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IAUC 7186: MARS; 1999bv

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                                                  Circular No. 7186
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)


MARS
     T. Encrenaz and E. Lellouch, DESPA, Paris Observatory; G.
Paubert, Institut de Radio-Astronomie Millimetrique (IRAM), Granada;
and S. Gulkis, Jet Propulsion Laboratory, report:  "On Apr. 25-28,
we detected a millimeter rotational transition of NO at frequency
250.436848 GHz in the atmosphere of Mars, using the IRAM 30-m
antenna at Pico Veleta, Spain.  This is, to our knowledge, the
first ground-based detection of a nitrogen-bearing species in the
Martian atmosphere.  The observed line position is found to be
within 30 kHz of the position predicted by the Submillimeter,
millimeter and microwave spectra catalog (Pickett et al. 1992, JPL
Tech. Publ. 80-23, revision 3).  The line is observed in emission,
and the line width corresponds to a Doppler-broadened line,
indicating that the line is formed in Mars' upper atmosphere.  The
line intensity appears, at first order, consistent with the
synthetic calculations of Encrenaz et al. (1995, Planet. Space Sci.
43, 1485), based on the NO vertical distribution inferred from the
Viking measurements."


SUPERNOVA 1999bv IN MCG +10-25-14
     G. J. Hill, McDonald Observatory, University of Texas, reports
on behalf of the Hobby-Eberly Telescope (HET) Low Resolution
Spectrograph (LRS) commissioning team (which also includes M. P.
Bergmann, D. A. Howell, J. C. Wheeler, P. J. MacQueen, J. A. Booth,
M. T. Adams, M. Eracleus, C. Tejada, F. Cobos, F. Garfias, J.
Cuervo, H. Nicklas, W. Mitsch, G. W. Wesley, P. S. Odoms, G.
Barczac, L. W. Ramsey, T. G. Barnes III, B. Roman, C. Nance, G.
Hill, T. Worthington):  "A low-resolution spectrogram (range 400-
1000 nm) of SN 1999bv was obtained on Apr. 21.37 UT with the
Marcario LRS, during first light commissioning of the instrument.
The broad emission features seen by Jha et al. (IAUC 7150) at 667,
600, 475, and 402 nm are confirmed, and we note that the broad
emission (FWHM 10 000 km/s) at 667 nm is consistent with slightly
blueshifted H-alpha emission in the rest frame of the supernova.
Such emission was also seen in SN 1993J, and is suspected to be an
indication of transition, or hybrid type-II/type-Ib/c events,
sometimes referred to as type IIb."
     Corrigendum.  On IAUC 7150, for  MGC  read  MCG

                      (C) Copyright 1999 CBAT
1999 June 4                    (7186)            Daniel W. E. Green

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