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IAUC 5455: N Cyg 1992; N Pup 1991; 1991l

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                                                  Circular No. 5455
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN or GREEN@CFA.BITNET    MARSDEN or GREEN@CFAPS2.SPAN


NOVA CYGNI 1992
     H. Kosai, National Astronomical Observatory, Tokyo, forwards
the following report from O. Ohshima (note correction to spelling on
IAUC 5234), Kurashiki, Japan:  "Nova Cyg 1992 was observed by N.
Ohkura, Senoo, Okayama, using a 0.18-m refractor with a photon-
counting system, resulting in the following photometry and probable
errors on Feb. 20.85 UT:  V = 4.63 +/- 0.01, B-V = +0.34 +/- 0.02,
U-B = -0.39 +/- 0.04."
     Visual magnitude estimates (cf. IAUC 5454): Feb. 20.753 UT, 4.3
(P. Schmeer, Bischmisheim, Germany); 20.77, 4.5 (M. Taylor,
Wakefield, England); 20.83, 4.7 (Y. and R. Kushida, Yatsugatake South
Base Observatory, Japan); 21.267, 4.3 (G. Hurst, Basingstoke,
England); 21.44, 4.6 (P. Sventek, Houston, TX).


NOVA PUPPIS 1991
     Photometry by A. C. Gilmore with the 0.6-m Boller & Chivens
Cassegrain telescope at Mt. John University Observatory: Feb. 16.497
UT, V = 10.52 +/- 0.02, U-B = -0.53 +/- 0.05, B-V = +0.30 +/- 0.02.


COMET HELIN-LAWRENCE (1991l)
     Ephemeris extension from orbital elements on MPC 19654:

1992 TT     R. A. (2000) Decl.     Delta      r    Elong. Phase      m1
Feb. 18     0 54.73    -44 48.2    2.028    1.570   49.1   28.4     10.7
     23     1 00.90    -40 49.0    2.101    1.590   46.4   26.8     10.8
     28     1 06.49    -37 08.1    2.175    1.611   43.7   25.1     10.9
Mar.  4     1 11.66    -33 44.4    2.251    1.636   40.9   23.4     11.0
      9     1 16.50    -30 36.4    2.326    1.662   38.1   21.6     11.2
     14     1 21.07    -27 42.7    2.401    1.691   35.4   19.9     11.3
     19     1 25.42    -25 02.0    2.473    1.722   32.8   18.2     11.4
     24     1 29.58    -22 32.9    2.542    1.755   30.3   16.7     11.5
     29     1 33.58    -20 14.1    2.608    1.790   28.1   15.2     11.6

     Total visual magnitude estimates (cf. IAUC 5295):  1991 Dec. 9.62
UT, 12.0 (A. F. Jones, Nelson, New Zealand, 0.32-m reflector); 1992
Jan. 13.45, 13.3 (G. Garradd, Tamworth, N.S.W., 0.25-m reflector).


1992 February 21               (5455)             Daniel W. E. Green

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