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IAUC 4757: 1989j; RZ Leo; Z Cam; 1989e

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IAUC number 

                                                  Circular No. 4757
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


COMET SHOEMAKER-HOLT (1989j)
     Ephemeris from the orbital elements on IAUC 4756:

     1989 ET      R.A. (1950) Decl.     Delta      r       m1
     Mar.  5    10 48.46    +31 35.1    1.872    2.800    13.8
          10    10 44.94    +31 57.5
          15    10 41.77    +32 12.4    2.009    2.897    14.1
          20    10 39.05    +32 20.3
          25    10 36.82    +32 21.8    2.169    2.994    14.4
          30    10 35.11    +32 17.5
     Apr.  4    10 33.93    +32 08.1    2.348    3.092    14.8


RZ LEONIS
     This object is again in outburst (cf. IAUC 4504), as indicated
by the following visual magnitude estimates:  Mar. 10.64 UT, 13.6 (H.
Narumi, Ehime, Japan); 10.75, 13.2 (Narumi); 10.92, 13.4 (S. Korth,
Duesseldorf, W. Germany); 11.14, 12.8 (G. Dyck, N. Dartmouth, MA):
11.54, 13.7 (M. Iida, Nagano, Japan); 11.95, 13.8 (G. Hurst,
Basingstoke, England).


Z CAMELOPARDALIS
     This object seems to be again in a standstill phase, as indicated
by the following visual magnitude estimates:  Feb. 26.90 UT, 12.5 (P.
Schmeer, Bischmisheim, West Germany); Mar. 3.84, 11.6 (Schmeer); 6.09,
11.7 (Schmeer); 7.18, 11.8 (P. Sventek, Houston, TX); 8.08, 11.8 (R.
Hays, Worth, IL); 9.16, 11.9 (Hays); 11.14, 11.4 (G. Dyck, N. Dartmouth,
MA); 13.17, 11.8 (Sventek).  E. Waagen, AAVSO, notes that the last
standstill of Z Cam occurred in 1987 June and lasted about 15 months.


COMET SHOEMAKER (1989e)
     Total visual magnitude estimate (cf. IAUC 4732):  Feb. 6.95 UT,
13.1 (M. Amoretti, Sanremo, Italy, 0.35-m reflector); 8.96, 13.2
(Amoretti); 12.47, 13.3 (A. Hale, Las Cruces, NM, 0.41-m reflector);
13.29, 13.7 (J. E. Bortle, Stormville, NY, 0.50-m reflector).


1989 March 13                  (4757)             Daniel W. E. Green

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