Universität zu Köln

Bird, M. K., Linscott, I. R., Tyler, G. L., Umurhan, O. M., Beyer, R. A., Grundy, W. M., Lisse, C. M., Hinson, D. P., Paetzold, M., Stern, S. A., Weaver, H. A., Olkin, C. B., Young, L. A., Spencer, J. R., Singer, K. N., Moore, J. M., Gladstone, G. R., DeBoy, C. C., Vincent, M. and Porter, S. B. (2022). Detection of Radio Thermal Emission from the Kuiper Belt Object (486958) Arrokoth during the New Horizons Encounter. Planet. Sci. J., 3 (5). BRISTOL: IOP Publishing Ltd. ISSN 2632-3338

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Abstract

The New Horizons spacecraft encountered the Kuiper Belt object (KBO) Arrokoth (486958), originally designated as 2014 MU69 and formerly called Ultima Thule, on 2019 January 01. At 43.3 au from the Sun and 44.4 au from Earth, this was the most distant spacecraft reconnaissance of a solar system body to date. The Radio Science Experiment (REX) on New Horizons performed radiometry measurements of the KBO's thermal emission at lambda = 4.2 cm in two observation slots, one before (dayside) and one after (nightside) the point of closest approach. Owing to the small size of the target, the intensity of the thermal emission was expected to be only marginally detectable. The KBO was not detected on approach because of unexpectedly large variations in the REX system temperature. A brightness temperature T ( b ) = 29 +/- 5 K was derived for the nightside observation, considerably less than the predicted equilibrium temperature of similar to 50 K derived for Arrokoth on the dayside. A model explaining this day-night contrast is used to constrain the global values of emissivity, thermal inertia, and electrical skin depth of the KBO. In particular, models with small values of thermal inertia and small values of electrical skin depth are excluded. Relatively high values of the effective radio emissivity (E (eff) > 0.8) provide better agreement with the REX observation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Bird, M. K. UNSPECIFIED UNSPECIFIED UNSPECIFIED Linscott, I. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Tyler, G. L. UNSPECIFIED UNSPECIFIED UNSPECIFIED Umurhan, O. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Beyer, R. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Grundy, W. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Lisse, C. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Hinson, D. P. UNSPECIFIED UNSPECIFIED UNSPECIFIED Paetzold, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Stern, S. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Weaver, H. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Olkin, C. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED Young, L. A. UNSPECIFIED UNSPECIFIED UNSPECIFIED Spencer, J. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED Singer, K. N. UNSPECIFIED UNSPECIFIED UNSPECIFIED Moore, J. M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Gladstone, G. R. UNSPECIFIED UNSPECIFIED UNSPECIFIED DeBoy, C. C. UNSPECIFIED UNSPECIFIED UNSPECIFIED Vincent, M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Porter, S. B. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-688989
DOI:	10.3847/PSJ/ac5d45
Journal or Publication Title:	Planet. Sci. J.
Volume:	3
Number:	5
Date:	2022
Publisher:	IOP Publishing Ltd
Place of Publication:	BRISTOL
ISSN:	2632-3338
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language RADAR OBSERVATIONS; TITANS SURFACE; PLUTO; ENCELADUS; IAPETUS; COMETS; CHARON; SYSTEM Multiple languages Astronomy & Astrophysics Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/68898