: Hicks_M in: astro-ph - SciRate Search

: Hicks_M in: astro-ph - SciRate Search

: Hicks_M in: astro-ph - SciRate Search

: Hicks_M in: astro-ph - SciRate Search

@misc {1209.1207, author = {Vishnu Reddy and Lucille Le Corre and Michael Hicks and Kenneth Lawrence and Bonnie Buratti and Paul Abell and Michael Gaffey and Paul Hardersen}, title = {{C} omposition of {N} ear- {E} arth {A} steroid 2008 {EV} 5: {P} otential target for {R} obotic and {H} uman {E} xploration}, year = {2012}, eprint = {1209.1207}, note = {arXiv: 1209.1207v1}}

potentially hazardous asteroid (PHA) 2008 EV5 in the visible (0.30-0.92 microns) and near-IR (0.75-2.5 microns) wavelengths to determine its surface composition. This asteroid is especially interesting because it is a potential target for two sample return mission proposals (Marco Polo-R and Hayabusa-2) and human exploration due to its low delta-v for rendezvous. The spectrum of 2008 EV5 is essentially featureless with the exception of a weak 0.48-microns spin-forbidden Fe3 + absorption band. The spectrum also has an overall blue slope. The albedo of 2008 EV5 remains uncertain with a lower limit at 0.05 and a higher end at 0.20 based on thermal modeling. The Busch et al. (2011) albedo estimate of 0.12 is consistent with our thermal modeling results. The albedo and composition of 2008 EV5 are also consistent with a C-type taxonomic classification (Somers et al., 2008). The best spectral match is with CI carbonaceous chondrites similar to Orgueil, which also has a weak 0.48-microns feature and an overall blue slope. This 0.48-microns feature is also seen in the spectrum of magnetite. The albedo of CI chondrites is at the lower limit of our estimated range for the albedo of 2008 EV5.

We report the discovery of a nearby star with a very good motion of 5.06 +/- 0.03 arcsec / yr. The star is called SO025300.5 + 165258 and referred to herein as HPMS (high proper motion star). The discovery came as a result of a search of the SkyMorph database, a sensitive and persistent survey that is well suited for finding stars with high proper motions. There are currently only 7 known stars with proper motions & gt; 5 arcsec / yr. We have determined the preliminary value for the parallax of 0.43 +/- 0.13 arcsec. If this value holds our new star ranks behind only the Alpha Centauri system (including Proxima Centauri) and Barnard's star in the list of our nearest stellar neighbors. The spectrum and measured tangential velocity indicates that HPMS is a main-sequence star with spectral type M6.5. However, if our distance measurement is correct, the HPMS is underluminous by 1.2 +/- 0.7 mag.

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