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IAUC 7323: N Aql 1999 No. 2; HD 209458; P/1999 V1

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                                                  Circular No. 7323
Central Bureau for Astronomical Telegrams
Mailstop 18, Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
IAUSUBS@CFA.HARVARD.EDU or FAX 617-495-7231 (subscriptions)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7244/7440/7444 (for emergency use only)

     Alfredo Pereira, Cabo da Roca, Portugal, reports his visual
discovery of an apparent nova during a search program with 14x100
binoculars on Dec. 1.785 UT at m_v about 6.0.  D. di Cicco,
Sudbury, MA, reports the following precise position from unfiltered
CCD frames taken around Dec. 1.95:  R.A. = 19h23m05s.38, Decl. =
+4 57'20".1 (equinox 2000.0; GSC reference stars), mag 5.2.  The
Digital Sky Survey reveals a star that has position end figures
05s.32, 19".6 (red mag 15.6, blue mag 17.4) in the USNO A2.0
catalogue.  Additional visual magnitude estimates:  Dec. 1.813, 5.8
(Pereira); 1.819, 5.9 (C. Vitorino, Cabo da Roca, Portugal); 1.842,
5.8 (Vitorino); 1.843, 5.8 (Pereira); 1.939, 5.1 (D. W. E. Green,
Cambridge, MA).

HD 209458
     E. Poretti, Brera Astronomical Observatory, writes: "Forty-six
V photoelectric measurements of HD 209458 obtained with the Merate
0.5-m telescope show that a transit (depth 0.016 +/- 0.002 mag)
started at Nov. 25.815 UT.  Observations began at Nov. 25.74, but
stopped at Nov. 25.91 due to large airmass, before egress.
Analysis of B photometry is in progress."
     Independent reports have been received from S. Soderhjelm, Lund
Observatory; and from N. Robichon and F. Arenou, DASGAL, Observatoire
de Paris, Meudon, of the existence of five HD 209458 transits in 89
separate Hipparcos photometric measurements obtained between 1991
Apr. 17 and Nov. 4.  Robichon and Arenou report that the mean depth
of the transits is 0.025 +/- 0.004 magnitude in the Hipparcos H_p
band, corresponding to a relative depth in the flux of 2.3 +/- 0.4
percent (results submitted to A.Ap.).  Using the epoch T_c of
Charbonneau et al. (submitted to Ap.J. Lett.; see also IAUC 7315),
periods of 3.524738 +/- 0.000015 (Robichon and Arenou) and 3.52473
+/- 0.00005 (Soderhjelm) days have been derived.  Soderhjelm's
details will appear on IBVS 4816.

     Orbital elements (MPC 36654) show this to be a short-period

     T = 1999 Oct. 22.1860 TT         Peri. = 185.9914
     e = 0.588712                     Node  = 294.4267  2000.0
     q = 2.961381 AU                  Incl. =  15.5816
       a =  7.200261 AU    n = 0.0510131    P =  19.321 years

                      (C) Copyright 1999 CBAT
1999 December 1                (7323)            Daniel W. E. Green

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