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IAUC 7153: N Sgr 1999; C/1999 H1

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                                                  Circular No. 7153
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
BMARSDEN@CFA.HARVARD.EDU or DGREEN@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)


NOVA SAGITTARII 1999
     Y. and R. Kushida, Yatsugatake South Base Observatory, report
the discovery by Minoru Yamamoto, Okazaki, Aichi, Japan, of a nova
(mag 8.6) on two TMax-400 films taken with a 200-mm f/4 camera lens
(+ PO-0 filter) on Apr. 25.731 UT.  No star is visible at this
location on 23 previous films taken by Yamamoto dating back to 1997
Feb. 19, the most recent from 1999 Apr. 11 (limiting mag 10.6).
The Kushidas provide the following precise position from an
unfiltered CCD image taken with a 0.4-m f/6.3 Schmidt-Cassegrain
reflector on Apr. 26.778, when the star appeared at mag 7.6:  R.A.
= 18h07m36s.22, Decl. = -27o20'13".5 (equinox 2000.0).  Nothing
obvious appears at this location on the Digital Sky Survey.
     W. Liller, Vina del Mar, Chile, writes:  "A low-resolution CCD
spectrogram of Yamamoto's new star obtained on Apr. 27.195 UT with
a 0.20-m Schmidt camera (+ objective prism) shows H-alpha weakly in
emission, about 20 percent brighter than the neighboring continuum,
indicating that it is a nova in the early stages of development.
On Apr. 27.18, its CCD magnitudes was V = 8.45 (B9 comparison star
SAO 186331, Tycho V = 8.58)."


COMET C/1999 H1 (LEE)
     Ephemeris extension to IAUC 7147 (elements on MPEC 1999-H33):

1999 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Apr. 22    12 17.66   -65 52.7   0.844   1.630  123.5   30.9    8.8
     24    11 45.55   -63 49.5   0.811   1.602  123.4   31.6    8.6
     26    11 16.54   -61 09.0   0.782   1.573  122.7   32.6    8.4
     28    10 51.15   -57 54.4   0.759   1.544  121.4   33.8    8.3
     30    10 29.40   -54 10.6   0.741   1.515  119.4   35.4    8.2
May   2    10 10.98   -50 03.6   0.728   1.486  116.9   37.2    8.0
      4     9 55.46   -45 40.0   0.721   1.458  113.9   39.2    7.9
      6     9 42.39   -41 06.7   0.720   1.429  110.4   41.4    7.8
      8     9 31.36   -36 30.3   0.725   1.400  106.5   43.7    7.8
     10     9 22.02   -31 56.8   0.735   1.371  102.5   46.0    7.7
     12     9 14.07   -27 31.1   0.750   1.342   98.3   48.1    7.7
     14     9 07.27   -23 16.9   0.770   1.313   94.1   50.1    7.6
     16     9 01.42   -19 16.8   0.794   1.284   89.9   51.9    7.6
     18     8 56.35   -15 32.0   0.822   1.256   85.8   53.4    7.6
     20     8 51.94   -12 03.1   0.852   1.227   81.9   54.7    7.5
     22     8 48.07   - 8 49.7   0.885   1.199   78.0   55.7    7.5

                      (C) Copyright 1999 CBAT
1999 April 27                  (7153)            Daniel W. E. Green

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