Central Bureau for Astronomical Telegrams
IAUC 2268: THE MASS OF CERES; RADIO EMISSION FROM INTERSTELLAR CH3N; 1970f
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Read IAUC 2269
Circular No. 2268
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Cable Address: SATELLITES, NEWYORK
Western Union: RAPID SATELLITE CAMBMASS
THE MASS OF CERES
Dr. J. Schubart, Astronomisches Rechen-Institut, writes: "The
two asteroids (1) Ceres and (2) Pallas closely represent a 1/1
commensurability case. Therefore, these small bodies have caused
observable effects in the mean longitudes of each other during the
more than 160 years of observation. Tests showed a chance to
determine a reliable value for the mass of Ceres from the observations
of Pallas. A first determination resulted from 47 normal
positions 1803-1910 (given by G. Struve, 1911, thesis, Berlin) and
from 27 additional positions 1927-1968. The computations started
from Duncombe's (1969, Astr. Pap. Washington, 20, part 2) excellent
new orbits for Ceres and Pallas. The result for the mass of Ceres
is (6.7 +/- 0.4) x 10**-10 solar masses. This indicates that the mean
density of Ceres is similar to that of Mercury and the earth."
RADIO EMISSION FROM INTERSTELLAR CYANOACETYLENE
Dr. B. E. Turner, National Radio Astronomy Observatory, reports:
"Cyanoacetylene (HC3N) has been detected in the galactic
radio source Sgr B2. The discovery was made on July 22 with the
140-foot (42.7-m) telescope at Green Bank. The line was found in
emission at a frequency of 9098 MHz (wavelength 3.3 cm), with a
strength of about 4 flux units. The emission is not linearly
polarized. Within the frequency uncertainty of the transition
(+/- 0.3 MHz), the HC3N line in Sgr B2 appears to have the same
radial velocity, +62 km/s, as the formaldehyde absorption. No
HC3N was detected in some twelve other galactic sources in which
the molecules OH, H20 and HCN have been detected. HCN was not
detected, however, in Sgr B2 (see IAUC 2251)."
COMET WHITE-ORTIZ-BOLELLI (1970f)
The following precise position has been obtained by
M. P. Candy, Perth Observatory, Bickley, from a plate taken with the
33-cm f/10 astrograph:
1970 UT R.A. (1950) Decl.
May 27.43819 5 29 55.50 +11 38 07.6
1970 July 27 (2268) Brian G. Marsden
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