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IAUC 5320: N Sgr 1991; FG Ser; P/MACHHOLZ

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IAUC number 

                                                  Circular No. 5320
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 SAGITTARII 1991
     R. L. Kingsburgh and J. English report:  "Spectrograms obtained
at the Siding Spring 2.3-m telescope (+ DBS + 1200 l/mm grating) on
Aug. 2.41 UT yield an expansion velocity of 4500 km/s, as judged by
half the full width at zero intensity (FWZI/2) of H-alpha.  Strong,
broad emission is also seen in He II 468.6-nm, whose FWZI/2 yields
an expansion velocity of 5900 km/s."
    Photometry by A. C. Gilmore, Mt. John University Observatory:
Aug. 2.515 UT, V = 10.23 +/- 0.01, U-B = -0.81 +/- 0.02, B-V = +0.02
+/- 0.01, V-R = +1.51 +/- 0.02, V-I = +1.71 +/- 0.05; Aug. 3.635,
10.55 +/- 0.01, -0.71 +/- 0.02, -0.05 +/- 0.01, +1.53 +/- 0.02,
+1.07 +/- 0.06.
     Further visual magnitude estimates (cf. IAUC 5315):  Aug. 1.156
UT, 9.4 (J. E. Bortle, Stormville, NY); 6.1, 10.9 (C. Scovil,
Stamford, CT); 6.140, 11.6 (Bortle).


FG SERPENTIS
     Corrigendum.  On IAUC 5318, lines 9-11, replace the sentence,
"The integrated fluxes of H I . . . forbidden lines' fluxes." with
"The integrated fluxes of H I, He I, and [O III] emission lines are
now 0.6, 0.4, and 0.7 of their respective non-eclipse values."


PERIODIC COMET MACHHOLZ
     Continuation to the ephemeris on IAUC 5302:

     1991 ET      R.A. (1950) Decl.     Delta      r       m1
     Aug. 12    12 17.58    +19 57.7    0.966    0.708    11.1
          14    12 35.33    +17 53.2
          16    12 51.66    +15 48.8    1.009    0.802    11.9
          18    13 06.67    +13 46.7
          20    13 20.47    +11 48.5    1.068    0.891    12.5
          22    13 33.16    + 9 55.4
          24    13 44.88    + 8 08.0    1.140    0.977    13.2
          26    13 55.70    + 6 26.5
          28    14 05.74    + 4 51.0    1.222    1.058    13.7
          30    14 15.08    + 3 21.4
     Sept. 1    14 23.80    + 1 57.5    1.311    1.136    14.3


1991 August 7                  (5320)             Daniel W. E. Green

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