The University of Southampton
University of Southampton Institutional Repository

High-resolution thermal infrared imaging of 3200 Phaethon

High-resolution thermal infrared imaging of 3200 Phaethon
High-resolution thermal infrared imaging of 3200 Phaethon
We present thermal infrared observations of the active asteroid (and Geminid meteoroid stream parent) 3200 Phaethon using the Very Large Telescope. The images, at 10.7 μm wavelength, were taken with Phaethon at its closest approach to Earth (separation of 0.07 au) in 2017 December, at a linear resolution of about 14 km. We probe the Hill sphere (of radius ~66 km) for trapped dust and macroscopic bodies, finding neither, and we set limits to the presence of unbound dust. The derived limits to the optical depth of dust near Phaethon depend somewhat on the assumed geometry, but are of an order of 10−5. The upper limit to the rate of loss of mass in dust is lesssim14 kg s−1. This is ~50 times smaller than the rate needed to sustain the Geminid meteoroid stream in steady state. The observations thus show that the production of the Geminids does not proceed in a steady state.
0004-637X
Jewitt, David
18ece041-d8de-4ed5-94ec-9243ba4df416
Asmus, Daniel
f783516a-c74c-4912-b68e-4e896e4317b2
Yang, Bin
4ba4d94d-6684-4160-a496-083fec9c3f8a
Li, Jing
fafa4088-5b81-4c81-9228-ae4da619d9ff
Jewitt, David
18ece041-d8de-4ed5-94ec-9243ba4df416
Asmus, Daniel
f783516a-c74c-4912-b68e-4e896e4317b2
Yang, Bin
4ba4d94d-6684-4160-a496-083fec9c3f8a
Li, Jing
fafa4088-5b81-4c81-9228-ae4da619d9ff

Jewitt, David, Asmus, Daniel, Yang, Bin and Li, Jing (2019) High-resolution thermal infrared imaging of 3200 Phaethon. The Astrophysical Journal, 157 (5), [193]. (doi:10.3847/1538-3881/ab13a9).

Record type: Article

Abstract

We present thermal infrared observations of the active asteroid (and Geminid meteoroid stream parent) 3200 Phaethon using the Very Large Telescope. The images, at 10.7 μm wavelength, were taken with Phaethon at its closest approach to Earth (separation of 0.07 au) in 2017 December, at a linear resolution of about 14 km. We probe the Hill sphere (of radius ~66 km) for trapped dust and macroscopic bodies, finding neither, and we set limits to the presence of unbound dust. The derived limits to the optical depth of dust near Phaethon depend somewhat on the assumed geometry, but are of an order of 10−5. The upper limit to the rate of loss of mass in dust is lesssim14 kg s−1. This is ~50 times smaller than the rate needed to sustain the Geminid meteoroid stream in steady state. The observations thus show that the production of the Geminids does not proceed in a steady state.

Text
High-resolution Thermal Infrared Imaging of 3200 Phaethon - Accepted Manuscript
Download (1MB)

More information

Accepted/In Press date: 25 March 2019
Published date: 29 April 2019

Identifiers

Local EPrints ID: 431654
URI: http://eprints.soton.ac.uk/id/eprint/431654
ISSN: 0004-637X
PURE UUID: ed7efaa2-b19d-4987-96ac-1f86c608780b

Catalogue record

Date deposited: 12 Jun 2019 16:30
Last modified: 22 May 2020 16:32

Export record

Altmetrics

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×