Linscott, I. R., Bird, M. K., Hinson, D. P., Tyler, G. L., Stern, S. A., Vincent, M. A., DeBoy, C. C., Young, L. A., Beyer, R. A., Ennico, K., Moore, J. M., Gladstone, G. R., Olkin, C. B., Paetzold, M., Schenk, P. M., Strobel, D. F., Summers, M. E., Weaver, H. A. and Grundy, W. M. (2021). High-resolution radiometry of Pluto at 4.2 cm with New Horizons. Icarus, 363. SAN DIEGO: ACADEMIC PRESS INC ELSEVIER SCIENCE. ISSN 1090-2643

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Abstract

The radio thermal emission from Pluto was observed from the New Horizons spacecraft at a wavelength of 4.2 cm along two scans across the planetary disk shortly after closest approach to Pluto on 14 July 2015. The measurements were performed as part of the New Horizons Radio Science Experiment (REX) using the 2.1 m High Gain Antenna (HGA) and the spacecraft's X-Band receiver. The HGA boresight first scanned along a diametric chord across the Pluto disk and then reversed direction to traverse a chord that crossed close to Pluto's winter pole. The diametric scan reveals a hot spot on the Pluto nightside associated with an optically bright region centered roughly at the planetocentric coordinates 280 degrees E, 55 degrees S, imaged in 2002-03 with the Hubble Space Telescope. The nightside was also found to be warmer than the dayside during the polar scan. The highest emission was not observed at the maximum southern latitude, however, but rather near the outbound Pluto limb at lower latitude. The REX emission profile from the polar scan is qualitatively consistent with a bright U-shaped polar cap observed on Pluto's Charon-facing hemisphere during the recurring Pluto/Charon mutual events in the late 1980's. The REX radiometer measurements show distinct variations in microwave brightness that constrain volatile transport models and provide unique information on the thermal structure and composition on the regions in winter night during the New Horizons encounter at Pluto.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Linscott, I. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Bird, M. K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Hinson, D. P.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Tyler, G. L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Stern, S. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Vincent, M. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
DeBoy, C. C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Young, L. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Beyer, R. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Ennico, K.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Moore, J. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gladstone, G. R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Olkin, C. B.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Paetzold, M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Schenk, P. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Strobel, D. F.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Summers, M. E.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Weaver, H. A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Grundy, W. M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-599797
DOI: 10.1016/j.icarus.2021.114430
Journal or Publication Title: Icarus
Volume: 363
Date: 2021
Publisher: ACADEMIC PRESS INC ELSEVIER SCIENCE
Place of Publication: SAN DIEGO
ISSN: 1090-2643
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
THERMAL EMISSION; OCCULTATION MEASUREMENTS; TITANS SURFACE; CHARON; POLARIZATION; TEMPERATURE; TOPOGRAPHY; ATMOSPHERE; ENCELADUS; IAPETUSMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/59979

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