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IAUC 3573: PARENAGO 1644; P/SCHWASSMANN-WACHMANN 1; 1980i; 1980 WF

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IAUC number 

                                                  Circular No. 3573
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


PARENAGO 1644
     M. Gavin, Worcester Park, Surrey, England, writes that this
star (R.A. = 5h29m57s, Decl. =  -6o06'.4, equinox 1900.0) may be a flare-type
variable.  Five-minute exposures beginning on l980 Nov. 30.991
and Dec. 1.012 UT indicated fading from mv = 12.4 to 13.5 during
this interval; a further rise of ~ 0.5 mag in 4 min was detected on
1981 Jan. 4.84 UT.  The star is normally at mv ~ 13.5.


PERIODIC COMET SCHWASSMANN-WACHMANN 1
     C.-Y. Shao and G. Schwartz, Center for Astrophysics, report
that this comet was photographed at total mag 13 (l.5-m reflector)
on Feb. 10.29 UT.  A semicircular coma of diameter ~ 30" from p.a.
210o to 40o had its brightest sector near p.a. 50o.  An observation
a few nights earlier showed the comet at its normal mag 18-19. For
the current ephemeris see MPC 5328 or BAA Hbk. for 1981, p. 86.


PERIODIC COMET BORRELLY (1980i)
     Recent visual observations show that this comet (ephemeris MPC
5225; BAA Hbk. for 1981, p. 77) is particularly bright: Jan. 25.00
UT, m1 = 9.9 (J. Bortle, Stormville, NY, 20 x 80 bin.); 31.01, 9.8
(Bortle); Feb. 6.00, 9.5 (C. S. Morris, Harvard, MA, O.25-m refl.).


1980 WF
     The following ephemeris continuation is from an orbit, to appear
in the Mar. 1 MPCs, from observations 1980 Nov. 29-1981 Feb.
10.  There are indications of substantial variations in brightness.

     1981 ET     R. A. (1950) Decl.     Delta     r     Mag.
     Jan. 16     7 32.93    -18 15.3    0.160   1.111   16.5
          26     8 01.40    -17 31.0
     Feb.  5     8 22.22    -15 14.0    0.230   1.184   17.3
          15     8 38.58    -12 12.4
          25     8 52.79    - 9 03.1    0.334   1.289   18.2
     Mar.  7     9 06.19    - 6 09.1
          17     9 19.69    - 3 44.0    0.485   1.414   19.3
          27     9 33.60    - 1 53.3
     Apr.  6     9 47.97    - 0 36.2    0.686   1.548   20.3


1981 February 12               (3573)              Brian G. Marsden

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