Central Bureau for Astronomical Telegrams
IAUC 3310: HR Del; 1978m; NOTICE RE Tlgms
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Read IAUC 3311
Circular No. 3310
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
TWX 710-320-6842 ASTROGRAM CAM Telephone 617-864-5758
HR DELPHINI
J. B. Hutchings, Dominion Astrophysical Observatory, communicates:
"HR Del (Nova 1967) has been found to have a spectroscopic
orbit of period 0.170 day. The probable value of Incl. is about 45o.
Photometric and spectrophotometric observations related to the
period would be of interest. The spectrum does not show large
changes, but the He II, C III and Baimer lines behave differently."
COMET SEARGENT (1978m)
Extension of the ephemeris on IAUC 3301:
1978/79 ET R. A. (1950) Decl. Delta r m1
Dec. 28 0 47.96 -18 54.6
Jan. 7 0 54.78 -14 39.2 2.204 2.276 13.8
17 1 02.29 -11 07.3
27 1 10.30 - 8 07.0 2.770 2.564 14.8
Feb. 6 1 18.67 - 5 30.4
16 1 27.29 - 3 12.2 3.313 2.839 15.6
26 1 36.07 - 1 08.7
Mar. 8 1 44.93 + 0 42.6 3.809 3.103 16.3
m1 = 8.5 + 5 log Delta + 10 log r
Total visual magnitude estimate by V. F. de Assis Neto, Sao
Francisco de Oliveira, Brazil (10-cm reflector): Nov. 6.98 UT,
8.5; coma diameter 10'.0
NOTICE CONCERNING TELEGRAMS
Some contributors are still telexing material for the Central
Bureau to the telex number of the Smithsonian Astrophysical
Observatory. This causes delay and inconvenience. The TWX number
710-320-6842 (answerback ASTROGRAM CAM) should be used. Contrary
to the advice on IAUC 3231, it would be helpful if contributors
sending information by telegram or cablegram would not include the
words SMITHSONIAN OBSERVATORY in the address on their messages,
for messages so addressed are sometimes relayed to the Smithsonian
telex, even though the above TWX number may be clearly specified.
TWX 7103206842 ASTROGRAM CAM (USA) is sufficient; as an additional
precaution the number could be repeated, and the words CENTRAL BUREAU
FOR ASTRON, understood by the telegraph company, can be added.
1978 November 29 (3310) Brian G. Marsden
Read IAUC 3311
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