The Inner Coma and Nucleus of Comet Hale–Bopp: Results from a Stellar Occultation

  title={The Inner Coma and Nucleus of Comet Hale–Bopp: Results from a Stellar Occultation},
  author={Yanga R. Fern{\'a}ndez and Dennis Wellnitz and Marc W. Buie and Edward Wood Dunham and Robert L. Millis and Russell A. Nye and J. Stansberry and Lawrence H. Wasserman and Michael F. A’Hearn and Carey M. Lisse and Meg E. Golden and Robert R. Howell and Roberto Marcialis and Joseph Nicholas Spitale},
Abstract We discuss the properties of the nucleus and inner coma of Comet Hale–Bopp (C/1995 O1) as derived from observations of its occultation of Star PPM 200723 on 5 October 1996, while the comet was 2.83 AU from the Sun. Compared to previous occultations by active comets, this is possibly the closest to the nucleus one has ever observed. Three chords (lightcurves) through the comet's inner coma were measured, though only one chord has a strong indication of measuring the occultation, and… 

Figures and Tables from this paper

The Nucleus of Comet Hale-Bopp (C/1995 O1): Size and Activity

A review of our current understanding of Comet Hale-Bopp’s nuclear size is presented. Currently the best constraints on the effective radiusare derived from late-1996 mid-IR data and near-perihelion

Studying Comets by the Stellar Occultation Method

Stellar occultations by comets are generally problematic. The coma is usually too tenuous to be detected by the attenuation effect on stars unless the comet is a very active one and the nucleus


On 2007 October 29, the outbursting comet 17P/Holmes passed within 0.″79 of a background star. We recorded the event using optical, narrowband photometry and detect a 3%–4% dip in stellar brightness

CO in distantly active comets

Activity of most comets near the Sun is dominated by sublimation of frozen water, the most abundant ice in comets. Some comets, however, are active well beyond the water-ice sublimation limit of ~3

Observation of Stellar Occultations by Asteroid (259) Alethea and Comet 21P/Jacobini−Zinner

Abstract— Instrumentation for observing occultations of stars by Solar System bodies and its parameters are described. The complex is designed for observations at the AZT-2 telescope ( D = 70 cm, F =

CO and Other Volatiles in Distantly Active Comets

The activity of most comets near the Sun is dominated by the sublimation of frozen water, the most abundant ice in comets. Some comets, however, are active well beyond the water-ice sublimation limit

Broadband infrared photometry of comet Hale-Bopp with ISOPHOT ?

Comet Hale-Bopp was observed ve times with ISOPHOT, the photometer on board ESA's Infrared Space Observatory (ISO) between 4.6 and 2.8 AU. Each time, broadband photometry was performed using 4

Thermal Infrared Imaging and Spectroscopy of Comet Hale-Bopp (C/1995 O1)

We present λ = 3-5 and 8-13 μm images and long-slit spectra of comet Hale-Bopp (C/1995 O1) taken in 1997 February-April, near the time of perihelion passage. In agreement with other infrared



Thermal modeling of cometary nuclei

Estimating the Size of Hale-Bopp's Nucleus

A variety of independent methods have been used to estimate the size of the nucleus of comet Hale-Bopp. Several groups have analyzed optical and infrared images of the comet and claim to detect the

The Nucleus of Comet Hyakutake (C/1996 B2)

Abstract Infrared, optical, and radio continuum observations were made of the long-period comet C/Hyakutake 1996 B2 during its close approach to Earth in March 1996. Using these observations to

The Activity and Size of the Nucleus of Comet Hale-Bopp (C/1995 O1)

Analysis of Hubble Space Telescope (HST) images of comet Hale-Bopp (C/1995 O1) suggests that the effective diameter of the nucleus is between 27 to 42 kilometers, which is at least three times larger

Infrared Observations Of Dust Emission From Comet Hale-Bopp

We present infrared imaging and photometry of the bright, giant comet C/1995 O1 (Hale-Bopp). The comet was observed in an extended infrared and optical observing campaign in 1996–1997. The infrared

Long-term Evolution of the Outgassing of Comet Hale-Bopp From Radio Observations

C/1995 O1 (Hale-Bopp) has been observed on a regular basis since August 1995 at millimetre and submillimetre wavelengths using IRAM, JCMT, CSO and SEST radio telescopes. The production rates of eight

Stellar Occultation by 2060 Chiron

Abstract A 14th magnitude double star was occulted by 2060 Chiron on 1993 November 7. Observations of this event were obtained from five locations in California. An occultation by Chiron's nucleus