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IAUC 5265: 1991 JR; N Her 1991

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IAUC number 

                                                  Circular No. 5265
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


1991 JR
     Ephemeris continuation from IAUC 5264:

     1991 ET      R.A. (1950) Decl.     Delta      r       V
     May  20    16 51.36    -19 39.3    0.055    1.064    17.7
          21    16 57.84    -23 17.4
          22    17 05.12    -27 09.0    0.051    1.061    17.6
          23    17 13.33    -31 12.1
          24    17 22.63    -35 23.4    0.049    1.058    17.7
          25    17 33.24    -39 39.1
          26    17 45.37    -43 54.3    0.048    1.055    17.8
          27    17 59.30    -48 03.8
          28    18 15.33    -52 02.2    0.049    1.052    18.0
          29    18 33.76    -55 44.4
          30    18 54.87    -59 05.7    0.051    1.049    18.3
          31    19 18.86    -62 02.2
     June  1    19 45.69    -64 30.9    0.054    1.047    18.6
           2    20 15.05    -66 29.9
           3    20 46.21    -67 59.1    0.058    1.045    18.9


NOVA HERCULIS 1991
     E. M. Leibowitz, H. Mendelson, and E. Mashal, Tel Aviv University,
report:  "With the 1-m telescope of the Wise Observatory, we
observed Nova Her photoelectrically in the B and R bands on Apr. 6,
and with a CCD camera on Apr. 10, 11, 12, 13, 22, 25, 28, May 2, 4,
and 7, for 2.5-5.5 hr on each night.  We identify a local minimum,
0.15 mag deep, appearing periodically in the light curve of the
nova, with a cycle length of P = 71.424 +/- 0.002 hr, and epoch May
4.91950 +/- 0.00017 day.  The probability of finding such a period
in a random distribution of events is < 1 percent.  The period of
the system could also be P/2, P/4, or possibly (but less likely) P/7."
     H. Kosai, National Astronomical Observatory of Japan, reports
the following approximate limiting magnitudes from color film exposed
just prior to outburst (cf. IAUC 5226, 5230):  Mar. 23.75 UT,
[11: (A. Yonezawa, Osaka); 23.80, [9: (E. Ueta, Kobe).  Further
visual magnitude estimates (cf. IAUC 5254):  May 1.99 UT, 13.1 (O.
Midtskogen, Tranby, Norway); 5.01, 13.5 (B. H. Granslo, Fjellhamar,
Norway); 6.99, 13.5 (Midtskogen); 7.09, 14.5 (A. Mizser, Budapest,
Hungary).


1991 May 13                    (5265)             Daniel W. E. Green

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