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          Institute: MPI für Radioastronomie     Collection: Publikationen des MPI für Radioastronomie     Display Documents



ID: 10855.0, MPI für Radioastronomie / Publikationen des MPI für Radioastronomie
Radio continuum observations of comet C/1999 S4 (LINEAR) before, during, and after break-up of its nucleus
Authors:Altenhoff, W. J.; Bertoldi, F.; Menten, K. M.; Sievers, A.; Thum, C.; Kreysa, E.
Language:English
Date of Publication (YYYY-MM-DD):2002
Title of Journal:Astronomy & Astrophysics
Journal Abbrev.:Astron. Astrophys.
Volume:391
Issue / Number:1
Start Page:353
End Page:360
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:We observed radio continuum emission from Comet C/1999 S4 before, during, and after break-up of its nucleus. The detections before break-up indicate a photometric diameter of 4.7 km, from which we estimate that the nuclear diameter was about 0.9 km. We derive a dust production rate of similar to 9 x 10(4) g s(-1), corresponding to 0.03 g s(-1) per square meter of the nuclear surface area, which is comparable to the values found for comets 1P/Halley and C/1995 O1 (Hale-Bopp). The implied gas-to-dust mass production ratio was between 2 and 5. The high daily erosion rate and the continuous fragmentation over months, as derived from water production rates, could not be confirmed. The low radio emission of the fragments directly after the break-up and their low cometary activity may be explained by their low surface temperatures. The published optical and most radio data support that the main nuclear decay started July 23, 2000. Our upper limits on the flux density obtained after the nuclear disintegration put an upper bound on the particulate dust mass released during that event. A scenario in which most of the nucleus disintegrated into many big boulders and part of it into a dust cloud is consistent with our observations.
Free Keywords:comets : general; comets : individual : C/1999 S4; radio continuum : solar system
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Radioastronomie
External Affiliations:Max Planck Inst Radioastron, Hugel 69, D-53121 Bonn, Germany; Max Planck Inst Radioastron, D-53121 Bonn, Germany; Inst Radio Astron Millimeter Wavelengths, Granada 18012, Spain; Inst Radio Astron Millimeter Wavelengths, F-38406 St Martin Dheres, France
Identifiers:ISI:000177304700032
ISSN:0004-6361
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