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IAUC 5639: N Sgr 1992 No. 2; 1992q

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                                                  Circular No. 5639
Central Bureau for Astronomical Telegrams
INTERNATIONAL ASTRONOMICAL UNION
Postal Address: Central Bureau for Astronomical Telegrams
Smithsonian Astrophysical Observatory, Cambridge, MA 02138, U.S.A.
Telephone 617-495-7244/7440/7444 (for emergency use only)
TWX 710-320-6842 ASTROGRAM CAM     EASYLINK 62794505
MARSDEN@CFA or GREEN@CFA (.SPAN, .BITNET or .HARVARD.EDU)


NOVA SAGITTARII 1992 No. 2
     G. S. Rossano, R. J. Rudy, R. C. Puetter, and D. K. Lynch,
Space and Environment Technology Center, The Aerospace Corporation,
communicate:  "Near-infrared observations of N Sgr 1992 No. 2 have
been obtained using a cooled scanning germanium spectrometer with a
10" x 8" oval aperture on the 3-m Shane telescope of Lick Observatory.
Spectroscopic observations (range 0.75-1.35 microns, resolution
300-550) show that the near-infrared spectrum has changed
considerably since August.  The source excitation is now higher, as
evidenced by a significant increase in the strength of He II lines.
He I at 1083.0 nm has increased considerably and is now the
dominant line of the spectrum.  Neutral oxygen 844.6- and 1128.7-nm
features excited by the Lyman beta fluorescence mechanism are still
present.  Weak O I at 777.4 and 1316.4 nm is also detected.  Previously
observed lines of neutral nitrogen and carbon are now weak or
absent.  Several lines remain unidentified.  The nova was observed
on three nights over a 4-day interval on Oct. 7.2, 8.2, and 9.2 UT.
A 5-percent decrease in brightness was observed over this time
interval. A monochromatic magnitude of 9.4 at 1.25 microns was
observed on Oct. 9.2."


COMET HELIN-LAWRENCE (1992q)
     Orbital elements from MPC 20909:

                    Epoch = 1993 Apr.  3.0 TT
     T = 1993 Mar. 15.0512 TT         Peri. = 268.7932
     e = 0.965523                     Node  = 194.6696  2000.0
     q = 2.040011 AU                  Incl. = 106.8513

1992/93     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Oct. 25     0 33.13   -44 26.0   1.965   2.611  120.2   19.2   14.1
Nov.  4     0 09.22   -47 47.7   2.046   2.543  108.6   21.7   14.1
     14    23 47.64   -50 02.2   2.147   2.478   97.5   23.3   14.1
     24    23 30.02   -51 24.6   2.255   2.415   87.1   24.1   14.1
Dec.  4    23 17.13   -52 11.6   2.363   2.357   77.6   24.1   14.1
     14    23 08.95   -52 37.9   2.461   2.302   69.1   23.6   14.1
     24    23 05.06   -52 54.1   2.544   2.251   61.7   22.6   14.1
Jan.  3    23 04.97   -53 08.0   2.607   2.204   55.5   21.6   14.0
     13    23 08.16   -53 25.1   2.647   2.163   50.7   20.6   14.0
     23    23 14.31   -53 49.6   2.663   2.127   47.6   20.0   13.9


1992 October 19                (5639)            Daniel W. E. Green

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