Binary asteroid IAU announcement telegram

(2500) ALASCATTALO
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; F. Pilcher, Organ Mesa Observatory, Las Cruces, NM, U.S.A.; A.
Marchini, R. Papini, and F. Salvaggio, Dipartimento di Scienze Fisiche, Della
Terra e Dell’Ambiente, University of Siena; J. Oey, Blue Mountains
Observatory, Leura, NSW, Australia; D. Pray, Sugarloaf Mountain Observatory,
South Deerfield, MA, U.S.A.; R. Durkee, Shed of Science South Observatory,
Pontotoc, TX, U.S.A.; W. Cooney, J. Gross, and D. Terrell, Sonoita Research
Observatory, Sonoita, AZ, U.S.A.; R. Goncalves, Linhaceira Observatory,
Tomar, Portugal; A. Aznar, Isaac Aznar Observatory, Alcublas, Valencia,
Spain; C. Odden, Phillips Academy, Andover, MA, U.S.A.; and J. Kemp,
Middlebury College, Middlebury, VT, U.S.A., report that photometric
observations taken with a 0.35-m telescope at the Sopot Observatory in Serbia,
a 0.35-m telescope at the Organ Mesa Observatory, a 0.30-m telescope at the
Astronomical Observatory of the University of Siena, a 0.35-m telescope at the
Blue Mountains Observatory, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.50-m telescope at the Shed of Science South Observatory, a
0.50-m telescope at the Sonoita Research Observatory, a 0.35-m telescope at
the Linhaceira Observatory, a 0.35-m telescope at the Isaac Aznar Observatory,
and a 0.50-m telescope at the Mittelman Observatories at New Mexico Skies
during Mar. 20-May 19 reveal that minor planet (2500) is a binary system
with an orbital period of 169.1 ± 0.3 hr. The primary shows a period of
2.75123 ± 0.00009 hr and has a lightcurve amplitude of 0.19 magnitude at
solar phases 2-17 degrees, suggesting a nearly spheroidal shape. Mutual
eclipse/occultation events that are 0.15 to 0.27 magnitude deep indicate a
secondary-to-primary mean-diameter ratio of 0.39 ± 0.02.

2020 June 7 (CBET 4791) Daniel W. E. Green [2020-06-08 06:24, Ondrejov]

Binary asteroid IAU announcement telegram

(1480) AUNUS
V. Benishek, Belgrade Astronomical Observatory; P. Pravec, Ondrejov
Observatory; J. Oey, Blue Mountains Observatory, Leura, NSW, Australia;
R. Durkee, Shed of Science South Observatory, Pontotoc, TX, U.S.A.; C. Odden,
Phillips Academy, Andover, MA, U.S.A.; W. Cooney, Starry Night Observatory,
Columbus, TX, U.S.A.; J. Kemp, Middlebury College, Middlebury, VT, U.S.A.;
D. Pray, Sugarloaf Mountain Observatory, South Deerfield, MA, U.S.A.; J.
Gross and D. Terrell, Sonoita Research Observatory, Sonoita, AZ, U.S.A.; and
A. Aznar, Isaac Aznar Observatory, Alcublas, Valencia, Spain, report that
photometric observations taken with a 0.35-m telescope at the Sopot
Observatory in Serbia, a 0.35-m telescope at the Blue Mountains Observatory,
a 0.50-m telescope at the Shed of Science South Observatory, a 0.50-m
telescope at the Phillips Academy Observatory, a 0.50-m telescope at the
Starry Night Observatory, a 0.50-m telescope at the Mittelman Observatories
at New Mexico Skies, a 0.50-m telescope at the Sugarloaf Mountain
Observatory, a 0.50-m telescope at the Sonoita Research Observatory, and a
0.35-m telescope at the Isaac Aznar Observatory during Mar. 21-May 19 reveal
that minor planet (1480) is a binary system with an orbital period of 19.714
± 0.003 hr. The primary shows a period of 5.1600 ± 0.0002 hr and has a
lightcurve amplitude of 0.16 magnitude at solar phases 2-18 degrees,
suggesting a nearly spheroidal shape. Mutual eclipse/occultation events that
are 0.09 to 0.20 magnitude deep indicate a lower limit on the secondary-to-
primary mean-diameter ratio of 0.30.