Add to ORKGCCD imaging and time series photometry are used to determine the state of activity, nuclear properties and eventually the rotational motion of cometary nuclei. Cometary activity at large heliocentric distances and mantle evolution are not yet fully understood. Results of observations carried out at the 2.1 telescope on Kitt Peak April 10-12 and May 15-16, 1991 are discussed. Color values and color-color diagrams are presented for several comets and asteroids. Estimations of nuclear radii and shapes are given
Observations of comet Levy were carried out with the Hubble Space Telescope (HST) on UT 27 Sep. 1990...
Comet C/2014 UN271 (Bernardinelli-Bernstein), incoming from the Oort cloud, is remarkable in having ...
The prevalent non-gravitational motions among comets demonstrate that the sublimination does not rea...
Scientific goals include a better determination of the basic physical characteristics of cometary nu...
We present time-series data on Jupiter Family Comets (JFCs) 17P/Holmes, 47P/Ashbrook-Jackson and 137...
Because of their temporal and spatial variations, modern ground-based studies of comets within appro...
The scientific objectives were as follows: (1) to construct a well sampled photometric time series o...
Understanding how comets work is one of the more compelling questions to which Rosetta mission is tr...
Evidence is presented for classifying cometary nuclei into two basic types, described by core mantle...
The discovery that periodic variations in the brightness of Comet Halley were characterized by two u...
Spectroscopic observations of the Giacobini-Zinner comet were performed on March 20, June 20 and 21,...
Thermal-infrared (10 and 20 micron) images of Comet Austin were obtained on UT 30.6 Apr., 1.8, 2.8, ...
The objective is to investigate the spectroscopic and morphological characteristics of comets and se...
When this program began in 1975 only limited photometry had been carried out on comets at any wavele...
The physical properties of Comet P/Halley are being monitored from the ground using state of the art...
Observations of comet Levy were carried out with the Hubble Space Telescope (HST) on UT 27 Sep. 1990...
Comet C/2014 UN271 (Bernardinelli-Bernstein), incoming from the Oort cloud, is remarkable in having ...
The prevalent non-gravitational motions among comets demonstrate that the sublimination does not rea...
Scientific goals include a better determination of the basic physical characteristics of cometary nu...
We present time-series data on Jupiter Family Comets (JFCs) 17P/Holmes, 47P/Ashbrook-Jackson and 137...
Because of their temporal and spatial variations, modern ground-based studies of comets within appro...
The scientific objectives were as follows: (1) to construct a well sampled photometric time series o...
Understanding how comets work is one of the more compelling questions to which Rosetta mission is tr...
Evidence is presented for classifying cometary nuclei into two basic types, described by core mantle...
The discovery that periodic variations in the brightness of Comet Halley were characterized by two u...
Spectroscopic observations of the Giacobini-Zinner comet were performed on March 20, June 20 and 21,...
Thermal-infrared (10 and 20 micron) images of Comet Austin were obtained on UT 30.6 Apr., 1.8, 2.8, ...
The objective is to investigate the spectroscopic and morphological characteristics of comets and se...
When this program began in 1975 only limited photometry had been carried out on comets at any wavele...
The physical properties of Comet P/Halley are being monitored from the ground using state of the art...
Observations of comet Levy were carried out with the Hubble Space Telescope (HST) on UT 27 Sep. 1990...
Comet C/2014 UN271 (Bernardinelli-Bernstein), incoming from the Oort cloud, is remarkable in having ...
The prevalent non-gravitational motions among comets demonstrate that the sublimination does not rea...