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IAUC 7855: C/2002 F1; V838 Mon

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                                                  Circular No. 7855
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)
CBAT@CFA.HARVARD.EDU (science)
URL http://cfa-www.harvard.edu/iau/cbat.html  ISSN 0081-0304
Phone 617-495-7440/7244/7444 (for emergency use only)


COMET C/2002 F1 (UTSUNOMIYA)
     Preliminary parabolic orbital elements from MPEC 2002-F39:

     T = 2002 Apr. 23.460 TT          Peri. = 124.093
                                      Node  = 288.167   2000.0
     q = 0.45854 AU                   Incl. =  78.800

2002 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Mar. 17    21 37.90   + 3 55.9   1.659   0.979   32.5   33.1    9.5
     19    21 45.17   + 5 31.8   1.614   0.943   32.6   34.7    9.3
     21    21 52.92   + 7 12.8   1.570   0.907   32.6   36.3    9.1
     23    22 01.21   + 8 59.0   1.526   0.871   32.6   38.0    8.8
     25    22 10.11   +10 50.3   1.484   0.835   32.4   39.8    8.6
     27    22 19.71   +12 46.6   1.444   0.800   32.1   41.5    8.3
     29    22 30.10   +14 47.6   1.406   0.764   31.7   43.3    8.1
     31    22 41.40   +16 52.6   1.369   0.729   31.1   45.1    7.8
Apr.  2    22 53.72   +19 00.7   1.336   0.695   30.5   46.9    7.5
      4    23 07.19   +21 10.2   1.305   0.661   29.7   48.6    7.3
      6    23 21.94   +23 19.4   1.278   0.629   28.9   50.2    7.0


V838 MONOCEROTIS
     T. R. Geballe, Gemini Observatory; A. Evans, B. Smalley, and
V. H. Tyne, Keele University; and S. P. S. Eyres, University of
Central Lancashire, report J, H, and K spectroscopy of V838 Mon
from Mar. 9, obtained as on IAUC 7796:  "The previously reported
(IAUC 7796, 7829) deep CO absorption bands longward of 2.29 microns
are now in emission and consist of a strong and almost smooth
elevated 'plateau' on which are superimposed narrow absorptions at
the individual (**12)CO band heads, observable at least up to v =
8-6.  Weaker dips at the wavelengths of (**13)CO band heads also are
present.  The water bands previously reported (IAUC 7796) are no
longer apparent, and the strong absorption feature near 1.09
microns is much weaker.  There is now stronger Paschen-beta
emission at 1.282 microns than previously, and Brackett-gamma
(2.166 microns) is more weakly in absorption; we see Brackett lines
from gamma to 4-24, but with no significant changes in line
strengths compared with Jan. observations.  The P-Cyg profiles
previously reported on metal lines are now much less pronounced.
The overall flux level has increased by a factor of about 15 since
our last spectrum (IAUC 7796), but the 1-2.5-micron continuum is
still well approximated by an approximately 4000-K Planck function."

                      (C) Copyright 2002 CBAT
2002 March 21                  (7855)            Daniel W. E. Green

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