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IAUC 5715: G272.2-3.2; 1992t

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IAUC number 

                                                  Circular No. 5715
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)


G272.2-3.2
     P. F. Winkler and G. J. Hanson, Middlebury College; and M. M.
Phillips, Cerro Tololo Interamerican Observatory, report:  "We have
obtained observations which show that the optical nebulosity near
the center of G272.2-3.2 (IAUC 5709) has characteristics typical of
supernova remnant filaments.  Emission-line CCD images from the
CTIO 0.6-m Schmidt telescope show a faint filament centered at R.A.
= 9h06m40s.4, Decl. = -52 06'42" (equinox J2000.0), about 1' north-
west of the x-ray center.  The images suggest that [S II] emission
(671.6, 673.1 nm) is greater than or approximately equal to that in
H-alpha, indicative of shock-heated material.  A spectrum of this
filament from the CTIO 1.5-m telescope indicates a [S II]/H-alpha
ratio about 1.4, and shows [N II] 658.3-nm and [O II] 732.5-nm
emission as well, all typical of SNRs.  Other nearby nebulosity
includes a small complex of brighter filaments 4' west (near R.A. =
9h06m12s.0, Decl. = -52 06'52"), and a faint filament 7' north and
west (at R.A. = 9h06m22s.0, Decl. = -52 00'51").  The image data
suggest [SII]/H-alpha ratios between 0.5 and 1.0 in the latter two
filaments, but no spectra have been obtained.  No diffuse emission
is evident in continuum images of the field."


PERIODIC COMET SWIFT-TUTTLE (1992t)
     Extension of the ephemeris on IAUC 5671:

1993 TT     R. A. (2000) Decl.   Delta     r    Elong. Phase    m1
Mar.  4    22 07.58   -47 02.1   2.229   1.634   42.0   24.0    9.4
      9    22 19.90   -49 01.1   2.223   1.694   46.2   25.0    9.7
     14    22 33.09   -51 01.8   2.214   1.754   50.2   25.8    9.9
     19    22 47.32   -53 04.3   2.205   1.814   54.3   26.5   10.1
     24    23 02.80   -55 08.3   2.195   1.874   58.3   26.9   10.3
     29    23 19.75   -57 13.3   2.186   1.935   62.2   27.2   10.5
Apr.  3    23 38.47   -59 18.2   2.179   1.995   66.1   27.3   10.7
      8    23 59.30   -61 21.3   2.174   2.055   69.8   27.2   10.9
     13     0 22.65   -63 20.6   2.172   2.116   73.4   27.0   11.1
     18     0 48.92   -65 13.3   2.174   2.175   76.7   26.7   11.2
     23     1 18.48   -66 56.2   2.181   2.235   79.8   26.3   11.4
     28     1 51.54   -68 25.2   2.194   2.295   82.7   25.8   11.6
May   3     2 27.95   -69 36.3   2.212   2.354   85.3   25.3   11.8
      8     3 07.1    -70 26.0   2.236   2.413   87.5   24.7   12.0
     13     3 47.8    -70 51.9   2.267   2.472   89.4   24.1   12.2


1993 February 25               (5715)            Daniel W. E. Green

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