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IAUC 9130: V407 CYGNI; COMET P/2002 FA_9 = P/2010 F2 (LINEAR)

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                                                  Circular No. 9130
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
CBAT Director:  D. W. E. Green, Room 209; Department of
 Earth and Planetary Sciences; Harvard University;
 20 Oxford St.; Cambridge, MA  02138; U.S.A.
CBAT@IAU.ORG; CBATIAU@EPS.HARVARD.EDU
URL http://www.cfa.harvard.edu/iau/cbat.html  ISSN 0081-0304


V407 CYGNI
     The Bureau received reports by Japanese amateurs (K. Nishiyama
and F. Kabashima; T. Kojima; K. Sakaniwa; and A. Tago) of a
possible new 7th-mag nova in Cygnus on wide-field camera-lens CCD
images taken during Mar. 10.8-11.8 UT.  Nishiyama and Kabashima
suggested that this might be an unusually bright outburst of V407
Cyg (their astrometry yielding R.A. = 21h02m09s.83, Decl. =
+45o46'33".0, equinox 2000.0) -- not known to have been brighter
than mag 13 since its 1936 discovery; it had been classified as a
Mira variable with a symbiotic-star spectrum (e.g., Duerbeck 1987,
Space Sci. Rev. 45, 1).  Visual magnitude estimates by P. Schmeer,
Bischmisheim, Germany:  Mar. 12.184, 7.9; 17.183, 8.9; 18.191, 9.1.
U. Munari et al. report (CBET 2204) that spectra from Mar. 13.09
show the absorption spectrum of the Mira star that is completely
overwhelmed by the blue continuum from the outbursting component, a
scenario reminiscent of the symbiotic recurrent nova RS Oph; the
broad component of the Balmer emission series and He I lines looks
closely similar to the spectrum of He/N classical novae.
Additional details appear on CBET 2199, 2205, and 
2210.


COMET P/2002 FA_9 = P/2010 F2 (LINEAR)
     R. H. McNaught has rediscovered 2002 FA_9, an apparently
asteroidal object discovered by the LINEAR survey last year
(discovery observation, from MPS 55865, tabulated below), on CCD
images taken with the 0.5-m Uppsala Schmidt telescope (McNaught's
first observation from 2010 Mar. 20 is also tabulated below).
McNaught found a slightly diffuse 10" coma on the 20-s discovery
images in mediocre seeing; three stacked 60-s follow-up images
show a 16" coma extending to the north.  The orbit on MPO 30730
requires a correction of Delta(T) = -0.8 day.

  Date      UT             R.A. (2000) Decl.       Mag.   Observer
  2002 Mar. 16.31907   11 45 44.89   - 5 23 01.8   18.5   LINEAR
  2010 Mar. 20.60759   11 40 25.00   - 4 38 19.8   18.3   McNaught

The new astrometry, the following orbital elements, and an
ephemeris appear on MPEC 2010-F50.

                    Epoch = 2010 Mar. 25.0 TT
     T = 2010 Mar. 21.6348 TT         Peri. = 333.7142
     e = 0.313683                     Node  = 204.4870  2000.0
     q = 2.748317 AU                  Incl. =   8.8899
       a =  4.004446 AU    n = 0.1229958    P =   8.01 years
 
                      (C) Copyright 2010 CBAT
2010 March 18                  (9130)            Daniel W. E. Green

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