaver (2004), The Sizes, Shapes, Albedos, and Colors of Cometary Nuclei, in 'Comets II', edited by M.C. Festou et al., pp. 223-264, University of Arizona Press, Tucson, in collaboration with the Lunar and Planetary Institute, Houston. OLD> Belton, M.J.S., K.J. Meech, M.F. A'Hearn, O. Groussin, L. McFadden, C. Lisse, Y.R. Fernandez, J. Pittachova, H. Hsieh, J. Kissel, K. Klaasen, P. Lamy, D. Prialnik, J. Sunshine, and I. Toth, Deep Impact: Working Properties for the Target Nucleus Comet 9P/Tempel 1, Space Science Reviews, 117, 137-160, 2005, doi:10.1007/s11214-005-3389-1. NEW> Belton M.J.S., K.J. Meech, M.F. A'Hearn, O. Groussin, L. McFadden, C. Lisse, Y.R. Fernandez, J. Pittichova, H. Hsieh J. Kissel, K. Klaasen, P. Lamy, D. Prialnik, J. Sunshine, P. Thomas and I. Toth, Deep Impact: Working Properties for the Target Nucleus Comet 9P/Tempel 1, Space Sci. Rev., 117, 137-160, 2005. index/index.lbl o Should have VOLUME_ID = "SA1001_0001" o Consider adding a separate table with the current "best value" according to some named authority to the next version of this data set. The review committee agreed that these data are not certifiable as is. Delta review is required.