English
 
User Manual Privacy Policy Disclaimer Contact us
  Advanced SearchBrowse

Item

ITEM ACTIONSEXPORT
  Properties of the Bare Nucleus of Comet 96P/Machholz 1

Eisner, N. L., Knight, M. M., Snodgrass, C., Kelley, M. S. P., Fitzsimmons, A., & Kokotanekova, R. (2019). Properties of the Bare Nucleus of Comet 96P/Machholz 1. Astronomical Journal, 157(5): 186. doi:10.3847/1538-3881/ab0f42.

Item is

Basic

show hide
Item Permalink: http://hdl.handle.net/21.11116/0000-0006-67E5-4 Version Permalink: http://hdl.handle.net/21.11116/0000-0006-67E6-3
Genre: Journal Article

Files

show Files

Locators

show

Creators

show
hide
 Creators:
Eisner, N. L., Author
Knight, M. M., Author
Snodgrass, C., Author
Kelley, M. S. P., Author
Fitzsimmons, A., Author
Kokotanekova, Rosita1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

Content

show
hide
Free keywords: -
 Abstract: We observed comet 96P/Machholz 1 on a total of nine nights before and after perihelion during its 2017/2018 apparition. Both its unusually small perihelion distance and the observed fragmentation during multiple apparitions make 96P an object of great interest. Our observations show no evidence of a detectable dust coma, implying that we are observing a bare nucleus at distances ranging from 2.3 to 3.8 au. Based on this assumption, we calculated its color and found average values of g'–r' = 0.50 ± 0.04, r'–i' = 0.17 ± 0.03, and i'–z' = 0.06 ± 0.04. These are notably more blue than those of the nuclei of other Jupiter-family and long-period comets. Furthermore, assuming a bare nucleus, we found an equivalent nuclear radius of 3.4 ± 0.2 km with an axial ratio of at least 1.6 ± 0.1. The lightcurve clearly displays one large peak, one broad flat peak, and two distinct troughs, with a clear asymmetry that suggests that the shape of the nucleus deviates from that of a simple triaxial ellipsoid. This asymmetry in the lightcurve allowed us to constrain the nuclear rotation period to 4.10 ± 0.03 hr and 4.096 ± 0.002 hr before and after perihelion, respectively. Within the uncertainties, 96P's rotation period does not appear to have changed throughout the apparition, and we conclude a maximum possible change in rotation period of 130 s. The observed properties were compared to those of comet 322P and interstellar object 1I/'Oumuamua in an attempt to study the effects of close perihelion passages on cometary surfaces and their internal structure and the potential interstellar origin of 96P.

Details

show
hide
Language(s): eng - English
 Dates: 2019
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.3847/1538-3881/ab0f42
 Degree: -

Event

show

Legal Case

show

Project information

show

Source 1

show
hide
Title: Astronomical Journal
  Other : Astron. J.
Source Genre: Journal
 Creator(s):
Affiliations:
Publ. Info: Chicago : Published by the University of Chicago Press for the American Astronomical Society
Pages: - Volume / Issue: 157 (5) Sequence Number: 186 Start / End Page: - Identifier: ISSN: 0004-6256
CoNE: https://pure.mpg.de/cone/journals/resource/954922828207