Gemini-N Images

Here is a GMOS image in .png and .jpg format for pointing, taken in Gemini-N on 2009-Sep-11-13:12 UT. The exact slit positions will be revised before impact after image analyses by Diane Wooden w.r.t. coordinates supplied by the LCROSS Mission and the shadow models.

I am posting 3 images and an ejecta flux prediction (W/(m^2 um arcsec^2)) versus Wavelength (um) for 3 different values of the grain column density (1E7 m^-2 represents 4-20 sec; 2E5 m^-2 represents 30-90 sec). The brighter part of the ejecta plume reaches about 1.5 to 3 arc sec in height and spreads to 15″-30″ wide in 120-240 sec. The grain column densities are based on models by LCROSS Science Team Member D. Goldstein (Goldstein, D.B. et al. 2008, Amer. Inst. Phys.1084, 1061).

Gemini-N GMOS image from 2009-Sep-11-13:12UT in two formats, at G-band (398-552 nm)+ RG610 (blue blocking) to avoid saturation. (http:// www.gemini.edu/sciops/instruments/gmos/imaging/filters/gmosn-filters) mrgN20090911S0308.jpg mrgN20090911S0308.png

Gemini-N Acquisition Camera image with pointing craters labeled. cabeus_region_pointing_Cabeus_A1.pdf

Flux calculations based on number density of lofted 35um regolith grains. ejecta_flux_predict_09sep02.pdf

I have added labels to the Gemini Acquisition Camera image to show the craters relevant for pointing to Cabeus A1. When showing these images, please site: 2009-Sep-11-13:12UT GMOS Gemini-N (GN-2009B-Q-35) LCROSS Ground-Based Observation Campaign, Mauna Kea Spectroscopy Team: D. Wooden, C. Woodward, P. Lucey, D. Harker, E. Young, M. S. Kelley, T. Geballe, M. DiSanti, A. Conrad, D. Goldstein, A. Stephens, K. Roth, J. Rayne

Suggested Pointing Sequence for Spectroscopy
Casatus_C_Waypt1
Newton_E_Waypt2
Waypt3
Cabeus_A1

Pointing coordinates refer to the observer’s centroid on the elliptical shape of the crater, not on the common designation coordinates.

Pointing_Designation lon lat altitude
Casatus_C_Waypt1 330.23 -72.195 0 km
Newton_E_Waypt2 323.79 -79.820 -1.3 km
Waypt3 321.22 -81.062 -1.0 km
Cabeus_A1 316.90 -81.55 -2.0 km
Altitude for Sun-Horizon
Bettinus 330.23 -72.195 0 km
Alternative to Casatus_C_Waypt1 as lunar phase wanes

In JPL horizons, derive Right Ascension and Declination and lunar tracking rates by using g: long, lat, altitude @301 in the OBJECT SEARCH BOX – see attached screen grab as an example.

wooden