Stephens, D. C., Leggett, S. K., Cushing, Michael C., Marley, Mark S., Saumon, D., Geballe, T. R., ...
We present new 5.2-14.5 micron low-resolution spectra of 14 mid-L to mid-T dwarfs, as well as 3.0-4.1 micron spectra for five of these dwarfs. These data are supplemented by existing red and...
Mutual Orbits and Masses of Six Transneptunian Binaries (2008)
Grundy, W. M., Noll, K. S., Buie, M. W., Benecchi, S. D., Stephens, D. C., Levison, H. F.
We present Hubble Space Telescope observations of six binary transneptunian systems: 2000 QL251, 2003 TJ58, 2001 XR254, 1999 OJ4, (134860) 2000 OJ67, and 2004 PB108. The mutual orbits of these...
The Correlated Colors of Transneptunian Binaries (2008)
Benecchi, S. D., Noll, K. S., Grundy, W. M., Buie, M. W., Stephens, D. C., Levison, H. F.
We report resolved photometry of the primary and secondary components of 23 transneptunian binaries obtained with the Hubble Space Telescope. V-I colors of the components range from 0.7 to 1.5 with a...
(42355) Typhon-Echidna: Scheduling Observations for Binary Orbit Determination (2008)
Grundy, W. M., Noll, K. S., Virtanen, J., Muinonen, K., Kern, S. D., Stephens, D. C., ...
We describe a strategy for scheduling astrometric observations to minimize the number required to determine the mutual orbits of binary transneptunian systems. The method is illustrated by...
Physical and Spectral Characteristics of the T8 and Later-Type Dwarfs (2007)
Leggett, S. K., Marley, M. S., Freedman, R., Saumon, D., Liu, Michael C., Geballe, T. R., ...
We use new and published near-IR spectra, with synthetic spectra, to derive physical properties of three of the latest-type T dwarfs. A new R~1700 spectrum of the T7.5 dwarf HD 3651B, with existing...
Grundy, W. M., Stansberry, J. A., Noll, K. S., Stephens, D. C., Trilling, D. E., Kern, S. D., ...
Hubble Space Telescope observations of Uranus- and Neptune-crossing object (65489) Ceto/Phorcys (provisionally designated 2003 FX128) reveal it to be a close binary system. The mutual orbit has a...
Discovery of a Binary Centaur (2006)
Noll, K. S., Levison, H. F., Grundy, W. M., Stephens, D. C.
We have identified a binary companion to (42355) 2002 CR46 in our ongoing deep survey using the Hubble Space Telescope's High Resolution Camera. It is the first companion to be found around an object...
We have analyzed a homogeneous set of observations of eighty-one transneptunian objects obtained with the NIC2 camera on the Hubble Space Telescope with the goal of identifying partially resolved...
Evidence of Orbital Motion in the Binary Brown Dwarf Kelu-1AB (2005)
Gelino, Christopher R., Kulkarni, S. R., Stephens, D. C.
We have resolved Kelu-1 into a binary system with a separation of ~290 mas using the Laser Guide Star Adaptive Optics system on the Keck II telescope. We have also re-analyzed a 1998 HST observation...
Diverse Albedos of Small Trans-Neptunian Objects (2005)
Grundy, W. M., Noll, K. S., Stephens, D. C.
Discovery of transneptunian object (TNO) satellites and determination of their orbits has recently enabled estimation of the size and albedo of several small TNOs, extending the size range of objects...
The Orbit, Mass, and Albedo of Transneptunian Binary 1999 RZ253 (2004)
Noll, K. S., Stephens, D. C., Grundy, W. M., Griffin, I.
We have observed 1999 RZ253 with the Hubble Space Telescope at seven separate epochs and have fit an orbit to the observed relative positions of this binary. Two orbital solutions have been...
L-Band Photometry of L and T Dwarfs (2001)
Stephens, D. C., Marley, M. S., Noll, K. S., Chanover, N.
We present K- and L-band photometry obtained with the Keck I telescope for a representative sample of L and T dwarfs. These observations were motivated in part by the dominant role water and methane...
Coal reserves surveying, Buller coalfield / (1946)
Thesis (Diploma of Associateship of Otago School of Mines)--University of Otago.