H- and K-band Spectroscopy of Neptune and Triton in July 1999

Details H- and K-band Spectroscopy of Neptune and Triton in July 1999 H- and K-band Spectroscopy of Neptune and Triton in July 1999

May 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003dps....35.4007f&link_type=abstract

American Astronomical Society, DPS meeting #35, #40.07; Bulletin of the American Astronomical Society, Vol. 35, p.995

Astronomy and Astrophysics

Astronomy

Scientific paper

During the period 18-21 July 1999, H- and K-band spectra of Neptune and Triton were acquired with the NSFCam HKL grism (R 290) at the NASA Infrared Telescope Facility (IRTF). Observed OH sky emission lines were used to wavelength calibrate the spectra. Vega was used as a reference star for relative flux calibration and telluric absorption correction. The spectra will be absolutely calibrated using photometry from narrow-band imaging of infrared standard stars.
Comparison of our Triton spectra with that of Quirico et al. (Icarus 139, 159-178, 1999), shows very little change since their September 1995 observatons. As expected, we were unable to discern any significant rotational modulation in the spectrum over the four nights.
Pseudo-disk-integrated spectra of Neptune were obtained by stepping the grism slit across the planet, then summing the signal to produce the resulting spectra. The spectra have higher S/N ratios than the corresponding regions of the Fink and Larson (ApJ 233, 1021-1040, 1979) spectrum.
This work was funded by NASA Planetary Astronomy Grant NAG5-12206 and HST Archive Research Grant AR-0922.01-A. We thank the NASA IRTF and our support astronomer William Vacca for their assistance.

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