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Scientific Activities

 

Observing Methods

Useful contributions to science can be made from visual observations using telescopes, binoculars, and even the unaided eye.  Images obtained with CCD cameras yield measurements that are more accurate and precise. The fundamental characteristics to be measured normally include position, brightness, and color.  When systemtic measurements are recorded and analyzed, many subtle characteristics can be determined, including the changing brightness of variable stars over time, orbital elements of minor planets, rotational periods and phase curve parameters of asteroids, and precise positions from the timing of occultations and eclipses.

CVAS members routinely make observations of many different types of objects, and often share their results with organizations such as the American Association of Variable Star Observers, the Minor Planet Center, and the Jet Propulsion Laboratory.  Several of our members have had their research published in peer reviewed journals, including Icarus and the Minor Planet Bulletin.

 

Visual Observations

Possible New Radiant in Early February  This article appeared in the February 2000 issue of the Journal of the International Meteor Organization, by George Gliba, CVAS Member.

Aries-Triangulids  Visual meteor observations appearing in the February 1997 issue of The Strolling Astronomer, Journal of the Association of Lunar & Planetary Observers, by George Gliba, CVAS Member.

 

Variable Stars

Dwarf Nova SS Cyg in Outburst

August 2007  SS Cyg at mag 12.2V on August 15 and 8.5V on August 24, Location: Richmond Hts., Ohio, 20.0cm f/5 Newtonian Reflector, SBIG ST-7XME w/V filter, exposure 60.0s & 20.0s, Observer: Robert J. Modic.

September 2009  Photometric measurements of SS Cyg.

Lightcurve Photometry

The Magnitudes of the Planets  This article appeared in the January 2011 issue of Sky & Telescope magazine, and is posted here with permission, by A. Mallama, CVAS Member.

 

Orbit Determination

2003 UV11 October 28, 2010
2003 UV11 October 30, 2010
Two videos of Near Earth Asteroid 2003 UV11 recorded at Indian Hill Observatory in late October 2010.
Details of the observations

Occultation and Eclipse Timing

Jupiter  August 13, 2007, Indian Hill Observatory, CVAS 40.0cm f/7 Newtonian Reflector, SBIG ST-7XME w/V filter, exposure 0.12s, Observer: Robert J. Modic.

Eclipse of Io (video) and Lightcurve  August 13, 2007, 1:46 to 1:51 UT, Indian Hill Observatory, CVAS 40.0cm f/7 Newtonian Reflector, SBIG ST-7XME w/V filter, exposure 0.5s, Observer: Robert J. Modic.

Mutual Event of Ariel and Umbriel Lightcurve and Annotated Image  August 13, 2007, Indian Hill Observatory, CVAS 40.0cm f/7 Newtonian Reflector, SBIG ST-7XME w/C filter, exposure 5.0s, Observer: Robert J. Modic.

Asteroid 391 Ingeborg (occultation near-miss)  August 13, 2007, Indian Hill Observatory, CVAS 40.0cm f/7 Newtonian Reflector,
SBIG ST-7XME w/V filter, exposure 20.0s, Observer: Robert J. Modic.

Peer Reviewed Papers

Astrometry of Iapetus, Ariel, Umbriel, and Titania from Eclipses and Occultations
Authors include A. Mallama and R. Modic, CVAS members. Abstract: Icarus (2009) Vol 200, 265-270

Assessment of the Resonant Perturbations Errors in Galilean Satellite Ephemerides Using Precisely Measured Eclipse Times
Authors include A. Mallama and B. Kroubsek, CVAS members. Abstract: Icarus (2010) Vol 210, 346-357

Rotation Period and H-G Parameters Determination for 1700 Zvezdara: A Collaborative Photometry Project
Authors include R. Baker, CVAS member. Minor Planet Bulletin (2010) Vol 37, 81-83

Photometry of Mercury from SOHO/LASCO and Earth. The Phase Function from 2 to 170 deg Icarus (2002) Vol 155, 253-264
Venus Phase Function and Forward Scattering from H2SO4 Icarus (2006) Vol 182, 10-22
The Magnitude and Albedo of Mars Icarus (2007) Vol 192, 404-416
Abstracts for papers on the phase curve characterization of Mercury, Venus and Mars by A. Mallama, CVAS member.

Characterization of Terrestral Exoplanets based on Phase Curves and Albedos of Mercury, Venus and Mars Icarus (2009) Vol 204, 11-14 Abstract to a paper appearing in Icarus on characterization of exo-planet phase curves by A. Mallama, CVAS member.